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Let m be a positive integer, and suppose that 9 is its own inverse (mod m), but 3 is not its own inverse (mod m). How many values for m are there?
all I did wuz take 30 seconds to think really hard on it and got it. Answer is 13.
Or we could use something like trig, but we don't have the angles to do it fast. Anyway, the midpoint between the two lines is (4,-3). It would be nice if there was an online calculator... but didn't find one. Is there a formula for this problem?
I was working on this problem mentally and got something...probably wrong.
Plz give hints to the problem. It seems easy but it is not.
The points $A\, (5,-5)$ and $B\, (-1,-1)$ are the endpoints of the hypotenuse of an isosceles right triangle $\triangle ABC$. What is the area of $ABC$?
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