For the imaginary number i, what's the value of i? If it's real, just type the real
number. If it's a pure imaginary number, just type the imaginary part, like i or-i or
7i

9514 1404 393

  40.5 ft

Step-by-step explanation:

Solve for the time at which the balls meet, then find the corresponding height.

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The balls will meet at the height such that the two values of h are the same.

  -16t^2 +56t = h = -16t^2 +156t -248

  0 = 100t -248

  t = 2.48

Using the first equation to find h, we have ...

  h = t(-16t +56) = 2.48(-16·2.48 +56) = 40.4736

The balls meet at a height of about 40.5 feet.