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May
22
comment Ice Cream Sundae
Can the scoops be the same? In that case, you have $$15 \times 15$$ choices for the ice cream. If the scoops must be different, you have $$15 \times 14$$ (which is "15 choose 2").
May
22
comment Exact value of sin (θ/2) if cos θ = 3/5
Surely the sine and cosine aren't the same...
May
21
awarded  Favorite Question
May
21
comment Functions - Algebra
@Rex, the third and fourth answers will be expressions in terms of x (so not "just" a number),
May
21
answered How to determine if the set of vectors are linearly dependent or independent
May
21
comment Identification of a quadrilateral as a trapezoid, rectangle, or square
@WoJ - indeed, I don't usually say "this shape is a square/rect/rhombus", but rather "this shape has the properties of such...".
May
21
comment Polynomials and Commutativity
g,h are each either the inverse of f (which we can calculate if needed), or the identity, right?
May
21
comment Identification of a quadrilateral as a trapezoid, rectangle, or square
@woj under 13 yrs
May
21
revised Identification of a quadrilateral as a trapezoid, rectangle, or square
rolled back to a previous revision
May
21
awarded  Great Question
May
20
awarded  Notable Question
May
20
awarded  Popular Question
May
20
awarded  Good Question
May
20
comment Identification of a quadrilateral as a trapezoid, rectangle, or square
@daniel, that question is speculative at best! If the teacher didn't create the problem, then my immediate concern is still with the teacher (and not the creator). That they would insist on a wrong answer is the point of this post.
May
19
awarded  Nice Question
May
19
revised Identification of a quadrilateral as a trapezoid, rectangle, or square
added 1 character in body
May
19
comment Identification of a quadrilateral as a trapezoid, rectangle, or square
Right, and I showed this to my student yesterday. I'm wondering if the class is just at that place where, if you draw [what kids call a square], then it's a square.
May
19
asked Identification of a quadrilateral as a trapezoid, rectangle, or square
Apr
14
comment Possible solutions of a diophantine equation: $p^2+pq+275p+10q=2008$
Ah yes. It's been a while since I've had to make use of a/the trick =)
Apr
13
comment Possible solutions of a diophantine equation: $p^2+pq+275p+10q=2008$
$(7,2)$? $$$$$$$$