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DaniilM [7]
3 years ago
15

20 points!!! Brainly

Mathematics
1 answer:
Paladinen [302]3 years ago
5 0

Answer:

I think the last one try I guess if not then ask someone else

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For i^2 =-1, (3-i)^2 = ?<br><br> A. 8<br> B. 10<br> C. 8-6i<br> D. 8 + 6i<br> E. 10-6i
Anuta_ua [19.1K]
C. 8- 6i
(3- i) to the power of 2 (expand the expression)

9- 6 i + i to the power of 2
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The bacteria in an old piece of cheese is growing at a rate that can be modeled by y = 280 • 2x. Determine which number represen
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Suppose that only 65% of all drivers in a certain state wear a seat belt. a random sample of 80 drivers is selected. what is the
jonny [76]

Answer:

Pr(X >42) = Pr( Z > -2.344)

                = Pr( Z< 2.344) = 0.9905

Step-by-step explanation:

The scenario presented can be modeled by a binomial model;

The probability of success is, p = 0.65

There are n = 80 independent trials

Let X denote the number of drivers that wear a seat belt, then we are to find the probability that X is greater than 42;

Pr(X > 42)

In this case we can use the normal approximation to the binomial model;

mu = n*p = 80(0.65) = 52

sigma^2 = n*p*(1-p) = 18.2

Pr(X >42) = Pr( Z > -2.344)

                = Pr( Z< 2.344) = 0.9905

7 0
3 years ago
Dane is 10 times Brian's age. The difference in their age is 27, how old is Brian
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Hope this helps!
3 0
3 years ago
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Solve for X<br> -5x=45<br><br> A 225 <br> B 9 <br> C -9<br> D 45
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X=-9

-x=9 so x=-9 since you inverse the sign
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