The next greatest common factor of (GCF) of x2, x3, x9, _​

Can someone me out here number 4 plz

Select all the expressions that will include a remainder.

The temperature of a chemical solution is originally 21 ? c . a chemist heats the solution at a constant rate, and the temperature of the solution 75 ? c after 1212 12 minutes of heating. the temperature, tt t , of the solution in ? c is a function of x , the heating time in minutes. write the function's formula.