This is for band! why does a musical staff sometimes have ledger lines written above or below? a. ledger lines are used to make the musical staff wider b. ledger lines are used to shorten the musical staff. c. ledger lines are used to spread open the musical staff. d. ledger lines are used to extend musical staff. why do you think your answer is correct?

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b

How do you work out 21.3-8= show your working. plz

Ineed so much with both of these tot