exam Maths Puzzle Numerical Ability

Victor earns $3 an hour working after school and $4 an hour working on saturdays. Last week he earned $43, working a total of 13h. How many hours did he work on saturday?

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A certain experimental drug causes a decrease in blood pressure modeled by
D(X) = .4x^3 - 3x, where D is the mm of mercury and x is in grams of the drug. Find the average rate of Please help me set up a spreadsheet with calculations for each .01 increment. The answer should be a specific price greater than 175.00. please show work
There are two companies