book Maths Puzzle Numerical Ability

there are 7.5 gallons of water in 1 cubic foot of water.
the cost of the water used is $5.00per 1000 gallons.
round your final answer to the nearest dollar.

Cylinder
* radius

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book Other Question

I'm not sure how to handle the radical in this quadriatic equation:

x^2 + x + sqrt(x^2 + x) - 2 = 0

In the provide examples, the duplicated x^2 + x can be substituted by some How do you find what F is in an equation like P=F/A