Lamont had $600 in his checking account. Each week he withdrew $25 to pay his phone bill. Write a variable expression that describes how much is in his account at any given time. Use the variable x in your expression.

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?

Lee has $1.75 in dimes and nickels. the number of nickels is 11 more than the number of dimes. how many of each coin does he have?

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)