exam Maths Puzzle Numerical Ability

wich number is a prime number
1
12
31
99

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exam Other Question

What is the domain of the function:
f(x) = 2x + 3 when the range is {5,7,9}?

f(x) = 1/4x + 3 when the range is {3, -17, 27}?

f(x) = -3x - 5 when the range is {-2, 0, 3}?
What is the inequality of -6+5x<9