A rectangle has a perimeter of 80 cm. If its width is x cm, that makes its length 40 - x cm. What is the maximum area of the rectangle?

Explain how you do each step what term makes it inconsistent y=2x - 4 ?

Aparking garage charges $1.12 for the first hour and 0.50 for each additional hour. what is the maximum length of time tom can park in the garage if we wishes to play no more than $5.62

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25