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Tema [17]
2 years ago
14

You have quarters and dimes that total $2.80. Your friend says it is possible that the number of quarters is 8 more than the num

ber of dimes. Is your friend correct? Explain. Let d represent the number of dimes.
Mathematics
1 answer:
docker41 [41]2 years ago
5 0

Answer:

No.

Step-by-step explanation:

Let d represent the number of dimes. Then the number of quarters (according to the friend) is d+8. The total value is

... 10d +25(d+8) = 280 . . . . in cents

... 35d + 200 = 280 . . . . . . eliminate parentheses

... 35d = 80 . . . . . . . . . . . . . subtract 200

... d = 80/35 = 16/7 = 2 1/7 . . . . . not a realistic number of coins

_____

The difference between the number of quarters and the number of dimes may be any multiple of 7.

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Step-by-step explanation:

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2 years ago
Which are the better statistics to use to compare the penguin heights?
frozen [14]

Answer:

The correct options are A and B.

Step-by-step explanation:

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S = {35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45}

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\text{Mean}=\frac{1}{n}\sum X\\\\=\frac{1}{11}\times [35+36+37+38+39+40+41+42+43+44+45]\\\\=40

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The mean and median are same.

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