Mr. Dionne is the band director at school. He asked students to record how long they have played an instrument. The dot plot shows data he has recorded. What unit of measure is used in the study?

A. Number of observations

B. Number of instruments

C. Number of students

D. Years

19.side- angle- side

20. angle- side- angle

step-by-step explanation:

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.

yes the data was not prsented

step-by-step explanation: