Clints text message plan charges a monthly flat rate of $3.75 and $0.15 per message sent/received. Question: How much is Clint charged if he sent/received 210 text messages this month?
What equation can you write to represent the word problem (before plugging in the 210)

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