Answer:
the last one? i think.
Step-by-step explanation:
Combine like terms
9r+r=10r^2
7b+b=8b^2
10+10r^2+8b^2+4n
Answer:
D
Step-by-step explanation:
The
confidence interval of a standard deviation is given by:
Given a sample size of 31 charge sales, the degree of freedom is 30 and for 90% confidence interval,
Therefore, the 90% confidence interval for the standard deviation is given by
If you would like to know the average rate in miles per hour, you can calculate this using the following steps:
420 miles ... 210 minutes
x miles = ? ... 1 hour = 60 minutes
420 * 60 = 210 * x
x = 420 * 60 / 210
x = 120 miles
The correct result would be 120 miles per hour.