Answer:
I believe 21 cm
Step-by-step explanation:
This involves quite a lot of arithmetic to do manually.
The first thing you do is to make the first number in row 2 = to 0.
This is done by R2 = -3/2 R1 + R2
so the matrix becomes
( 2 1 1) ( -3 )
( 0 -13/2 3/2) (1/2 )
(5 -1 2) (-2)
Next step is to make the 5 in row 5 = 0
then the -1 must become zero
You aim for the form
( 1 0 0) (x)
(0 1 0) (y)
(0 0 1) ( z)
x , y and z will be the required solutions.
Answer:
-1 is the only answer that is greater than -5
Answer: Choice C
Closed filled in circle at -3; shading to the right.
========================================================
Explanation:
Follow the steps shown below to isolate x. Note that the inequality sign flips when we divide both sides by a negative number.

Here's another way to isolate x

The inequality sign flip happens much earlier when we go from the format of
to
(in step 3)
The graph of this will have a closed filled in circle at -3, then shading to the right to describe all values -3 or larger.
This is why we go for choice C.
Answer:
The Line p
y= 3/4x+ 6.25
Step-by-step explanation:
The points given changed 4 right and 3 up, giving a slope of .75
plug this slope into (1,7) to get the y-intercept. This shows the intercept at 6.25.