Member: Melody

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

+118725

Katy:
Wait , hold on hold on

Why 3x ? How 'bout Mary?

It doesn't say anything about how much Mary gets in the questions. It only says that Nick gets twice as much as Joseph and Alice gets 40.
the ratio of Joseph's share to nick's share is 1:2 If Joseph gets x lollies then Nick gets 2x lolllies. x+2x=3x. Mary gets whatever is left over.

The MOST that Joseph can get is 53. He could get a lot less.

Does that help

MelodyMar 14, 2014

+118725

Katy:
MARY HAD 200 SWEETS WITH HER. SHE SHARED THE SWEETS WITH JOSEPH, NICK
AND ALICE. ALICE GETS 20% OF THE SWEETS.NICK GETS TWICE MORE SWEETS THAN JOSEPH. HOW MUCH SWEETS DOES JOSEPH GETS?

A. 79 SWEETS
B. 89 SWEETS
C. 78 SWEETS
D. 90 SWEETS
E. 100 SWEETS
Help me

4 people are sharing 200 sweets

Alice gets 20%
20% of 200 = 20/100*200=40lollies
So there are 160 left for the others to share.

Let Joseph get x lollies
Nick gets twice that many so he must get 2x lollies
we don't know how many Mary gets.

Nick +Joseph = 3x lollies and I guess Mary will get some as well.
So
3x < 160
x < 53.3
I don't think that any of those answers are correct. The most sweets that Joseph can get is 53. He could get less than that but he can't get more.

If Joseph gets 53, nick gets 106, Alice gets 40 Mary only gets 1.

MelodyMar 14, 2014

+118725

soxajn:
i am going to exam next week an cant use the internet so i want to know if it is possible to download this as a ofline software?

I am not terribly familiar with the calculator but I do not think that is possible. Sorry.

MelodyMar 14, 2014

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