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Alex777 [14]
3 years ago
6

A sporting goods store is offering a 10% discount on in-line skates that normally cost $110.99. How much will the in-line skates

cost with the discount, not including tax?
Mathematics
1 answer:
IgorLugansk [536]3 years ago
5 0

Answer:

$90.90

Step-by-step explanation:

The item normally costs $110.99. If the sporting goods store is offering a 10% discount, it means that the price including the discount will be:

$110.99 x 0.90 = $99.891.

the in-line skates cost with the discount $99.89, not including taxes.

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Answer:

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Step-by-step explanation:

We know that everything is changing with respect to the time, "r" is changing with respect to the time, and also "p" just "v" will not change with the time according to the information given, so we can find the implicit derivative with respect to the time, and since

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The implicit derivative with respect to the time would be

\frac{dn}{dt}  = \frac{\pi}{8} ( \frac{r^4}{v} \frac{dp}{dt}  + \frac{4pr^3}{v}\frac{dr}{dt} )

If we multiply everything by    dt   we get  

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Remember that  the error is given by   \frac{dn}{n}   therefore doing some algebra we get that

\frac{dn}{n}  =    4 \frac{dr}{r}  +  \frac{dp}{p}

Since,    r = 0.006   ,   dr = 0.00025 ,  p = 4*105   ,   dp = 2000  we get that

\frac{dn}{n} = 0.1714

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Step-by-step explanation:

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