Answer:
There are 15600 ways to pick a password
Step-by-step explanation:
We have 26 possibilities to pick a letter. So, we have 26 possibilities for the first component of the password. The second letter should be different from the first one, so we have one less possibility, giving us a total of 25, and for the third letter we have 24.
This gives us 26*25*24 = 15600 ways of picking a password.
Answer:
$150
Step-by-step explanation:
5 + 10 + 30 + 100 + 5 = 150
Answer:
6554
Step-by-step explanation:
The sequence 2, -8, 32, -128 has a first term (a1) of 2 and a common ratio (r) of -8/2 = -4. The sum of n terms is given by ...
Sn = a1·(r^n -1)/(r -1)
For your sequence, the sum of 7 terms is ...
S7 = 2·((-4)^7 -1)/(-4-1) = 2(-16384/-5) = 6554
The sum of changes after the 7th day is 6554.
Answer:
e = -2
Step-by-step explanation:
9e-7=7e-11
Subtract 7e from both sides
9e-7e -7=7e -7e-11
2e -7 = -11
Add 7 to each side
2e -7+7 = -11+7
2e = -4
Divide each side by 2
2e/2 = -4/2
e =-2