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White raven [17]
3 years ago
8

What function do you know from calculus is such that its first derivative is a constant multiple k of itself

Mathematics
1 answer:
deff fn [24]3 years ago
5 0

Answer:

Exponential function if the form e^{Kx} is the constant multiple K of itself if.

y'=\frac{dy}{dx}=cKe^{Kx} \\y'=Ky

Step-by-step explanation:

The exponential function of the form e^x is the function which is the derivative of itself.

Where:

x is independent variable

Now if we talk about constant then again exponential function if the form e^{Kx} is the constant multiple K of itself if we take the dervative.

Mathmatical Prove:

Consider the general equation

let y=ce^{Kx}

Where:

K is a constant

c is the cofficient(could be any number)

Now:

Taking derivative of above equation w.r.t x:

y'=\frac{dy}{dx}=cKe^{Kx} \\y'=Ky

Hence proved exponential function is a constant multiple K of it self.

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Una parte de 25 000 dólares se invierte al 10% de interés, otra parte al 12 % y el resto al 16%. El ingreso anual total de las t
Drupady [299]

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  • $5000 at 10%, $10000 at 12% and 10000 at 16%

Step-by-step explanation:

  • <em>One part of $ 25,000 is invested at 10% interest, another part at 12%, and the rest at 16%. The total annual income from the three investments is $ 3,200. Also, the income from the investment at 16% is equal to the income from the other two investments combined. How much was invested at each interest rate?</em>

==================

Let the parts be x, y and z

<u>As per given we get below system of equations:</u>

  • x + y + z = 25000
  • 0.1x + 0.12y + 0.16z = 3200
  • 0.1x + 0.2y = 0.16z

<u>Substitute 0.1x + 0.2y in the second equation:</u>

  • 0.16z + 0.16z = 3200
  • 0.32z = 3200
  • z = 3200/0.32
  • z = 10000

<u>Now we have:</u>

  • x + y + 10000 = 25000 ⇒ x + y = 15000

and

  • 0.1x + 0.12y + 0.16*10000 = 3200 ⇒ 0.1x + 0.12y = 1600

<u>Multiply the second equation and then subtract the first one:</u>

  • 10(0.1x + 0.12y) = 10(1600) ⇒ x + 1.2y = 16000
  • x + 1.2y - (x + y) = 16000 - 15000
  • 0.2y = 1000
  • y = 10000

Then

  • x = 15000 - 10000 = 5000

<u>So the parts are:</u>

  • $5000 at 10%, $10000 at 12% and 10000 at 16%
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