exam Maths Puzzle Numerical Ability

I am not understanding multiplying radical expressions:

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

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exam Other Question

use elimination to solve the system 3x+5y=16 and 8x-5y=28 for x Write the sentence as an equation, using x for the unknown number. Then solve the equation.

Four times a number added to 8 times the number equals 48. Find the number.