Answer:
234 books.
Step-by-step explanation:
You need to set up a proportion. Be careful to note what it looks like and the explanation that follows.
9 books 13 magazines
======= = ===========
x 572 - x Cross multiply
What you want is the number of book sales from the proportion.
However all you have is the ratio of books to magazines. So you have to set up the total sales to magazines, which is a bit awkward. 572 - x is the number of magazine sales.
9*(572 - x) = 13x Remove the brackets on the left.
5148- 9x = 13x Add 9x to both sides.
5148 = 13x + 9x Transpose and add the right.
22x = 5148 Divide by 22
x = 5148/22
x = 234
234 books were sold.
Answer:
20
Step-by-step explanation:
2 lions with 6 tigers, 4 bears and 8 monkeys
(4ab - 9a - 8) - (7ab - 1)
distribute (multiply) the negative through the parenthesis
<span>(4ab - 9a - 8) - 7ab + 1
No need for other parenthesis because nothing in front or to combine inside. </span>
<span>4ab - 9a - 8 - 7ab + 1
</span>
Combine like terms
- 3ab - 9a - 7
Probability of head occurring on flip of coin twice = 
Step-by-step explanation:
Step 1:
Given,
A coin is flipped 2 times. We need to find probability that head occurs both times
Step 2 :
Probability that a head occurs when a coin is flipped = 
The probability that head occurs when the coin is flipped again =
This is because the 2 events are independent i,e the result of second event is not dependent on happening of the first event
Hence probability that head occurs on both the flip = × =
Step 3 :
Answer :
Probability of head occurring on flip of coin twice =
Answer:
the answer is A
Step-by-step explanation:
