Can you please Help me with this?

(Greatly Appreciated)

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 4x^2 - 19x- 5