Use inverse operations to write the inverse of each equation. f(x)=x+3​

You have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint? you have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint?

Don't know how to find x given these segment lengths

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?