16) during an electronic store's sale days, the regular price for cd players is discounted $10. there is a
state sales tax of 5%, and the $10 discount is applied before the sales tax is calculated.
a) write an expression that shows the regular price r of a cd player minus the $10 discount.
b) write a rule for the function p(r) that expresses the final price p of a cd player with the discount
applied and sales tax included.
c) how much would you pay during sale days for a cd player regularly priced at $29.50?
im giving brainliest !
do you have a picture of the graph this way we can figure it out or do you have the coordinates at least
(4x + 1)(x - 5)
to start, we know that we will get something in the form of (ax + b)(cx + d), or (ac)x^2 + (ad + bc)x + bd. making some equations, we can see that ac = 4, ad + bc = -19, and bd = -5. notice that a and c cannot be 2 and 2, as 2d + 2b = -19 cannot be possible because -19 is odd. therefore, a is 4 and c is 1 (or vice versa). plug this back in to get 4d + b = -19, and bd = -5. simple guess and check shows that d = -5 and b = 1, so the answer is (4x + 1)(x - 5).