A teacher asked four of her students to write an expression for the problem below. All products in a store are being discounted by 25%. Let x be the original price of a product in the store. What is the sale price of that product in the store? Their responses are shown below:
Joseph: 0.75x
Thomas: 1.25x
Sandra: x - 0.25x
Angela: x + 0.25x
Whose response is correct?
Sandra only
Thomas only
Joseph and Sandra
Thomas and Angela

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.