I need you to read the answer and explain why it's 400 because I don't know why it's 400

What is the binomial expansion of (2x-3)^5

Student price tickets to a movie are $1 and non student tickets are $2. 350 tickets are sold and the total amount made is $450. how many non student tickets were sold ? a) 100 b) 150 c) 200 d)250

Will mark name all segments skew to bc