book Maths Puzzle Numerical Ability

I'm trying to find the answers to these problems. I need to simplify?

4(Z + 8) - Z
2(4Y + 6) - 3Y
3(X - 5) + 8X

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book Other Question

can you help me solve this problem?

rh^2-ph+q=0 solve for h
this is what i have so far

rh^2-ph=-q
h(hr-p)=-q
? The wages of 5 newpaper carriers totaled $110 for 2 weeks work. How much will 3 carriers earn if they work for 3 weeks each at the same weekly rate?