exam Maths Puzzle Numerical Ability

In a small rectangular wallet photo, the widith is 7 cm less than the length. If the border (perimeter) of the photo is 34cm, find the length and width

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Please help me to solve my homework question. thanks!

Write in lowest terms

25x^2-16/15X^3+7x^2-4x
can some one please help, i do not knwo how to figure this out. thanks
76. x^3-1/x^2+1 divided by 9x^2+9x+9/x^2-x