There are 40 volunteers for the research study on the power pill. each subgroup of the study will contain 10 participants. determine how many ways these participants can be selected and explain your method.

To form first group of 10 participants you have ways. After that only 30 volunteers left and to form second group of 10 participants you have ways. After forming second group 20 volunteers left and to form third group of 10 participants you have ways. At last, 10 volunteers left and to form fourth group of 10 participants you have ways.

Use product rule to count the total number of possible ways:

54.864 meters

step-by-step explanation:

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!