28. Which of the following is true regarding the relationship between work and efficiency of a machine? a. Since work output is always less than work input, efficiency is always less than 100% b. Since friction increases work output, friction increases the efficiency of machines. C. Since work input and work output are always equal, efficiency is always 100% d. Since efficiency of a machine is determined by the ratio of work output to work input, the greater difference results in greater efficiency.

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Powerful women's group has claimed that men and women differ in attitudes about sexual discrimination. a group of 50 men (group 1) and 40 women (group 2) were asked if they thought sexual discrimination is a problem in the united states. of those sampled, 11 of the men and 19 of the women did believe that sexual discrimination is a problem. if the p-value turns out to be 0.035 (which is not the real value in this data set), then at = 0.05, you should fail to reject h0. at = 0.04, you should reject h0. at = 0.03, you should reject h0. none of these would be a correct statement.