Answer:
f(3) = 70
Step-by-step explanation:
f(x)= 20x+ 10
Let x= 3
f(3)= 20*3+ 10
f(3) = 60+10
=70
Answer: f(x) = 70
f(x) = 20(3) + 10
f(x) = 60 + 10
f(x) = 70
