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Rufina [12.5K]
2 years ago
10

The national cost C in billions of dollars for dental services can be modeled by the linear equation c=2.85n+30.52​, where n is

the number of years since 1990. What would be the cost in billions of dollars in​ 2014?
Mathematics
1 answer:
DIA [1.3K]2 years ago
3 0

Answer:

c=98.92

Step-by-step explanation:

first I figured out the number of years between 1990 and 2014.I basicly just subtracted 1990 from 2014 then times it by 2.85 the added 30.52

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Fynjy0 [20]

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5 0
3 years ago
Solve the equation<br> 9x² – 29x – 28 = 0<br> Give your answers to 2 decimal places when appropriate
andrew-mc [135]

Answer:

x = 4 or x = 0.78

Step-by-step explanation:

9x² – 29x – 28 = 0

2 roots: x = ((-(-29) ± √(-29)² - 4 x 9 x (-28)) / (2 x 9)

               = (29 ± √841 + 1008) / 18

               = (29 ± 43) /18

x = 72 /18 = 4     or

x = -14 /18 = - 0.78

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2 years ago
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Step-by-step explanation:

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6 0
2 years ago
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larisa86 [58]
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3 years ago
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goldfiish [28.3K]
The answer is 16 because 16•5=80 and then 80-9=71 yk?
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