Answer:
Step-by-step explanation:
given curve y= x^2-4x+3
differentiate wrt x to get gradient,
dy/dx = 2x-4
2a-4= -1
a= 3/2
Distance = Average speed * Time = 48*10 = 480 miles
So, they drove for 480 miles
Answer: 1. $499
2. $270.48