Me! in advance! show work! you so much!

What is 20+(5 x 2/5 )+ 3 show your work

Suppose sat writing scores are normally distributed with a mean of 497 and a standard deviation of 109. a university plans to award scholarships to students whose scores are in the top 2%. what is the minimum score required for the scholarship? round your answer to the nearest whole number, if necessary.

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36