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mart [117]
3 years ago
11

The function

Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
6 0

Answer:

3 seconds.

Step-by-step explanation:

f(t) = height of the disc = -18t^2 + 42t + 36.

This equals zero when it completes its path, so:

-18t^2 + 42t + 36 = 0

-6(3t^2 - 7t - 6) = 0

-6 (3t + 2)(t - 3) = 0

t = 3 seconds  (We ignore the negative zero).


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