40 because 15×4 is 60 and there is 60 minutes in an hour
f = twenty bill
f = fifty bill
f + t = 18(gave total 18 bills) and 50f + 20t = 450 ($450 cash a check)
Answer is B.
f + t = 18 ; 50f + 20t = 450
The angle RSV would be 42°
552 is the CORRECT answer!!!
I hope this helps.
Have a awesome day. :)
