The circumference of a circle is 47.1 feet. what is the diameter of the circle? 7.5 ft 15 ft 147.9 ft 30 ft

B. 15 ft.

Step-by-step explanation:

We have been given that the circumference of a circle is 47.1 feet. We are asked to find the diameter of the circle.

We will use circumference of circle formula to solve our given problem.

Upon substituting the measure of circumference in formula, we will get,

Now, we will divide both sides of our equation by 3.14.

Therefore, the diameter of our given circle is 15 feet and option B is the correct choice.

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.