I'm confused. Isn't the question asking how much the store spent on writing pads? So, they made an inital purchase of 250 writing pads, which had cost the store $0.75 each plus an additional purchase (the only other one). So they want the total of the two purchases. A) Gives the number of additional...

Yes - I think it's A. A) p-q>n If both p and q is positive no matter what numbers you choose it will prove that n is less than both. For example, p = 3 and q = 5 so p-q=-2 which is greater than n so n would have to be less than -2 Likewise if p = 5 and q = 3 the difference is 2 so 2>n so n would hav...

What if you have two integers? The question stem said only even number of integers.

Let's say (-1,10) or (-5,5) then you would have a negative median, no?

1) x(x-1) = 20

2) 2^9

Explanation:

1. 3^X – 3^(X-1)= 162 then x(x-1) =


Factor: 3^(x-1)*(3-1) = 162

3^(x-1)(2) = 162

Divid 2 by both sides:

3^(x-1) = 81

Solve for x - 3^4 = 81. So x would be 5 and 5*4=20

2. 2+2+22+23+24+25+26+27+28
Again simplify = 2^9

Just want to confirm that the answer is 66% based on the weighted average method. 1 and 2 are not sufficient so if we combine:

G-----------------Avg----------------U
40 20

U/G = 40/20 = 4/2 = 4/6 or 66%

But why wouldn't 4 work as well. If m = 2 that could be divisible by 4 and same if m = 3

Another way to do these types of questions is the formula: 2*S1*S2/S1+S2 = Average speed where S1 is the speed of the first trip and S2 is the speed of the second trip. This only works when the distance is split equally between the trips and there are no stops. I find this way to be much quicker.