Answer:
f(3) means x = 3, substitute for x as 3 :
9
Step-by-step explanation:
f(3) = 2(3) + 3
= 9
80 degrees
the sides add upp to 180 degrees so 180-70-30=80
A-5 A-5 AND A-4 A-5
A-10 AND A-1
Hope it helps you
The answer is 6cm