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llama1314
19.02.2021 •
Mathematics
Find the percent change from the first value to the second. 40;72 (show how you got your answer for a brainliest)
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Ответ:
80% increase
Step-by-step explanation:
Ответ:
80% increase
Step-by-step explanation:
There are two ways to do this
The first way is to set up a percent proportion
To find x, we can do:
x =![\frac{72 * 100}{40}](/tpl/images/1129/8410/17655.png)
x =![\frac{7200}{40}](/tpl/images/1129/8410/849ae.png)
x = 180
72 is 180% of 40
There is an 80% increase.
The second way to do it (the way I find easier) is to use benchmark fractions:
We look at 40 and 72 and realize that (40 * 2) - 8 = 72
So 200% of 40 - 8 = 72
Then, we find out what percent of 40 is 8.
10% of 40 is 4
so that means 20% of 40 is 8 (10% * 2 = 4 * 2)
Then we do:
80 - 8 = 72
200% - 20% = 180%
72 = 180% of 40
Which is an 80% increase
Let me know if you have any questions
Ответ:
The answer you chose is wrong by the way. The x-value of 1 has two y-values, which breaks the rules of a function, plus you didn't provide a full picture of the question.
Step-by-step explanation: