Let eif be the set of all natural numbers ending in 5.that is, eif = {5, 15, 25, 35, 45, 55, 65, 75,.}. describe a one-to-one correspondence between the set of natural numbers and the set of eif.

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?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?