exam Maths Puzzle Numerical Ability

The length of the rectangle is 3 times its width. The perimeter of the rectangle is 160 ft. Find the length and the width of the rectangle. Solve the problem algebraically.

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exam Other Question

Finding (f*g)(x) and (g*f)(x) and the domain of the following.

f(X)= squared root of x+1
g(x)= squared root of x-1 please help me to solve this:
find the two numbers whose sum is 13 and the sum of whose squares is 145