...trigonometric identity, so you were probably expected to know it. sin(pi -

**x**) = sin(pi)*cos(**x**) - cos(pi)*sin(**x**) sin(pi -**x**) = 0*cos(**x**) - (-1)*sin(**x**) sin(pi -**x**...2 Answers · Science & Mathematics · 20/10/2011

2) (5-4

**x**)/7 = (3-11x)/12= 60 - 48x = 21 - 77x 29x = - 39**x**= -39/295 Answers · Science & Mathematics · 30/03/2009

c) is easy; they're just asking for C(0). To do the rest, set C' = 0. Since C'' is uniformly = 10 (Helloooo! Upward-facing parabola!), that critical point will indeed be a minimum. C and C' at the...

1 Answers · Science & Mathematics · 20/05/2008

Olimpiada's speed— x : 1/2( x + x - 6) = 6 2x - 6 = 12 2x = 18 x = 9 John 's speed: = 9 - 6 = 3 Answer: Olimpiada's speed, 9 mph; John 's speed, 3 mph

1 Answers · Science & Mathematics · 04/01/2010

...end of a 6 mile track.

**John Doe**, an average walker, is on the other...39;s average speed exceeds**John**'s by 6 mph, find the speed of both...wildebeast speed L = lion speed**x**= time Lx = .02 * W...1 Answers · Science & Mathematics · 29/06/2012

to check youmcan just take the speed times the time and see if it is the correct distance 9 * 1/2 + 3 * 1/2 = 6 so it checks

1 Answers · Science & Mathematics · 24/10/2012

... 70 with a spread (standard deviation) of 5 points. Now, if student

**John Doe**scores 65 percent, what is his Z score or relative ...1 Answers · Science & Mathematics · 18/11/2013

...7 hours (12/7) 1/3 + 1/4 = 1/

**x**4/12 + 3/12 = 1/**x**7/12 = 1/**x x**= 12/7 7) ANSWER: 2 1/4 hours (9/4) If**John**can type 2/3 of a manuscript in 12 hours, then he takes 18 ...7 Answers · Science & Mathematics · 29/05/2009

Speed of canoe (

**x**), speed of current (y), time canoeing from passing the log and back to the... and 2nd equations: y(t + 1) = 2 y = 2/(t + 1) - (**x**- y) + t(**x**+ y) = 2 -**x**+ y + tx + ty = 2 y + ty =**x**+ 2 - tx y(1 + t) = (**x**+ 2 - tx) y = (**x**...1 Answers · Science & Mathematics · 22/10/2009

Terry paid for 70% of the original ticket price. So: x * .70 = £22.75 x = £22.75 / .70 = £32.50

7 Answers · Science & Mathematics · 09/10/2008