The perimeter of a square is 28cm.
Work out the area of the square.

What is the difference between the predicted value and the actual value

Two numbers have a sum of -19. one number is x. what expression represents the other number?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )