42% of what number is 38.22?

Solve: 3x+y=6 4x-2y=18 show all work !

Iwill give you ! what is the measure of ∠v ?

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)