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Nina [5.8K]
3 years ago
8

-0.71x + 0.41x = 6.3 _x = 6.3

Mathematics
1 answer:
Zina [86]3 years ago
3 0
Add the two x’s to get -.3 then divided that by 6.3 and get -21
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At Alan's auto shop, it takes him minutes to do an oil change and minutes to do a tire change. Let be the number of oil changes
kirill [66]

Complete question :

At Alan's auto shop, it takes him 9 minutes to do an oil change and 12 minutes to do a tire change. Let x be the number of oil changes he does. Let y be the number of tire changes he does. Using the values and variables given, write an inequality describing how many oil changes and tire changes Alan can do in less than an hour ( minutes).

Answer:

9x + 12y < 120

Step-by-step explanation:

Given that:

Time taken for oil change = 9 minutes

Time taken for tire change = 12 minutes

x = number of oil changes ; y = number of tire changes

Total hours = 1 hour = 60 minutes

Number of oil and Tyre changes possible in less than an hour

(Number of oil changes * time taken) + (number of tire changes * time taken) less than 60 minutes

9x + 12y < 120

8 0
3 years ago
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3.2x + 7.9 + 8.2 + 6.7x<br> Simplify the expressions. (not equations!) <br> Please help ASAP.
Temka [501]

Answer:

9.9x + 16.1

Step-by-step explanation:

SImplify using like terms

Simplify:

  • 3.2x + 7.9 + 8.2 + 6.7x
  • 3.2x + 6.7x + 7.9 + 8.2
  • 9.9x + 16.1

-Chetan K

4 0
2 years ago
Assume a researcher recruits 150 African American and Caucasian individuals taking warfarin to determine if there is a differenc
Anettt [7]

Answer:

Z=11.0

Step-by-step explanation:

Let Caucasian individuals be the population 1 and African American be the population 2. So, we are given that

n=150

n1=75

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standard deviation1=S.D1=σ1=1.1.

Variance1=V(x1)=σ1²=1.1²=1.21.

n2=75.

mean2=xbar2=4.3.

standard deviation2=S.D2=σ2=0.9.

Variance2=V(x2)=σ2²=0.9²=0.81.

The z-statistic is

Z=\frac{xbar1-xbar2}{\sqrt{\frac{V(x1)}{n1}+ \frac{V(x2)}{n2} } }

Z=\frac{6.1-4.3}{\sqrt{\frac{1.21}{75}+ \frac{0.81}{75} } }

Z=\frac{1.8}{\sqrt{0.0161+ 0.0108 } }

Z=\frac{1.8}{\sqrt{0.0269 } }

Z=\frac{1.8}{0.164 } }

Z=10.97

Z=11.0

So, the z value obtained while calculating the test statistic is approximately 11.0.

4 0
2 years ago
A rain gutter is made from sheets of aluminum that are 20 inches wide by turning up the edges to form right angles. Determine th
marishachu [46]
20in flat -> 2 sides of 10in at 90degrees from eachother

area would be 10*10/2 =50in^2

4 0
3 years ago
angel is visiting a cousin 280 miles away from nashville. he’s already driven 70 miles in the first hour. at that speed how many
Tpy6a [65]

Answer:

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Step-by-step explanation:

Angel's remaining distance is ...

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At 70 miles per hour, it will take ...

  (210 mi)/(70 mi/h) = 3 h

to cover the remaining distance.

_____

The appropriate relationship is ...

  time = distance/speed

4 0
3 years ago
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