<p>Why don't we stay in the present time?
To prove Pythagorean theorem all you need is paper, pencil, ruler, and scissors.
Is it an SAT level question?</p>
<p>It will be by then lol (maybe they meant 2002, though it's more AMC style than SAT)</p>
<p>odd...gcf101 gets post#101...</p>
<p>so...am I right? and is there a way around it that doesn't involve number theory?</p>
<p>Is the answer to the triangle problem 60?</p>
<p>abcde is a five digit number such that a<b<c<d<e.
How many number of this kind exist?</p>
<p>an infinite amount of numbers of this kind....</p>
<p>o oops... my bad
its 5:
12345 23456 34567 45678 56789</p>
<p>tanonev, 101 is odd.</p>
<p>assuming A does not equal 0:
126</p>
<p>think of it this way:
9 digits, take 5 of them, arrange them in increasing order (which means each set has only one arrangement)
C(5, 9) [or C(9, 5)? I never did any formal probability]</p>
<p>@orrican, you didn't include 12346, 12347, 13579, etc.</p>
<p>m and n are positive integers.
m^2 - n^2 = 45
How namy pairs (m,n) exist?</p>
<p>I think 3:
(23, 22), (9, 6), (7, 2)</p>
<p>I found 3- (m,n):</p>
<p>(23,22)
(9,6)
(7,2)</p>
<p>Im pretty sure thats it.</p>
<p>How many real solutions does
(x-1)(x-2)(x-3)(x-4) = 15
have?</p>
<p>Two:</p>
<p>x=.2087
x=4.791</p>
<p>This doesn't sound very SATish though...</p>
<p>My bad.
Got carried away.</p>
<p>In how many zeroes does 99! end?</p>
<p>What is the last digit of the 2005 digit number
122333444455555666666...... ?</p>
<p>Here's a question from the 10 Reals:</p>
<p>If x - 3 < 2 and y + 1 < -3, then the value of x + y could be</p>
<p>(A) 0
(B) 1
(C) 2
(D) 4
(E) 8</p>
<p>The answer is 0... but I have no idea how to get that answer. Someone help please?</p>
<p>add the inequalities...</p>
<p>x - 3 < 2
y + 1 <-3</p>
<hr>
<p>x + y -2 < -1
x + y < 1 when solve and the only choice that is less than 1 is 0</p>
<p>The smallest angle of n-sided convex polygon is 120 degrees.
Its angle measurements follow the pattern 120,125,130,135, ... degrees.
Find n.</p>