Answer:
x = 8
Step-by-step explanation:
7x + 2(6x + 9) = 170
2(6x + 9) = 12x + 18
7x + 12x + 18 = 170
19x = 152
152/19 = 8
x = 8
Answer: (110.22, 125.78)
Step-by-step explanation:
The confidence interval for the population mean is given by :-

Given : Sample size = 463


Significance level : 
Critical value : 
We assume that the population is normally distributed.
Now, the 90% confidence interval for the population mean will be :-

Hence, 99% confidence interval for the mean study time of all first-year students = (110.22, 125.78)
Answer:
1/5? 0.2?
Step-by-step explanation:
Answer:
c = bx/(x+1)
Step-by-step explanation:
Add cx to get c-terms together, and divide by the coefficient of c.
bx = cx + c
bx = c(x +1) . . . . factor out c
bx/(x +1) = c
Answer:
-3 ,-4
Step-by-step explanation: