Anonymous4338

I'm sorry Anonymous, but hades is correct. -15 + -100 is, indeed -115. Since you are adding 2 negative numbers, obviously, this would result in another negative number. Anonymous acknowledged that combining 2 negatives equal a positive, but this is only the case in multiplication or division, not addition or subtraction. Since 100+15 is 115, -100+-15 would be -115.

Assuming that each numeral in the code can be repeated, you would do 9 (9 possible numerals) ^ 4 (4 numerals in a code) to get 6561. That means 6561 codes. On the other hand, if numerals can not be repeated in the code, then you would do 9 (9 possible numerals) * 8 (9-1 numerals used is 8 remaining possible numerals) * 7 (8-1) * 6 (7-1) to get 3024 codes.

Sorry your question hasn't been answered yet.

165(2)-164(2)

First, you would multiply each number by the numbers in the parentheses.

165 times 2 minus 164 times 2.

330-328

Then, you just subtract!

2

That means 165(2)-164(2)=2!

An easier way to do this problem is to just do 165-164, and multiply by 2.

Good explanation, Alan. Here is an example for you, TitaniumRome.

If the numbers were 4,5,3,5,4,7,8,1,4, and 10,

then the mean would be (4+5+3+5+4+7+8+1+4+10)/2=25.5.

The median (not mean as Alan accidentally said) would be...

1,3,4,4,4,5,5,7,8,10

4.5 since when crossing out numbers on each side you get 4 and 5, which the average of is 4.5.

The mode is 4 because it appears 3 times, more frequent than any other number.

The range is 9 because the maximum (10) minus he minimum (1) is 9.

Hope this helped! 

I'm going to take a wild guess and say that this person broke their keyboard by slamming on random numbers. 

Good job, saseflower! Good use of proportions and cross-multiplying.

Since 40/400 is 1/10, and 1/10 is equal to 10/100, which is, again, equal to 10%, that means 40 is 10% of 400.

If by 1/5% you mean 1/5 of 1%, which would be equal to 0.2%, multiplying it by 10 would equal 2%. If you mean 1/5 of 100%, 20, 20% times 10 is 200%

Whoops! I accidentally thought that $55 was in need of marking up. Thanks for the correction! 

19. 19, people!