exam Maths Puzzle Numerical Ability

On a christmas package Audrey needs to use only 40-cent stamps and 16-cent stamps. If she uses twice as many 40-cent stamps as 16-cent stamps, how many of each type of stamp must she use to mail a package costing $5.76 in postage?

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exam Other Question

how do i find the squares?

(7p+6q)^2
Does anyone know how to do this?

Factor completely. x^4 +x^2 -12