Answer:
<em>19800 seconds, or 330 minutes, or 5 hours + 30 minutes</em>
Step-by-step explanation:
<u>Number Permutations</u>
We know the phone number has 7 digits, 4 of which are known by Mark. This leaves him 3 digits to guess with. We also know the last one is not zero. The number can be represented as
XXY
Where X can be any digit from 0 to 9 and Y can be any digit from 1 to 9. The first two can be combined in 10x10 ways, and the last one can be of 9 ways, this gives us 10x10x9 = 900 possible permutations.
If each possible number takes him 22 seconds, every possibility will need
22x900=19800 seconds, or 330 minutes, or 5 hours + 30 minutes
For this case we have the following expression:
Rewriting the expression we have:
We apply distributive property to the terms of parentheses:
Answer:
if i understand this correctly the question is asking if the cook did it correct and i believe he did
Answer:
28
Step-by-step explanation:
(-1)(-7)(4)
(7)(4)
28
Answer:
7²
Step-by-step explanation:
