What is the rate of change?

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Who long does it take to drive 150 miles at 45 miles per hour

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose