How do you solve each system by elimination

Use the net as an aid to compute the surface area of the triangular prism. a) 550 m2 b) 614 m2 c) 670 m2 d) 790 m2

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

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.