What is the perpendicular slope of y=4x+10

What is the value of x? enter your answer in the box. photo attached.

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?

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)