Mckenna recorded the time it took six children of different ages to run one lap around the track. Using the line of best fit, which is the closest to the length of time it should take Mckenna's 8 year old son to run one lap?

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.

answer: sorry i can't you.

step-by-step explanation:

the 3rd on is correct

step-by-step explanation: