100 points
why did it take just six weeks for a keelboat to float down the mississippi to new orleans but four months to make the return trip?

a. keelboats carried a much heavier load on the return trip.

b. the return trip was upstream, against the flow of the river.

c. a keelboat's steam engine worked better with the wind than against it

d. once the goods had been delivered to new orleans, there was no hurry to get home.

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

Acar travels 40m in 8 seconds find the car speed