Answer:
The answer is $180
Step-by-step explanation:
10% = 0.10
.10 x 1800 = 180
Answer:
Step-by-step explanation:
Let x = the original number of books
Then 0.375x = the total number of biographies
and 0.20 x = the original number of biographies

This creates a cone! :) the formula for volume of it is 1/3 pi R^2 (h) just in case!
24.5 should be the missing number. 13.5 (13 1/2) + 5.5 is 19. 19 + 5.5 is *24.5*. 24.5 + 5.5 is 30. Basically, you go up by 5.5 every number.