Answer:
5/14
Step-by-step explanation:
P(A or B) = P(A) + P(B) − P(A and B)
25/28 = 23/28 + 12/28 − P(A and B)
P(A and B) = 10/28
P(A and B) = 5/14
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 :)
Answer:
359/4
Decimal: 89.75
Step-by-step explanation:
The Answer is 3^6
Just for characters