Answer:
a)
31.53
31.099
31.009 ⬅ (I'm assuming this one is a decimal too)
b)
0.03
0.009
0.007
Explanation:
Here ya go.
Hope this helps :)
Answer:
90+30=120
180-120=60 this is degree measure
Answer:
We can find the critical value 
And for this case if the confidence increase the critical value increase so then this statement is True
Step-by-step explanation:
For a confidence level given c, we can find the significance level like this:

And with the degrees of freedom given by:
We can find the critical value 
And for this case if the confidence increase the critical value increase so then this statement is True
Recall that an equation in slope-intercept form is as follows:

where m is the slope of the line, and (0,b) is the y-intercept.
Substituting m=-6, and b=-1/2 we get:

Simplifying the above result we get:

Answer:
1.20 + 0.34 = 1.54
That is the answer.