exam Maths Puzzle Numerical Ability

I am attempting to help my daughter with her math homework and don't know what I am doing, please help.

Milk Problem: Handy Andy sells one-gallon cartons of milk (4 quarts) for

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Use the quadratic formula to solve the following equations

x^2 + 16x + 53 = 0 A company has 2 machines that produce widgets. An older machine produces 23% defective widgets, while the new machine produces only 8% defective widgets. In addition, the new mac