For the following situations, state which type of sampling plan was used. In order to find out how its employees felt about higher student fees imposed by the legislature, a university divided employees in three categories: staff, faculty, and student employees. A random sample was selected from each group and they were telephoned and asked for their opinions. A. Cluster sampling B. Systematic sampling C. Stratified sampling D. Convenience sampling

I think sample B is better.

Step-by-step explanation:

Its more careful and better

the answer to this question is yes

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15