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3 years ago

Robin can clean 72 rooms in 666 days.

Mathematics

2 answers:

Leokris [45]3 years ago

7 0

Answer:

108 rooms

Step-by-step explanation:

Robin can clean 72 rooms in 666 days

means in 666 days rooms that can be clean is 72 rooms

in 1 days rooms that can be clean is 72/666 rooms

in 999 days rooms can be clean is 999\times 72\div 666

after solving we get 108 answer

kati45 [8]3 years ago

7 0

Answer:

108 rooms love

Step-by-step explanation:

btw its depree

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Read 2 more answers

The rate of change of revenue (in dollars per calculator) from the sale of x calculators is R′(x)=(x+1)ln(x+1)R ′ (x)=(x+1)ln(x+

jekas [21]

Answer:

Total revenue = $\frac{169}{2}\ln(13)-\frac{169}{4}$ dollars

Step-by-step explanation:

$R'(x)=(x+1)\ln(x+1)$

Integrate with respect to $x$ .

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$dx=du$

So,

$R(x)=$ ∫ $u\ln(u)\,du$

Use integration by parts: ∫f g dx = f∫ g dx-∫(∫g dx)f' dx

Therefore,

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Put $u=x+1$

$R(x)= \frac{(x+1)^2}{2}\ln(x+1)-\frac{(x+1)^2}{4}$

To find total revenue from the sale of the first 12 calculators, put $x=12$

$R(x)= \frac{(12+1)^2}{2}\ln(12+1)-\frac{(12+1)^2}{4}\\\\= \frac{(13)^2}{2}\ln(13)-\frac{(13)^2}{4}\\\\=\frac{169}{2}\ln(13)-\frac{169}{4}$

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3 years ago

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3 years ago

In the first year of a 10,000 investment the interest rate was 6%. All earned interest remained invested for the second year, an

Aleks04 [339]

Answer:

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Step-by-step explanation:

First year:

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Second Year:

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Total Return:

Final Balance - Initial balance

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