exam Maths Puzzle Numerical Ability

Determine the domain and range of each relation

y=sqrt(x-1)

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exam Other Question

A triangle has a perimeter of 28 meters . Find the length of each side of the trianle if the two shorter lenghts multiplied together equal the longer side multiplied by 5 I want help solving this problem $5000.00 WAS PUT IN A SAVING ACCOUNT FOR 4 YEARS THE AMOUNT OF INTEREST EARNED WAS $400.00 WHAT IS THE INTEREST RATE?