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Let $x$ and $y$ be positive real numbers such that $2x + 3y = 6.$ Find the minimum value of \[\frac{2}{x} + \frac{3}{y}.\]
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Let $a$, $b$, and $c$ be positive real numbers such that $a^2 + b^2 + c^2 = 1$. Find the minimum value of $\frac{1}{a} + \frac{1}{b} + \frac{1}{c}$.
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A five-digit number is formed by writing two digits to the right of the number 123. If the resulting number is divisible by 9, determine the number of possible combinations of the two added digits.
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Let $\alpha$ be a real number such that $\alpha > 2$ and \[\sum_{n=1}^{\infty} \frac{3n+2}{\alpha^n} = \frac{7}{3}.\]Find $\alpha$.
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Determine the value of $b$ such that $b^2\times \sqrt[3]{\frac{5^{12}}{b}} = 5^3$.
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The value of $\log_{10}{26483}$ is between the consecutive integers $x$ and $y$. Find $x+y$.
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Let $f(x)=2x+1$. Find the sum of all $x$ that satisfy the equation $f^{-1}(x)=f(x^{-1})$.
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The average of the numbers $x$ and $2x$ is $12$. Find the value of $x$.
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Find the number of four-digit palindromic numbers that are divisible by 9 and have a sum of digits less than 20.
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The sum of the squares of two positive integers is 193. The product of the two integers is 84. What is the sum of the two integers?
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Find the smallest two-digit prime number such that reversing the digits of the number produces a composite number.
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Determine $k$ such that the sum of the squares of the roots of the equation $$x^4 - 6kx^2 + k^3 = 0$$ is equal to 1800.
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Determine the number of non-congruent triangles with integer side lengths such that the sum of the side lengths is equal to 12 units. Note: Two triangles are congruent if one can be transformed into the other by a combination of translations, rotations, and reflections.
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Find a positive integer that is divisible by 24 and whose square root is a number between 9 and 9.2.
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Using only the digits 3, 4, and 5, how many positive six-digit integers can be made that are palindromes?
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What is the largest whole number $b$ such that the decimal number 62 can be expressed as the sum of $b$ consecutive whole numbers?
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Let $p(x)$ be a polynomial with integer coefficients that has exactly $5$ real roots, and its degree is the smallest possible. Determine the degree of $p(x)$.
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Let $Q$ be the product of the first $200$ positive even integers. Find the largest integer $m$ such that $Q$ is divisible by $2^m$.
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Find the smallest positive integer $n$ such that when its digits are reversed, the resulting number has exactly four distinct positive divisors.
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Determine the number of different natural numbers that can be obtained by adding or multiplying two different single-digit prime numbers.
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Given that $f(x) = x^3$, find $x$ such that $f(x) = f(f^{-1}(6)) + 1$.
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Given that $f$ and $g$ are polynomials, and that $h(x)=f(g(x))+g(x)$, determine the degree of $f(x)$ and the constant term of $g(x)$, given that the degree of $h(x)$ is $10$ and the degree of $g(x)$ is $5$, and that the constant term of $h(x)$ is $3$.
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Find the smallest positive integer $n$ such that the number of positive divisors of $n^3$ is equal to the number of positive divisors of $n^2+1$.
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Find the value of $m$ so that the lines with the given equations are perpendicular. \begin{align*} y &= 3x+7 \\ 2y+mx &= 5. \end{align*}
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What is the maximum number of points of tangency possible for three spheres of different sizes that can be drawn so that each one is tangent to the other two and all three are tangent to the same plane?
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Let $x$ be a positive real number such that $\cos^2 x, \sin x, 1- \cos x \sin^2 x$ are in geometric progression. Find $x$.
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Find all real numbers $a$, $b$, and $c$ such that $$\frac{a^{x^2}+b^{x^2}}{c^{x^2}+(ab)^{x^2}}=\frac{a+b}{c+ab}$$for all real numbers $x$. Note: This new problem requires a different approach than the original, as it involves finding values for multiple variables ($a$, $b$, and $c$) that satisfy an equation with a va...
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How many positive integers less than 80 have an odd number of positive divisors?
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Find the product of all positive integers less than 10 that are not prime.
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Determine the maximum number of triangles that can be formed by a set of 15 points in space, considering that a triangle can only be formed if the three points are non-collinear and have a distance of at most 5 units between each pair of points.
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Consider a cubic equation of the form $x^3 + ax^2 + bx + c = 0$. Determine the sum of all values of $a$ for which the equation has at least one real root that is a rational number.
