exam Maths Puzzle Numerical Ability

A.how many 12 inch square tiles would be necessary to cover the floor of a square room that measures 14 feet on a side?

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exam Other Question

hi,
two linear equations:
x=-3y
x+y=4
Which points represent the common solution for the two equations?

the answer is (6, -2) how did they get that?

thanks I am not understanding multiplying radical expressions:

(2-3 cubed root 7) (5+2 cube root 7)