- 1) the population of a country doubles every 20 years. if the population (in millions) of the country was 100 in 2002, what will the population be in 2014?

2) a particle moves along the x axis with a velocity given by v(t)= 2+sint. when t=0 the particle is at x= -2 . where is the particle when t= π (pie)

a)2π b)π c)π-1 d)π-2 e)π+1

3) consider the diff.eq dy/dx=(1-2x)y.if y=10 when x=, find an equation for y.

a) y=e^x-x^2 b)y=10+e^x-x^2 c)y=10e^x-x^2 d)y=x-x^2+10

please show me how to do these..i want to learn