Advanced Math/Expert Profile

Average Ratings

• Knowledgeability 9.85
• Clarity of Response 9.84
• Timeliness 9.69
• Politeness 9.96

• Number of Questions (in Past 24 Hours) 2
• Max Questions to be Asked (in 24 Hour Period) 2
• Total Questions (since joining AllExperts) 1161
• Volunteer Since 2004-04-19
• Prestige Points 7482

Recent Reviews from Users

Read More Comments

    K = Knowledgeability    C = Clarity of Response    T = Timeliness    P = Politeness

User	Date	K	C	T	P	Comments
katharine	11/06/09	10	9	8	10	ok, thank you so much!! i understand .....
katharine	11/06/09	10	9	8	10	ok, thank you so much!!
Cindy	11/03/09	10	10	10	10	Thank you! Cindy
Cindy	10/30/09	10	10	10	10	Thank you, so much!
Asad	10/27/09	10	10	10	10	Okay. Radical is the sign and (x-1) .....

Recent Answers from Ahmed Salami

2009-11-04 solve for x:

Hi Katharine, 27^x² > 9^x³ (3^3)^x² > (3^2)^x³ 3^(3x²) > 3^(2x³) Now, 3x² > 2x³ 3x² - 2x³ > 0 x²(3x - 2) > 0 Notice here that x² is always positive and so the sign of x²(3x - 2) only depends on

2009-11-01 Trig:

Hi Cindy, Re-arranging the equation by completing the square in y, 9x² + y² + 10y + 16 = 0 9x² + (y² + 10y + 25) - 25 + 16 = 0 9x² + (y² + 10y + 25) = 9 9x² + (y+5)² = 9 x² + (y+5)²/3² = 1 Now,

2009-11-01 exponential equation to linear equation:

Hi Steve, To get the half-life you simply use the equation N = No.e^(-αt) If T is the half-life, then t = T when N = No/2, i.e No/2 = No.e^(-αT) 1/2 = e^(-αT) Taking the natural logarithms

2009-10-31 Prove Identies (Trig):

Hi Jill, d)First, you need to remember the basic identities sin²x + cos²x = 1 sin(x+y) = sinx.cosy + siny.cosx and when x = y sin(x+x) = sinx.cosx + sinx.cosx sin2x = 2sinx.cosx Now, sin(x + π

2009-10-31 exponential equation to linear equation:

Hi Stephen, Well, the new table of values is just one that contains values of lnN and Time t(just as before). In case you're wondering, lnN refers to the natural logarithm of N and you can get all the