kob3965
06.04.2020 •
Mathematics
W(t)W, left parenthesis, t, right parenthesis models the daily water level (in \text{cm}cmstart text, c, m, end text) at a pond in Arizona, ttt days after the hottest day of the year. Here, ttt is entered in radians. W(t) = 15\cos\left(\dfrac{2\pi}{365}t\right) + 43W(t)=15cos( 365 2π t)+43W, left parenthesis, t, right parenthesis, equals, 15, cosine, left parenthesis, start fraction, 2, pi, divided by, 365, end fraction, t, right parenthesis, plus, 43 What is the first time after the hottest day of the year that the water level is 30 \text{ cm}30 cm30, start text, space, c, m, end text? Round your final answer to the nearest whole day.
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Ответ:
t=152 days (in radians)
Step-by-step explanation:
W(t)models the daily water level at a pond in Arizona, t days after the hottest day of the year. (t is entered in radian)
We want to determine the first time,t at which the water level is 30cm.
When W(t)=30
Ответ:
Answer-
A. strong negative correlation.
Solution-
Direction of a relationship
Positive- If one variable increases, the other tends to also increase. If one decreases, the other tends to also. It is represented by positive numbers(i.e 0 to 1). Negative- If one variable increases, the other tends to decrease, and vice-versa. It is represented by negative numbers(i.e 0 to -1)Strength of a relationship
Perfect Relationship- When two variables are linearly related, the correlation coefficient is either 1 or -1. They are said to be perfectly linearly related, either positively or negatively. No relationship- When two variables have no relationship at all, their correlation is 0.As in this case, correlation coefficient was found to be -0.91, which is negative and close to -1, so it is a strong negative correlation.