Sunday

November 23, 2014

November 23, 2014

Total # Posts: 2,902

**Math(Quick question)**

The function D(h)=7e^-0.4(h) can be used to determine the milligrams D of a certain drug in a patient's bloodstream h hours after the drug has been given. How many milligrams will be present after 9 hours. Round three decimal places. so 7e^(-0.4 x 9) = .191 To get this ...
*November 3, 2010*

**Math(Please check)**

O ok I understand. Thanks!!
*November 3, 2010*

**Math(Please check)**

So what is the inverse?
*November 3, 2010*

**Math(Please check)**

The following function is one-to-one; find its inverse f(x)=x^3+5 I know that the first step would be to set y = to x so I did y=x^3+5 Then you swap x with y so x=y^3+5. Then you solve for y and this is where I think i messed up. I did y^3=x-5 = y=x^3-5 Then the inverse would ...
*November 3, 2010*

**Maths**

What is dy/dx of e^-x ?
*November 2, 2010*

**elementary functions**

(x-4)(x+1)
*November 2, 2010*

**algebra**

1. (4x-3)(x-1) 2. Use the quadratic formula which you can find on youtube.
*November 2, 2010*

**Maths**

if f(x) = 2x - x ln x show that f(e^3) = -e^3 I know you have to substitute e^3 into the function, so Ive sone ths so far: 2e^3 - e^3 ln e^3 What is the next step?
*November 1, 2010*

**MATH**

you do do 24 divided by 8 and then times it by 7.
*November 1, 2010*

**Maths**

if f(x) = 2x - x ln x show that f(e^3) = -e^3 I know you have to substitute e^3 into the function, so Ive sone ths so far: 2e^3 - e^3 ln e^3 What is the next step?
*November 1, 2010*

**Calculus **

Determine whether the integral is divergent or convergent. If it is convergent, evaluate it and enter that value as your answer. If it diverges to infinity, state your answer as "INF" (without the quotation marks). If it diverges to negative infinity, state your ...
*October 22, 2010*

**Calculus **

Find the area between the curves y=(x^3)-10(x^2)+24x and y=(-x^3)+10(x^2)-24x
*October 22, 2010*

**Calculus **

Apparently it diverges to negative infinity. Can someone please explain to me why?
*October 22, 2010*

**Calculus **

Determine whether the integral is divergent or convergent. If it is convergent, evaluate it and enter that value as your answer. If it diverges to infinity, state your answer as "INF" (without the quotation marks). If it diverges to negative infinity, state your ...
*October 22, 2010*

**History**

34. Designed as an attempt to secure the loyalty of the French to their new rulers, this act broke new ground in toleration and statesmanship. Unfortunately for the British, the Americans saw only sinister designs. This act was the a. Treaty of Paris, 1783 b. Tea Act c. Statue...
*October 22, 2010*

**social studies**

What is an example of Human-Environment Interaction in Vatican City?
*October 20, 2010*

**Physics**

Oh gotcha. But how come friction=centripetal force? I thought since net force is towards the center they can't cancel each other out like that...
*October 19, 2010*

**Physics**

How come a heavy truck and a small car can both travel safely at the same speed around an icy, banked-curve road? I would think that since mass is increased, normal force is therefore increased, and force of friction is therefore increased. And since the opposing force, the ...
*October 19, 2010*

**physics**

(a) 264 (b) 461.49 (c) 0
*October 18, 2010*

**Algebra**

A saline solution was made by mixing 11 ml of a 36% saline solution and 6 ml of a 53 % saline solution. How do I find the consentration of the new mixture?
*October 18, 2010*

**6th grade math**

what is the answer showing work to 8(2h-10)=16h
*October 17, 2010*

**Chemistry**

nevermind i got it. thanks
*October 14, 2010*

**Chemistry**

What are the charges of the ions in an ionic compound containing iron(III) and fluoride ions? a)iron(III)- i got 3+ b) flouride- im not sure on this one c)Write the formula for the compound. (Type your answer using the format CO2 for CO2.) - Fe3F2... i rly have no idea on this...
*October 14, 2010*

