Which of the following is a disadvantage to using graphs and diagrams? check all that apply. a. they are always very hard to understand. b. they sometimes give you too much information. c. the information may be in a form that is difficult to use. d. they must always be used with an equation.

C. The information may be in a form that is difficult to use. (Sometimes the graphs and diagrams are so hard to understand. The information provided in the graphs are usually shown in points and its difficult to interpret that sometimes)

D. They must always be used with an equation.(This is true because when there is no equation, how will you derive a graph or how will you understand the diagram purpose)

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!