Need help with Math Q and the population of a colon, want quick answer please asap

Need help with Math Q and the population of a colon, want quick answer please asap

In 1998 the population of a colon is 10000 and is decreasing exponentially at 1.5% per year. What will the population be in 5 years? In what year will there be half the population left? 
In 2003 the population of a city is 80000 people and is growing at a rate of 4% per year. What will the population be in 2015. In what year will the population be triple? 
Find the sum of the first 70 terms of the arithmetic sequence: 22,19,16,13
Find the exact sum of the infinite geometric sequence a (1/2), (-1/4),(1/8)
Use the binomial theorem to write the following terms in simplest form 
Find the first four terms of the expansion of (2x-(y/2))^8

Find the inverse for the following function y=3-4x
ALL WORK MUST BE SHOWN

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