Question

Which number satisfies the inequality 12n < 3n + 28?
A.) 3
B.) 4
C.) 5
D.) 6

Answer 1

Let's move the terms with n to one side:
12n < 3n + 28 => 12n - 3n < 28
9n < 28 => n < 28/9
n < 3.1111
The only answer which satisfies this inequality is A.