What is the simplified form of 5 - 4y + 2x - 3y - 2 + 5x?
a. 3 - 7y + 7x
b. 3 + 7y + 7x
c. 7 + 7y + 7x
d. 3 - y + 7x
show steps pls!

(a)

(b) The best  point estimate of is the sample mean

The margin of error =  4.552

Step-by-step explanation:

Given : The confidence interval for the population mean =  (13.046 , 22.15)

Sample mean :

Standard deviation :

Sample size :

a. Let represents the population mean.

Then we can write the confidence interval for the population mean as :-

b. The best  point estimate of is the sample mean

Also, the lower limit of confidence interval can be written as

i.e.

Hence, the margin of error =  4.552