A chemistry book comprises of two sections: organic and non-organic in the ratio 2:8. How much of each type of content will be needed to make a book of 400
pages?

Write two subtraction equations that are equivalent to 5 + 12 = 17.

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.

What is the total surface area of this square pyramid?