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Molodets [167]
3 years ago
11

Amy shops at two stores for a new sweater. The sweater at the first store costs $10 less than four times the cost,c, of the swea

ter at the seconds store. The sweater at the first store costs &80. Write and solve an equation to find the cost of the sweater at the seconds store
Mathematics
1 answer:
wolverine [178]3 years ago
6 0

Answer:

The cost of the sweater in the second store is $22.50

Step-by-step explanation:

From the problem we know that......

$80 = 4c - $10

There for.......

4c = $80 + $10

4c = $90

c = $90 / 4

c = $22.50

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Answer:

The probability that the household has only cell phones and has high-speed Internet is 0.408

Step-by-step explanation:

Let A be the event that represents U.S. households has only cell phones

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We are given that 51% of U.S. households has only cell phones

P(A)=0.51

We are given that 70% of the U.S. households have high-speed Internet.

P(B)=0.7

We are given that U.S. households having only cell phones, 80% have high-speed Internet. A U.S household is randomly selected.

P(B|A)=0.8

\frac{P(A\capB)}{P(A)}=0.8\\P(A\capB)=0.8 \times P(A)\\P(A\capB)=0.8 \times 0.51\\P(A\capB)=0.408

Hence the probability that the household has only cell phones and has high-speed Internet is 0.408

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3 years ago
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