1. It is the product of a square, meaning it can be simplified to (x+10)(x+10) or (x+10)^2
It's A and C, I've taken a test that has this question and it was correct when I answered this, so A and C is your answer.
Answer:

Step-by-step explanation:
We are given the following in the question:
Sample size, n = 67
Variance = 3.85
We have to find 80% confidence interval for the population variance of the weights.
Degree of freedom = 67 - 1 = 66
Level of significance = 0.2
Chi square critical value for lower tail =

Chi square critical value for upper tail =

80% confidence interval:

Putting values, we get,

Thus, (3.13,4.91) is the required 80% confidence interval for the population variance of the weights.
Answer:
D. 35 + 145 = x
The sum of the angles = 180 degree
Step-by-step explanation:
