subject
stringclasses 7
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4.31k
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5
| answer
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159
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|---|---|---|---|
Intermediate Algebra
|
The coefficients of the polynomial
\[a_{10} x^{10} + a_9 x^9 + a_8 x^8 + \dots + a_2 x^2 + a_1 x + a_0 = 0\]are all integers, and its roots $r_1,$ $r_2,$ $\dots,$ $r_{10}$ are all integers. Furthermore, the roots of the polynomial
\[a_0 x^{10} + a_1 x^9 + a_2 x^8 + \dots + a_8 x^2 + a_9 x + a_{10} = 0\]are also $r_1,$ $r_2,$ $\dots,$ $r_{10}.$ Find the number of possible multisets $S = \{r_1, r_2, \dots, r_{10}\}.$
(A multiset, unlike a set, can contain multiple elements. For example, $\{-2, -2, 5, 5, 5\}$ and $\{5, -2, 5, 5, -2\}$ are the same multiset, but both are different from $\{-2, 5, 5, 5\}.$ And as usual, $a_{10} \neq 0$ and $a_0 \neq 0.$)
| 5 |
11
|
Algebra
|
Solve for $x$: $\left(\frac{1}{4}\right)^{2x+8} = (16)^{2x+5}$.
| 4 |
-3
|
Intermediate Algebra
|
The graph of \[\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1\]has its foci at $(0,\pm 4),$ while the graph of \[\frac{x^2}{a^2}-\frac{y^2}{b^2} = 1\]has its foci at $(\pm 6,0).$ Compute the value of $|ab|.$
| 4 |
2 \sqrt{65}
|
Geometry
|
Point $P$ is inside equilateral $\triangle ABC$. Points $Q$, $R$, and $S$ are the feet of the perpendiculars from $P$ to $\overline{AB}$, $\overline{BC}$, and $\overline{CA}$, respectively. Given that $PQ=1$, $PR=2$, and $PS=3$, what is $AB$ in terms of radicals?
| 5 |
4\sqrt{3}
|
Number Theory
|
Find the integer $n$, $4 \le n \le 8$, such that \[n \equiv 7882 \pmod{5}.\]
| 3 |
7
|
Geometry
|
If $a$, $b$, and $c$ are consecutive integers, find the area of the shaded region in the square below: [asy]
size(1.75inch);
pair A, B, C, D, W, X, Y, Z;
A = (0,0); B = (7,0); C = (7,7); D = (0,7);
W = (3,0); X = (7,3); Y = (4,7); Z = (0,4);
draw(A--B--C--D--cycle); draw(W--X--Y--Z--cycle);
fill(A--W--Z--cycle, gray); fill(B--X--W--cycle, gray); fill(C--Y--X--cycle, gray); fill(D--Z--Y--cycle, gray);
label("$a$", A--W); label("$b$", W--B); label("$a$", B--X); label("$b$", X--C);
label("$a$", C--Y); label("$b$", Y--D); label("$a$", D--Z); label("$b$", Z--A);
label("$c$", W--X, NW); label("$c$", X--Y, SW); label("$c$", Y--Z, SE); label("$c$", Z--W, NE);
[/asy]
| 3 |
24
|
Precalculus
|
One line is described by
\[\begin{pmatrix} -1 \\ -3 \\ -5 \end{pmatrix} + t \begin{pmatrix} 3 \\ k \\ 7 \end{pmatrix}.\]Another line is described by
\[\begin{pmatrix} 2 \\ 4 \\ 6 \end{pmatrix} + u \begin{pmatrix} 1 \\ 4 \\ 7 \end{pmatrix}.\]Find $k$ so that the lines are coplanar (i.e. there is a plane that contains both lines).
| 3 |
5
|
Precalculus
|
There are real numbers $a$ and $b$ such that for every positive number $x$, we have the identity
\[
\tan^{-1} \left( \frac{1}{x} - \frac{x}{8} \right) + \tan^{-1}(ax) + \tan^{-1}(bx)
= \frac{\pi}{2} \, .
