0.004 - (-2.51) + 0.027= show me how to get the answer

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Angela is buying a dress that is on sale for 20% off. if the original price of the dress is $40.00, how much money is angela saving on the dress? a. $0.80 b. $3.20 c. $32.00 d. $8.00