book Maths Puzzle Numerical Ability

hi can you please help me with this question...it says:
substitute a=-12 and b=-2 to find the value of this expression
2(a-5b)

thank you

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book Other Question

I am having trouble with this question, Find the lowest common denominator of p+3
----------
p^2+7p+10

and
p+5
----------
p^2+5p+6

Can someone please help me? **simplify**
3m-2(-5m-8)

(8d^2+6d+4)/2

(3/4)(12g+48

2(a+b)-3(-2a-b^2)