exam Maths Puzzle Numerical Ability

multipling polynomials
(2r^2)(3r^4(2r)

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exam Other Question

a homeowner whisher to paint the walls of his 15 foot by 20 foot storage shed. the walls of the shed are 10 feet high. the paint is tob applied at a rate of 400 square feet per gal could you please help me figure this out!!
x varies directly as the square of s and inversely as t. How does x change when s is doubled?
When both s and t are doubled?
Thank you for your help!!