Which statement is true about the graphs of the two lines y = -5/4x + 2 and y =-5/4 x-1/2 ?

What percent of the circle below is shaded?

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase