2(7z + 4) im confused abt this nothing hard

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

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

What is the length of the midsegment of a trapezoid with bases of length 15 and 25 ?