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Andrew [12]
3 years ago
15

Jack has a business mowing lawns and charges a flat fee of $20 per yard, plus an additional $5 an hour. He wants to make sure th

at he makes at least $70 doing yard work for a client with a very large yard. He sets up and solves the equation above
Mathematics
2 answers:
podryga [215]3 years ago
6 0
If you do 20 + 5x = 70, that'll give you the total hours (x)

70-20 = 50,
5x = 50
Divide each by 5,
x = 10
Marat540 [252]3 years ago
4 0

Answer:

He takes minimum 10 hours to make a very large yard .

Step-by-step explanation:

Given

Jack charges a falt fee  per yard = $20

Jack charges  an additional money per hour = $5

He wants to make sure that he makes at least $70 doing yard work for client by making   a very large yard

Let , he takes x  hour for making a very large yard

Therefore , we make an inequality

20+5x\geq 70

Subtracting 20 from  both side then we get the inequality

 5x\geq 50

By simplication we get

x\geq \frac{50}{5}

By dividing we get

x\geq 10

Hence, he takes atleast  10 hours for making a very large yard if he doing yard work and makes atleast $70 .

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san4es73 [151]

Answer:

1) D

2) C

Step-by-step explanation:

1. The blue algae has an initial mass of 20 kg and doubles its mass every hour. Then after t hours, the mass of blue algae is

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Part I) At t=3:

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The blue algae has 320-208=112 kg more mass at 4 hours.

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