X^2 -144 how do i solve it in difference of perfect squares (Level 1)

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

20 solve 2(4 x + 3) < 5 x + 21. a) { x | x < 9} b) { x | x > -5} c) { x | x > -9} d) { x | x < 5}