Which of the rolling equations have exactly one solutions ? ps: (click the picture to see answer choices)

All have exactly one solution

Step-by-step explanation:

a) -13x + 12 = 13x - 13

   +13x         +13x

          12 = 26x - 13

         +13           +13

           25 = 26x

           26     26

          25/26 = x

b) 12x + 12 = 13x - 12

   -12x          -12x

          12 = x - 12

        +12       +12

            24 = x

c) 12x + 12 = 13x + 12

  -12x          -12x

           12 = x + 12

           0 = x

d) -13x + 12 = 13x + 13

   +13x           +13x

         12 = 26x + 13

        -13             -13

          -1  = 26x

          ---      

          26       26

          -1/26 = x

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!

answer: a) 56% women

b)44% men

step-by-step explanation: