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Temka [501]
3 years ago
6

Simplify the expression (2+5i)(-1+5i)

Mathematics
2 answers:
topjm [15]3 years ago
8 0
(2+5i)(5i-1)=(-2-25)+i(10-5)=-27+5i
kati45 [8]3 years ago
4 0
(2+5i)(-1+5i)=\\
-2+10i-5i-25=\\
-27+5i
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Problems of normally distributed samples are solved using the z-score formula.

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\mu = 152, \sigma = 14.5

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Z = \frac{X - \mu}{\sigma}

Z = \frac{187 - 152}{14.5}

Z = 2.41

The z-score when x=187 is 2.41. The mean is 187. This z-score tells you that x = 187 is 2.41 standard deviations above the mean.

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