book Maths Puzzle Numerical Ability

simplify the expression
-4(5c+7)-3c+13

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book Other Question

I dont quite understand ow to solve this problem.

Solve for a H=18t+1/2at(this last t is supposed to be squared)
if Jane takes 5 hours to paint a house and John takes 6 hours to paint a house. How long will it take them working together?