book Maths Puzzle Numerical Ability

The Set of numbers A={2,3,4,5} and an operations called *. Results for * are given below

* 2 3 4 5
---------------
2| 3 2 3 4
3| 2 3 4 5
4| 3

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book Other Question

fireworks are launched over a lake from a dam 32ft. above the water. The height of a display, t seconds after it is launched, is given by
h(t)=-16t^2+16t+32. After how long wil
Furst of all, thank you for all the recent help-I think I may be getting this, but, of course, something else has come up and has stopped me. May I ask for help with this?:
in sol