Rewrite the equation of the parabola in vertex form. y = x2 + 8x - 21

A)y = (x + 4)2 - 37

B)y = (x + 4)2 - 21

C)y = (x + 4)2 - 5

D)y = (x + 432 +5

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.

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!

Given abc find the values of x and y. in your final answer, include all of your calculations.