exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

1, 12, 31, 99 -- Which number is prime?

Thanks,
Sher

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exam Other Question

1.) Write each of the following functions in English. Then evaluate the functions for the input values 9, 16.37, 0, and -10.

a.) y = 3x + 6
b.) y = x + 35 + 34 + 40 / Directions: Solve by the substitution method. Determine weather the equation is independent, Dependant, or inconsistent?

2x-y=4
2x-y=3