6 $\sqrt{5}$ +6 $\sqrt{20}$ + 2 $\sqrt{5}$
57 divided by 7
7 divided by 57
$\sqrt{\-49}$
Solve the differential equation y' - y = x*(y^3)using the change of unknown function z=1/(y^2)
find c
a - b/c = d
(x-2):5 < 3
find b
6+9+9+9+9+10+5
