All Answers

Guest:
assume that x and y are both differentiable functions of t and find the required values of dy/dt and dx/dt find dy/dt when x=9 given that dx/dt=9

No one has answered this question because I don't think that there is enough information.

MelodyMar 15, 2014

+118725

bob1234567878787:
how to calculate the probability of randomly guessing the given number of correct answers on a 30 question multiple choice exam that has 4 choices

30Cn * 0.25 ⁿ * 0.75 ^30-n

where n is the number of correct guesses.

That is exactly what Rom said only he gave the explanation

MelodyMar 15, 2014

+118725

mjkirk123:
what does adjacent mean?

adjacent house blocks would share a common fence line.

adjacent sides of a quadrilateral touch each other - they share a vertice.

Adjacent angles share a common vertice and share a common ray.

MelodyMar 15, 2014

+118725

kiyya:
y=2sin(x+3pi/4)-2

140315 sine drop by 2.JPG

MelodyMar 15, 2014

+118725

kiyya:
y=2sin(x+3pi/4)-2

Hi kiyya,
No one has replied because you have not asked a question.
what do you want? do you want to graph it?

Alright, for starters it is a sine curve so the basic shape will be like this;

y=sinx.JPG

Now the phase shift is 3pi/4 so it is moved 3pi/4 to the LEFT (I think that is the right terminology)
So lets look at how that effects the graph.
140315 sine phase shift.JPG

now the amplitude is multiplied by 2 (that is the 2 in front of sin....)
140315 sine amp 2.JPG

Lastly all the points are dropped by 2 because of the -2 on the end.
The forum won't allow me to put the forth picture in so I will have to do it on a new post.

MelodyMar 15, 2014

+118725

brook93:
A game show has six doors. Behind two of the doors are cars and behind the other four are goats. Two doors are selected by the contestant. What is the probability that both of the selections are cars?

2/6 * 1/5 = 2/30 =1/15

MelodyMar 15, 2014

+6252

Clipboard02.jpg

RomMar 15, 2014

Mar 14, 2014

+130561

I meant to type....... if the sine inverse gives -30 degrees and your angle lies in the second quadrant, you must subtract 30 from 180!! I inadvertently left out the "minus" sign!! And if the sine inverse gives you 30 degrees and your angle lies in the 3rd quadrant, then you must add 30 to 180 to get the correct answer of 210.

Sorry for the confusion!!

CPhillMar 14, 2014

+130561

How do you find the exponent for this problem "e^((ln(3)*ln(2))"?

I think that there might be some confusion over this problem.

Let's look at a "log" rule:

We have
log(a*b) = log a + log b

But we DON'T have any specific "rule" for log(a) * log (b). In essence, we just "plug" ln(2)*ln(3) straight into a calculator to find the exponent!!

Note...if we had e^(lh(2) + ln(3)), this would mean the same thing as e^(ln(2))*e^(ln(3)) and THAT answer Is = "6"......This is based on the rule that e^(ln(a)) = a

I hope this helps.

CPhillMar 14, 2014

+130561

If each circle had a diameter of 10cm, then they have a radius of 5cm (half of the diameter). Then, we could find the circumference of one of the circles using C = 2*pi*r. Since each circle has the same circumference, then the total of these three things must be the wire length. I think you should be able to take it from here.

Hope this helps......

CPhillMar 14, 2014

+64

juicybebe101:
yes if u plug it into a calculator thats what you will obtain however math_lover101 is asking for the exact exponent as previously stated

Yes, but its:

e^(ln(6))
So, the only solutions are: 3^(ln(2)) AND 2^(ln(3))

Dms

DmsMar 14, 2014

+130561

If I understand the question, you have the value of the sine for some angle, but you don't know the angle. Just use the sine inverse button on your calculator ( You should be able to hit "2nd" and the "sin" button to find this. It's usually labeled as "asin" or ", "sin−1." Check your calculator manual, maybe??)

Be careful, though. The sine inverse has a range from -90 to 90 (in degrees) or from -pi/2 to pi/2 (in radians). Therefore, you need to be aware of which quadrant your angle lies. For instance, if the sine inverse gives you an angle of 30 degrees but your angle lies in the second quadrant, then you must SUBTRACT the 30 from 180 to get the correct angle, i.e., 150 degrees. The same applies to that angle in the 3rd quadrant....you must ADD the angle to 180 to get the correct angle, i.e., 210 degrees.

I hope this helps.

CPhillMar 14, 2014

Dms:
juicybebe101:
its 6 you multiply the two powers

Hello! The answer "6" is wrong. This could be 6 if it was e^((ln(3)+ln(2)).
You can write e^((ln(3)*ln(2)) as:

3^(ln(2))
or

2^(ln(3))

So, the final result is: 2.1414860639032773

Dms