Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

One of the inventors of integrated circuits observed that the number of transistors that fit on an integrated circuit will double every 24 months. what type of relationship most appropriately models this situation?

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section