Please help with this. i’m having difficulty understanding

What is 20+(5 x 2/5 )+ 3 show your work

V=x^4-y^4 pick three expressions that can represent the three dimensions of the prism (each in meters)

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.