
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
**[b]p1.**[/b] Find the perimeter of a regular hexagon with apothem  $3$ .**p2.** Concentric circles of radius  $1$  and r are drawn on a circular dartboard of radius  $5$ . The probability that a randomly thrown dart lands between the two circles is  $0.12$ . Find  $r$ .**p3.** Find all ordered pairs of integers  $(x, y)$  with  $0 \le x \le 100$ ,   $0 \le y \le 100$  satisfying   $$ xy = (x - 22) (y + 15) . $$  **p4.** Points  $A_1$ , $A_2$ , $...$ , $A_{12}$  are evenly spaced around a circle of radius  $1$ , but not necessarily in order. Given that chords  $A_1A_2$ ,  $A_3A_4$ , and  $A_5A_6$  have length  $2$  and chords  $A_7A_8$  and  $A_9A_{10}$  have length  $2 sin (\pi / 12)$ , find all possible lengths for chord  $A_{11}A_{12}$ .**p5.** Let  $a$  be the number of digits of  $2^{1998}$ , and let  $b$  be the number of digits in  $5^{1998}$ . Find  $a + b$ .**p6.** Find the volume of the solid in  $R^3$  defined by the equations  $$ x^2 + y^2 \le 2 $$    $$ x + y + |z| \le 3. $$  **p7.** Positive integer  $n$  is such that  $3n$  has  $28$  positive divisors and  $4n$  has  $36$  positive divisors. Find the number of positive divisors of  $n$ .**p8.** Define functions  $f$  and  $g$  by  $f (x) = x +\sqrt{x}$  and  $g (x) = x + 1/4$ . Compute   $$ g(f(g(f(g(f(g(f(3)))))))). $$  (Your answer must be in the form  $a + b \sqrt{ c}$  where  $a$ ,  $b$ , and  $c$  are rational.)**p9.** Sequence  $(a_1, a_2,...)$  is defined recursively by  $a_1 = 0$ ,  $a_2 = 100$ , and  $a_n = 2a_{n-1}-a_{n-2}-3$ . Find the greatest term in the sequence  $(a_1, a_2,...)$ .**p10.** Points  $X = (3/5, 0)$  and  $Y = (0, 4/5)$  are located on a Cartesian coordinate system. Consider all line segments which (like  $\overline{XY}$  ) are of length 1 and have one endpoint on each axis. Find the coordinates of the unique point  $P$  on  $\overline{XY}$  such that none of these line segments (except  $\overline{XY}$  itself) pass through  $P$ .


PS. You had better use hide for answers. Collected [here](https://artofproblemsolving.com/community/c5h2760506p24143309).

Present the answer in LaTex format: \boxed{Your answer}
user