Answer:
x = 1
y = -1
z = 2
Step-by-step explanation:
You have the following system of equations:
First, you can subtract euqation (3) to equation (1):
x + 2y - z = -3
<u>-x +y -z = - 4 </u>
0 3y -2z = -7 (4)
Next, you can multiply equation (3) by 2 and subtract it to equation (2):
2[ x -y + z = 4]
<u> -2x +y -z = -5</u>
0 -y + z= 3 (5)
You multiply equation (5) by 2 and sum (5) with (4):
2[ -y + z = 3]
<u> 3y -2z= -7</u>
y + 0 = -1
Then y = -1
Next, you replace y=-1 in (5) to obtain z:
-(-1) + z = 3
z = 2
Finally, you can replace z and y in the equation (3) to obtain x:
x - (-1) + (2) = 4
x = 1
Answer
6.9473
Step-by-step explanation:
We should find the mean number of the tests.
This would be done like: (23+24+25)/3 = 24
After that, you should find the percentage or fraction like this 24/50
Then use the fraction as an estimate like this:
(24/50) * 3250 = 1560
The correct answer is 1560.
Answer:
7.2units
Step-by-step explanation:
Answer:
The average rate of change is 2.
Step-by-step explanation:
We are given the function:
And we want to find the average rate of change over the interval:
The average rate of change is synonymous with the slope. So, we will evaluate the function at its endpoints and find the slope between them.
Our first endpoint is given by:
And our second endpoint is given by:
This gives us two points (-4, -15) and (3, -1). The average rate of change will be the slope between them. Thus:
The average rate of change is 2.
