Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

[Q]: Problem: if ( 2 ^ 16 ) ( 25 ^ s ) = 5 ( 10 ^ m ) what is the value of m ?
Options: a. 7, b. 8, c. 15, d. 16, e. 23
[A]: d


[Q]: Problem: maxwell leaves his home and walks toward brad ' s house. one hour later, brad leaves his home and runs toward maxwell ' s house. if the distance between their homes is 14 kilometers, maxwell ' s walking speed is 4 km / h, and brad ' s running speed is 6 km / h. what is the total time it takes maxwell before he meets up with brad ?
Options: a. 2, b. 4, c. 5, d. 6, e. 8
[A]: a


[Q]: Problem: if money is invested at r percent interest, compounded annually, the amount of the investment will double in approximately 24 / r years. if pat ' s parents invested $ 6,000 in a long - term bond that pays 8 percent interest, compounded annually, what will be the approximate total amount of the investment 18 years later, when pat is ready for college ?
Options: a. $ 20000, b. $ 15000, c. $ 12000, d. $ 10000, e. $ 30000
[A]:
e