Answer:
-10
Step-by-step explanation:
Answer:2.744
Step-by-step explanation:
Bye $2?3?3?4?4?4?4?4?!4$4$4&3&3!:??:?:$.!.!/!!/!3!3!3
If the initial time was 60 seconds and 18 seconds have passed,

There would be 42 seconds left.
15. 
Step 1: Distribute the subtraction sign to all the numbers in the second set of parentheses...


Step 2: Combine like terms (
's go with
's)




Step 3: Combine like terms (
's go with
's)




Step 4: Combine like terms (normal numbers go with normal numbers)

1 + 2
3

You were correct!
16. 
I don't really know how to explain this one but I got: (7m-6n)(7m-6n)