Assume x and y are functions of t. Evaluate dy/dt with 4xy-5x+6y^3=-126, with dx/dt=-18, and x=6,y=-2...

Assume x and y are functions of t. Evaluate dy/dt with 4xy-5x+6y^3=-126, with dx/dt=-18, and x=6,y=-2
A retail store estimates that weekly sales and weekly advertising costs x are related by s=50,000-30,000e^-0.0004x. The current weekly advertising costs are $2,500, and these costs are increasing at a rate of $400 per week. Find the current rate of change of sales per week.
Use implicit differentiation to find y’ for the equation below and then evaluate y’ at the indicated point, (-4,4). y^2+5y+9x=0
Find the indicated derivative and simplify. Y’ for y=3x-8/x^2+6x
Use implicit differentiation to find y’ and evaluate y’ at (-2,-3). 3xy+y-15=0
f(x)=8√ 2x^2+3
The demand x is the number of items that can be sold at a price of $p. For x=p^4-6p+1000, find the rate of change of p with respect to x by differentiating implicitly. The rate of change of the price p with respect to the demand x is?
Suppose that for a company manufacturing calculators, the cost, revenue, and profit equations are given by C=80,000+30x, R=200x-x^2/20, where the production output in 1 week is x calculators. If production is increasing at a rate of 600 calculators per week when production output is 4,000 calculators. Find the rate of increase in cost, revenue, profit.

Expert Solution

milcah answered 2 years ago

dx/dt = -5x + y , dy/dt = 4x - 2y

dx dt =ax+by dy dt =−x − y, 2. As the values of a and b...

dx dt =ax+by dy dt =−x − y, 2. As the values of a and b are changed so that the point (a,b) moves from one region to another, the type of the linear system changes, that is, a bifurcation occurs. Which of these bifurcations is important for the long-term behavior of solutions? Which of these bifurcations corresponds to a dramatic change in the phase plane or the x(t)and y(t)-graphs?

Find the general solution of the given system. dx/dt=6x-y dy/dt=5x+4y

dy/dx+(y/2x)=(x/(y^3))

1). Find the dervatives dy/dx and d^2/dx^2 , and evaluate them at t = 2. x...

1). Find the dervatives dy/dx and d^2/dx^2 , and evaluate them at t = 2. x = t^2 , y= t ln t 2) Find the arc length of the curve on the given interval. x = ln t , y = t + 1 , 1 < or equal to t < or equal to 2 3) Find the area of region bounded by the polar curve on the given interval. r = tan theta , pi/6 < or...

Initial value problem : Differential equations: dx/dt = x + 2y dy/dt = 2x + y...

Initial value problem : Differential equations: dx/dt = x + 2y dy/dt = 2x + y Initial conditions: x(0) = 0 y(0) = 2 a) Find the solution to this initial value problem (yes, I know, the text says that the solutions are x(t)= e^3t - e^-t and y(x) = e^3t + e^-t and but I want you to derive these solutions yourself using one of the methods we studied in chapter 4) Work this part out on paper to...

2) Solve the system of equations below dx/dt – 3x – 6y = t^2 ...

2) Solve the system of equations below dx/dt – 3x – 6y = t^2 dx/dt + dy/dt – 3y = e^t

Use a LaPlace transform to solve d^2x/dt^2+dx/dt+dy/dt=0 d^2y/dt^2+dy/dt-4dy/dt=0 x(0)=1,x'(0)=0 y(0)=-1,y'(0)=5

Solve (1+e^x)dy/dx+(e^x)y=3x^2+1 Solve (x^3+y^3)dx+3xy^2 dy = 0 Solve (y-cos y)dx + (xsiny+x)dy = 0 Solve (1+ln...

Solve (1+e^x)dy/dx+(e^x)y=3x^2+1 Solve (x^3+y^3)dx+3xy^2 dy = 0 Solve (y-cos y)dx + (xsiny+x)dy = 0 Solve (1+ln x +y/x)dx = (1-lnx)dy Solve (y^2+yx)dx - x^2dy =0 Solve (x^2+2y^2)dx = xydy Solve Bernoulli's Equation x dy/dx + 2y = (x^4)(e^x)(y^2) Solve Bernoulli's Equation (1+x^2) dy/dx = 2xy +(e^x)(y^2) Solve IVP (3e^(x^2))dy + (xy^2)dx=0 ; y(1) = 2 Solve IVP dy/dx -2xy = e^(x^2) ; y(0)=0 Solve IVP (x^2+y^2)dx+(2xy)dy=0; y(1)=1 6. Mixture Problem Initially 40 lb of salt is dissolved in a large...

Solve the following DEs 1.) dy/dx + y =e^3x 2.) x^2y' +xy = 1 3,) x(dy/dx)-y...

Solve the following DEs 1.) dy/dx + y =e^3x 2.) x^2y' +xy = 1 3,) x(dy/dx)-y = x^2 sin(x) 4.) y' - 2y = e^2x, y(0) = 2 5.) cos(x)(dy/dx) + ysin(x) = 1, y(pi/4) = 0

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