# urgently

1. ### nCr / nPr Problems... Need help urgently

Please help me with this guys. I'm really struggling in this homework and it is essential to get this extra credit to pass the class. :( Please help... thanks... <3 1. In a poker (a game using the 52-card deck), a flush is a five-card hand where all the cards are the same suit. If there are...
2. ### Need Books urgently

Dear members I need three books about differential Equations. 1) Differential equations with initial and boundary value problem by Dennis G Zill 2) Analytical Solution of PDEs by Sankara Rao 3) Elementary applications of differential equations by Richard Habarmas
3. ### C++ programming. i urgently need help in this.plz help me!

Write a C++ program that uses the following function that computes xn.

11. ### Identitiy help urgently needed

Hi , I am having problems proving the identity tan^2x-sin^2x=tan^2xsin^2x Heres what I have done so far [tex] sin^2x - sin^2x(cos^2x) cos^2x
12. ### Urgently need help with chemestry!

Through special sources, I learned that for my practical test tomorrow, my chemical is Br I2 F (which i need to build using VESPR theory). Its hard enough trying to get the lewis diagram (i don't know what is central atom since they're all atoms with 7 valence electrons, how many bonds I have to...
13. ### Need Help Urgently...

Q1 - Evaluate the iterated integral by converting to polar coordinates ∫0 to 2 ∫-Sqrt 4-x^2 to Sqrt 4-x^2 e^(-x^2-y^2) dy dx The region of integration is bounded by -Sqrt 4-x^2 ≤ y ≤ Sqrt 4-x^2 and 0 ≤ x ≤ 2 Q2 - Evaluate the triple integral ∫∫R∫ OR ∫∫∫R f(x,y,z)dV With f(x,y,z)=Sqrt y...
14. ### This one problem...(Help needed urgently!!)

You travel from San Diego to San Francisco. There are 3 ways to Los Angeles, 2 ways to Beverly Hills from Los Angeles and 4 ways to San Fransisco from Los Angeles. How many different ways you may travel from San Diego to San Francisco?
15. ### need a starting point urgently.

A manufacturer is to design and make plastic drinking cups in the form of an open cylinder and decides that the maximum capacity of the cups must be 400cm^3. clearly the manufacturer wishes to keep costs to a minimum. what dimensions for the cylinder would you suggest? any help would be...
16. ### i need to answer a question related to trigonometry urgently

i have to evaluate without using a calculator cos 165 can someone help me out
17. ### Limits? Maybe. Need help urgently.

I've been working on this problem for a while and it's got me stumped. http://img59.imageshack.us/img59/1536/calc1ho7.png I thought I was doing it right, until in the third column I got Undefined for where x = 2 and f(x) = 4. I don't need the entire column filled it, just a couple values...
18. ### Help urgently!

I have no clue how to work out the revenue for my assignment? please help. "a surfboard company produces a particluar style of thongs. the fixed cost to set up production is $1500 and the cost to produce each pair of thongs is$2.50" a) write an expression for the revenue (R dollars) earned...
19. ### complex number and trigo Urgently

given that z =cosθ +jsinθ ((z²-1)/(z²+1))=jtanθ Can someone prove it to mi pls. THX