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

Graph a line that passes through (4, -2) and is perpendicular to a line whose slope is -3. Find three consecutive odd integers of which one half of the sum of the first and second equals the square of the difference of the third and the first.