exam Maths Puzzle Numerical Ability

i. A perimeter of a rectangle is 14 inches, and the diagonal measures 5 inches. What are the length and the width?

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I need help, PLEASE~~

t/3-t+7<-4t/3+8

that is supposed to be is less then or equal, too, i think i didnt know how to put the line under it! How would you solve a problem like 4x(x-2)-5x(x-1)=2? When I tried the solution was weird. Could you please help me?