Afarmer has 100 gallons of a solution that is 70% disinfectant. he wishes to mix it with a solution that is 90% disinfectant to make a 75% disinfectant solution. how much of the 90% disinfectant solution must he use?

where did you get them? if you picked from the grass, is is probably poisonous.

step-by-step explanation:

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0

graph b

step-by-step explanation:

one solution- graph a (clear intercepting point.)

no solution- graph b (they're parallel, there will never be a point of interception.)

infinite solutions- graph c (all points intercept.)