$117/1.9= $61.578 rounds to $61.60
$61.60 is the price before tax.
Answer:
f(10) means to input x = 10 into the function.
From inspection of the given function:

the "10" is the numerator of the fraction.
Therefore, swap the "10" for "x" to give the function in terms of x:

Answer:
y= - 3/4x + 13/2(8.5,0)(0,6.5)
rounded (9,0)(0,7)