John is 5 years older than Sam and the product of their ages is 300. How old is Sam ?

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

Find an equation of the line perpendicular to the graph.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie