Question

Hey guys! I need help with the final calculations on a couple ofproblems. Like how would you go about calculating these on thecalculator? Everytime I do the calculations, it comes out wrong.THANKS!!

1.) Ksp= (x)(2x)^2 = 4x^3 = 7.9 x 10 ^-9
x^3 = 2.0 x 10 ^ - 9
x = 1.3 x 10^-3

2.) Ksp = (Al 3+)(OH-)
2x10^-32 = (x)(3x + 10^-11) <--x is negligible
sAl(OH)3 = 2x10 ^-26

3.) 4x^3
1.3 x 10-19=4x^3
SHgBr2=x=3.2 x 10^-7