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3 years ago

Please help me solve -2(-3-3n)+1

Mathematics

2 answers:

vivado [14]3 years ago

8 0

Answer:

6n +7

Step-by-step explanation:

You cannot solve since this is an expression, you can only simplify

-2(-3-3n)+1

Distribute the -2

-2*-3 -2*-3n +1

6 +6n +1

Combine like terms

6n +7

kenny6666 [7]3 years ago

4 0

Answer:

7+6n

Step-by-step explanation:

First you have to distribute -2

That will give you 6+6n+1

After that you have to combine like terms 6+1

The answer is 7+6n

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3 years ago

A scientist inoculates mice, one at a time, with a disease germ until he finds 3 that have contracted the disease. If the prob

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Answer:

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Step-by-step explanation:

Given : A scientist inoculates mice, one at a time, with a disease germ until he finds 3 that have contracted the disease. If the probability of contracting the disease is two sevenths.

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Solution :

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$P(X=r)=^nC_r p^rq^{n-r}$

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Substitute the values,

$P(X=3)=^8C_3 (\frac{2}{7})^3 (\frac{5}{7})^{8-3}$

$P(X=3)=\frac{8!}{3!5!}\times \frac{8}{343}\times (\frac{5}{7})^{5}$

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4 years ago