Okay, we can use the functions in parts 3 and 4 since we want to calculate how many points will be deducted for 3 falls and how many points are earned for 4 seconds on the rail trick.
Part 3 function:
[tex]\sf y=1.6x[/tex]
He fell 3 times, so plug this in for 'x':
[tex]\sf y=1.6(3)[/tex]
Multiply:
[tex]\sf y=4.8[/tex]
So he will receive a 4.8 point deduction for falling 3 times.
Part 4 function:
[tex]\sf y=7x+10[/tex]
Where 'x' is the seconds he does the trick. He did it for 4 seconds, so let's plug that in for 'x':
[tex]\sf y=7(4)+10[/tex]
Multiply:
[tex]\sf y=28+10[/tex]
Add:
[tex]\sf y=38[/tex]
So he will receive 38 points for the 4-second rail trick.
