11. In each of the following sets, tell if a. multiplication, b. subtraction, c. division, and d. addition are well-defined operations. If not, give an example to show why not. These are the different sets: {0, 1, 2, 3, 4, ...} .. . {1, 3, 5, 7, ...}

Step-by-step explanation:

{0, 1, 2, 3, 4, ...}  in set #1, addition by 1 , subtraction by -1, multiplication by 1 then addition of 1 or subtraction of -1, and division by one then addition of 1 or subtraction of -1 exist and are all well defined operations, since they yield the same result every time in a constant pattern (there are not the only examples)

{1, 3, 5, 7, ...} in set #2 addition by 2, subtraction by -2, multiplication by 1 then addition of 2 or subtraction of -2, and division by one then addition of 2 or subtraction of -2 exist and are all well defined operations, since they yield the same result every time in a constant pattern (there are not the only examples)

if gloria has "carry over" minutes, (that is, any minutes paid for but not used in a month can be applied to her payment for minutes in the next month,) her total usage for the three months is: total minutes = 320 + 243 + 489 = 1052 minutes number of 200 minute blocks = 1052/200 = 5 r52 (that is 5 with a remainder of 52) rounding up the number of 200 minute blocks gives her usage for the three months as 6 blocks. the cost for six blocks is 6 x $25 = $150 she also has 200 - 52 or 148 carry over minutes if gloria pays each month and unused minutes are lost, applying the rounding up procedure to each month gives: first month usage of 320 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 second month usage of 243 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 third month usage of 489 minutes rounds up to 3 blocks of 200 minutes for a payment of 3 x $25 = $75 total payments for the three months are $50 + $50 + $75 = $175 get the plan with carry over minutes!