Construct line segment EF with a length of 6 3/4 inches. I am TERRIBLE at math! Please help me, I am willing to give more than my usual amount of points!

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.

With number 11 ( show how you got the answer)

The value, v, of kalani’s stock investments over a time period, x, can be determined using the equation v=750(0.80)^-x. what is the rate of increase or decrease associated with this account? 20% decrease 20% increase 25% decrease 25% increase