Answer:
16π
Step-by-step explanation:
Circumference = 2πr. Since the radius, r, is unknown, we can get it from the area.
Area = πr² = 64π ;
Divide both sides by π. We are left with
r² = 64; To find r, take square root of both sides
Therefore, r = √64 = 8m;
Circumference = 2×π×8 = 16πm
Two sixths and three fourths
Step-by-step explanation:
As far as I understand, they can use all 26 letters (alphabet) and all 10 digits (0, 1, ..., 9), and the password looks like this:
letter-letter-letter-letter-letter-letter-number-number (6 letters, 2 numbers).
▪︎ They can reuse the letters, so they can choose the 1st letter out of 26 possible letters, then they still can choose the 2nd letter out of 26 (it's ok if they have both A's for example, they can reuse them) and so on. So each time they can choose one letter out of 26. Thus, it's 26*26*26*26*26*26.
▪︎ The same thing with numbers. Each time they can choose one number out of 10, so it's 10*10.
▪︎ Therefore, the answer is 26*26*26*26*26*26*10*10 = 30,891,577,600. That's almost 31 billion passwords.
Answer:
Hey 2923928 !
<u>Answer</u><u>:</u><u> </u><u>The</u><u> </u><u>second</u><u> </u><u>choice</u>
• from distributive property;
• simplify: