# Posts by elis

Total # Posts: 4

**chem**

a mixture of NaBr & NaCl has a mass of 2g & found to contain 0.75g of Na. What is the mass of NaBr in the mixture?

*July 19, 2011*

**math**

differentiate y=(x)^(1/2)e^(-x).i need the calculation work. [ans: -x^(1/2)e^(-x) + 1/2(x^-1/2)e^(-x)]

*July 19, 2011*

**math**

differentiate y=-4x^2cos x. i need to know the calculation work. (ans: 4x^2sinx - 8xcosx)

*July 19, 2011*

**phy**

You pull upward on a stuffed suitcase with a force of 150 N, and it accelerates upward at 0.760 m/s^2. 1-What is the mass of the suitcase? 2-What is the weight of the suitcase?

*July 18, 2011*

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