Given these reactions and their corresponding ΔG° values,

Glucose + phosphate → glucose-6-phosphate + H2O; ΔG° = +13.13 kJ

ATP + H2O → ADP + phosphate; ΔG° = -32.22 kJ

What is the calculated ΔG° for the coupled reaction

Glucose + ATP → glucose 6-phosphate + ADP

Add equation 1 to equation 2 and check to see that gives the equation you want. Then add dGo values.