Answer is C= 52d To solve problems like this, you would just need to think about what the question is asking you one step at a time List what you know - There are 52 cards in each deck - We need how many cards in total
So let us think about it from a mathematical standpoint 1 deck= 52 cards 1 x 52= 52 that means..... 2 deck= 104 cards 2 x 52 = 104 3 deck= 158 cards 3 x 52 = 158 and the list keeps going That means that 52 multiplied by whatever number d is will get you the total number of cards. thus C= 52d