Y=-4+3x is different because all others have a negative 4 AND a -3x
The base of a cone is a circle.
The area of a circle is

.
Thus, the area of the base of a cone

.
The derivation of the formula for the area of a circle involves a bit of calculus, but if you'd like, I can walk you through it.
You would count on.
I hope i am right
The first one is similar to the triangle
Answer:74.04
Step-by-step explanation: