12.) During the first 3 weeks of training, a runner runs 20 miles, 22 miles, and 21 miles. How many miles must she run during the fourth week to have a mean of at least 22 miles per week?
10 miles
15 miles
20 miles
25 miles

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?

Acylinder has volume 45π and radius 3. what is it’s height?

Atemperature of 1.64◦f corresponds to answer in units of ◦c.