The table shows the number of hours spent practicing singing each week in three samples of 10 randomly selected chorus members. Which statement is most accurate based on the data?

A). A prediction based on the data is reliable because the means of

the samples are close together.

B). A prediction based on the data is reliable because each sample

has 10 data points.

C). A prediction based on the data is not completely reliable, because

the means are not the same.

D.) A prediction based on the data is not completely reliable, because

the means of samples 1 and 2 are greater than 9 and the mean of

sample 3 is less than 9.

B

Step-by-step explanation:

I took the Quiz

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.

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft