[b]p1.[/b] Given $x + y = 7$, find the value of x that minimizes $4x^2 + 12xy + 9y^2$.


[b]p2.[/b] There are real numbers $b$ and $c$ such that the only $x$-intercept of $8y = x^2 + bx + c$ equals its $y$-intercept. Compute $b + c$.



[b]p3.[/b] Consider the set of $5$ digit numbers $ABCDE$ (with $A \ne 0$) such that $A+B = C$, $B+C = D$, and $C + D = E$. What’s the size of this set?


[b]p4.[/b] Let $D$ be the midpoint of $BC$ in $\vartriangle ABC$. A line perpendicular to D intersects $AB$ at $E$. If the area of $\vartriangle ABC$ is four times that of the area of $\vartriangle BDE$, what is $\angle ACB$ in degrees?


[b]p5.[/b] Define the sequence $c_0, c_1, ...$ with $c_0 = 2$ and $c_k = 8c_{k-1} + 5$ for $k > 0$. Find $\lim_{k \to \infty} \frac{c_k}{8^k}$.


[b]p6.[/b] Find the maximum possible value of $|\sqrt{n^2 + 4n + 5} - \sqrt{n^2 + 2n + 5}|$.


[b]p7.[/b] Let $f(x) = \sin^8 (x) + \cos^8(x) + \frac38 \sin^4 (2x)$. Let $f^{(n)}$ (x) be the $n$th derivative of $f$. What is the largest integer $a$ such that $2^a$ divides $f^{(2020)}(15^o)$?


[b]p8.[/b] Let $R^n$ be the set of vectors $(x_1, x_2, ..., x_n)$ where $x_1, x_2,..., x_n$ are all real numbers. Let $||(x_1, . . . , x_n)||$ denote $\sqrt{x^2_1 +... + x^2_n}$. Let $S$ be the set in $R^9$ given by $$S = \{(x, y, z) : x, y, z \in R^3 , 1 = ||x|| = ||y - x|| = ||z -y||\}.$$ If a point $(x, y, z)$ is uniformly at random from $S$, what is $E[||z||^2]$?


[b]p9.[/b] Let $f(x)$ be the unique integer between $0$ and $x - 1$, inclusive, that is equivalent modulo $x$ to $\left( \sum^2_{i=0} {{x-1} \choose i} ((x - 1 - i)! + i!) \right)$. Let $S$ be the set of primes between $3$ and $30$, inclusive. Find $\sum_{x\in S}^{f(x)}$.


[b]p10.[/b] In the Cartesian plane, consider a box with vertices $(0, 0)$,$\left( \frac{22}{7}, 0\right)$,$(0, 24)$,$\left( \frac{22}{7}, 4\right)$. We pick an integer $a$ between $1$ and $24$, inclusive, uniformly at random. We shoot a puck from $(0, 0)$ in the direction of $\left( \frac{22}{7}, a\right)$ and the puck bounces perfectly around the box (angle in equals angle out, no friction) until it hits one of the four vertices of the box. What is the expected number of times it will hit an edge or vertex of the box, including both when it starts at $(0, 0)$ and when it ends at some vertex of the box?


[b]p11.[/b] Sarah is buying school supplies and she has $\$2019$. She can only buy full packs of each of the following items. A pack of pens is $\$4$, a pack of pencils is $\$3$, and any type of notebook or stapler is $\$1$. Sarah buys at least $1$ pack of pencils. She will either buy $1$ stapler or no stapler. She will buy at most $3$ college-ruled notebooks and at most $2$ graph paper notebooks. How many ways can she buy school supplies?


[b]p12.[/b] Let $O$ be the center of the circumcircle of right triangle $ABC$ with $\angle ACB = 90^o$. Let $M$ be the midpoint of minor arc $AC$ and let $N$ be a point on line $BC$ such that $MN \perp BC$. Let $P$ be the intersection of line $AN$ and the Circle $O$ and let $Q$ be the intersection of line $BP$ and $MN$. If $QN = 2$ and $BN = 8$, compute the radius of the Circle $O$.


