Which ratio is greater than 7/15

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?