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liberstina [14]

3 years ago

8

Jon starts walking at noon at a speed of 3 miles per hour. Lili leaves the same place two hours later and walks in the same dire

ction at a speed of 4 miles per hour. What time will Lili catch up with Jon?

1 answer:

Goryan [66]3 years ago

3 0

Answer:

4:00

Step-by-step explanation:

DID THE MATH

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A Cepheid variable star is a star whose brightness alternately increases and decreases. For a certain star, the interval between

fomenos

Answer:

0.41 (correct to 2 decimal place)

Step-by-step explanation:

If $B(t)=4.0+0.35sin\frac{2\pi t }{5.4}$

Let $u=\frac{2\pi t }{5.4}$ , then $B(u)=4.0+0.35sin u$

We want to determine the rate of increase $\frac{dB}{dt}$ after one day

$du=\frac{2\pi dt }{5.4}$ and $\frac{dB}{du} =0.35cos u$

$\frac{dB}{dt}=\frac{2\pi }{5.4}0.35cos (\frac{2\pi t }{5.4})=0.407cos (\frac{2\pi t }{5.4})$

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Rate of increase after one day, i.e. t=1

$B^{'} (1)=0.407cos (\frac{2\pi X 1 }{5.4})$ = 0.407 =0.41 (correct to 2 decimal place)

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Step-by-step explanation:

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