SOLUTION: Can you help me out with this!!! if x=1 is the day tickets go on sale. Tickets= -0.4^2+20x+122.1 b. What is the number of tickets sold on the 10th day? The 20th day? The 40t

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Can you help me out with this!!! if x=1 is the day tickets go on sale. Tickets= -0.4^2+20x+122.1 b. What is the number of tickets sold on the 10th day? The 20th day? The 40t      Log On


   

Question 368302: Can you help me out with this!!!
if x=1 is the day tickets go on sale.
Tickets= -0.4^2+20x+122.1

b. What is the number of tickets sold on the 10th day? The 20th day? The 40th day? The 50th day?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
T%28x%29=+-0.4x%5E2%2B20x%2B122.1
Just substitute for x with the number of days.
I'll do one you do the rest.
For x=10,
T%2810%29=+-0.4%2810%29%5E2%2B20%2810%29%2B122.1
T%2810%29=+-0.4%28100%29%2B200%2B122.1
T%2810%29=+-40%2B222.1
T%2810%29=182.1
Since you can't sell 0.1 of a ticket, on the 10th day, 182 tickets were sold.
Follow the same process for x=20, x=40, and x=50.