Find the distance and midpoint between the pair of points. A(-1, 0), B(2, -4)

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

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236

Me i’m stuck on all these questions besides the two bottom ones