Add the polynomials. (x^2+3x-1)+(4x^2+2x+5)

Each of the four sides of a swimming pool measures 9 meters. the pool is 5 meters deep. how much water will be needed to fill it completely? a. 45 cubic meters b. 81 cubic meters c. 225 cubic meters d. 405 cubic meters reset next

How do you use the elimination method for this question? explain, because i really want to understand!

What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7