Points a and b are represented in this drawing to a scale 1 cm : 5 km. work out the actual distance between them

Witch represents the inverse of the function f(x)=1/4x-12

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?

What is the value of the product (3-2i)(3+2i)?