exam Maths Puzzle Numerical Ability

Solve. (x+4)(x-5)(x+3)>0

What is the solution set? {x }

Thank you I really need help with this!!!

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exam Other Question

3 over a^2-9 + 2 over a+3
all over
4 over a^2 -9 + 1 over a+3

the answer is 2a-3 over a+1

show how you would get that
Solve the following application.
Statistics. A survey of 400 people found that 66 were left-handed. What percent of those surveyed were left-handed?