2(2x - 4)
5/6 divided by 15
3 (4(4)-3)
625 x 5
125 x 5
99 divided 1/6
125 divided by 25
3.5/70 รท 7/10
17/6 over 3/4
f(x,y)=(1)/(\sqrt(x^(2)+y^(2)+16)), find domain and range
