exam Maths Puzzle Numerical Ability

Simplify by adding like terms

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

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exam Other Question

consider the following formula

y=3(x+5)(x-2)
which one of the following formulas is equivelent to this one?

A.y=3x(squared)+9x-30
B.y=x(squared)+3x-10
c.y=3x(squared)+3x-10
D.y=3x(squared)+3x-30 Two sides of a triangle are equal. Each of the two equal sides is twice the length of the third side. The perimeter is 90 meters. Find the length of each side.