**repost-chem**

ok. thanks. I have a question about it that i posted on my previous post. think u could check it out? thanks
*October 13, 2010*

**repost-chem**

Write a formula for the compound that forms from barium and the following polyatomic ion. (a) hydroxide (b) carbonate (c) phosphate (d) hydrogen phosphate basicaly all i know is that all of these are going to start with Na. I need major help! thanks:)
*October 13, 2010*

**chemistry**

I get the first 2 but how did u get the second two?
*October 13, 2010*

**chemistry**

Write a formula for the compound that forms from barium and the following polyatomic ion. (a) hydroxide (b) carbonate (c) phosphate (d) hydrogen phosphate basicaly all i know is that all of these are going to start with Na. I need major help! thanks:)
*October 13, 2010*

**Math**

Find the equation for the line with the following. parallel to the line 8x+7y=-7 and containing the point (7,-7) Since it it parallel the equation would have to have 8x, right? Then im not sure what to do.
*October 7, 2010*

**Math**

Find all points having x-coordinate 9 and distance 10 from the point (3,-2). Would I use the distance formula here?
*October 7, 2010*

**Math**

So for the diameter I got 136. This that right?
*October 7, 2010*

**Math**

Find the center and the radius of the circle which (6,-2) and (-4,4)are endpoints of a diameter. Please help!
*October 7, 2010*

**Math**

Find the requested function and state its domain: f(x)= 4x+3 g(x)=4x-5 Find f/g and its domain. So I did 4x+3/4x-5, so the 4x's cancel out and 3/-5 is left. So my answer is 3/-5. Is this correct Now I just need to find the domain which I am not to sure about.
*October 7, 2010*

**math**

how can you use rounding to estimate 331+193
*October 7, 2010*

**Math**

I got y=-10/3 x + b Then I used (-5,4) so 4=-10/3(-5) + b and I got y=-10/3x - 46/3. I am not sure if I multiplied and added the fractions correctly
*October 7, 2010*

**Math**

Find an equation for the line with the given properties. Containing the points (-5,4) and (-2,-6) Please help!
*October 7, 2010*

**Math**

Given the function f(x)= x^2-3 / x+1, what point on the graph corresponds to x=-2? I have no idea what to do. Am I suppose to plug in -2 into the equation?
*October 7, 2010*

**Math**

Find the requested function and state its domain: f(x)= 4x+3 g(x)=4x-5 Find f/g and its domain. So I did 4x+3/4x-5, so the 4x's cancel out and 3/-5 is left. So my answer is 3/-5. Is this correct Now I just need to find the domain which I am not to sure about.
*October 7, 2010*

**Math(Please check)**

Determine whether the graph of the following equation is symmetric with respect to the x-axis, the y-axis, and the origin. y^2 - x - 49 = 0 For x axis -y^2 - x - 9 = 0 is not the same as the first equation so it is not symmetrical to the x-axis. Correct? For the y-axis y^2 + x...
*October 7, 2010*

**Math(Please, Please, help)**

Nevermind,I did not realize that my question was already answered.
*October 7, 2010*

**Math(Please, Please, help)**

For f(x) = 2x-3 and g(x)= 2x^2 find, a) (f + g)(x) = My answer is 2x^2 + 2x - 3. Is this correct? b) (f - g)(x) How would you do this? c) (f X g)(2) I do not know what to do since the 2 is there. Determine whether the graph of the following equation is symmetric with respect ...
*October 7, 2010*

**Math**

For f(x) = 2x-3 and g(x)= 2x^2 find, a) (f + g)(x) = My answer is 2x^2 + 2x - 3. Is this correct? b) (f - g)(x) How would you do this? c) (f X g)(2) I do not know what to do since the 2 is there. Determine whether the graph of the following equation is symmetric with respect ...
*October 6, 2010*

