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iogann1982 [59]
3 years ago
10

You want to buy a CD player that costs $100. You get paid $6 per hour

Mathematics
1 answer:
photoshop1234 [79]3 years ago
6 0

Answer:

6x=100+80

6x=180

x=180÷6

x=30

so we have to work for 30 hours to can buy the CD player and still have $ 80.

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Answer:

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4 years ago
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wlad13 [49]

Answer:

\frac{dy}{dx}=\frac{x(1-2lnx)}{x^{4}}

Step-by-step explanation:

To solve the question we refresh our knowledge of the quotient rule.

For a function f(x) express as a ratio of another functions u(x) and v(x) i.e

f(x)=\frac{u(x)}{v(x)}\\, the derivative is express as

\frac{df(x)}{dx}=\frac{v(x)\frac{du(x)}{dx}-u(x)\frac{dv(x)}{dx}}{v(x)^{2} }

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we assign u(x)=lnx and v(x)=x^2

and the derivatives

\frac{du(x)}{dx}=\frac{1}{x}\\\frac{dv(x)}{dx}=2x\\.

Note the expression used in determining the derivative of the logarithm function.it was obtain from the general expression of logarithm derivative i.e y=lnx\\\frac{dy}{dx}=\frac{1}{x}

If we substitute values into the quotient expression we arrive at

\frac{dy}{dx}=\frac{(x^{2}*\frac{1}{x})-(2x*lnx)}{x^{4}}\\\frac{dy}{dx}=\frac{x-2xlnx}{x^{4}}\\\frac{dy}{dx}=\frac{x(1-2lnx)}{x^{4}}

8 0
3 years ago
What is negative 7 over 2 simplified
anyanavicka [17]
It's just like multiplying and dividing a negative, such as -1 *2=-2 and -2 / 1= -1

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answer= -3 1/2
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3 years ago
The school PTA invested 200.00 for the DJ. If they only made 125.00 on the dance, their profit would be -75.00? What does this m
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Answer:

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Step-by-step explanation:

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On a map, 2 inches represents 60 miles. What part of an inch represents 12 miles? Please show how you get you answer.
e-lub [12.9K]
C: 2/5 inches is your answer 

if 2 inches are 60 miles then 12 miles is a fifth of 2 inches.
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3 years ago
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