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.
Answer:
the slope is negative
Step-by-step explanation:
because they both have negative signs so that would make the line go down
Answer:
the slope is gonna be -1/3 and y intercept is 1
Step-by-step explanation:
Remember you can do anything to an equation as long as you do it to both sides
5c+16.5=13.5+10c
minus 5c both sides
16.5=13.5+5c
minus 13.5 from both sides
3=5c
divide both sides by 5
3/5=c
Answer:

divide each term by two and simplify.
Give me my milf.