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John makes $10.50 pers hour what expression represens how much he will make if he works h hours

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.

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.