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3 years ago

Which expression is equivalent to 0.2n + 2n + 4?

Mathematics

2 answers:

ycow [4]3 years ago

7 0

0.2n + 2n + 4
(0.2n + 2n) + 4
2.2n + 4

Zarrin [17]3 years ago

6 0

Answer:

2.2n+4

Step-by-step explanation:

0.2n + 2n +4

The above expression is an algebraic expression . since coefficient 0.2 and 2 have same product n value, they can be added .

0.2n + 2n = 2.2n

finally, the expression is

2.2n + 4

From the option above

2.2n + 4 is equivalent to 0.2n + 2n +4

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4 years ago

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Step-by-step explanation:

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3 years ago

Read 2 more answers

Two planes left simultaneously from the same airport and headed in the same direction towards another airport 3600 km away. The

ExtremeBDS [4]

Answer:

800 kph
600 kph

Step-by-step explanation:

Equation

Let s represent the speed of the faster plane. Then its travel time is ...

time = distance/speed = 3600/s

travel time for the slower plane is ...

time = distance/speed = 3600/(s -200)

The difference in these times is 1.5 hours, so we have ...

3600/(s -200) -3600/s = 1.5

Solution

Multiplying by (2/3)s(s -200), we get ...

2400(s) -2400(s -200) = s(s -200)

s^2 -200s -480000 = 0 . . . . . . . . . . rewrite in standard form

(s -800)(s +600) = 0 . . . . . . . . . . . . . factor

The positive value of s that makes a factor zero is s = 800.

Conclusion

The speed of the faster plane was 800 km/h; of the slower plane, 600 km/h.

_____

Check

The travel time for the faster plane was 3600/800 = 4.5 hours. For the slower plane, 3600/600 = 6 hours, a difference of 1.5 hours.

6 0

3 years ago