Plug in f(5) into the equation.
f(x)=1(x)+5+20
Step 1: Plug in 5 to the equation.
Step 2: 1(5)+5+20
Step 3: 1*5+5+20
Step 4: 10+20
Step 5: 30
Step 6: x=30
f(x)=1(x)+5+20
Step 1: Plug in 5 to the equation.
Step 2: 1(5)+5+20
Step 3: 1*5+5+20
Step 4: 10+20
Step 5: 30
Step 6: x=30