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#2 Help Me ! » Rate of change problem » 2013-08-22 08:34:39

AlbertMThomas
Replies: 2

The volume of an empty container is 15 m³. If water is poured into the container at a rate of 2t + 2 m³ per minute where t is the time. What is the time needed to fill the container?

#3 Re: Help Me ! » Differentiation problem » 2013-08-22 01:08:23

Can we say it is impossible to find the slope, and why??
If this is an undulation then all what we did is wrong.. How can the solution be then??

The multiple choices for the answer are:
{A} 16
{B} 1
{C} 7
{D} 67
{E} It is impossible to say without knowing the exact value of the given information

#4 Re: Help Me ! » Differentiation problem » 2013-08-22 00:11:01

A QUESTION: CAN A GRAPH contain MORE than one INFLECTION point? and WHY?

Here is the graph for the function:

Where is the inflection point in it??
and If it doesn't contain infliction point how can I make sure of that as I don't see the whole graph??

What I tried, but I am sure this is a wrong answer:
f(x)= 2x^4 - 512x² - 7x - 28
f'(x)= 8x³ - 1024x - 7
f''(x)= 24x² - 1024
at inflection point f''(x)= 0 ⇒ 24x² - 1024 = 0
x=±(8√6)/3
then the value of the tangent at B is [f'(x)]"at x= (8√6)/3" = 8[(8√6)/3]³ - 1024[(8√6)/3] - 7 = -4466.159994

THIS IS WRONG ANSWER as it seems to be there is no inflection point

#5 Help Me ! » Differentiation problem » 2013-08-21 22:09:10

AlbertMThomas
Replies: 8

Consider the function f(x)= 2x^4 - 512x² - 7x - 28. The function is plotted below. The tangents to the curve at the points A and C are shown. Find the value of the tangent at the point B if possible.

#6 Re: Help Me ! » Logarithms problem » 2013-08-21 22:05:13

LOL THANKS!! I reached the answer before! just needed to make sure if there is other ways

Thanks

#8 Help Me ! » Logarithms problem » 2013-08-21 20:03:26

AlbertMThomas
Replies: 2

IF log2[log3(x²-7x+15)]=1, find x ... PLS PROVIDE STEPS?

#9 Help Me ! » Statics Problem... » 2013-08-21 19:54:28

AlbertMThomas
Replies: 2

A light triangular plate OAB is in a horizontal plane. Three forces, F1=4N, F2=12N, and F3=4N, act on the plate, which is pivoted about a vertical axis through point O. Find the torque (or "moment") of force F1 about the axis through point O.

I don't understand :"Find the torque (or "moment") of force F1 about the axis through point O"