Mrs. kosko left $19.47 on the table in a restaurant after receiving the bill for $16.50. if there was no tax, what percent did she tip? (a) 15% (b) 13% (c) 17% (d) 18%

For a read-a-thon, jay and odhràn each started reading a book at the same time and continued reading for several hours. jay's book had 278 pages, and he read 55 pages per hour. odhràn's book had 238 pages, and he read 45 pages per hour. after how many hours did they have the same number of pages left, and how many pages were left?

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

Two numbers have a sum of -19. one number is x. what expression represents the other number?