Answer:
$6.60 dollars
Step-by-step explanation:
He bought 10 34¢ stamps which means it only costed $3.40, because 10x.34=3.40
So in order to find the change, you subtract $10-$3.40, which equals $6.60
B. 12^3 - 12^2 - 11
........
Answer:-77
Step-by-step explanation:positive plus a negative equal a negative unless the negative is smaller then the number you subtract it from