[b]p13.[/b] Reduce the following expression to a simplified rational $$\frac{1}{1 - \cos \frac{\pi}{9}}+\frac{1}{1 - \cos \frac{5 \pi}{9}}+\frac{1}{1 - \cos \frac{7 \pi}{9}}$$


[b]p14.[/b] Compute the following integral $\int_0^{\infty} \log (1 + e^{-t})dt$.


[b]p15.[/b] Define $f(n)$ to be the maximum possible least-common-multiple of any sequence of positive integers which sum to $n$. Find the sum of all possible odd $f(n)$


PS. You should use hide for answers. Collected [url=https://artofproblemsolving.com/community/c5h2760506p24143309]here[/url].
To solve the problem, we need to find the number of 5-digit numbers \(ABCDE\) such that the following conditions hold:
1. \(A \neq 0\)
2. \(A + B = C\)
3. \(B + C = D\)
4. \(C + D = E\)

Let's start by expressing \(D\) and \(E\) in terms of \(A\) and \(B\):

1. From \(A + B = C\), we have:
   \[
   C = A + B
   \]

2. From \(B + C = D\), substituting \(C\) from the previous equation, we get:
   \[
   D = B + (A + B) = A + 2B
   \]

3. From \(C + D = E\), substituting \(C\) and \(D\) from the previous equations, we get:
   \[
   E = (A + B) + (A + 2B) = 2A + 3B
   \]

Now, we need to find all possible pairs \((A, B)\) such that \(A\) and \(B\) are digits (i.e., integers from 0 to 9) and \(A \neq 0\).

Since \(A\) must be a non-zero digit, \(A\) can take any value from 1 to 9. However, we also need to ensure that \(C\), \(D\), and \(E\) are valid digits (i.e., between 0 and 9).

Let's analyze the constraints:
- \(C = A + B\) must be a digit, so \(0 \leq A + B \leq 9\).
- \(D = A + 2B\) must be a digit, so \(0 \leq A + 2B \leq 9\).
- \(E = 2A + 3B\) must be a digit, so \(0 \leq 2A + 3B \leq 9\).

We will now check each possible value of \(A\) and find the corresponding values of \(B\) that satisfy all the constraints:

1. \(A = 1\):
   - \(1 + B \leq 9 \implies B \leq 8\)
   - \(1 + 2B \leq 9 \implies 2B \leq 8 \implies B \leq 4\)
   - \(2 \cdot 1 + 3B \leq 9 \implies 3B \leq 7 \implies B \leq 2\)
   - Possible values of \(B\): \(0, 1, 2\)

2. \(A = 2\):
   - \(2 + B \leq 9 \implies B \leq 7\)
   - \(2 + 2B \leq 9 \implies 2B \leq 7 \implies B \leq 3\)
   - \(2 \cdot 2 + 3B \leq 9 \implies 3B \leq 5 \implies B \leq 1\)
   - Possible values of \(B\): \(0, 1\)

3. \(A = 3\):
   - \(3 + B \leq 9 \implies B \leq 6\)
   - \(3 + 2B \leq 9 \implies 2B \leq 6 \implies B \leq 3\)
   - \(2 \cdot 3 + 3B \leq 9 \implies 3B \leq 3 \implies B \leq 1\)
   - Possible values of \(B\): \(0\)

4. \(A = 4\):
   - \(4 + B \leq 9 \implies B \leq 5\)
   - \(4 + 2B \leq 9 \implies 2B \leq 5 \implies B \leq 2\)
   - \(2 \cdot 4 + 3B \leq 9 \implies 3B \leq 1 \implies B \leq 0\)
   - Possible values of \(B\): None

5. \(A = 5\) to \(A = 9\):
   - For these values of \(A\), \(2A + 3B\) will always exceed 9 for any non-negative \(B\), so there are no valid pairs.

Summarizing the valid pairs \((A, B)\):
- \((1, 0), (1, 1), (1, 2)\)
- \((2, 0), (2, 1)\)
- \((3, 0)\)

Thus, there are 6 valid pairs \((A, B)\) that satisfy all the conditions.

The final answer is \(\boxed{6}\)