Answer:
16,244.55
Step-by-step explanation:
Original cost of piano = 19,100
19% off on 19,100 = 0.19*19100 = 3,629
Selling cost = 19100 - 3629 = 15471
Sales tax = 5% =0.05
Amount of sales tax = 0.05*15471 = 773.55
Total selling cost of piano = Selling cost + Amount of sales tax = 15471 + 773.55 = 16,244.55
The graph of the function
is
- concave upward, when

- concave downward, when

Find 
1.
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2.

Now:
1. when
the graph of the function is concave upward and this is for
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2. when
the graph of the function is concave downward and this is for

4x-8=3x+9, I think that's the answer
True because there are songs that have peotry
the domain: no real numbers so its negative infinity, positive infinity