exam Maths Puzzle Numerical Ability

I have to solve the equation r + 5 = -1.

Can someone please help me?

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exam Other Question

What is the level of significance?
A) Probability of a Type II error
B) Probability of a Type I error
C) z-value of 1.96
D) Beta error
E) None of the above What is LCM of 14and 15