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.

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.

if she was to only spend a dollar she can get 1lb

step-by-step explanation:

correct answer is c. just did it

step-by-step explanation: