Can someone please help with this

Use the grouping method to factor x^3+ x^2 + 3x +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.

What is (28 + 7 + 6 + 3) x 1/2 show your work