exam Maths Puzzle Numerical Ability

A rectangle is 5 times as long as it is wide. If the area is 125 square feet, find its perimeter.

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exam Other Question

Solve e^x = 2^x-1 For the follwoing I need to find

a. f^-1(x)
b. Graph f and f^-1 in the same rectangular coordinator system
c. Use interval notation to give the domain and range of f and f^-1