exam Maths Puzzle Numerical Ability

Perform the operations and simplify.

2x^2y^2 * cd^2
_
cd 4c^2x

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exam Other Question

Graph the function and state the domain and range.
y=4-x^2
x+5y=10
-2x-10y=-20

5y=x+10
divide by 5, each side
y=x+10/5
y=x/5+10/5
Problem with LCM
I then plug y into next equation
-2x-10(y equation)+ -10 (y equation)=-20
Need help to make sense out of LCM to finish problem