Answer:

Step-by-step explanation:

positive = greater than 0.
Therefore we have the inequality:
|add 7 to both sides

Answer:
b) 24
Step-by-step explanation:
We solve building the Venn's diagram of these sets.
We have that n(S) is the number of succesful students in a classroom.
n(F) is the number of freshmen student in that classroom.
We have that:

In which n(s) are those who are succeful but not freshmen and
are those who are succesful and freshmen.
By the same logic, we also have that:

The union is:

In which



So



So the correct answer is:
b) 24
Divide 384 by 12 then multiply it by 5 to give you 160