Answer:
I would say A because the real answer is 23.477
Step-by-step explanation:
1. Graph: a) positive:x>1
b)negative: x<1
c) increasing : none
d ) decreasing: x ∈ R\ { 1 }
2. a) positive: x < -2
b) negative: x > -2
c) increasing: x ∈ R\ { -2 }
d ) decreasing: none.
3. a) positive: x ∈ R\{ 0 }
b ) negative: none
c ) increasing: x< 0
d ) decreasing: x> 0
Draw your own diagram: in the attachment.
Answer: 
Step-by-step explanation:
1. To solve this problem substitute the values of 
and 
into the function 
and prove for the value 
.
2. When , 
and 
; this means that the graph of the function should cut in the axis 
, if this does not happen, the values of and are not the right ones.
3. Then, we conclude that the correct option is the Option A:
4. You can see that the function cut the y-axis at -3.
1/x = 1/2 That's what you got with your equation. So far so good. That does not tell you what x is though. You have go just a bit further.
1/x = 1/2 Cross multiply
x = 1 * 2
x = 2 It takes 2 hours to complete with all three machines working.
