What is the value of r in the equation 3r − 6 = 18?

6
8
18
24

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?

How do i take any fraction and make it into a decimal or percentage?

Through which points should a line of rotation be placed to create a cylinder with a radius of 3 units