book Maths Puzzle Numerical Ability

how do you find the area of a rectangle on a coordinate plane?

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book Other Question

h=192+64t-16t^2 tells the height in feet of a stone t seconds after it is thrown from the top of the building.
a.) what is the height of the stone after three seconds?
b.) At wha Evaluation the expression for the given value of the variable:

1. 8a when a=4

2. c+15 when c=12.5