Need more help with this mathe problem i dont get it and I'm giving

Find two rational expressions that have the difference of 2-n/n-4

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers