To investigate a community’s reading habits, a magazine invites readers to complete and mail in a survey. what is the sampling method?

a. convenience sampling
b. systematic sampling
c. self-selected sampling
d. random sampling

does the sampling method have any bias?

a. yes, because the survey is leading. it suggests that a certain answer is wanted.
b. yes, because the people who respond to the survey may underrepresent the number of readers in the community.
c. no, the sampling method has no bias because part of the population equally represents the entire population.
d. yes, because the people who respond to the survey may overrepresent the number of readers in the community.

A. Yes,because the survey is leading.it suggest that a certain answer is wanted

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1