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WITCHER [35]
1 year ago
12

Plss help get brainiest if right!!

Mathematics
1 answer:
Fantom [35]1 year ago
8 0

Answer:

  • 18 quarters
  • 7 dimes

Step-by-step explanation:

The given relations can be used to write two equations describing the coins. One equation can express the total number of coins; the other, their total value.

__

<h3>setup</h3>

Let d and q represent the numbers of dimes and quarters, respectively. The the total number of coins is ...

  d + q = 25

and their total value is ...

  0.10d +0.25q = 5.20

<h3>solution</h3>

Using the first equation to write an expression for d, we can substitute that into the second equation.

  d = 25 -q

  0.10(25 -q) +0.25q = 5.20

  0.15q = 2.70 . . . . . . . . . collect terms, subtract 2.50

  q = 18 . . . . . . . . . . . divide by 0.15

  d = 25 -q = 7

You have 18 quarters and 7 dimes.

_____

<em>Additional comment</em>

It is generally convenient to solve for the number of the higher-value coin. That way, the numbers in the equations stay positive, tending to reduce errors.

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Answer:

He drove there at 60 mph, and he drove back at 36 mph.

Step-by-step explanation:

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270 = s(12 - t)

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270 = st + 24t

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Solve the first equation for t.

t(s + 24) = 270

t = 270/(s + 24)

Substitute in the second equation.

270 = 12s - s[270/(s + 24)]

270 = 12s - 270s/(s + 24)

Multiply both sides by s + 24.

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Answer: He drove there at 60 mph, and he drove back at 36 mph.

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3 years ago
Mr Smith class 1/3 were absent on Monday and Mrs. Brown class 2/5 were absent on Monday. If 4 students from each class were abse
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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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