Challenge. a chemist has a solution that is 20% peroxide and another solution
that is 70% peroxide. she wishes to make 100 l of a solution that is
35% peroxide. how much of each solution should she use?

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step-by-step explanation:

answer: i think it's a

step-by-step explanation:

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.

answer:

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21  

-7 + ? = 21

-7 + 28 = 21

hope it