**Math(Please check)**

why 9?
*October 6, 2010*

**Math(Please check)**

Find the center (h,k) and radius of the following circle. x^2 + y^2 - 6x - 2y + 1 = 0 My answer is center= (-3,-1) and radius of 1. Am I correct?
*October 6, 2010*

**Math(Please help)**

Sorry I wanted to add something else! Determine whether the graph of the following equation is symmetric with respect to the x-axis, the y-axis, and the origin. y^2 - x - 49 = 0 For x axis -y^2 - x - 9 = 0 is not the same as the first equation so it is not symmetrical to the x...
*October 6, 2010*

**Math(Please help)**

For f(x) = 2x-3 and g(x)= 2x^2 find, a) (f + g)(x) = My answer is 2x^2 + 2x - 3. Is this correct? b) (f - g)(x) How would you do this? c) (f X g)(2) I do not know what to do since the 2 is there.
*October 6, 2010*

**Math**

Find the slope intercept form of the line with the following properties. Slope=4 containing the points (-2,-5) I know that slope intercept form is y=mx+b so the m is the slope which is 4 but now I get confused since they give me x any y values (-2,-5). Is it just y which is -5...
*October 6, 2010*

**Math**

These questions that I have completed are on a test review for my exam and I would just like to know if they are correct. These are only a few of the questions, I have more that are just not complete yet. Thank You! 1) List the intercepts for the graph of the following ...
*October 6, 2010*

**Math(Please check answers)**

These questions that I have completed are on a test review for my exam and I would just like to know if they are correct. These are only a few of the questions, I have more that are just not complete yet. Thank You! 1) List the intercepts for the graph of the following ...
*October 6, 2010*

**Math**

Find the slope intercept form of the line with the following properties. Slope=4 containing the points (-2,-5) I know that slope intercept form is y=mx+b so the m is the slope which is 4 but now I get confused since they give me x any y values (-2,-5). Is it just y which is -5...
*October 6, 2010*

**Math(Please help)**

Thank You!!
*October 5, 2010*

**Math(Please help)**

Write an equation of the line satisfying the given condition. a) x intercept = 3 y intercept=-2 I am really not sure how to start here. b) vertical line containing (5,-1) Would it be y=5x-1? c) parallel to the line 3x-4y=5 and containing the points (3,-6) . I know that the ...
*October 5, 2010*

**Math**

Write an equation of the line satisfying the given condition. a) x intercept = 3 y intercept=-2 I am really not sure how to start here. b) vertical line containing (5,-1) Would it be y=5x-1? c) parallel to the line 3x-4y=5 and containing the points (3,-6) . I know that the ...
*October 5, 2010*

**algebra**

oops the right numbers are suppose to be under the x
*October 5, 2010*

**algebra**

like jannie said.. so your table would look something like _y____x_ -2 -5 -1 -4 0 -3 1 -2 2 -1 3 0 4 1 you can basically choose any number you want x to be then find y
*October 5, 2010*

**Math**

yes its correct!
*October 5, 2010*

**Math**

Yep:) that is the correct answer
*October 5, 2010*

**Math**

does 2-6=2?
*October 5, 2010*

**Math**

Hm... i posted on here.. idk y its not here but.. Ok so we know that the ones place has to be 2more than the tens place so which number has ones place-tens place=2?
*October 5, 2010*

**Math**

State whether the equation defines y as a function of x. a) y=x^2-2x Yes b) y^2 = 3x-4 No c) 5x+7y=10 Yes Are my answers correct?
*October 5, 2010*

**Math(Please check! Thank You)**

List the intercepts and test for symmetry. y^2 - x - 4 = 0 I got (-4,0) and (0,2) for the intercepts. -y^2 - x - 4 = 0 Is not symmetrical to the x axis, correct? y^2-(-x) - 4 = 0 Is not symmetrical to the y axis, correct? -y^2 + x - 4 = 0 Is not symmetrical to the origin, ...
*October 5, 2010*

