Question 4 In chemistry, the pH of a substance is a measure of its acidity. The relationship between the hydrogen ion concentration in moles per liter, and p. the pH, is described by the equation below.
C= 10-P
A chemistry student has determined that the hydrogen ion concentration of vinegar is 0.00631 moles per liter. Which is closest to the pH of vinegar?
А
0.45
B
0.99
с
220
5.07

2/3x + 7 = 29

step-by-step explanation:

two thirds = 2/3

plus a number = x

at least 29 = 29

there for you should get 2/3x + 7 = 29

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

i believe the answer is c.