James decided to share his rock collection with his friends. He gave 13 to George, 18 to Sharon, and 15 to Mark. He had 32 left. How many rocks did he have to start with?

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In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)