PLZ HELP i will give my last 10 points

Anna baked 3 batches of cookies with c cc cookies in each batch. She then ate 8 cookies!

Stels [109]

Answer:

there is no correct answer

Step-by-step explanation:

not enough information.

4 0

3 years ago

Dmitry runs 3.1 miles on saturday,shows by the model. he runs 2.45 miles on sunday. how much farther does he run on saturday

Alborosie

Answer: 0.65

Step-by-step explanation: Because when you look at the numbers you can see how to goes down more so when you subtract 2.45 from 3.1 you get 0.65

Hope this helps :)

8 0

3 years ago

I can't seem to figure this one out. Could someone show how to do it and the answer? Thanks in advance!

vagabundo [1.1K]

Answer:

$\displaystyle (-\infty, -\frac{1}{6})$

Step-by-Step explanation:

We have the function:

$\displaystyle y=\int_{1}^{x}\frac{1}{3+t+3t^2}\, dt$

And we want to find the interval for which y is concave upwards.

Therefore, we will need to find the second derivative of y, find its inflection points (where y''=0), and test for values.

So, let's take the derivative of both sides with respect to x. So:

$\displaystyle y^\prime=\frac{d}{dx}\Bigg[\int_{1}^{x}\frac{1}{3+t+3t^2}\, dt\Bigg]$

By the Fundamental Theorem of Calculus:

$\displaystyle y^\prime=\frac{1}{3+x+3x^2}$

So, we will take the derivative again. Hence:

$\displaystyle y^\prime^\prime=\frac{d}{dx}\Big[\frac{1}{3+x+3x^2}\Big]=\frac{d}{dx}\Big[(3+x+3x^2)^{-1}\Big]$

We will use the chain rule. Let:

$\displaystyle u=x^{-1}\text{ and } v=3+x+3x^2$

Differentiate:

$\displaystyle y^\prime^\prime=-(3+x+3x^2)^{-2}(1+6x)$

Rewrite:

$\displaystyle y^\prime^\prime=-\frac{6x+1}{(3+x+3x^2)^2}$

So, points of inflection, where the concavity changes, is whenever the second derivative is 0 or undefined.

We can see that the second derivative will never be undefined since the denominator can never equal 0.

So, our only possible inflection points are when it's equal to 0. Hence:

$\displaystyle 0=-\frac{6x+1}{(3+x+3x^2)^2}$

Multiplying both sides by the denominator gives:

$0=-(6x+1)$

Then it follows that:

$\displaystyle x=-\frac{1}{6}$

So, our only possible point of inflection is at x=-1/6.

We will test for values less than and greater than this inflection point.

Testing for x=-1, we see that:

$\displaystyle y^\prime^\prime=-\frac{6(-1)+1}{3+(-1)+3(-1)^2}=1>0$

Since the result is positive, y is concave up for all values less than -1/6.

And testing for x=0, we see that:

$\displaystyle y^\prime^\prime=-\frac{6(0)+1}{3+(0)+3(0)^2}=-\frac{1}{3}$

Since the result is negative, y is concave down for all values greater than -1/6.

Therefore, the interval for which y is concave up is:

$\displaystyle (-\infty, -\frac{1}{6})$

Note that we use parentheses instead of brackets since at exactly x=-1/6, our graph is neither concave up nor concave down.

5 0

3 years ago

Murphy family has 4 members and they went to 7 games. Chen family has 5 members and they went to 4 games. In total, the two fami

ki77a [65]

Answer:

700$

Step-by-step explanation:

If all the seats cost tge same and each member takes a seat each game so we can say:

7×4=28

5×4=20

28x+20x=1200

48x=1200

x=25(seat price)

28×25=700

20×25=500

5 0

3 years ago

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My question is: 40 people voted for ""other"". what’s the estimate of total voters from part (b) accurate?

kirill [66]

Answer:

No

Step-by-step explanation:

From part (b)

If number who voted = 280

Number of voters who would have voted Geron:

35% * 280

0. 35 * 280 = 98 voters

40 people voted for others:

To check if estimate from. Part b is accurate :

10% voted for others

10% of estimated voters = 40

Let, number of estimated voters = x

0.1 * x = 40

0.1x = 40

x = 40/0.1

x = 400

If 40 people Voted others, the the number of voters should be 400 and not 280

6 0

3 years ago

Read 2 more answers