The daily supply of oxygen for a particular multicellular organism is provided by 625 square feet of lawn. A total of 12,500 square feet of lawn would provide the daily supplies of oxygen for how many organisms? The lawn would supply the daily supply of oxygen for __ organisms.

20

Step-by-step explanation:

The daily supply for one is 625 square meters. So, for x amount it is 12500. You can divide 12500 by 625 to get your answer. 20

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional