exam Maths Puzzle Numerical Ability

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

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exam Other Question

Write the equation of the line that passes through point (-6, 7) with a slope of 0.
A. x = -6
B. x = 7
C. y = -6
D. y = 7 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?