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nikitadnepr [17]
3 years ago
15

5. A man is 6 times as old as his daughter. The man's son is 4 years older than his sister.

Mathematics
1 answer:
maxonik [38]3 years ago
6 0

Answer:

82-10=72

72:6=12 daughter`s age

12+4=16 son`s age

16+12= 28

72-28=44 man`s age

Step-by-step explanation:

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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)

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R(x)= ∫(x+1)\ln(x+1) dx

Take x+1=u

Differentiate with respect to x

dx=du

So,

R(x)= ∫u\ln(u)\,du

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R(x)=  \frac{u^2}{2}\ln(u) -  ∫\frac{u^2}{2}\frac{1}{u}\,du

=  \frac{u^2}{2}\ln(u) -  ∫\frac{u}{2}\,du

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

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

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Answer:

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Step-by-step explanation:

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but

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A

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(2.5,39)

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