Find the area if a rectangle with a length of x+1 and a width of x+3

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.

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

If the scale factor between two circles is 2x/5y what is the ratio of their areas?