book Maths Puzzle Numerical Ability

Walter ia a waiter. he earns a daily wage of $50, plus tips that are equal to 15% of the total dinners he serves. what was the total cost of the dinners he served if he earned $170 on tuesday?

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book Other Question

For f(x)= 1/x^2-2x-8, find the interval(s) where f(x)<0.
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Can't quite figure this one out. I think 2 is an answer and I think there's one more.
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Thanks for any help. writing mathematics

your friend needs help understanding how to find the slope of a parallel to a line that passes through the points (2,3)and (4,5). Write an explanation that w