\](Throughout this equation, $\tan^{-1}$ means the inverse tangent function, sometimes written $\arctan$.) What is the value of $a^2 + b^2$?
| 5 |
\frac{3}{4}
|
Intermediate Algebra
|
Compute
\[\frac{1}{2^3 - 2} + \frac{1}{3^3 - 3} + \frac{1}{4^3 - 4} + \dots + \frac{1}{100^3 - 100}.\]
| 5 |
\frac{5049}{20200}
|
Prealgebra
|
A sheet of 8-inch by 10-inch paper is placed on top of a sheet of $8 \frac{1}{2}$-inch by 11-inch paper, as shown. What is the area of the region of overlap in square inches?
[asy]draw((0,0)--(10,0)--(10,8)--(0,8)--(0,0)--cycle,linewidth(2));
draw((0,8)--(8.5,8)--(8.5,11.5)--(0,11.5)--(0,8)--cycle,linewidth(2));
draw((8.5,0)--(8.5,8),dashed);
[/asy]
| 5 |
68
|
Geometry
|
In trapezoid $ABCD$, leg $\overline{BC}$ is perpendicular to bases $\overline{AB}$ and $\overline{CD}$, and diagonals $\overline{AC}$ and $\overline{BD}$ are perpendicular. Given that $AB=\sqrt{11}$ and $AD=\sqrt{1001}$, find $BC^2$.
| 5 |
110
|
Intermediate Algebra
|
Let $a,$ $b,$ $c$ be positive real numbers such that $a + b + c = 1.$ Find the minimum value of $a^2 + 2b^2 + c^2.$
| 4 |
\frac{2}{5}
|
Algebra
|
What is the coefficient of $x^3$ when $$24x^4 + 6x^3 + 4x^2-7x - 5$$is multiplied by $$6x^3 + 3x^2 + 3x + 4$$and the like terms are combined?
| 4 |
-15
|
Algebra
|
If $\left\lfloor n^2/4 \right\rfloor - \lfloor n/2 \rfloor^2 = 2$, then find all integer values of $n$.
| 5 |
5
|
Geometry
|
The diagonals of rectangle $PQRS$ intersect at point $X$. If $PS = 6$ and $RS=8$, then what is $\sin \angle PXS$?
| 5 |
\frac{24}{25}
|
Geometry
|
There are two concentric spheres of radii 3 units and 6 units. What is the volume, in cubic units, of the region within the larger sphere and not within the smaller sphere? Express your answer in terms of $\pi$.
| 3 |
252\pi
|
Counting & Probability
|
If three coins are tossed at the same time, what is the probability of getting two tails and one head? Express your answer as a common fraction.
| 3 |
\frac{3}{8}
|
Counting & Probability
|
If the odds for pulling a prize out of the box are $3:4$, what is the probability of not pulling the prize out of the box? Express your answer as a common fraction.
| 3 |
\frac{4}{7}
|
Intermediate Algebra
|
Let $S$ denote the value of the sum\[\sum_{n=0}^{668} (-1)^{n} {2004 \choose 3n}\]Determine the remainder obtained when $S$ is divided by $1000$.
| 5 |
6
|
Prealgebra
|
How many numbers in the list $43$, $4343$, $434343$, $\dots$, are prime?
| 3 |
1
|
Geometry
|
Triangle $ABC$ has side lengths $AB=120,BC=220$, and $AC=180$. Lines $\ell_A,\ell_B$, and $\ell_C$ are drawn parallel to $\overline{BC},\overline{AC}$, and $\overline{AB}$, respectively, such that the intersections of $\ell_A,\ell_B$, and $\ell_C$ with the interior of $\triangle ABC$ are segments of lengths $55,45$, and $15$, respectively. Find the perimeter of the triangle whose sides lie on lines $\ell_A,\ell_B$, and $\ell_C$.
| 5 |
715
|
Prealgebra
|
A car travels 40 kph for 20 kilometers, 50 kph for 25 kilometers, 60 kph for 45 minutes and 48 kph for 15 minutes. What is the average speed of the car, in kph?
| 5 |
51
|
Number Theory
|
What is the largest $n$ such that $a = 2^{306} \cdot 3^{340}$ is a perfect $n$th power?
| 5 |
34
|
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