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Feb
8
asked How to work out family of functions graphs?
Oct
3
comment Counting Methods?
ok! so, let say, if only one men on the committee? there are four man, so there must be 4 choices.so the number of ways to pick one out of 4 men is 4.The other seven committee members must be women, and there are 3 way to pick. so the total number of ways of picking 1 out 4 men and 4 out of 7 women candidate is $7*3=21$ ? but the answer is 140
Oct
3
comment Counting Methods?
2) I can't get the answer 7
Oct
2
comment Counting Methods?
+1 great answer. thx! Looking forward help! God bless you!
Oct
2
accepted Counting Methods?
Oct
2
comment Counting Methods?
Yea.I don't know about "n choose k". Can you please elaborate more? I appreciate it. Sorry for my lack knowledge.
Oct
2
comment Counting Methods?
1) 2 ways to choose- because there is only 11, so if you choose 2 times it is 10. Do you mean like this? thx
Oct
2
asked Counting Methods?
Sep
30
comment equation of the tangent to the following curves?
sorry! how do you get $y=-4x-(-4)(-1)+8$ ?
Sep
30
comment equation of the tangent to the following curves?
fantastic answer! Thanks alot. Sorry for my bad question. Now I fully understood~ thx @AméricoTavares
Sep
30
accepted equation of the tangent to the following curves?
Sep
29
revised equation of the tangent to the following curves?
added 23 characters in body
Sep
29
comment equation of the tangent to the following curves?
1. $2x-2$ but i don't know 2?
Sep
29
comment equation of the tangent to the following curves?
can you please explain in a step? thx~ @J.M.
Sep
29
asked equation of the tangent to the following curves?
Sep
29
comment differentiation of Polynomials
thx! for that @ArturoMagidin I will not use next time!
Sep
29
awarded  Supporter
Sep
29
accepted differentiation of Polynomials
Sep
29
comment differentiation of Polynomials
ok! I understood now <br> $2x^3-4x$ <br> $= 6x^2-4$
Sep
29
comment differentiation of Polynomials
but the answer is $6x^3-4$