19 13
----- - -----
20 15
You have to find a common denominator (bottom number)
20 x 3 = 60 and 15 x 4 = 60
Then time the numerator (top number) by the same number you multiplied the bottom number by.
19 x 3 = 57 and 13 x 4 = 52
Now you can subtract the numerators while preserving the denominators.
57/60 - 52/60
= 5/60
Then, simplify.
1/12
Answer:
(2 + 8 x^2 - x^3) + (2 x^3 - 3 x^2 + x - 2) - (3 x - 7 x^3 + 5 x^2) = 8 x^3 - 2 x
Step-by-step explanation:
9514 1404 393
Answer:
61
Step-by-step explanation:
If there are 6 coins on each page, then the number of pages for 600 coins is ...
(600 coins)/(6 coins/page) = 100 pages
__
If 39% are empty, then 100% -39% = 61% are filled.
The number of filled pages is ...
61% × 100 = 61/100 × 100 = 61 . . . . pages filled
_____
<em>Comment about percent</em>
You can think of the percent symbol (%) and "per 100" (/100) as being interchangeable. 61% = 61/100
("Cent" is used to signify one of 100 parts. A cent is 1/100 of a dollar, for example. In land area, a cent is 1/100 of an acre. Then, "percent" can be thought of as "per cent" or "per 100 parts".)