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The sum of the proper divisors of a positive integer $N$ is equal to $N$ itself. What is the largest such integer less than 500?
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What is the smallest positive integer that can be expressed as the sum of a positive integral multiple of 23 and a positive prime integer, but not as the sum of a positive integral multiple of 17 and a positive prime integer?
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Let $x$ and $y$ be positive real numbers such that $x+y=1$. Find the maximum value of \[xy+\frac{1}{x^2}+\frac{1}{y^2}.\]
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Find the number of different positive integers that divide 30! and are not divisible by any perfect square greater than 1.
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The blue curve shown is the graph of the equation $y = ax^3 + bx^2 + cx + d$. Find $d$. (Assume that the graph has the standard unit scale.) [asy] size(150); real ticklen=3; real tickspace=2; real ticklength=0.1cm; real axisarrowsize=0.14cm; pen axispen=black+1.3bp; real vectorarrowsize=0.2cm; real tickdown=-0.5; rea...
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Determine all values of $n$ for which $2^n$ can be expressed in the form $3m+1$, where $m$ is an integer.
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Find the minimum integer value of $n$ for which the inequality $2^n < 3n + 1$ no longer holds.
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What is the product of all values of $a$ such that the equation $x^3-ax^2+2a=0$ has three distinct real roots that form an arithmetic progression?
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Find the sum of all positive integers $n$ such that $2n^2 - 6n + 1 < 15$.
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Evaluate the expression \[ \frac{a+2}{a+1} \cdot \frac{b-1}{b-2} \cdot \frac{c + 8}{c+6} , \] given that $c = b-10$, $b = a+2$, $a = 4$, and none of the denominators are zero.
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Determine the value of the constant $a$ such that the graph of $f(x) = \frac{x^2-4x+a}{x^2-4x+3}$ has no vertical asymptotes.
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How many three-digit numbers are such that the sum of their digits is divisible by 7 and the tens digit is twice as large as the hundreds digit?
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The mode of a set of consecutive even integers is 84. If the sum of the integers in the set is 756, what is the number of integers in the set?
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Find the positive integer $n$ such that \[\sin \left( \frac{\pi}{2n} \right) + \cos \left (\frac{\pi}{2n} \right) = \frac{\sqrt{n}}{2}.\] Write another problem inspired by this one: Find the positive integer $m$ such that \[\tan \left( \frac{\pi}{4m} \right) + \sec \left (\frac{\pi}{4m} \right) = m.\]
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Determine the values of the positive real number $a$ such that the inequality \[x \sqrt{a^2 - x^2} + \sqrt{a^2x^2 - x^4} > a^2\] holds for all $x$ from the interval $(0, a)$.
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A function $f$ is defined on the complex numbers by $f(z)=\frac{z}{a+bi}$, where $a$ and $b$ are positive numbers. This function has the property that for each complex number $z$, $f(z)$ is equidistant from both $z$ and the origin. Given that $|a+bi|=8$, find the value of $a^2+b^2$.
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Determine the smallest positive integer $a$ such that $a^2$ is divisible by 24 and $a^3$ is divisible by 36.
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Find the smallest positive integer $n$ such that the decimal expansion of $\frac{1}{n}$ has exactly three repeating digits, and these digits are consecutive integers (e.g., 0, 1, 2 or 4, 5, 6).
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Find the largest integer $n$ for which $20!$ evenly divides $12^n$.
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A $\textit{composite number}$ is a number that has two or more prime factors. The number 145 can be expressed as the sum of two composite numbers in many ways. What is the minimum positive difference between two such numbers?
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Let $T$ be a pyramid with triangular base $B$ and apex $A$ such that base $B$ is an equilateral triangle of side length 6, and the altitude of the pyramid is 8. Let $P$ be a point in the interior of the pyramid. Find the distance from $P$ to the nearest face of the pyramid, given that the volume of the pyramid with ape...
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A point $P$ is randomly chosen inside a triangle $ABC$. The distances from $P$ to the sides $AB$, $BC$, and $AC$ are $x$, $y$, and $z$, respectively. Given that the area of the triangle is 30 square units and $x+y+z=12$, find the length of the median from vertex $A$ to side $BC$.
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What value of $k$ will make $x^2 - 16x + k$ the square of a binomial? New Problem: Determine the value of $a$ such that the expression $x^2 + ax + 64$ can be factored as the product of two linear binomials, where the coefficients of the binomials are integers and the constant terms are equal.
