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80=2x^2+3x 2x^2+3x-80=0 solve for x x=-3+sqrt(3^2-4(2)(-80)/2(2) x=5.61 ft w=2x+3 w=14.24ft

3 Answers · Science & Mathematics · 04/03/2008

In order to know whether the two lines are in perpendicular, you need to focus on their gradient. Let m1 be the gradient of linear equation 1, y=(m1)x+c and m2 be the gradient of liners equation 2, y=(m2)x+c then if m1 times m2 equal to -1, then the two lines are...

4 Answers · Science & Mathematics · 04/05/2012

No, 2/5 is not a solution of 5m + 1 = 10m - 2 5m = 3 m = 3/5

6 Answers · Science & Mathematics · 17/03/2012

R(p) is the product of two functions, f(p) and g(p) =p. Product rule.

1 Answers · Science & Mathematics · 20/02/2011

L(x) = f(a) + f'(a)(x - a) f(x) = (x + 1)/x f(a) = f(1) = 2 f'(x) = [x - (x + 1)]/x² = -1/x² f'(a) = f'(1) = -1 L(x) = 2 - (x - 1) = 2 - x + 1 L(x) = 3 - x

1 Answers · Science & Mathematics · 04/11/2009

1. did you mean : y=7-x^2+4x^3 then dy/dx=-2x+12x^2 x=2 --> dy/dx=2x+12x^2 = 2*2+12*2^2 = 52 x=1 --> dy/dx=2x+12x^2 = 2*1+12*1^2 = 14 2. y^2=1+x^2 -->y=±√(1+x^2) dy/dx=±x/√(1+x^2) x=3 --> dy/dx=±x/√(1+x^2) = ±3/√(10) x=2 --> dy/dx=±x/√(1+x^2) = ±2/√(5)

2 Answers · Science & Mathematics · 29/02/2012

Hi, Recall that the x-intercept occurs when 'y' equals zero to get: 2x - 0 = 2 2x = 2 x = 1 or (1,0) Also, the y-intercept occurs when 'x' equals zero and therefore we get: 2(0) - y = 2 -y = 2 y = -2 or (0,-2) I hope that...

3 Answers · Science & Mathematics · 16/09/2009

392. you add up all the multiples, then divide by the number of multiples.

3 Answers · Science & Mathematics · 02/06/2010

6x+5+7x+3=12x+4 Take all values containing x in one side and all the others in the other side: 6x+7x-12x = 4-5-3 (when moving a number from one side to another, we reverse the sign) 6x+7x-12x = 13x-12x= 1x (or x) 4-5-3 = -1-3=-4 therefore x=-4 (:

11 Answers · Science & Mathematics · 05/07/2009