book Maths Puzzle Numerical Ability

(5m+5)=7-2m
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4


I NEED HELP!

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book Other Question

find the domain and the range of the following function

f(x) = 3x2+2 that is x squared thanks
If you could, please help me with these 2 problems.
The directions says to simplify the variable expressions.
(-14)(-y^2)
and
8(-y^2)^2