17. Elizabeth asked 40 students at her school to name the first kind of pet they ever had. She made the circle graph below to display the responses.

How many more students owned dogs than cats as their first pets?

Possible Answers:

A: 3

B: 7

C: 9

D: 12

Please give me some minor explanation.

Find the sum of the following series. round to the nearest hundredth if necessary.

Rachel reads 1/5 of the pages of a book plus 12 pages on the first day. on the second day, she reads 1/4 of the remaining pages plus 15 pages. on the third day, she reads 1/3 of the remaining pages plus 18 pages. on the fourth day, she reads the remaining 70 pages. how many total pages are in the book?

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.