Answer:
Turn it upside down
Step-by-step explanation:
Answer: $9.71
Step-by-step explanation: Just subtract the pizza amount (8.50) and the drink (1.79) from the $20.
Answer:
It will take 5 hours until it reaches its maximum concentration.
Step-by-step explanation:
The maximum concentration will happen in t hours. t is found when

In this problem

Applying the quotient derivative formula



A fraction is equal to zero when the numerator is 0. So





We use only positive value.
It will take 5 hours until it reaches its maximum concentration.
Your discriminant is a negative number. Therefore, your solutions are imaginary. It's d from above.
All you have to do is subtract and it'll leave you with the answer $16.01
Hope this helps!