The price of a cup of coffee was $2.65 yesterday. Today, the price fell to $2.40 . Find the percentage decrease. Round your answ
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corrected question:A jar contains two blue and five green marbles. A marble is drawn at random and then replaced. A second marble drawn at random. For each of the following, find the probability that: a) both marbles are blue b) both marbles are the same color c)the marbles are different in color
Answer:
Step-by-step explanation:
<u><em>The probability was done with replacement.</em></u>
Probaility of an event happening
number of blue marbles= 2
number of green marbles=5
total number of marbles=7
(a) probability that both marbles are blue = pr(first is blue)*pr(second is blue)
(b)probability that both marbles are the same color =pr(first is blue)*pr(second is blue) + Pr(first is green)*Pr(second is green)
(c)Probability that the marbles are different in colors=pr(first is blue)*pr(second is green) + Pr(first is green)*Pr(second is blue)
Answer: The correct option is (b)
Step-by-step explanation: Given that Abigail and Bailey wash dogs to make extra money. Abigail can wash all of the dogs in 5 hours and Bailey can wash all the dogs in 3 hours.
We are to find the time taken by them if they wash the dogs together.
Abigail can wash the dogs in 5 hours.
So, in 1 hour, the fraction of the dogs Abigail can wash is given by
Bailey can wash the dogs in 3 hours.
So, in 1 hour, the fraction of the dogs Bailey can wash is given by
Hence, if they work together, then the fraction of the dogs that they wash in 1 hour is given by
Therefore, the time taken by them to wash the dogs if they work together will be
Thus, option (b) is correct.