Kim traveled 2x+50 miles on Monday and 3x-10 miles on Tuesday. Write a polynominal that represents the total distance traveled in 2 days and find the total distance if x=20? What is the systematic...

Kim traveled 2x+50 miles on Monday and 3x-10 miles on Tuesday. Write a polynominal that represents the total distance traveled in 2 days and find the total distance if x=20?
What is the systematic name of Mg(NO3)2, NH4ClO3, and PbO and how do you get those answers