The coast-down time y for a car as it drops 10 mph from an initial speed x depends on several factors, such as average drag, tire
pressure, and whether the transmission is in neutral. The table gives coast-down time in seconds for a car under standard
conditions for selected speeds in miles per hour. Answer the following questions.
Initial speed (in mph) Coast-down time(in seconds) Initial speed (in mph) Coast-down time(in seconds)
30
30
50
17
35
26
55
40
22
60
45
19
65
10T
30
70
IUT
30
70
....
IUT
30
15
14
13
70
IUT
30
Use a quadratic regression feature of a graphing calculator to find the quadratic function g that best fits the data.
g(x)=x²-x+
(Round to four decimal places as needed.)
70