Answer:
u <= 80
u > 80
Step-by-step explanation:
The happiest would be
Null hypothesis: u <= 80
Alternative hypothesis: u > 80
Answer:
So you pretty much just solved your math by yourself :)
Step-by-step explanation:
Answer: B. x > -9 and x < 9
Step-by-step explanation:
Since, Here,

⇒
(Because,
)
⇒
(Because, a < b ⇒ -a > -b )
⇒ 
⇒ 
Thus, Option B is correct.