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These question are hard can you me with answers

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

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.