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1. Mathematics?

Really? With ones along the diagonal, you can just read off the solution: x1 = -5 x2 = 3 x3 = -3 x4 = 0

2 Answers · Science & Mathematics · 21/07/2019

2. Find the sum?

...sum of each row is 10 higher than the sum of the previous row (you add k on the left but and you drop k-10 on the right which is a difference of k - (k...

2 Answers · Science & Mathematics · 18/07/2019

3. n and k are natural numbers. C: combination. Can you show: 1) (2n)C(n) is even; 2) (2n)C(2k-1) is also even if 1 =< k =< n?

...(m,s−1) (2k−1)C(2n,2k−1) = (2n−2k+2)C(2n,2k−2) = 2(n−k+1)C(2n,2k−2) for n≥k≥1 (2k−1) is odd hence 2 | C(2n...

2 Answers · Science & Mathematics · 13/07/2019

4. The Value P varies directly with q^-1. If p= 1/6 when q= 5/8, what is the value of p when q=18.?

P = k/q..,.., now find k 1/6 = k/ 5/8 1/6 = 8k/5 48k= 5 k = 5/48 So equation now is P = 5/48q P= 5/ (48 x 18) P = 5/864

6 Answers · Science & Mathematics · 09/07/2019

5. Find the formula for f.?

vertex: (-4, 4) zeros are at (-8, 0), (0, 0) f(x) = a(x - h)^2 + k => (h, k) is the vertex. f(x) = a(x + 4)^2 + 4 (0, 0): f(0) = a * 4 + 4 = 0 a = -1/4 f(x) = -1/4 * (x + 4)^2 + 4 https://www.desmos.com/calculator/lycfznhxny

4 Answers · Science & Mathematics · 07/07/2019

6. Kamal is 17 years older than Gina. Gina is 3 years younger than Rachelle. If the sum of their ages is 77, how old is Gina?

Equations, that's one way. K = G + 17 G = R - 3, or R = G+3 K + G...

10 Answers · Science & Mathematics · 02/07/2019

7. Can anybody solve this math for me?

... where J and Q intersect. We have ∠10 which is where K and Q intersect. Since the line Q crosses the two ...

2 Answers · Science & Mathematics · 27/06/2019

8. What's the focus of the parabola x^2 = –4y?

y = a * (x - h)^2 + k (h , k) is the vertex (h , k + 1/(4a)) is the focus x^2 = -4y -4y = x...

3 Answers · Science & Mathematics · 27/06/2019

9. What is equivalent to 1000C512?

... 488 of them to *exclude*. In general: nCk = nC(n-k) For example, if you had 5 people and you were choosing...

2 Answers · Science & Mathematics · 24/06/2019