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3 years ago

14

Simplificando a expressão (3x^2 + 5x - 2) + (x^2 - 2x - 1) , vamos obter :

1 answer:

Artist 52 [7]3 years ago

7 0

You have to add all the common terms together.

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Jose's Bikes rents bikes for $14 plus $3 per hour. Heather paid $38 to rent a bike. For how many hours did she rent the bike?

Nady [450]

Answer:

8 hours

Step-by-step explanation:

14 + 3x =38

-14 -14

--------------------

3x = 24

---- ----

3 3

--------------------

x = 8

4 0

2 years ago

Which graph represent me y= y=3√x-5 ( I can’t add all 4 of the graphs because it won’t let me attach 2 photos) BUT I REALLY NEED

Andrews [41]

I think this is the graph for your answer, for the next question like this, try to use "Desmos"

7 0

2 years ago

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 $x$ .

$R(x)=$ ∫ $(x+1)\ln(x+1)$ dx

Take $x+1=u$

Differentiate with respect to $x$

$dx=du$

So,

$R(x)=$ ∫ $u\ln(u)\,du$

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

Therefore,

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

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

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 $x=12$

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

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

4 0

2 years ago

Help me pleaseeeeeee

bekas [8.4K]

It’s b

it has to be 20 c long … kskdhdhiIakakkwdydyxiajajshsuuaisudj

7 0

2 years ago

What is the square root of 9

GalinKa [24]

3 is the answer. 3 X 3 = 9
I'm glad I could help

7 0

3 years ago