Answer:
9
Step-by-step explanation:
Y intercept when x = 0
Y = 9
Answer: 
Step-by-step explanation:
Since we have given that
A very large study showed that aspirin reduced the rate of heart attacks by 44%.
we claim that they have a drug that will be more effective than aspirin.
so, our hypothesis would be

So, it will be one tail test.
Hence, 
Answer:
17
Step-by-step explanation:
x+3x+x-7=78
5x-7=78
5x=78+7
5x=85
x=85/5
x=17
Answer:
Question 20 3 < c < 9
Question 21 2.5
Step-by-step explanation:
hope this helps u