830$ there are 52 weeks in a year. 52 times 15 is 780. 780 plus 50 is 830
Answer: (you can solve it using vertical angles, supplementary angles, and same side interior angles)
140/7=20. Which means they charge $20 per car.
60*20=$1200
Answer:

Step-by-step explanation:
Let total number of students
Students went to the book fair:
Students went to book fair
Students who bought book:

Hence
of total students bought at least one book.