exam Maths Puzzle Numerical Ability

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...

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exam Other Question

Excercise 4-8
Using the eighteen valid arguement forms, prove the following arguements are valid. (These proofs are very basic. None require more than six additional lines to comp 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