18 is 75! this is the answer to 18
Perimeter = sum of all 3 sides in a triangle
so
x + x - 4 + 12= 26
answer
B. <span>x + x - 4 + 12 = 26</span>
Answer:
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The
<u>correct answer</u> is:
Matthew's rate is higher by $50 per month.
Explanation:
We know that Christopher's rate is $550 per month.
To find Matthew's rate, we will treat the data we have as ordered pairs:
(3, 1800)
(6, 3600)
(9, 5400)
We find the slope of the line between these points. The formula for slope is:
![m=\frac{y_2-y_1}{x_2-x_1}](https://tex.z-dn.net/?f=m%3D%5Cfrac%7By_2-y_1%7D%7Bx_2-x_1%7D)
Using the first two points, we have:
![m=\frac{3600-1800}{6-3}=\frac{1800}{3}=600](https://tex.z-dn.net/?f=m%3D%5Cfrac%7B3600-1800%7D%7B6-3%7D%3D%5Cfrac%7B1800%7D%7B3%7D%3D600)
To verify Matthew saves the same amount each month, we will find the slope between the second two points and make sure they're the same:
![m=\frac{5400-3600}{9-6}=\frac{1800}{3}=600](https://tex.z-dn.net/?f=m%3D%5Cfrac%7B5400-3600%7D%7B9-6%7D%3D%5Cfrac%7B1800%7D%7B3%7D%3D600)
Matthew's rate is $600 per month.
This is higher than Christopher's by 600-550=$50 per month.