Answer:
3
Step-by-step explanation:
If y varies directly with x, we have:

When y=12, x=4
Substituting these values into the equation
12=4k
k=12/4
k=3
The constant of proportionality is 3.
Answer:
180
Step-by-step explanation:
Your question is going to get deleted because " Brainly is about pushing intellectual boundaries "
Step-by-step explanation:
D.the set of all possible output values.
The answer would be 2 times whatever the value of x would be
Since they both have the same variable, you can add them, 5x+9x is 14x