Hats are on sale at 4 for $20. At this rate, how much would 7 hats cost?

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)

Griffin ordered a pair of sneakers online. he had a $22 credit that he applied toward the purchase, and then he used a credit card to pay for the rest of the cost. if the shoes cost $58, how much did griffin charge to his credit card when he bought the sneakers?