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Given that the expression $\ds\frac{x^2-7x-30}{(x-6)(x+5)}$ takes positive values in some intervals of the real number line, let us define a function $f(n)$ that returns the number of different vectors $(a_1,a_2,\ldots,a_n)\in S_n$ ($S_n$ denotes the set of all permutations of $(1,2,\ldots,n)$) such that $f(a_1,a_2,\ld...
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In a triangle, the sum of the squares of the lengths of the three sides is equal to 360. If the length of the longest side is twice the length of the shortest side, find the length of the third side.
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Let $ABCD$ be a convex quadrilateral inscribed in a circle. The diagonals $AC$ and $BD$ intersect at $E$. Let $F$ be a point on segment $AE$ such that $\angle BFC = 90^\circ$. The sum of the lengths of the segments $BE$ and $DE$ is equal to the diameter of the circle. Find the smallest possible ratio of the lengths of ...
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Find all pairs $(a,b)$ of real numbers such that the matrix $$\begin{pmatrix}a&b\\-1&1\end{pmatrix}$$is orthogonal.
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Let $f(x)=x\ln{x}$, where $x$ is a positive real number. For each positive integer $n$, let $x_1,x_2,\ldots,x_n$ be positive real numbers such that $x_1x_2\cdots{x_n}=1$. Compute the minimum value of \[\sum_{i=1}^{n} f\left(x_i\right).\]
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Find the number of positive integers less than 30 that are relatively prime to 30.
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In the equations $y=a(x-h)^2+k$ and $y=b(x-h)^2+k$ determine $a$ and $b$ such that the two parabolas share the same vertex and exactly two points of intersection. Find $a-b$.
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Given that the graphs of $y=h(x)$ and $y=j(x)$ intersect at $(2,2),$ $(4,6),$ $(6,12),$ and $(8,12),$ there is one point where the graphs of $y=h(2x)$ and $y=2j(x)$ must intersect. What is the sum of the coordinates of that point?
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Determine the value of $x$ such that $\ds\sqrt[3]{x-3}+\ds\sqrt[3]{x-5}+\ds\sqrt[3]{x-7}=0$
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Let $f(x)$ and $g(x)$ be two functions that satisfy the equation: $$f(\arccos(g(x))) = \arctan(f(x))$$ for all real numbers $x$. If $f(0) = 0$ and $g(0) = 1$, find the value of $f'(0) \cdot g'(0)$.
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Consider a certain number, where all its digits are 3 except for one digit, which can be either 0 or 1. Find the sum of the digits of the smallest square number divisible by that number. (End of Response)
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In a circle, the radius is $r$ and the distance between two points $A$ and $B$ on the circle is $k$. What is the number of possible values of $k$ for which there are exactly two distinct points $C$ on the circle such that $\triangle ABC$ is an isosceles triangle?
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Find the sum of the values of $y$ that satisfy the equation $|2y|+5=17$.
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Given the polynomial $ax^{2} + bx + c$, determine the value of $x$ such that the sum of the coefficients $a$, $b$, and $c$ equals the value of the polynomial when evaluated at $x$.
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Given two polynomials $P(x)$ and $Q(x)$ with real coefficients, where $P(x)=x^2+3x-2$ and $Q(x)=x^3-x^2-2x+1$, find the sum of the squares of the roots of the polynomial $P(Q(x))$.
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A palindromic number is a number that remains the same when its digits are reversed. For example, 121 and 34543 are palindromic numbers. A palindromic composite number is a palindromic number that is not prime. What is the sum of all palindromic composite numbers less than 100?
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Let $a$ and $b$ be real numbers. Find the value of $|a+bi|+|a-bi|$ given that $a^2+b^2=1$.
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Let $S$ be the set of all nonzero real numbers. Let $f : S \to S$ be a function such that \[f(x) + f(y) = f(xyf(x + y))\]for all $x,$ $y \in S$ such that $x + y \neq 0.$ Let $n$ be the number of possible values of $f(4),$ and let $s$ be the sum of all possible values of $f(4).$ Find $n \times s.$
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Determine the value of $x$ such that $f(x)=0$, given that $f(x) = 2x^4-17x^3+26x^2-24x-60$.
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A square and four congruent circles each have their centers located at the center of the square. The circles overlap each other and the square in such a way that the side length of the square is equal to the diameter of each circle. What is the area of the region of the square that is not covered by the circles, in ter...
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The product of the digits of the decimal representation of $(3 \times 7)^{1003} \times (2 \times 5)^{1001}$ equals the sum of the squares of the digits of this product. What is the value of this product?
