exam Maths Puzzle Numerical Ability

how do variables affect the answer of a multiplication propblem when you have both variables and numbers?

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exam Other Question

1. (2p+7)3(exponent)

2. 3a8b3/9a-4b-6
if the sides of a square are decreased by 2cm, the area is decreased by 36cm^2 how would i get the dimensions of the original square?