I don't know what you are talking about please re word the question its really hard to understand what your asking.
Answer:
90-90.000 or 90-100
Step-by-step explanation:
The meaning of the area is the measurement of a surface in this case a circle, which can be find by using the formula

, where
r is equal to the radius of the circle.
In this exercise is given that the diameter of a standard cardboard is 18 inches or a radius of 9 inches and it is asked to find its area. Therefore, to find the area of the circle you should substitute the value of the radius into the previous mention formula.



The area of the standard dartboard is 254.47 square inches or 254 square inches.
Answer:
First derivative the equation
39x²-318x-412=0
then use the quadratic formula
then x = 9.29 or x = -1.14