Step-by-step explanation:
Using functions, the input is x, the output is y.
<u>Break down the problem:</u>
The output (y) is (equals) one-fourth (1/4) of the input (x)
y equals 1/4 of x

More cars = more pollution.
<span>More industry buildings = more pollution. </span>
<span>More people = more people breathing carbon dioxide = more pollution</span>
Step-by-step explanation:
40 days = 15 boys
1 day = 15/40 = 3/8
therefore,
30 days = 3/8 × 30
= 11.1/4 boys or 11.25boys
5:12 means there are 17 parts
Percentages are calculated by dividing the part by the total, and multiplying by 100
Julie put in 5 out of 17 parts so:

×100=29.4%
Kristen owns the rest of the business

×100=70.6%
The amount of money doesn't make a difference, as the percentage will always be the same.