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Tems11 [23]
3 years ago
15

Solve for e Give an exact answer 0.75(8 + e) = 2 - 1.25e

Mathematics
1 answer:
DerKrebs [107]3 years ago
8 0

Answer:

E=-2

Step-by-step explanation:

I substituted -2 for E as the product was also an equation with subtraction.

0.75(8+-2)=2-1.25(-2)

0.75 × -6 = 2- 2.50

-4.5=-0.50

/-4.5 /-4.5

-------------------

e=-2

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The U.S. Department of Transportation provides the number of miles that residents of the75 largest metropolitan areas travel per
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Answer:

a. The point estimate of the difference between the mean number of miles that Buffalo residents travel per day and the mean number of miles that Boston residentstravel per day is 88

b. The 95% confidence interval for the difference between the two population means is (0.58171,7.21829)

Step-by-step explanation:

a. According to the given data we have the following:

Buffalo residents mean=22.5

Standard deviation=8.4

n=50

Boston residents mean=18.6

Standard deviation=7.4

n=40

Hence, the point estimate is the difference of the means=22.5-18.6=3.9

The standard error=√((s1∧2/n1)+((s2∧2/n2))=√((8.4∧2/50)+(7.4∧2/40))=1.67

Therefore, the difference of miles=n1+n2-2=50+40-2=88

The point estimate of the difference between the mean number of miles that Buffalo residents travel per day and the mean number of miles that Boston residentstravel per day is 88.

b. The critical value of t at 95% confidence level and DoF=88 is 1.987

The interval:(x1-x2)+ (critical value* std error)

=3.9-(1.987*1.67),3.9+(1.987*1.67)

Difference between mean=(0.58171,7.21829)

The 95% confidence interval for the difference between the two population means is (0.58171,7.21829)

8 0
2 years ago
Karen rides her bike 4 mi in 20 min. How many miles will she ride in 1 h and 20 min?
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The answer is 84 miles

6 0
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Apply the distributive property to factor out the greatest common factor.<br> 35 + 14 =
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Answer:

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Step-by-step explanation:

The greatest common factor would be 7. So now 35/7 is 5 and 14/7 is 2. Now put it in distributive property! GCF on the outside and the new numbers we just got in the inside. There's your answer! Have a great day! :)

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3 years ago
A student has a test grade of 85%. If the student does extra problems and his grade raises by 15% of the test, what would be the
ruslelena [56]
Yes he is receiving a perfect score now
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3 years ago
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