exam Maths Puzzle Numerical Ability

Can someone help me with this problem. I have to determine this is rational or irrational.

the negative symbol is alone to the left with the number 4 raised.
___
-4√16
I believe this is irrational

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exam Other Question

I need some assistance on these word problems can anyone help thank you tine!

Use the arithmetic sequence of numbers 2, 4, 6, 8, 10… to find the following:
a) What is d, the d
___5___ - ___8___ = 1
2x-3 3-2x