book Maths Puzzle Numerical Ability

how do you solve and graph this inequality?
a^2+2a< or = 15?

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book Other Question

Which Statement is true if n is a whole number?

a. if 20/n=5, then n/5=4
b.if 20-n=5, then n/5=4
c.if 5 x n=20, then n+5=25
d.if 20/n=5, then 20/5+n the difference between 2 numbers is 8. the smaller number is m. the larger number is ?