Pure acid is to be added to a 10% acid solution to obtain 72 l of a 20% acid solution.

what amounts of each should be used?

_l of pure acid solution and _l of 10% acid solution

36

Step-by-step explanation:

because 10 is 1/2 of 20 and 72/2 = 36

__8__ L of pure acid solution and __64__ L of 10% acid solution

option a.

step-by-step explanation:

if you look closely at the graph, we can notice that the function is not defined at two different points.

if you look at functions b and c, you will notice that both functions are not defined at just one point. the function b is not defined at x= -5/2 and function c is not defined at x=-5. both options are discarded, given that our function should not be defined at two fiferent points.

now, if you look closely at the graph you will notice that the function sketched is not defined at x=5 and x=-2.

the correct answer is $7.38

step-by-step explanation: