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Studentka2010 [4]
3 years ago
8

7.

Mathematics
1 answer:
ra1l [238]3 years ago
5 0

Step-by-step explanation:

if n=5

5-10+9(5)-3

-5+45-3

45-8=37

if n=-9

-9-10+9( -9)-3

-19-81-3=-103

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Caitlin has $5 and $10 bills that are worth $675. She has twice as many $10 bills as $5 bills. How many of each type of bill doe
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Caitlin has 27 $5 bills and 54 $10 bills.

Step-by-step explanation:

Given,

Worth of $5 and $10 bills = $675

Let,

Number of $5 bills = x

Number of $10 bills = y

According to given statement;

5x+10y=675    Eqn 1

She has twice as many $10 bills as $5 bills.

y=2x    Eqn 2

Putting value of y from Eqn 2 in Eqn 1

5x+10(2x)=675\\5x+20x=675\\25x=675

Dividing both sides by 25

\frac{25x}{25}=\frac{675}{25}\\x=27

Putting x=27 in Eqn 2

y=2(27)\\y=54

Caitlin has 27 $5 bills and 54 $10 bills.

Keywords: linear equation, substitution method

Learn more about substitution method at:

  • brainly.com/question/10699220
  • brainly.com/question/10703930

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7 0
3 years ago
a boat traveled at an average speed of 14.4 km/h for 3.5 hours. how far did the boat travel? use d=rt.
Semenov [28]
Answer is in the attachment below.

8 0
3 years ago
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(08.02)Using the following data, calculate the mean absolute deviation:
Dahasolnce [82]

Answer:

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65 ÷ 10

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Find the slope of the line​
Marianna [84]

Answer:

slope = 2

Step-by-step explanation:

To calculate the slope m use the slope formula

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with (x₁, y₁ ) = (1, - 2) and (x₂, y₂ ) = (3, 2) ← 2 points on the line

m = \frac{2+2}{3-1} = \frac{4}{2} = 2

7 0
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At the school carnival, students guessed how many marbles are in a jar. Marlo guessed 84 when it was actually 80. What percent o
Svetllana [295]

Answer:

5%

Step-by-step explanation:

Percent of error = \frac{84-80}{80} × 100%

                           = 5%

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Ann's taxes = \frac{17}{200} × $76

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Every week Roseanne gets paid $100 plus a 5% commission on all of her sales. If she has $5,000 in sales, how much is her pay for the week?

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Every week Kabore gets paid $100 plus 5% of his sales. How much does he need to sell if he wants to make $700 this week?

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Get-It-Done Depot has an ad for piping that reads:

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Mike needs 4 feet of piping. How much will it cost him?

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2 years ago
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