As a probe descends to the Kuril Trench in the Pacific Occan, it records the amount of dissolved oxygen in the water in units of parts per million (ppm). At depths below 2, 000 meters, the dissolved oxygen drops at a constant rate of d ppm for every change in depth of 100 meters, until it reaches zero. At a depth of 2,530 eters, the dissolved oxygen is measured to be 205 ppm. At a depth of 3, 030 meters, the dissolved oxygen is measured to be 65 ppm. What is the value of d?

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

a - base

b - exponent

so,

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

happy to

pls mark as brainliest.

6 cm

step-by-step explanation: