Answer:

Step-by-step explanation:

Hello!
First you have to find the differences in the prices
The only difference is that your friend signed up for $30 and you signed up for $50
This means that the lines would be parallel and your cost will be $20 higher than your friends
The answer is $20
Hope this helps!
25.12 if this is wrong I’m sorry
Answer:
d. 0.80
Step-by-step explanation:
The given regression equation is
y=0.6x+188
Here, slope=b=0.6
xbar=420, sx=80, ybar=440 and sy=60.
As we know that when y=a+bx, the slope is
b=r(sy/sx)
From this equation we can find correlation coefficient r
b*sx=r*sy
bsx/sy=r
r=0.6*80/60=48/60=0.80.
Hence the correlation coefficient r=0.8.
55x+35=y. 55 per hour times the number of hours (x) plus 35 for the inspection gives you the total cost (y)