Answer:
s = 
Step-by-step explanation:

so:


A = 60
Therefore:
s = 
By 4 becuase this will change the -4y to -16y , then adding the 2 equations will eliminate y.
D
Answer:
399/1234
Step-by-step explanation:
The relative frequency is the fraction (ratio) of sophomores to total students.
There are 399 sophomores, and 1234 total students.
So, the relative frequency is 399/1234