exam Maths Puzzle Numerical Ability

The price of an item is fiven by p=2x^2-100. Find the polynomial that represents the revenue generated from the sale of x items.

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exam Other Question

The Nys had eight grandchildren in 2002. In 2003, they had 12 grandchildren. Find the percent increase in the number of grandchildren from 2002 to 2003. I am trying to figure out (h) in the following problem. A=1/2h(B+b) where as A=80, B=12, and b=8. I have tried it and come up with h=80 but when i plug the number back in it does not balance out. Please help