exam Maths Puzzle Numerical Ability

Please help me solve this problem. Carl walked n miles for charity, at a rate of $8 per mile. Write the expression to find out how much money Carl raised.

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exam Other Question

The rectangle of maximum area that could be inscribed inside a right angle triangle has dimensions equal to half the lengths of the sides adjacent to the rectangle. Prove that this Find the sum of the first five terms of the series
1 + 8 + 64 + 512 + .......