An equation is said to have a constant of proportionality if 'x' is a multiple of 'y' or 'y' is a multiple of 'x'.
Now, we have to determine an equation with constant of proportionality as '1'.
1.
This equation has constant of proportionality as ''.
2.
This equation has constant of proportionality as ''.
3.
This equation has constant of proportionality as ''.
4.
This equation has constant of proportionality as '1'.
Option D is the correct answer.
This is subtraction property of equality.
Answer:B)
Amount after 15 years = 6700( 1 + 0.046/2)^(2*15) = 13,253.90
Only 20%of earths water is useable
Changed both of them to a fraction