# Yahoo Web Search

1. ### Prove (n, k) = (n, n - k)?

... SOLUTION: I like to use this notation: C(n, k) = n! / [(n - k)! k!] That would mean: C(n, n - k) = n! / [(n...;--> {A, B, C} So C(n,k) = C(n, n-k)

6 Answers · Science & Mathematics · 12/09/2019

2. ### what must be the value of k?

y = 4x - 8 The inverse is: x = 4y - 8 x + 8 = 4y y = (x + 8) / 4 y = (1/4)x + 2 So k = 2

3 Answers · Science & Mathematics · 28/08/2019

3. ### What value can k not have if the system needs to be consistent?

1 Answers · Science & Mathematics · 17/09/2019

4. ### Find the equation of the circle that passes through the points A(6,5), B(-3,2) and C(-2,1)?

(x - h)^2 + (y - k)^2 = r^2 (6 - h)^2 + (5 - k)^2 = r^2 (-3 - h)^2 + (2 - k)^2 = r^2 (-2 - h)^2 + (1 - k)^2 = r^2 (6 - h)^2 + (5 - k)^2 = (-3 - h...6k = 0 48 - 18 - 6k = 0 30 - 6k = 0 6k = 30 k = 30/6 k = 5 (6 - 1)^2 + (5 - 5)^2 = r^2...

2 Answers · Science & Mathematics · 09/09/2019

5. ### How to solve Newton s Law of Cooling when not given initial temperature?

...and 2 points. Set up a system of equations, solve for c and k, then find T(0) 415 = 75 + c * e^(-10k) 340 = c * e^(-10k) 347 = 75 + c * e^(-20k...

2 Answers · Science & Mathematics · 04/09/2019

6. ### How do I simplify a combination expression with a variable?

.... So you can reduce this to: kC3 / 10C3 kC3 = k(k-1)(k-2) / 3! 10C3 = 10*9*8 / 3! When you divide, the 3! will cancel...

2 Answers · Science & Mathematics · 01/09/2019

7. ### How can I find y2 and y4?

...guess that those deltas are difference operators, with Δy_k = y_(k+1) - y_k and Δ²y_k = Δy_(k+1) - Δy_k...

1 Answers · Science & Mathematics · 16/09/2019

8. ### Question about probabilities?

...1), ... , X(8) has just two elements (a.k.a. "states"): 1 and 2; so its transition...k)=2 and X(k+1)=2} = 4. #{k∈{1, ... , 7} : X(k)=2 and X(k+1)=1} = 1. Finally, recall that...

1 Answers · Science & Mathematics · 16/09/2019

9. ### Is there a method to work out how to express a non-unit fraction as the product of unique unit fractions?

...0 < n/d < 1 . Take a positive number k so that 1/k < n/d < 1/(k-1) . n/d - 1/k = (nk...

2 Answers · Science & Mathematics · 01/09/2019

10. ### The following exercise is based on the half-angle formulas. Use the fact that sin(π/6) = 1/2 to prove that tan(π/12) = 2 −sqrt 3.?

...sin(pi/12)^2 * cos(pi/12)^2 1/16 = (1 - cos(pi/12)^2) * cos(pi/12)^2 cos(pi/12)^2 = k (1/16) = (1 - k) * k 1 = 16 * k * (1 - k) 1 = 16k - 16k^2 16k^2 - 16k + 1 = 0 k = (16...

1 Answers · Science & Mathematics · 25/08/2019