Yes, is subtraction, to get their "difference".
first off, let's convert the mixed fractions, to "improper", and then subtract.

It’s a positive correlation I’m pretty sure.
Answer:Alex earned $12
John earned $36
Step-by-step explanation:
j=3a
a+3a=48
4a=48
a=48/4
a=12
j=36
Answer:
B
Step-by-step explanation:
Given that ;
f(x)= x³
f(x)-4 = x³- 4
See attached graph using the graph tool