Answer:
The combined average is 94%
Step-by-step explanation:
for first period, number of students =40
average =96%
for second period, no of students =20
average =90%
but 
let 
=sum of students for the first period
=sum of students for the second period
for first period;
for second period,
therefore the combined average = 
that is 
so combined average is 94%
Answer:
1/2 of a pie.
Step-by-step explanation:
There are 4 people (Emilio and his 3 friends).
If he splits 2 pies to 4 people, our equation is 2/4.
Simplify to 1/2.
B because the other ones are just wrong because when you solve them, you get positive numbers
