its b. hope this helps i guess
Combine like terms to get
Answer:132
Step-by-step explanation:
Answer:
yintercept: (0,3) or 3
x intercept: (-4,0) or -4
Step-by-step explanation:
The y intercept is what you get when x=0
.75*0+3
3
The x intercept is what you get when y=0
0=.75x+3
-3=.75x
-4=x
Answer:
We need at least 217 compact fluorescent light bulbs
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so 
Now, find M as such

In which
is the standard deviation of the population and n is the size of the sample.
How many compact fluorescent light bulbs need to be selected?
We need at least n bulbs, in which n is found when 
So







We need at least 217 compact fluorescent light bulbs