Answer:
a. is effective for use in school research.
Step-by-step explanation:
Cluster sampling is the sampling whereby we pick random few sample from the population to serve as the sample population called cluster. This cluster usually have uniform characteristics among them.
The main advantage of cluster sampling is that it is effective school research because of its cheapness and doesn't require much resources during the sampling process.
The other options are not correct because Cluster sampling have High sampling error and its biased sample.
Answer:
x-3
Step-by-step explanation:
<span>8.66666666666. I'm not sure if there are any more 6's.</span>
7. For this one, we need an equation. Lets make x = the price of the computer. Since the price of the printer is 30% the price of the computer, we can make that .3x, because a number multiplied by .3 will give you 30% of your original number. So, our equation will be:

Since x is the cost of the computer, you have your answer right there. The computer costs $2,028.
8. For this one we're going to need a proportion, but first we need to find out how much of the percentage of seeds Cliff planted.
% of seeds planted per person:
Ali - 40
Ben - 45
Cliff - x
All percentages add up to 100, so we'll make an equation to figure this out:

Therefore, Cliff planted 15% of the seeds. Since Cliff planted 15% of the seeds, and he planted 87 total, 15% of our total number of seeds planted is 87. We can now make a proportion to figure out how many seedlings were planted all together.

We can now cross multiply in order to get a solvable equation:

The total number of seedlings planted was 580.
Sorry if this is confusing at all, hope I helped!
Answer:
642.96 ft
Step-by-step explanation:
first building 423 feet tall, that is 100% --> 423 ft
next building 100% + 52% = 152%
second building: so now we multiply (423 * 152%) or ( 423 * 152/100 )
answer is 642.96 ft