Which representation has a constant variation of -2.5?

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?

Ab based on the given diagram, if m_1 = 60° then m 2 = 30 60 90 180

What expression is equivalent to log3(x+4)