It’s multiplying by 4.
1x4=4
4x4=16
16x4=64
The answer is 4.
The reason is that 5 times 4 is 20.
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|x - 6.5| < 0.02 ft is the <span>absolute value inequality for the possible lengths of the pole.</span>
An imaginary number " i " is the squared root of -1, so whenever you square i it's like squaring a squared root. The squared root would cancel and you would be left with just the number under it, that is, the -1.
i ^ 2 = -1
