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27lcasselberry
28.02.2020 •
Mathematics
A Cepheid variable star is a star whose brightness alternately increases and decreases. For a certain star, the interval between times of maximum brightness is 3.8 days. The average brightness of this star is 2.0 and its brightness changes by ±0.35. In view of these data, the brightness of the star at time t, where t is measured in days, has been modeled by the function
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Ответ:
0.41 (correct to 2 decimal place)
Step-by-step explanation:
If![B(t)=4.0+0.35sin\frac{2\pi t }{5.4}](/tpl/images/0527/8174/2c10b.png)
Let
, then ![B(u)=4.0+0.35sin u](/tpl/images/0527/8174/47f4b.png)
We want to determine the rate of increase
after one day
Rate of increase after one day, i.e. t=1
Ответ:
$19.95 + 5c
Step-by-step explanation:
5c would mean 5 x C