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3 years ago

E is the midpoint of DF. IF DE = x + 5 and DF = 3x + 2, what is DF?

Mathematics

2 answers:

suter [353]3 years ago

8 0

Answer:

Step-by-step explanation:

If E is the midpoint, Then DE = FE

=> x+5 = 3x+2

=> 3x-x = 5-2

=> 2x = 3

=> x = 3/2

Now DF:

=> 3/2 + 5 + 3(3/2)+2

=> (3+10)/2 + (9+4)/2

=> (13+13)/2

=> 26/2

=> 13

prisoha [69]3 years ago

6 0

Answer:

Step-by-step explanation:

x+5=3x+2

5=2x+2

3=2x

x=1.5

1.5+5=6.5

6.5 is half of DF, DF=13

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3 years ago

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____________________________________________________________

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3 years ago

A space shuttle travels at 2.6 x 10,000 feet per second. An hour is 3.6 x 1,000 seconds. This expression can be used to find the

guapka [62]

Answer:

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Step-by-step explanation:

From the question,

s = d/t................. Equation 1

Where s = speed of the space shuttle, d = distance traveled by the shuttle in an hour, t = time taken to travel the distance

make d the subject of the equation,

d = s×t.................... Equation 2

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Substitute these values into equation 2

d = (2.6×10000)/(3.6×1000)

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