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Gwar [14]
2 years ago
8

Sally can paint a room in 4 hours while it takes steve 5 hours to paint the same room. How long would it take them to paint the

room if they worked together?

Mathematics
1 answer:
sdas [7]2 years ago
8 0

Answer:

I think it's 20/9 hours. so 2.222222... hours.

Step-by-step explanation:

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At a college, 72% of courses have final exams and 46% of courses require research papers. Suppose that 32% of courses have a res
Ghella [55]

Answer:

a) P(F UR) = P(F) +P(R) -P(F and R) = 0.72+0.46-0.32=0.86

b) P(FUR)' = 1-P(FUR)= 1-0.86 = 0.14

Step-by-step explanation:

Let's define the following events first:

F: The event that a course has a final exam.

R: The event that a course requires a research paper

From the info provided we have that:

P(F) = 0.72, P(R) =0.46 P(F and R) =0.32

So then we can create a Venn diagram as we can see on the figure attached.

a. Find the probability that a course has a final exam or a research project.

For this case we can find the probability like this:

P(F UR) = P(F) +P(R) -P(F and R) = 0.72+0.46-0.32=0.86

b. Find the probability that a course has NEITHER of these two requirements.

For this case we can use the complement rule and we can find the probability like this:

P(FUR)' = 1-P(FUR)= 1-0.86 = 0.14

And that's the same value obtained with the diagram.

8 0
3 years ago
Can someone help with these two questions
kherson [118]

11,513 is the answer I really don't know how to write it all out sorry

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Solve for x y=c(x+b)
sergeinik [125]

Step-by-step explanation: To solve for x in this literal equation, I would first distribute the C through the parentheses to get y = cx + cb.

Now subtract cb from both sides to get y - cb = cx.

Finally, divide both sides by c to get y - cb / c = x.

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How many dimes equal the value of 6 quarters.show you step​
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Answer:

the answer to this complicated problem is 25

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Answer:

12

(If needed explanation ask in the comments! ty)

Hope This Helps! •v•

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