Write an expression that can be used to find the area of the shaded region.

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?

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42