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Rainbow [258]
3 years ago
9

A truck driver traveled at an average speed of 64 miles per hour on a 200-mile trip to pick up a load of freight. On the return

trip (with the truck fully loaded), the average speed was 38 miles per hour. Find the average speed for the round trip. (Round your answer to one decimal place.)
Mathematics
2 answers:
faltersainse [42]3 years ago
7 0
Average speed for round trip
=total distance/total time
=(200+200 miles)/(200/64+200/38 hours)
=400 miles / (3.125+5.263 hours)
=400 miles / 8.388 hours
= 47.686 miles/hour
Vera_Pavlovna [14]3 years ago
6 0
The answer is 47.6 if you round to the nearest decimal.
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julsineya [31]

Answer:

x = 3

Step-by-step explanation:

4x + 50 + 28 = 90

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x = 3

7 0
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sveta [45]

Answer:

x=2

Step-by-step explanation:

Simplify both sides of the equation.

2x−1−(−x + 3)=6−2x

(Distribute the Negative Sign)

2x−1 + −1(−x + 3)=6−2x

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2x + −1 + x + −3=6 + −2x

(Combine Like Terms)

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3x + −4=−2x + 6

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Add 2x to both sides.

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5x−4 + 4=6 + 4

5x=10

Divide both sides by 5.

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5 0
2 years ago
A 7/16-long bolt is used in a machine.What is the length of the bolt written as a decimal?
babymother [125]
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6 0
3 years ago
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What is the difference between 126 1/4 an 78 2/3
Vaselesa [24]
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8 0
2 years ago
The Director of Admissions at Kinzua University in Nova Scotia estimated the distribution of student admissions for the fall sem
VMariaS [17]

Answer:

Variance = 24900

Standard Deviation = 157.7973        

Step-by-step explanation:

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Number of admissions:    1000     1200    1500

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Formula:

E(x) = \displaystyle\sum x_iP(x_i)\\E(x) = 1000(0.6) + 1200(0.3) + 1500(0.1)\\E(x) = 1110\\E(x^2) =  \displaystyle\sum x_i^2P(x_i)\\E(x^2) = (1000)^2(0.6) + (1200)^2(0.3) + (1500)^2(0.1)\\E(x^2) = 1257000

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\sigma^2 = E(x^2) - (E(x))^2\\\sigma^2 = 1257000 -(1110)^2\\\sigma^2 =24900

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Standard Deviation =

\sigma = \sqrt{\sigma^2} = \sqrt{24900} = 157.7973

Thus, the standard deviation is 157.7973

7 0
3 years ago
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