The first 3 rows are proportional
because when you divide the earning by car washed they all have the same unit rate of 9.5/ to answer the second part you multiply 9.5 by 88. you'll get $836
The correct answer is B:2,154
Step-by-step explanation:
I just took the test.
Answer: Option B.
![b=\frac{5}{4}](https://tex.z-dn.net/?f=b%3D%5Cfrac%7B5%7D%7B4%7D)
Step-by-step explanation:
If a varies directly with b then when a increases b it also increases by a factor k.
Then we can write that
![a = kb](https://tex.z-dn.net/?f=a%20%3D%20kb)
We know that when a = 28 then b = 7. So
![28 = k * 7](https://tex.z-dn.net/?f=28%20%3D%20k%20%2A%207)
![k=\frac{28}{7}](https://tex.z-dn.net/?f=k%3D%5Cfrac%7B28%7D%7B7%7D)
![k=4](https://tex.z-dn.net/?f=k%3D4)
Therefore the equation of proportionality is:
![a=4b](https://tex.z-dn.net/?f=a%3D4b)
So when
then:
![5=4b\\\\b=\frac{5}{4}](https://tex.z-dn.net/?f=5%3D4b%5C%5C%5C%5Cb%3D%5Cfrac%7B5%7D%7B4%7D)