5 cm since a pentagon has 5 sides just multiply one side by 5
1x5=5
Answer:
A 18
Step-by-step explanation:
f(x) = 4x + 10
f(2) = 4(2) + 10
f(2) = 8 + 10
f(2) = 18
it is 6 because there is no other explanation to 1-f f=6!
all i did was look 1 - f = 5 then f equaled 6!