Answer:
C = 2d + 15
Step-by-step explanation:
$2 per km, so $40 for 20km.
55-40 is 15 so $15 is a fixed price.
Hence, C = 2d + 15
Answer:
144
Step-by-step explanation:
The equation to find c is:

So put -24 into b:

Which simplifies to:
144
So if you want to test this:
x^2 - 24x + 144
is
(x-12)^2
$50 per day x 6 days = 300
20% = 0.2, times t = 0.2t
The equation would be: f(t) = 300 + 0.2t
I believe it would be <span>f(x)=2x-7</span>
The answer is in the graph.