80 points if you answer this question! an artifact was found to have an original amount of carbon-14 of 12 grams. approximately how many grams of carbon-14 remain after 5000 years? carbon 14 decays at a rate of -0.00012 grams per year. a. 6.6 grams b. 7.1 grams c. 10.4 grams d. 11.2 grams

Carbon 14 decays at a rate of -0.00012 grams per year

after 5000 years, 5000*0.00012 = 0.6 grams are lost from decay

An artifact was found to have an original amount of Carbon-14 of 12 grams.

after 5000 years, 12-0.6 = 11.4 grams of C-14 remains.

5+2x=a

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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!