A mixed number ? Wouldn't you have to multiply 11 x 6 which equals 66 + 1 = 67 ? Thats how they taught me in elementary school .
Rational, whole, integer, sorry I’m not sure what a natural number is though
C, multiply the powers in the parentheses by 2
$13 x 1.06 = $13.78
The CD costs $13.78 after the tax is added on.
Hope This Helps You!
Good Luck Studying :)