Pilar is analyzing the frequency table below. find her mistake and correct it

15 people live at a distance less than or equal to 1.5 miles from school

Step-by-step explanation:

It seems that in the intervals shown the interval limits are included.

That is, in the interval 1.1-1.5 miles, there may be values that are equal to 1.5 miles or equal to 1.1 miles.

The sum of the frequencies for the first three intervals, ranging from 0.1 to 1.5 miles, results in a frequency of 15.

Pilar concluded that 15 people live less than 1.5 miles away. His mistake is that he forgot that 1.5 miles is included in the interval, and therefore among these 15 people there may be someone who lives at 1.5 miles.

His conclusion should have been the following.

15 people live at a distance less than or equal to 1.5 miles from school

(x3 + 6x2 + 2x - 6) • (x - 1)

step-by-step explanation:

polynomial long division :

3.2     polynomial long division

dividing :   x4+5x3-4x2-8x+6

                              ("dividend")

by         :     x-1     ("divisor")

dividend     x4   +   5x3   -   4x2   -   8x   +   6

- divisor   * x3     x4   -   x3            

remainder         6x3   -   4x2   -   8x   +   6

- divisor   * 6x2         6x3   -   6x2        

remainder             2x2   -   8x   +   6

- divisor   * 2x1             2x2   -   2x    

remainder               -   6x   +   6

- divisor   * -6x0               -   6x   +   6

remainder                     0

quotient :   x3+6x2+2x-6   remainder:   0

25% is the answer