book Maths Puzzle Numerical Ability

What is the area of a triangle if the sides are 2.6 ft.,3.4 ft., and 4.1 ft.

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book Other Question

An investment made at 9% compounded annually, grow to $926.60 at the end of 1 year. How much was orginally invested? How do I write an equation that corresponds to the given inequality?
example: y<4 Thank You