exam Maths Puzzle Numerical Ability

2) $5000 is invested for 10 year compounds quarterly, at the end of the 10 years the amount as grown to $11,500. What is the annual interest percentage rate to the rounded to the nearest 100th?

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exam Other Question
The lengths of the sides of a non-right triangle are 17 inches, 9 inches, and 12 inches. Find the area of the triangle. Round to the nearest tenth.
my answer is 17 * 9 + 12 = 165 / 3 = 55 (15/8) / (-4/3)