book Maths Puzzle Numerical Ability

please help me solve the following problems.

p(t+1)= -2 solve for t I started off by multiplying.

pt +p1 = -2
pt/P = -2-p/p (/ means fraction)

t = -2-1
t =-3


t

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book Other Question

MCM=.....1900,2000,2100,or none of these? Write in scientific notation.

75,000,000