**Math(Please check)**

Lsit the intercepts and test for symmetry. y^2 - x - 4 = 0 I got (-4,0) and (0,2) for the intercepts. -y^2 - x - 4 = 0 Is not symmetrical to the x axis, correct? y^2-(-x) - 4 = 0 Is not symmetrical to the y axis, correct? -y^2 + x - 4 = 0 Is not symmetrical to the origin, ...
*October 5, 2010*

**Math**

2w-4/2w the only factor of 1 is 1. I dontknow how they want you to solve this with only factors of one. but you could divide both sides by 2. so you get w-2w
*October 3, 2010*

**Math**

the scientific notation would be: 8.17X 10^7 in scientific notations the decimal always has to be after the first non-zero number
*October 3, 2010*

**chemistry**

what is the equation for gamma decay?
*October 3, 2010*

**algebra**

the answer would be: -36s^2q. the s is squared and the q not because your multi. SQ*3S. so there are 2 S's but only one q.
*October 3, 2010*

**graph on excel**

oops the numbers after the 1,2,3 etc. are suppose to be in the right column
*October 3, 2010*

**graph on excel**

ok so I did a radiation and distance lab: this is my results: Distance(cm) Counts(30 sec) 0 1729 1 634 2 391 3 239 4 150 5 124 6 114 7 82 8 58 9 62 10 60 11 36 12 45 so it asks me to make new columns on excel titled the following:(note: the 2 and 3 are superscripts) 1/distance...
*October 3, 2010*

**Math**

Thank You!
*October 2, 2010*

**Math**

Find the intercepts of the equation y=2x-1 by plotting points. To plot this would I just plot 2,0 and then go down 1?
*October 2, 2010*

**Math(Please help)**

Determine whether the points (0,3)(-2,0)(2,7) are on the graph of the equation y = x^3 - 2x +3? How would I do this?
*October 2, 2010*

**physics**

Surprisingly, very few athletes can jump more than 2.6 ft (0.8 m) straight up. Use d = 1/2 gt2 and solve for the time one spends moving upward in a 2.6 foot vertical jump. Then double it for the "hang-time" -- the time one's feet are off the ground.
*September 30, 2010*

**physics**

Consider a pair of forces, one having a magnitude of 48 N, and the other 43 N. What maximum net force is possible for these two forces?
*September 30, 2010*

**Pre-Calc**

A rectangular package to be sent by a delivery service can have a maximum combined length and girth (perimeter of a cross section) of 120 inches. a. Show that the volume of the package is V(x)= 4xsquared(30-x) b. Use your graphing calculator to find the dimensions of the ...
*September 26, 2010*

**Math(Please help)**

The first one x=2sqrt(6x-36)
*September 20, 2010*

**Math(Please help)**

I know I posted this yesterday but I really do not understand this and I did not quite understand the comment on what to do. Find the real solutions of the equation. x = 2 sqrt6x-36
*September 20, 2010*

**Math(Please check)**

Find the real solutions by factoring. 7x^3 = 2x^2 x^2(x+7) = x(x+2) x=0 x=-7 x=-2 Is this correct?
*September 20, 2010*

**Math(Please help)**

Find the real solutions of each equation. 1) 1 / (x+6)^2 = 1 / (x+6) + 12 2) 8x^2/3 - 39x^1/3 - 5 = 0 I have no idea how to do these. Please help!!! Thank you!
*September 20, 2010*

**SCIENCE!!**

10m/s i believe and that is going up and down if you neglect air resistance
*September 20, 2010*

**Math**

I know I posted this yesterday but I really do not understand this and I did not quite understand the comment on what to do. Find the real solutions of the equation. x = 2 sqrt6x-36
*September 20, 2010*

