Can you please help me understand this

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Find the value of x for which abcd must be a parallelogram -9-6x x-30

For the quadratic function [tex]y=(x+4)^2-1[/tex] , do the following: a) rewrite the function in the standard form, b) rewrite the function in intercept form, c) find the vertex, d) find the y-intercept, e) find the x-intercepts.