30 POINTS Type the correct answer in the box. Use numerals instead of words.

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).