Can you answer those 2 questions please?!thank you

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

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field