8 3/4 ÷ (-3 1/2) PLS I NEED HELP

Write and solve a real word problem that involves determining distance on a coordinate plane

Combine like terms to make a simpler expression 3z+z

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)