exam Maths Puzzle Numerical Ability

I would appreciate any help you can give me.

A spherical water tank is 12.6 ft. in diameter. What is the weight of the water in the tank if water weighs 62.4 lb/ft cubed?

Thank You,

makennedy01

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I am stuck on correct answer for:

(2x - 1)(10x +1)=:

I believe the answer is 12x but I want to verify.

I am not using a specific book. I am just practicing... if m(-11,13) is the idpoint of segment PQ and the coordinates od P are (-6,6), find the coordinates of Q.