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qaws [65]
3 years ago
5

Casey types at a constant speed, as shown in the following table. 1 Word per 5 sec , 2 word per 10 sec , 7 word per 35 sec ,12 w

ord per 60 What does 5 word mean in this situation?
Mathematics
2 answers:
Svetllana [295]3 years ago
7 0

Answer: 5 word per 25 sec

Step-by-step explanation:

1 word per 5 sec + 2 word per 10 sec +2 word +10 sec

dexar [7]3 years ago
3 0

For this case we have the following:

1 word for 5 seconds

2 words for 10 seconds

3 words for 15 seconds

4 words for 20 seconds

5 words for 25 seconds

6 words for 30 seconds

7 words for 35 seconds

and so on, successively, until you reach 12 words in 60 seconds

It is observed, that Casey takes 5 seconds to write a word.

When he has written 5 words, it takes 25 seconds.

Answer:

5 words for 25 seconds

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An airplane flew with the wind for 2.5 hours and returned the same distance against the wind in 3.5 hours. If the cruising speed
KengaRu [80]

Answer:

60 miles per hour.

Step-by-step explanation:

Let r represent speed of wind blowing in miles per hour.          

We have been given that the cruising speed of the plane was a constant 360 mph in air. The speed of the plane is the direction of wind would be 360+r.

The speed of the plane is the opposite direction of wind would be 360-r.

\text{Distance}=\text{Speed}\times \text{Time}

Distance covered in the direction of wind would be 2.5(360+r).

Distance covered in the opposite direction of wind would be 3.5(360-r).

Since both distances are same, so we will get:

2.5(360+r)=3.5(360-r)

900+2.5r=1260-3.5r

900-900+2.5r+3.5r=1260-900-3.5r+3.5r

6r=360

\frac{6r}{6}=\frac{360}{6}

r=60

Therefore, the wind is blowing at a rate of 60 miles per hour.

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(3, 5pi/3) = (3cos 5pi/3, 3sin 5pi/3) = (1.5, -2.6)
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