exam Maths Puzzle Numerical Ability

I need help please!!

Solve by adding like terms :

-3xy + 8xy^-1x^0 / y^-2 - 3x^2x^-1x / (x^-1)^-1

Thank u!

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exam Other Question

the length of a rectangle is twice the width. the area is 72 square centimeters, what is the length

A. 48 cm
B. 24 cm
C. 12 cm
D. 6 cm
The base of a triangle is 6 cm greater than the height. The area is 20 cm^2. Find the height and the length of the base.

The height is ____ cm.
The base is ______ cm.

Is that enough information to help me?