# Recent content by discy

1. ### Big O analysis

Homework Statement 4. Give a c > 0 and an integer n0 ≥ 1 such that, for all n ≥ n0. b. 16n log (n²) ≤ cn² The answer (from the sheet) is c = 32 Homework Equations .. The Attempt at a Solution When I attempt to solve such an equation I start at n=1, then go to n=2. but that way I get the...
2. ### Probability Question

is my question not clear enough?:( The exam is tomorrow (tuesday).
3. ### Probability Question

Homework Statement In a population of children 60% are vaccinated against the 'waterpokken'. The probablilities of contracting 'waterpokking' are 1/1000 if the child is vaccinated and 1/100 if not. a: Find the probability that a child selected at random will contract 'waterpokken'. Homework...
4. ### Linear Algebra Question

Would you also like to give an answer to my last question? 3. How can you be sure that the points you choose won't result in vectors that are linearly dependent? Attempt: Because a plane is non-collinear; if the points on the plane aren't on the same line, the vectors formed by those points are...
5. ### Linear Algebra Question

Thanks so much!! For the record: I made some miscalculations. I've fixed them in my first post :).
6. ### Linear Algebra Question

Hi, thanks very much! It's much more clear now! Three more questions and my attempt: 1. What is the key to create three points on different lines? Attempt: I suppose make sure that the combination should not be a scalar multiply of the other points?. So point R could be (3, 6, 5\frac{2}{3})...
7. ### Linear Algebra Question

Homework Statement How to convert an implicit representation to a parametric Homework Equations Implicit: ax + by + cz = d. Parametric: (x,y,z) = (xp, yp, zp) + s(xv,yv,zv,) + t(xw,yw,wz) The Attempt at a Solution For parametric to implicit it would look like this: (x,y,z) = (0, 7, 6)T +...
8. ### Find the linear transformation matrix

Homework Statement Suppose that a linear transformation maps a point (2,3) to (0,1) and maps a point (9,7) to (1,0). Find the matrix for this linear transformation. 2. Solution (answersheet) Observe that the two point that are the result of the mapping are the two base vectors. If our...
9. ### Find k if (4,1,k) & (5,1,-3) are perpendicular?

Ow yeah. I'm being stupid. And if two vectors are parallel? then the angle is, I suppose 180 degrees? What equation would I need to solve in that case? (i'm sorry, my teacher is very unclear about these things, he puts questions on his sheets but doesn't always give the answers during class)...
10. ### Find k if (4,1,k) & (5,1,-3) are perpendicular?

ok. so let me reform: (21-3k) / √(17+k²) * √35 = 0 \frac{21-3k}{\sqrt{17+k²} * \sqrt{35}} = 0 what would be the easiest way to get to k = 7? (when I put 7 as k I get zero, so the equation is correct)
11. ### Find k if (4,1,k) & (5,1,-3) are perpendicular?

Homework Statement Vectors find k if (4,1,k)τ & (5,1,-3)τ are perpendicular? From the answer sheet I know the answer is k = 7 Homework Equations I believe I need these two but I'm not certain: Dot-product: v*w = v1w1 + v2w2 + ... vdwd cos θ = v*w / ||v|| * ||w|| The Attempt at...

/close
13. ### Derivative 1/x³

hm okay. like x^-3. got it. I guess I should learn this formula, not only because it's a "familiar" one for you guys. But also because for some reason it's not on my formula sheet. :) tnx for your help.
14. ### Derivative 1/x³

thanks for your answer. now how would I put 1/x³ into that formula to get -0.5 * x^-2 ?
15. ### Derivative 1/x³

how to compute the ANTI derivative of 1 / x^3 I think I need the formula: f(x) = 1/x^n than f'(x) = -n/x^n+1 but I'm not sure and don't know how to use it. I know the answer is: -0.5 * x^-2 but have no idea why. could someone explain this to me please?