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KATRIN_1 [288]
3 years ago
5

HELP ASAP PLSS! The graph represents the relationship between the amount of money a babysitter makes, m, and the hours the baby

sitter works, h. Which function can be used to determine the amount of money the babysitter makes, d, after h hours? d=17h+5 d = 5h + 7 d = 7h +5 d=15h+7
Mathematics
1 answer:
raketka [301]3 years ago
6 0

Answer:

d = 7h +5

Step-by-step explanation

If you go to K-12 then this is the right answer I just took the quiz.

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Dennis went cross country skiing for 6 hours on Saturday. He skied 20 miles uphill and then 20 miles downhill, returning to his
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Answer: Downhill:10mph   Uphill:5mph

Step-by-step explanation:  

We are looking for Dennis’s downhill speed.

Let  

r=

 Dennis’s downhill speed.

His uphill speed is  

5

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Let  

r−5=

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miles.

Since  

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t=

D

r

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We divide the distance by the rate in each row and place the expression in the time column.

Rate

×

Time

=

Distance

Downhill

r

20

r

20

Uphill

r−5

20

r−5

20

 

Write a word sentence about the time.

The total time traveled was  

6

hours.

Translate the sentence to get the equation.

20

r

+

20

r−5

=6

Solve.

20(r−5)+20(r)

40r−100

0

0

0

=

=

=

=

=

6(r)(r−5)

6

r

2

−30r

6

r

2

−70r+100

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r

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2(3r−5)(r−10)

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5

3

The solution  

5

3

is unreasonable because  

5

3

−5=−

10

3

and his uphill speed cannot be negative. So, Dennis's downhill speed is  

10

mph and his uphill speed is  

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mph.

Check. Is  

10

mph a reasonable speed for biking downhill? Yes.

Downhill:

10 mph

5 mph⋅

20 miles

5 mph

=20 miles

Uphill:

10−5=5 mph

(10−5) mph⋅

20 miles

10−5 mph

=20 miles

The total time traveled was  

6

hours.

Dennis’ downhill speed was  

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5

mph.

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