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1. ### College Algebra - Finding the Coefficient?

(x + y)^n: Coefficient of term x^(n-k) y^k = C(n, k) x^97: Coefficient of x^(100-3) (-1)^3 is C(100...

3 Answers · Science & Mathematics · 12/01/2018

... AB = BA, then (A + B)^k = Σ(j = 0 to k) C(k, j) A^j B^(k-j). For instance, look at the case when k = 2...

1 Answers · Science & Mathematics · 21/12/2017

3. ### Plasma angular frequency question?

frequency for k->0 wave: wp. This is the lowest frequency. v_phase = w/k = c sqrt( 1 + wp^2/(ck)^2 ) v_group = dw/dk = c / sqrt( 1 + wp^2 / (c^2 k^2))

1 Answers · Science & Mathematics · 18/12/2017

4. ### How do I solve the differential equation?

y' + x*y = 130x This is linear differential equation therefore the answer is y = y_h + y_p; solve first for y_h y' + x*y = 0 -> y' = -x*y -> y'/y = -x -> ln(y) = C - ((x^2)/2) -> y = e^[C - ((x^2)/2)] -> y = C*exp(-(x^2)/2); Now solve for y_h by...

2 Answers · Science & Mathematics · 14/12/2017

5. ### How do you find the equilibrium constant for the chemical equation?

Δn for this reaction is 2-4 = -2 (moles of gaseous products minus moles of gaseous reactants) Kp = Kc (RT)^Δn 0.621 = Kc (0.08206 X484K) ^-2 Kc = 0.0985 R is used with pressure in...

1 Answers · Science & Mathematics · 04/12/2017

.../r^2 0.5mv^2 = -C/r + K v = 0 at r = 1.2 x 10^11 K = C/1.2 x 10^11 at r= infinity v = 3 x 10^7 0.5(4.5 x 10^4)(3 x10^7)^2 = C...

2 Answers · Science & Mathematics · 03/12/2017

7. ### What this sentences mean?

Our victims won't be talking; and we,too, keep it entirely to ourselves. We don't repeat what we say to ourselves to anybody else.

1 Answers · Entertainment & Music · 26/11/2017

8. ### Let a and b be two integers...?

If a = nc + k and b=nd + k (where k, c, and d are integers), then a - b = (nc + k) - (nd + k) = n(c - d), which...

1 Answers · Science & Mathematics · 26/11/2017

9. ### Calorimeter/chemistry help?

Heat gained or lost = specific heat x mass of sample x temperature change. A change of 1 oC equals of change of 1oK Heat gained by water: 4.18 Joules/gK x 75.0 g x (28.3-24.9 C) = 1066 Joules Heat lost by...

1 Answers · Science & Mathematics · 02/11/2017

10. ### A fair coin is tossed 15 times. What is the probability that exactly 3 heads occur?

Binomial probability formula: P(X=k) = C(n,k) * p^k * q^(n-k) n : number of trials (15) k : number...

2 Answers · Science & Mathematics · 01/11/2017