Answer:
x=7
Step-by-step explanation:
7 times 3 =21 and 21 times 1 =21 cross multiply or butterfly method
f(5) means to replace x in the equation with 5 then solve.
f(x) = x^2 +2x
f(5) = 5^2 + 2(5)
f(5) = 25 +10
f(5) = 35
The answer is D)35
So I can show you on a piece of paper
It’s reflections
Hope this helps *smiles*
11. you do 3x3=9 then plus 9+2 = 12 then 12 x 12 = 144
sorry idk 10.