I left a $6 tip on a $40 lunch. What percent is this?

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?

What describes horizontal cross section of the right rectangle 6m 8m 5m

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"