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kherson [118]
3 years ago
11

Hands of a clock suggest an angle whose measure is continually changing. How many degrees does a minute hand move through during

each time interval?
9 min
35 min
45 min
Please explain i need help!
Mathematics
1 answer:
Arte-miy333 [17]3 years ago
8 0
A clock has sixty minutes for every one rotation. One full rotation has 360°. Knowing this, we can set up a ratio:
\frac{60min}{360} = \frac{6min}{36} =  \frac{1min}{6}
So, for every 1 minute, a clock hand moves 6°.

Next, all we have to do is multiply the number of minutes by 6°:
9min*6degrees=54degrees \\ 35min*6degrees= 210degrees \\ 45min*6degrees=270degrees

So:
In 9 minutes, a clock-hand moves 54°
In 35 minutes, a clock-hand moves 210°
In 45 minutes, a clock-hand moves 270°

Hope this helps!
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Step-by-step explanation:

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Rich is comparing the cost of maintaing his car with the depreciating value of the car. When will the cost and value be the same
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Complete question:

Rich is comparing the cost of maintaining his car with the depreciation value of the car.

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Answer:

9 years

Step-by-step explanation:

Depreciation is modeled by an exponential function :

A = p(1 - r)^t [decrease, '-']

A = 20,000(1 - 0.15)^t

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Log (1.28 / 0.85)^t = log 40

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t = 9.01

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