Given the equation 
Check all options:
A. 
, this means that 
Substitute these numbers into the left side of the equation equation:
This option is false.
B. 
, this means that 
Substitute these numbers into the left side of the equation equation:
This option is false.
C. 
, this means that 
Substitute these numbers into the left side of the equation equation:
This option is false.
D. 
, this means that 
Substitute these numbers into the left side of the equation equation:
This option is true.
Answer: correct choice is D.
You could use a calculator.. or if it is already in distributive property then just add it up
Answer:
n = -7
Check:
-4 - 3 + 5 + 4 - 3 + (-7 ÷ -7) = 0
-1 - 7 ÷ -7 = 0
-1 + 1 = 0
0 = 0
Given:
n = 40, sample size
Confidence level = 99% => z* = 2.58
, sample proportion.
By definition, the margin of error is
Answer:
According to Sarah's poll, she can conclude with 99% confidence level that 20% of the high school population is happy with the quality of the cafeteria food, with a margin of error of +/- 16.3%.
This is not the graph of a linear function. The graph of a linear function is a right line. Then it's not option A.
This is the graph of a function, because it passes the vertical line test. Any vertical line that you draw only cuts the function in one point. Then it's not option C.
It's not a one-to-one function because it doesn't pass the horizontal line test. There are horizontal lines that cut the graph in more than one point. Then it's not option D.
Answer: Option B. This is the graph of a function, but it is not one-to-one
