Answer:
It increases
Step-by-step explanation:
Given the expression: 1+3f
When f=1, 1+3f=1+3(1)=1+3=4
When f=2, 1+3f=1+3(2)=1+6=7
When f=3, 1+3f=1+3(3)=1+9=10
When f=10, 1+3f=1+3(10)=1+30=31
We see from the above that when f increases, the value of the expression also increases.