Which of the following best describes a benefit of one type of nonrenewable energy? . a. coal deposits are found on nearly every continent and mining coal poses few risks. b. natural gas does not produce greenhouse gases as other energy sources do. c. nuclear power does not produce any form of pollution. d. petroleum is relatively inexpensive compared to other forms of energy.

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.

Asher cycles 12 miles in 16 hours. what is his speed?

In the first law of thermodynamics, triangle e=q-w, what does q stand for