Wednesday

October 7, 2015
Total # Posts: 8

**pre-calculus**

proving tht the statements are true for all natural numbers 1+2+3+....+n=n(n+1)/2 i dont understand when trying to prove tht P(k+1) = 1+2+3+...+k+k(k+1)= 1/2 how do you do this step???
*March 3, 2013*

**pre-calculus**

the foci of an ellipse are (0,2) (0,-2) and the eccentricity is 1/2. determine the equation of the ellipse. write your answer in standard form.
*February 26, 2013*

**physics**

a medtech student pushes a 30kg carton of books across the floor of her dormitory by exerting a constant force of 185 N at an angle of 37 degrees with the horizon. If the opposing force of friction is 70 N, how much work does she do as she moves the carton 4 m in 15 s? What ...
*March 2, 2012*

**Chemistry**

A buffer is prepared by mixing 205 mL of .452 M HCl and .500 L of .400 M sodium acetate. Ka =1.80 x 10^-5 I got the pH is 4.79 but i can't figure out the grams of KOH the problem says how many grams of KOH must be added to .500 L of the buffer to change the pH by .125 ...
*November 30, 2010*

**math**

How many different ways can 50 players in a marching band be arranged in rectangle arrangemnts?
*October 7, 2009*

**CHEMISTRY**

what is the product of: 1. acetic acid + copper(II) sulfate 2. potassium phosphate + ammonium chloride 3. chromium(III) nitrate + ammonia(aqueous) please help me!
*March 3, 2009*

**chemistry**

is it C?
*February 4, 2008*

**Science**

What is the current in the 30-ohm heating coil of a coffee maker that operates on a 120-volt circuit? Would be 120/30?
*October 27, 2007*

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