1) the arithmertic mean and the geometric mean of two positive integers are 5 and 4 respectively, Find the two integers.
2) in a geometric sequence, T(2) x T(5) = 243 and T(4) = 27. Find the general term, T(n),of the sequence.
3) in the begining of a certain year, country A and country B have populations 200000 and 180000 respectively, if the populations of country A and country B are increased by 0.5% and 2% each year respectively, how many year will it take for country B to have a higher population than country A?
4) if x-4, x+4, 4x+4 are in geometric sequence, find the possible values of x.
thank you so much , hope anyone can help me on today ! thanks!