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3 years ago

Which expression replaces the box to form an equation ? please help ASAP!:)

Mathematics

1 answer:

STatiana [176]3 years ago

6 0

Form a what?

30/2 + 2(7) = 3(10)/2 + 2(7) = 3(10/2) + 2(7)

Answer: First choice

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If f(x)=ln(sin(2x)), f''(π/4) is equal to

Licemer1 [7]

Use the chain rule to compute the second derivative:

$f(x)=\ln(\sin(2x))$

The first derivative is

$f'(x)=(\ln(\sin(2x)))'=\dfrac{(\sin(2x))'}{\sin(2x)}=\dfrac{\cos(2x)(2x)'}{\sin(2x)}=\dfrac{2\cos(2x)}{\sin(2x)}$

$f'(x)=2\cot(2x)$

Then the second derivative is

$f''(x)=(2\cot(2x))'=-2\csc^2(2x)(2x)'$

$f''(x)=-4\csc^2(2x)$

Then plug in π/4 for <em>x</em> :

$f''\left(\dfrac\pi4\right)=-4\csc^2\left(\dfrac{2\pi}4\right)=-4$

4 0

3 years ago

True or False?

Daniel [21]

Answer:

True

Step-by-step explanation:

7 0

3 years ago

If you are driving on the freeway at 55 mph and you travel for 5 hours, how far will you have gone?

alina1380 [7]

275 because 55 times 5 equals 275 ! Hope this helps

8 0

3 years ago

Read 2 more answers

The frequency with which a cricket chirps varies directly with the temperature. If the cricket chirps 100 times per minute in 80

Karo-lina-s [1.5K]

The answer is: D) 115

The explanation is shown below:

1. You have that the frequency with which a cricket chirps varies directly with the temperature, which you can express it as following:

$y=kx$

Where $y$ is the frequency with which a cricket chirps, $x$ is the temperature and $k$ is the constant of proportionality.

2. If the cricket chirps 100 times per minute in 80° weather, you can calculate $k$ as below:

$k=\frac{100}{80}=1.25$

3. Therefore, the frequency in 92° weather is:

$y=1.25x\\y=(1.25)(92)\\y=115$

3 0

3 years ago

There are 3 boys for every 2 girls in a dance competition. Does it make sense for there to be a total of 9 people in the competi

rjkz [21]

Answer:

Yes

Step-by-step explanation:

3:2 = 5 people

3:1 = 4 people

5+4=9 people

6 0

3 years ago

Read 2 more answers