What is the value of the expression below?

-4(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?

If y varies as x, and y=8 as x=4 what will be the value of y if x=2

What is the range of the inverse of the given function f(x)=√x-2