Can someone please answer my question? i have been working on school work all day. here is 30 points just please answer all my questions that i post and i will give more

Write the sum, and then write an equivalent expression by collecting like terms and removing parentheses.

b. 2x - 7 and the opposite of 2x

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?

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.