Grant plans to evaporate enough water from 22 gallons of a 16% ammonia solution to make a 24% ammonia solution. which equation can he use to find n, the number of gallons of water he should remove?

The equation used to express n is:

i.e.

step-by-step explanation:

initially we are given 22 gallons of solution that has  16% of ammonia solution.

i.e. it has gallons of ammonia.

Now we are asked to find how much gallons of water is to be removed to obtain a 24% ammonia solution i.e. we are asked to find the value of 'n'.

As we have to just remove water that means the amount of ammonia is same in the new solution i.e. in (22-n) gallons mixture.

i.e.

Hence, the equation used to find n, the number of gallons of water he should remove is:

i.e.

sine

step-by-step explanation:

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!