exam Maths Puzzle Numerical Ability

My equation is:

Five plus a number is at least 16

I dont have a clue,much less an answer if anyone can help me I would appreciate it:)

Kia,14

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exam Other Question
- 13 - 61 + 23 = I need to check these four problems, can anyone help?

3^sqrt(-27)

sqrt(-3x)^2
(with the square inside the square root sign)

sqrt(-4)

3^sqrt(-1/8)