Write the function f(x)=x^2- 21x in the form f(x) = a(x - h)2 + k. Identify the vertex.

Use the graph of the sine function y=2sinθ shown below

Add the fractions and simplify 1/2+ 1/3

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints