Explain the place value relationship when the same two digits are next to each other in a multi-digit number

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Which of the following are accepted without proof in a logical system? check all that apply.