exam Maths Puzzle Numerical Ability

factoring a quadratic with leading coefficient greater than one
2y^2+15y+28

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exam Other Question

Please help me, can you explain how to do this????

Given h(x)=4x+8, find 4[h(-3/4)].

I have no idea how to do this!!!
HELP!
a vending machine takes only dimes and quarters. so far the machine has only taken a total of 30 coins. the amount of money it has collected is $4.20.