15. the temperature c, in degrees, that is equivalent to a temperature of f degrees fahrenheit is given by graph of this equation shows the temperature in celsius for the corresponding temperatures in fahrenheit. a. explain how linear equations can be used in temperature conversion. b. explain how could you could use the conversion graph to find the normal body temperature in degrees celsius, which is 98.6°f. 16. peter works part time for 3 hours every day and cindy works part time for 2 hours every day. a. if both of them get $4.50 an hour, write an inequality to compare peter’s and cindy’s earnings. b. what should cindy’s per-hour income be so that she earns at least $14 a day? write an inequality and an explanation of how to solve it. 17. admission prices to cinema i to see a movie are $9.50 for an adult and $6.50 for a child. the admission charge at cinema ii is $8.00 per person regardless of age. a. write an inequality showing that the prices are cheaper at cinema i than at cinema ii. b. if 6 adults and their children go together to see a movie, use the inequality to find how many children must attend for cinema i to be the better deal.