Answer:
Step-by-step explanation
By using midpoint formula :
(X,Y) = (X1+X2/2) ,(Y1+Y2/2)
Answer:
16 students got an A
Step-by-step explanation:
Set up an equation to compare the ratio to the scores:

Cross multiply:
80 = 5x
Divide each side by 5:
x = 16
Now, check if 
16/8 = 2
40/8 = 5
The ratios are the same! Therefore, 16 students got an A!
Hope this helps! Feel free to contact me if you have any questions :)
He will only need to sell one
Answer:
$15.6
Step-by-step explanation:
Based on the given information, it is $15.6. However, it never specified how many hours she works a day and how many days of the week she works, so we must assume it is just 624/40.