Li designed a survey to determine how comfortable students at her middle school are with fractions. there are 600 students in her middle school. the students are equally distributed among grade levels. she selected a sample of 28 students in her first-period class. which best explains li’s sample?
a. random and biased
b. random and unbiased
c. nonrandom and biased
d. nonrandom and unbiased

C. nonrandom and biased

Step-by-step explanation:

In random sampling, there should be no pattern when designing a sample, but Li selected a sample in her first-period class. This means that Li's sample is not random.

Since 28 is too smaller than 600, the rest of the students can have different thinking from the her first -period class students. Therefore the sample must be biased.  

Therefore, option C is correct the sample explained by Li is non random and biased.

answer: b. f(x) = (x + 2)^3 (x^2 - 7x + 3)^4

step-by-step explanation:

polynomials always have as many roots as their order. this is a 4th order polynomial- hence 4 roots!

complex roots of polynomials always come in pairs. the quadratic equation has the "+/-" in that will alwaysgenerate m+ni amd m-ni, so 7-2i must be a root of this polynomial equation.

the order of the numerator and denominator are both 2. so the horizontal asymptote is y=a2/b2 =7

verticle asymptotes are the forbidden x-values. f(x) becomes undefined at x=-3 because this value will cause a zero denominator.

a graph of r(x) will have vertical asymptotes at ±1 because these values will make the denominator zero. so the domain of the function cannot include ±1.

you 're wlecome! : )

cretdit to source