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Reptile [31]
3 years ago
14

Claudia makes an initial deposit of $50 into her bank account. She deposits $20 into the account each week. Let x represent the

number of weeks Claudia makes a deposit, and let y represent the amount of money in her account. Which equation represents the amount of money in Claudia's account after x weeks?
y=20x−50

y=−20x+50

y = 50x + 20

y = 20x + 50
WILL MAKE BRAINLIEST ANSWER
Mathematics
1 answer:
Margarita [4]3 years ago
6 0
The answer would be D. because she has 50 dollars in her account and she adds 20 dollars for x amount of weeks so that will get you y=20x+50
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<h3>Answer: A and B (first answer choice)</h3>

Explanation:

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at maximum speed, an airplane travels 1720 miles against th wind in 5 hours. Flying with the wind, the plane can travel the same
iragen [17]

Answer:

x = 387

Step-by-step explanation:

The wind acts in the opposite direction to the plane when the time is longer.

The wind acts in the same direction as the plane when the time is shorter.

Equation

d = r*t

Givens

  • d = 1720
  • x = plane's speed
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  • t2 = 4 hours.

Substitution

  • d = (x + y) * t
  • 1720 = (x + y) * 4
  • 1720 = (x - y) * 5

Since the two distances are the same, you can equate the right hand sides.

  • (x + y) * 4 = (x - y)*5              Remove the brackets.
  • 4x + 4y = 5x - 5y                  Add 5y to both sides
  • 4x + 4y + 5y = 5x - 5y + 5y  Combine all the terms.
  • 4x + 9y = 5x                          Subtract 4x from both sides
  • 9y + 4x - 4x = 5x - 4x           Combine
  • 9y = x

Now use one of the given equations with the distance

  • 1720 = (x + y)*4           Substitute 9y for x
  • 1720 = (9y + y) *  4      Combine
  • 1720 = 10y * 4             Multiply the right
  • 1720 = 40y                  Divide by 40
  • 1720/40 = 40y/40      Do the division
  • 43 = y                          y = wind speek
  • 9y = x                          x = 9*y  
  • 9*43 = x
  • x = 387 miles per hour.
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