Casio CLASSPAD II Quick Reference Manual page 13

Numerical Solve
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To compute the second value for t, enter an initial
estimate, say 4, for t and tap .
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2. If a ball is tossed upwards from an initial height of
120 feet, and has height of 160 feet after 2 seconds,
compute the initial velocity.
Enter the values of 160, 2, and 120, select the bullet
for v and tap .
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Getting Started with the Classpad II 13