She made the first error in Step 2, so the answer is B. -1 times -3 is 3, not -3.
(8/-4) / (-3/9)=
(8/-4) * (9/3)=
72/-12=
-6
Using the formula V = L x W x H, multiply the 3 dimensions together.
17 x 1.3 x 8 = 176.8 cubic inches.
Sqrt(18x^5y) + sqrt(32xy^3) - sqrt(128xy)
You may separate the roots to produce solvable square roots!
sqrt(9x^4)*sqrt(2xy) + sqrt(16y^2)*sqrt(2xy) - sqrt(64)*sqrt(2xy)
Simplifying makes it ...
(3x^2 + 4y - 8)*sqrt(2xy)
This should be the closest you can get to a simplified equation.