Step-by-step explanation:
two people I hope I could help
So, you basically plug the values into the formula you have been given. D divided by T gives you the average speed.
We know the distance D is 145 miles and the Time T is 2.5 hours.
So, 145/2.5=58
Therefore, the cars average speed was 58 miles / hour
I got 4.3. . . . . . . . . .
Let
. Using Newton's method to approximate a solution to
, we consider the recurrence

Differentiating
gives

Then



which agrees numerically with the actual root of
up to at least 9 digits after the decimal point.