Mathematics, 24.12.2020 17:40 robertjoy19

I guess I'm lacking in differential equations. I couldn't solve this question. Can you help me?

Answers: 2

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Answers

Answer from: kookycookiefanx

See Explanation.

General Formulas and Concepts:

Pre-Algebra

Equality PropertiesReciprocals

Algebra II

Log/Ln Property: $ln(\frac{a}{b} ) = ln(a) - ln(b)$

Calculus

Derivatives

Basic Power Rule:

f(x) = cxⁿf’(x) = c·nxⁿ⁻¹

Chain Rule: $\frac{d}{dx}[f(g(x))] =f'(g(x)) \cdot g'(x)$

Derivative of Ln: $\frac{d}{dx} [ln(u)] = \frac{u'}{u}$

Step-by-step explanation:

Step 1: Define

$ln(\frac{2x-1}{x-1} )=t$

Step 2: Differentiate

Rewrite: $t = ln(\frac{2x-1}{x-1})$ Rewrite [Ln Properties]: t = ln(2x-1) - ln(x - 1)

Differentiate [Ln/Chain Rule/Basic Power Rule]: $\frac{dt}{dx} = \frac{1}{2x-1} \cdot 2 - \frac{1}{x-1} \cdot 1$ Simplify: $\frac{dt}{dx} = \frac{2}{2x-1} - \frac{1}{x-1}$ Rewrite: $\frac{dt}{dx} = \frac{2(x-1)}{(2x-1)(x-1)} - \frac{2x-1}{(2x-1)(x-1)}$ Combine: $\frac{dt}{dx} = \frac{-1}{(2x-1)(x-1)}$ Reciprocate: $\frac{dx}{dt} = -(2x-1)(x-1)$ Distribute: $\frac{dx}{dt} = (1-2x)(x-1)$

Answer from: curlyloo01

See below.

Step-by-step explanation:

We are given $\displaystyle ln \Big ( \frac{2x-1}{x-1} \Big ) = t$ and we want to find the first derivative of this function.

We can use the derivative of any function inside a natural log, denoted by $\displaystyle \frac{d}{dx} \text{ln} \ u = \frac{\frac{d}{dx} u}{u}$ , where u represents any function.

Let's take the derivative of the whole function with respect to x. This will look like:

$\displaystyle \frac{d}{dx} \displaystyle \Big [ ln \Big ( \frac{2x-1}{x-1} \Big ) = t \Big ] = \frac{\frac{d}{dx} (\frac{2x-1}{x-1}) }{\frac{2x-1}{x-1} } = \frac{dt}{dx}$

Let's take the derivative of the inside function, $\displaystyle \frac{2x-1}{x-1}$ , first. We will need the quotient rule, which is:

$\displaystyle \frac{d}{dx} \Big [ \frac{f(x)}{g(x)} \Big] = \frac{g(x) \cdot \frac{d}{dx}f(x)-f(x)\cdot \frac{d}{dx}g(x) }{[g(x)]^2}$

Here we have f(x) = 2x - 1 and g(x) = x - 1. Let's plug these values into the formula above:

$\displaystyle \frac{d}{dx} \Big [ \frac{2x-1}{x-1} \Big ] = \frac{[(x-1)\cdot 2 ] - [(2x-1) \cdot 1]}{(x-1)^2}$ $\displaystyle \frac{d}{dx} \Big [ \frac{2x-1}{x-1} \Big ] = \frac{2x-2-2x+1}{(x-1)^2}$ $\displaystyle \frac{d}{dx} \Big [ \frac{2x-1}{x-1} \Big ] = \frac{-1}{(x-1)^2}$

Now, we can substitute this back into the original equation for the derivative of the entire function.

$\displaystyle \frac{dt}{dx} = \frac{\frac{-1}{(x-1)^2} }{\frac{2x-1}{x-1} }$

Multiply the numerator by the reciprocal of the denominator.

$\displaystyle \frac{dt}{dx} = \frac{-1}{(x-1)^2} \cdot \frac{x-1}{2x-1}$

The (x - 1)'s cancel out and we are left with:

$\displaystyle \frac{dt}{dx} = \frac{-1}{(x-1)} \cdot \frac{1}{2x-1}$

This can be further simplified to a single fraction:

$\displaystyle \frac{dt}{dx} =\frac{-1}{(x-1)(2x-1)}$

Now we have dt/dx, but we want to find dx/dt. Therefore, we can flip the equation and have it in terms of dx/dt:

$\displaystyle \frac{dx}{dt} =\frac{(x-1)(2x-1)}{-1}$ $\displaystyle \frac{dx}{dt} =-(x-1)(2x-1)$

This can be further simplified to fit the expression the problem gives for dx/dt:

$\displaystyle \frac{dx}{dt} =(x-1)(1-2x)$

This is equivalent to the equation in the problem; therefore, the verification is complete.

Answer from: Quest

step-by-step explanation:

well if you round, things become much more simple. round 5.95 to 6, 4.25 to 4, and 1.05 to 1. now, add 6+4+1 and that would equal 11. so the items together would equal to about $11.

Answer from: Quest

110698.56 square miles

step-by-step explanation:

multiply 3.8 by 102

387.6

multiply 2.8 by 102

285.6

multiply those two to get

110698.56 square miles

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