How much pressure is exerted by a sample of gas at 85.0 °C if the same volume exerts a pressure of 1.00 atmospheres at a temperature of 20.0 °C? I'm pretty sure this is a Combined law question but not so sure, I have other questions with other laws but I am mostly stuck on the Combined Laws.
I'm not the best at mathematics so can someone please lead me in the right direction for these, it would be greatly appreciated, thanks :)

The answer is d for this question

Electron equations of the given changes are as follow,a)                              cu      →      cu⁺²  + 2e⁻b)                              mg⁺²  +  2 e⁻      →      mgc)                              cl⁻    →      cl  +  1e⁻d)                              s  +  2 e⁻    →      s²⁻e)                                o²⁻      →      o  +  2 e⁻f)                              p  +  3 e⁻    →      p³⁻g)                              fe²⁺    →      fe³⁺  + 1 e⁻h)                              s²⁻    →      s⁴⁺  +  6 e⁻

The answer is a, because fossil fuels are burned to make energy, hence the geo (thermal) name.hope this !