Not sure is this is right but if the chemist wants to make the solution 35% acidic then he can use all of the 30% acid and 5% of the 45% acid.
20+5=25 then 25-4.67=20.33 so then you do 20.33/4.5=4.5 so the cost for one pound of fruit is $4.57. Hope this helps :)
Answer:
It is because the red disks were more than the other disks before the pupils added other disks.
Answer:

Step-by-step explanation:
Hello!
We can solve the quadratic by using the quadratic formula.
Standard form of a quadratic: 
Quadratic Formula: 
Given our Equation: 
Plug the values into the equation and solve.
<h3>Solve</h3>