M=y2-y1/x2-x1
m=-4-1/1-2
m=-5/-1
m=5
B
B. -5
F(-1)=2x-3
=2(-1)-3
=-2-3
=-5
Answer:
8 square inches
Step-by-step explanation:
The formula for are is A=wl if we plug our numbers in we have A=4x2=8 In other terms we now know A=8
Answer:
He will need 4 newborns in the sample to be 95% confident.
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 the margin of error M as such

In which
is the standard deviation of the population and n is the length of the sample.
So:





He will need 4 newborns in the sample to be 95% confident.