Will Mark brainliest I really need help with these 2 problems I’ve been stuck on them for a while, can you please help?

What are the percent by mass of copper in penny lab

Asap! will give brainiest when a heat wave strikes a region causing more people to run air-conditioning units, electrical demand increases. what needs to be done to meet this increased demand? raising the control rodslowering the control rodsremoving the control rods

If i add water to oil what will happen