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3 years ago

(-30) - (+40) = (-30) + (-40) explain why this is true

Mathematics

2 answers:

Mariana [72]3 years ago

7 0

Answer:

This is true because negative and positive is positive that why there is a addition sign in the middle and positive 40 becomes negative

Step-by-step explanation:

VikaD [51]3 years ago

6 0

You have to distribute the minus sign into the parentheses and you multiply it.

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marshall27 [118]

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<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

$\overline{x} \pm z\frac{\sigma}{\sqrt{n}}$

The margin of error is:

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More can be learned about the z-distribution at brainly.com/question/25890103

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