Which fractional part of the rock will remain at noon on day seven?

Plz i want answer and i would appreciate it is is a b c or d

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?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b