Answer: 
Step-by-step explanation:
(a) Given
Sam charge $5 for each dog for a thirty minute walk
For an hour which is double the thirty minutes, it must be double of the same charge.
(b)Given
With $20, Christie sells 100 cups of lemonade with a quarter per cup charge
For 100 cup, she generate a revenue of
So, she earns 
that is , her profit is 
Answer:
9,000
Step-by-step explanation:
To find where the second derivative of the function changes sign, from negative to positive, or vice-versa. So, we find the second derivative of the given function.
B.26.00 Because if you divide 127.90 by 5 you will 25.58 and you round that up to 26.00
<span><span><span><span>I think it equals 12<span>x3</span></span>−<span>28<span>x2</span></span></span>−<span>21x</span></span>+<span>30
hope this helps!
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