Since Marco has $1.31 in his coin bank and he spends 87c to buy a pen, the amount taht will be left with him after he buys the pen will be gotten by subtracting 87cents from $1.31.
Note that 100 cents = $1
Therefore, $1.31 will be = 100 × 1.31 = 131 cents.
True because it possible in anyway to get 6 and 1 if you roll a dice they not saying two of them they just saying 1 number cube so its a big chance that you can get 1 and 6