U might've done it right. The formula is 1/2a*c*h i cant really see the numbers thats why
a= height
c= base
h= length
We can solve for x in by substituting 'y=15-5x' from the second one into the first equation, because in the second equation, y has no coefficient, which will make it easier to substitute.
You combine like terms
Your answer will be -7x^5 - 2x^3 - 6x^2 -9
Ok first you divide -1/2 by -8 which equals your answer
