Brownies are $1.58 for a 6-pack and brownies are $3.99 for a 12-pack which is the better buy per a brownie

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?

Find the value of the variable and the length of each secant segment.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.