exam Maths Puzzle Numerical Ability

PRofit: the yearly profit P for a widget producer is a function of the number n of widgets sold.The formula is P= -180 + 100n -4n^2.
Here P is measured in thousands of dollars, n

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exam Other Question

Find a25 for thearitmetic sequence 1/2,1/5,-1,10,... An object will fall m feet in n seconds where m = 16nsquared. How long will it
take for a quarter to hit the ground if it is dropped from
the top of a tower that is 1454 feet tall?