The difference between 100 and 75 is 25.
Answer:
B.64 miles
Step-by-step explanation:
Let Oliver's be x
Let Stephanie's be y

substitute for x in (b):

find x in (a):

(9,-4) you have to plugin 9 to the equation in the form of x. Then you add 5 and that would be your y value
Answer:
Because the kind of compounfds that you try to determine using paper chromatography (organic compounds) are usually not soluble in water. Furthermore, water could react chemically with some of this compounds, because it's a very reactive molecule. You need organic solvents that are mostly inert.