PLEASE HELP. I am timed for this and I need help with this question.
Find the surface area of the triangular prism. 15ft, 20ft, 12ft, and 9ft.

Identify the expression equivalent to 4(x + x + 7) − 2x + 8 − 4 by substituting x = 1 and x = 2.

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)

The sum of two numbers is 0. twice the smaller number subtracted from 3 times the larger number is 10. let x represent the larger number and y represent the smaller number. what is the equation