exam Maths Puzzle Numerical Ability

How many ways can a baseball coach choose the first, second and third batters in the lineup of a team of 15 players.

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exam Other Question

I am suppose to simplify quotients containing radicals by rationalizing the denominator.
Problem: 30 over square root of 18
problem: 9 over 2 square root 45
Problem: 3 square root 6 over square root 2

please help
Solve the following system of linear inequalities by graphing.
x + 2y <= 3
2x - 3y <=6