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melisa1 [442]
3 years ago
13

Please help I don't know how to do this ​

Mathematics
1 answer:
Mars2501 [29]3 years ago
5 0

Answer:

  • 18

Step-by-step explanation:

<u>Given AP with:</u>

  • a₁= 28, aₙ = 79, Sₙ = 963

<u>Use the formula:</u>

  • Sₙ = 1/2n(a₁ + aₙ), sum of the first n terms

<u>Substitute given values and solve for n:</u>

  • 963 = 1/2n(28 + 79)
  • 963 = 1/2n(107)
  • 1/2n = 963/107
  • 1/2n = 9
  • n = 9*2
  • n = 18

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A ​used-droid dealership buys a droid for ​$2900 and then sells it for ​$4300. What is the percent​ increase?
Anna71 [15]

The percent increase is 48.28

Step-by-step explanation:

Given,

Purchase price of used-droid = $2900

Selling price of used=droid = $4300

Profit = Selling price - purchase price

Profit = 4300-2900 = $1400

Percent increase = \frac{Profit}{Purchase\ price}*100

Percent\ increase=\frac{1400}{2900}*100\\\\Percent\ increase=\frac{140000}{2900}\\\\Percent\ increase=48.275\%

Rounding off to nearest hundredth;

Percent increase = 48.28%

The percent increase is 48.28

Keywords: percentage, subtraction

Learn more about percentages at:

  • brainly.com/question/12148432
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8 0
3 years ago
Kevin is 3 times as old as Daniel. 4 years ago, Kevin was 5 times as old as Daniel. How old is kevin now?
puteri [66]
K = Kevin's age
D = Daniel's age

K = 3D

K - 4 = 5(D - 4)

Plug in 3D for the K values in the second equation.

3D - 4 = 5(D - 4)   Use the Distributive Property
3D - 4 = 5D - 20   Add 4 to both sides
     3D = 5D - 16     Subtract 5D from both sides
    -2D = -16            Divide both sides by -2
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 Now, plug that D value into the original equation.

K = 3D    Plug in the D value
K = 3(8)   Multiply
K = 24

Finally, you can double check your math.

4 years ago, Daniel would've been 4 and Kevin would be 20, so Kevin would've been 5 times as old as Daniel.  And 8 x 3 = 24.

So, Kevin is 24.
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3 years ago
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Which function produces an output of 5 for an input of -6?
kodGreya [7K]

Answer:

The answer is D

Step-by-step explanation:

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3 years ago
What is the anwser to the problem
torisob [31]

8 ) 712

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Subtracting this 64 from 71, we get 7, to which we append 2: 8 ) 72.

8 divides evenly into 72: 9.

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The quotient of a number and 2 increased by 9 is -15
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Answer:

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Step-by-step explanation:

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