in 4 minutes it changed 8 feet
so 8/4 =2 feet per minute change
and since it dropped it would be a negative change so -2 feet per minute
Answer: A and D
Step-by-step explanation:28 x 43=860
20 x 3=60
860-60=800
20 x 40=800
all of this equals 860
Using the Empirical Rule, it is found that there is a 68% probability that a student scored between 66 and 82.
<h3>What does the Empirical Rule state?</h3>
It states that, for a normally distributed random variable:
- Approximately 68% of the measures are within 1 standard deviation of the mean.
- Approximately 95% of the measures are within 2 standard deviations of the mean.
- Approximately 99.7% of the measures are within 3 standard deviations of the mean.
In this problem, considering the mean of 74 and the standard deviation of 8, we have that:
74 - 8 = 66
74 + 8 = 82.
Hence, there is a 68% probability that a student scored between 66 and 82.
More can be learned about the Empirical Rule at brainly.com/question/24537145
Answer:
A. square root -4
Step-by-step explanation:
The answer is A because the square root of -4 is 2i which is an imaginary number.
-The square root of -4 is 2i (an imaginary number)
-The square root of 16 is 4
-The square root of 1 is 1
-The square root of 13 is ≈ 3.606
Subtract 469 from 576
576
-469
--------
107