What’s 1\2 x 11\12 i’m sorry this may be an easy question but i just wanted to see if this really works

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

Paco orders an ice cream for $1, but realizes his wallet is at home and he only has 3/20 of $1 with him. if his mom pays the remaining 7/20 of the dollar, how much will she pay? $0.05 $0.15 $0.85 $0.95

Dylan is evaluation the expression 13+19+7+10 at one step in his work, dylan rewrites the equation as 13+7+19+10 which property of addition must dylan have used when he evaluated the expression?