Answer: 72
Step-by-step explanation:
From the question, we are informed that a disc jockey can play 7 records and that there are 9 records to select from for a particular segment of a radio show.
The number of ways that the program for the segment be arranged will be:
= 9! / 7!
= (9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1) / (7 × 6 × 5 × 4 × 3 × 2 × 1)
= 9 × 8
= 72
Answer:
4s
Step-by-step explanation:
You can just pretend it's like normal addition and subtraction but with s, so you do -2s - 4s + 10s = -6s + 10s = 4s.
3x +0 can be replaced by 3x because of "the additive identity property of real numbers: anything plus zero is that thing."
Answer:
It will take 6 minutes by Ashley and Emma to read the same amount of pages.
Step-by-step explanation:
Let in 't' minutes Ashley and Emma will read the same amount of pages.
If Ashley can read one page in a minute then she can read the number of pages in t minutes = 1×t =t
If she starts from page 1 then after time 't' she will be at the page = (t + 1)
Similarly, if Emma takes 3 minutes to read the amount of pages = 1
Then she can read amount of pages in t minutes = 
If Emma starts from page 5 then after t minutes she will be at the page = 
If both have read the same amount of pages then,



t = 6 minutes
Therefore, it will take 6 minutes by Ashley and Emma to read the same amount of pages.