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
Answer:
94.8
Step-by-step explanation:
94.8 is the answer for 1st q
Answer:
ab= 7.8
ac= 6
bc=5
Step-by-step explanation:
Answer:
21 ft²
Step-by-step explanation:
3*5 + 2*3 = 21
Basically, it's saying make y=x by simplifying.
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