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Find the largest value of $c$ such that $1$ is in the range of $f(x)=x^2-5x+c$.
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Three circles are drawn such that each circle intersects the other two in exactly two points. The sum of the radii of each pair of circles is 15, 20, and 25 units. What is the sum of the areas of the three circles?
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In a circle of radius 5, a chord of length 6 is drawn. The circle is then divided into two regions by the chord. In each region, a point is chosen at random, and the distance between the two points is measured. What is the probability that the distance between the two points is greater than the length of the chord?
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How many odd four-digit numbers are there such that the sum of the hundreds and thousands digits is 9?
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The functions $f$ and $g$ are defined by $f(x) = 3x^3 + 2x^2 - x + 1$ and $g(x) = f(a + x) - f(a)$, where $a$ is a real number. Determine the sum of all possible values of $a$ for which the ratio of the sum of the real roots of $f(x)$ to the sum of the real roots of $g(x)$ is equal to 2.
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In a circle with radius 12, a chord subtends an angle of 60 degrees at the center. Find the area of the sector enclosed by the chord and the two radii that bisect the angle.
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Find the number of distinct possible values for the product of the greatest common divisor and least common multiple of two positive integers if the sum of their squares is 245.
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Find the sum of the squares of the first 10 odd positive integers.
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The area between two concentric circles is divided into four congruent regions by two perpendicular diameters. Determine the ratio between the radii of the circles if one of the regions has an area equal to half the area of the smaller circle.
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How many distinct arrangements of the letters in the word "babies" are there, given that the first letter must be a vowel and the last letter must be a consonant?
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Consider a sequence of positive integers $a_1$, $a_2$, ..., where $a_{n+2} = a_{n+1} + a_n$ for all positive integers $n$. Suppose that the sequence ends when it reaches a term that is divisible by 100. Find the maximum possible length of such a sequence.
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Find the smallest positive integer $n$ such that the sum of the squares of its proper divisors is greater than $n$ itself.
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Let $P$ be a point inside triangle $ABC$ such that $PA=2000$, $PB=2001$ and $PC=2002$. How many triangles can be formed with side lengths that are consecutive integers if $PA$, $PB$, and $PC$ are the sides of a triangle and $PA$ is the shortest side?
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Let $S$ be the set of all positive integer solutions to the equation $x^2+3x-5=0$. Let $T$ be the set of all positive integer solutions to the equation $x^2+3x-6=0$. Find the sum of all elements in the set $S \cap T$.
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Determine the largest constant $c$ such that for all real numbers $x$ the inequality $$\sqrt {x^2+x\sin x+\cos^2x}+\sqrt {x^2+x\cos x+\sin^2x}\ge cx$$ is fulfilled.
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The sides of rectangle $ABCD$ have lengths $10$ and $11$. An equilateral triangle is drawn so that no point of the triangle lies outside $ABCD$. Find the maximum possible area of such a triangle. New Problem: A circle is inscribed in a regular hexagon with side length $12$. Find the maximum area of a rectangle that ...
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Find the smallest positive integer $n$ such that $\lceil\sqrt{n}\rceil-\lfloor\sqrt{n}\rfloor=1$.
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In a rhombus $ABCD$, the diagonals $AC$ and $BD$ have lengths of $6$ units and $8$ units, respectively. The diagonals intersect at a point $E$, such that $\angle BEC = 45^\circ$. Find the area of the quadrilateral $AEBD$.
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Find the area of the triangle with vertices $(6,5,3),$ $(3,3,1),$ and $(15,11,9).$
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Find the smallest positive real number $c,$ such that for all nonnegative real numbers $x$ and $y,$ \[\sqrt{xy} + c |x - y| \ge \frac{x + y}{2}.\]
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A five-digit integer is divisible by 7 if the sum of its digits in the even positions minus the sum of the digits in the odd positions is divisible by 7. What is the smallest five-digit integer divisible by 7 that has exactly two identical digits?
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Find the value of $\frac{1}{a+1}+\frac{1}{b+1}+\frac{1}{c+1}$ if $a$, $b$, and $c$ are the solutions of the system of equations $x+y+z=3$, $x^2+y^2+z^2=3$, and $x^3+y^3+z^3=3$.
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If the quadratic $x^2+4mx+m$ has exactly one real root, find the positive value of $m$.
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Find the set of all possible values of $a$ for which the function $f(x) = \sqrt{ax^2+bx+c}$ has real values for all real $x$.
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Find the minimum value of $9^x - 3^x + 1$ over all real numbers $x.$
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