Joe has some pocket money. he spends 90% of it. he has 50p left. how much pocket money did he have?

What are the steps to solving the inequality 3b + 8 ≥ 14?

Which of the following is not a subset of {1,2,3}?

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