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2 years ago

BRAINLIST AND 100 POINTS!!! PLEASE HELP!!

Mathematics

1 answer:

luda_lava [24]2 years ago

8 0

Answer:

a.) d,c and a,b

Step-by-step explanation:

hope it helped

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−5(x+2)=−5x+n<br> What is n?

kkurt [141]

I’m pretty sure that n is equal to -10

3 0

2 years ago

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A certain brand of refrigerator has a useful life that is normally distributed with mean 10 years and standard deviation 3 years

juin [17]

Answer: 0.55567

Step-by-step explanation:

Given : A certain brand of refrigerator has a useful life that is normally distributed with mean 10 years and standard deviation 3 years. The useful lives of these refrigerators are independent.

i.e.

$\mu=10\text{ years}\\\sigma=3\text{ years}$

Let $X_1$ and $X_2$ are two randomly selected refrigerator's life whose sum will exceed third selected refrigerator $X_3$ .

So that, $X =X_1+X_2-1.9\times X_3$

Mean $=E(X_1)+E(X_2)-E(X_3)=10+10-1.9\times10 =1$

Standard deviation = $\sqrt{(Var(X_1)+Var(X_1)+Var(X_1))}$

$=\sqrt{(3^2+3^2+(1.9\times3)^2)}$

$=7.1056315694$

Z-score : $z=\dfrac{X-E[x]}{\sqrt{Var[x]}}=\dfrac{0-1}{7.0156315694}\approx-0.14$

Now , The probability that the total useful life of two(i..e n=2) randomly selected refrigerators will exceed 1.9 times the useful life of a third randomly selected refrigerator would be :-

$P(Z>-0.14)=P(Z$

Hence, the required probability is 0.55567.

3 0

3 years ago

the perimeter of a pentagon (a five-sided polygon) is 50 in. the five sides are represented by consecutive integers. Find the le

posledela

Answer:

8, 9, 10, 11, 12

Step-by-step explanation:

Consecutive integer problems are often easier to work if you consider average values. Here, the middle of the 5 consecutive integers is their average, which is 50/5 = 10.

This tells you the integer side lengths are 8, 9, <em>10</em>, 11, 12.

7 0

2 years ago

Tom took four seconds to run 6 yards Diane ran 5 yards in three seconds if they continue to run at the same speed who were to ge

tatiyna

Answer:

Diane

Step-by-step explanation:

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3 years ago

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Rachel has 1/2 pound of flour in a container. If the container is 2/5 full, how many pounds of flour can Rachel fit in the entir

Westkost [7]

Answer:

1 1/4 pounds

Step-by-step explanation:

You can write the equation ...

(1/2) lb = (2/5) × container

Multiplying by the inverse of 2/5 gives ...

(1/2)·(5/2) lb = container

5/4 lb = container

container = 1 1/4 lb

3 0

3 years ago