exam Maths Puzzle Numerical Ability

Find a25 for thearitmetic sequence 1/2,1/5,-1,10,...

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In studying the frictional effects on a flywheel, the revolutions per minute R that it makes as a function of the time t (in min) is given by R = 4520(0.750)^2.50t. Find t for R = 1950 r/min 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