The Definition of Porcentage is given by:
Where Vx is discounted value or increased, and Vt is total value. The discount decreases the "p" value.

If you notice any mistake in my english, please let me know, because i am not native.
Given that the function is given by:
f(x)=2x+x
when x=3, then:
f(3)=2(3)+3
f(3)=6+3
f(3)=9
b] The zero of the function will be given by:
f(x)=2x+x=3x
When x=0 then f(x)=0, hence the zero of the function will be at x=0
Answer:
y=-7+5x
Step-by-step explanation:
(0,2)