raiindrxp
18.07.2019 •
Mathematics
How much pure water must be mixed with 10 liters of a 25% acid solution to reduce it to a 10% acid solution?
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Ответ:
you need that 2.5 liters to be 10%, or 1/10th the total.
the total would have to be 25 liters (2.5 x 10) so when you add to 10 to get 25 you get 15 liters. Hope I helped!
Ответ:
Do you mean: 7*3^x or (7*3)^x? For the first one, 7*3^x is not equal to 21^x because 7* (3^x) is not the same as 21^x. Now, this may sound confusing, so let's give x a value. If x = 2, then the expression would be 7* (3^2), which is 7*9, and that's not the same as 21^2 (42).