exam Maths Puzzle Numerical Ability

Find the sum of the first fifteen terms of the geometric series:
2-3+4.5-6.75+10.125

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exam Other Question

How do I symplify this equation?

(2^-1a^2b)^-3/4a^-9 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