Last year sandro bought a book for $13.89. this year the same book cost $15.79. what is the percent of change

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Factor the polynomial by its greatest common monomial factor.

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14