exam Maths Puzzle Numerical Ability

FOIL:

I understand how to do this. I just need a sanity check.

(a+7)(a-5)
My answer is this
a^2-2a+35

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exam Other Question

Please help me find the volume, to the nearest tenth, of a pyramid that is 6 feet tall and whose base is an equilateral triangle with sides each 10 feet long? show how to find the greatest common factor for:

42,90
34,68
56,150
28,45
60,350
40,68