(8) in 10 years, maria will be 39 years old. let m represent maria's age today. which
equation could be used to find m.
(1) m = 39 + 10 (2) m- 10 = 39 (3) m + 10 = 39 (4) 10m = 39

(3)

Step-by-step explanation:

if Maria is 39 in 10 years and m is her age today then you would have to add 10 to m to get 39

m+10=39 years old

(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