What is the equation of the line that has a y-intercept of (0,-3) and passes through the point (-9,-9)

What is the number 321,000,000 in scientific notation? also what is the number? ?

True or false look at the picture pls : /

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.