Answer:
Option A. These two lines are perpendicular
Step-by-step explanation:
we know that
If two lines are parallel, then their slopes are equal
If two lines are perpendicular, then their slopes are opposite reciprocal (the product of their slopes is equal to -1)
step 1
Convert the given equation A in slope intercept form

where
m is the slope
b is the y-intercept
we have
----> equation A
Solve for y
That means----> isolate the variable y
Divide by 3 both sides

so

step 2
Convert the given equation B in slope intercept form

where
m is the slope
b is the y-intercept
we have
----> equation B
Solve for y
That means----> isolate the variable y
subtract 3x both sides
Divide by 2 both sides

so

step 3
Compare the slopes


The slopes are opposite reciprocal (the product is equal to -1)
therefore
These two lines are perpendicular
Hi,
The answer you are looking for is x= -3.
Have a great day!!
Answer:
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.

The lower end of the interval is the sample mean subtracted by M. So it is 1000 - 1.96 = 998.04 mm
The upper end of the interval is the sample mean added to M. So it is 1000 + 1.96 = 1001.96 mm
Answer:
14.63
Step-by-step explanation: