Answer:
total amount spent is $96 altogether on tickets
Step-by-step explanation:
Step 1
Derive the expression for the total amount Brendon spent on the tickets as follows;
total amount=cost per ticket×number of tickets bought
where;
cost per ticket=$12
number of tickets Brendon bought=4
replacing;
total amount=(12×4)=48
total amount spent by Brendon=$48
Step 2
Derive the expression for the total amount Ed spent on the tickets as follows;
total amount=cost per ticket×number of tickets bought
where;
cost per ticket=$12
number of tickets Ed bought=4
replacing;
total amount=(12×4)=48
total amount spent by Ed=$48
Step 3
Total amount spent altogether=total amount spent by Ed+total amount spent by Brendon
replacing;
Total amount spent altogether=(48+48)=96
They spent Derive the expression for the total amount Brendon spent on the tickets as follows;
total amount=cost per ticket×number of tickets bought
where;
cost per ticket=$12
number of tickets Brendon bought=4
replacing;
total amount=(12×4)=48
total amount spent is $96 altogether on tickets
. Plugging in 4.7 for your radius, we get 
, which is roughly 29.453π≈92.530.