exam Maths Puzzle Numerical Ability

The length of a rectangle is 4 cm less that three times its width. If the length is increased by 8 cm and the width is decreased by 2 cm, the perimeter will be 100 cm. Find the dimensions of the orifinal rectangle.

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exam Other Question
Can someone show me how to write the mapping rule that shows the transformation of y=2^x for the equation 1/4(y-5)=2^(x-3)? Need help with these problems. Not understanding the process on how to solve.
1. Simplify the rational expression:
x2 - 6x + 5
x2 - 25



2. Divide:
x2 - 9x + 8 ÷ x2