On a trip, a student drove 40 miles per hour for
2 hours and then drove 30 miles per hour for
3 hours. what is the student's average rate of
speed, in miles per hour, for the whole trip?

Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units