Can you me with 19 20 and 21 and explain it

What is the y-intercept of the graph of the equation y=3(2^x)

Find the values of y: 3y^3(y^2+ 2/3y)=0

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