Doreen Schmidt is a chemist. She needs to prepare 32 ounces of a 13% hydrochloric acid solution. Find the amount of 16% solution and the amount of 8% solution she should mix to get this solution.

She should mix 20 ounces of 16% solution and 12 ounces of 8% solution.

Step-by-step explanation:

Given:

Doreen Schmidt needs to prepare 32 ounces of a 13% hydrochloric acid solution.

Now, to find the amount she should mix of 16% solution and of 8% solution.

Let the 16% solution amount be

And let the 8% solution amount be

So, the total ounces of solution:

.......(1)

Now, to solve the equation to get the solution she should mix:

Substituting the value of from equation (1) we get:

Subtracting both sides by 2.56 we get:

Dividing both sides by 0.08 we get:

The 16% solution amount = 20 ounces.

Now, substituting the value of in equation (1) we get:

The 8% solution amount = 12 ounces.

Therefore, she should mix 20 ounces of 16% solution and 12 ounces of 8% solution.

10a^3+277a^2-132a-792

step-by-step explanation:

(2a+11)(5a-12)(foil)

=10a^2-24a+55a-132 =10a^2+31a-132

(10a^2+31a-132)(a+6)

=10a^3+60a^2+31a^2+186a^2-132a-792 =10a^3+277a^2-132a-792

i hope this is what you are looking for : )

answer: i believe its b. if you sound out the sentences that sounds wrong.