Math (check answers)

posted by Sasha

Since the opening night, attendance at Play A has
increased steadily, while attendance at Play B first rose and then fell.
Equations modeling the daily attendance y at each play are shown below,
where x is the number of days since the opening night. On what day(S)
was the attendance the same at both plays? what was the attendance?

Play A: y = 16x + 150
Play B: y = -x^2 60x - 10

answer choices:

A)The attendance was the same on day 40. The attendance was 790 at both plays that day.
B)The attendance was the same on day 4. The attendance was 214 at both plays that day.
C)The attendance was the same on days 4 and 40. The attendance at both plays on those days was 214 and 790 respectively.****
D)The attendance was never the same at both plays.

My answer is C. Is that correct?

  1. Reiny

    correct , see

    http://www.wolframalpha.com/input/?i=plot+y+%3D+16x+%2B+150%2C+y+%3D+-x%5E2+%2B60x+-+10

  2. Sasha

    Oh great! Thank you so much!

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