**Math(Please help)**

Would x be $4,583.33? From the equation x(o.17) + (70,000-x)(0.07) = 6,000 I got 0.17x + 4,900 -0.07x = 6,000 and then I subtracted 4,900 from 6,000 and I added 0.07 to 0.17 and got 0.24x. Is this correct?
*September 19, 2010*

**Math(Please help)**

Betsy, a recent retiree, requires $6,000 per year in extra income. She has $70,000 to invest and can invest in B-rated bonds paying 17% per year or in a CD paying 7% per year. How much money should be invested in each to realize exactly $6,000 in interest per year? I do not ...
*September 19, 2010*

**math(Please help)**

Betsy, a recent retiree, requires $6,000 per year in extra income. She has $70,000 to invest and can invest in B-rated bonds paying 17% per year or in a CD paying 7% per year. How much money should be invested in each to realize exactly $6,000 in interest per year? I do not ...
*September 19, 2010*

**math(Please check)**

Find the real solutions of the equation: 14x^2 - 5x^2 - 1 = 0 I know that you have to use au^2 + bu +c = 0 so u^2 - 5x -1 which is prime. So would the answer be that the solution is the empty set?
*September 19, 2010*

**math(please help)**

Find the real solutions of each equation. x=2 srqt 6x-36 I do not know where to start.
*September 19, 2010*

**Math(Please check)**

or A=pi r^2
*September 19, 2010*

**Math(Please check)**

Translate the following sentence into a mathematical equation: "The area, A, of a circle is the product of the number pi and the square of the radius, r." A=pi X r^2 Is this correct?
*September 19, 2010*

**math**

There are 18 students standing in a circle, evenly spaced and consecutively numbered. Which student is directly opposite student 1
*September 19, 2010*

**chemistry**

huh? what set up that u did? wait r u bobpursley?
*September 15, 2010*

**chemistry**

thanks. what about: block of aluminum with a volume of 98.2 cm3 absorbs 67.4 J of heat. If its initial temperature was 32.5 °C, what is its final temperature? (density of aluminum = 2.70 g/cm3) I know i have to change the volume to grams. but i dont know how to lay out the...
*September 15, 2010*

**chemistry**

A 43 kg sample of water absorbs 343 kJ of heat. If the water was initially at 22.1°C, what is its final temperature? I got 1.9 but i think i didn't do it correctly
*September 15, 2010*

**chem.**

oh, would it be 24 (two sig figs) cause in the problem 43 has the least number of sig figs(2) or do we go by this equation: 343,000 = 43,000 x 4.184 x (Tf-22.1) = 0 and use 3 sig figs?
*September 15, 2010*

**chem.**

thank you so much!!
*September 15, 2010*

**Physics**

when i solve for t I get an extremely small number like .1998. I don't think I am setting up the problem right or something.
*September 13, 2010*

**Physics**

At t = 0, a stone is dropped from a cliff above a lake; 2.0 seconds later another stone is thrown downward from the same point with an initial speed of 33 m/s. Both stones hit the water at the same instant. Find the height of the cliff.
*September 13, 2010*

**college: psychology**

3. Define proactive & retroactive inhibition. Create a memory strategy to help you remember & discriminate between them. Explain this strategy well enough so that a reader could learn to use it.
*September 13, 2010*

**conversion**

a)339 Cal to kilowatt-hours
*September 11, 2010*

**6th grade science**

you are right!<:
*September 11, 2010*

**Geography**

I'm confused. What's this article got to do with the question I posted. The website has to do with the rainforest
*September 10, 2010*

**Geography**

This is my last question that I'm struggling with. We had to do 25 of them and this one I can't figure. Thank you for your help. It's greatly appreciated. Have a great weekend!!! More water flows through the Amazon Basin than through any other river system. ...
*September 10, 2010*

**Geography**

Due to the violent & complex origins of the Andies, many rich & precious metals and minerals were found in the Andies. The inital economic wealth of many Adean coutries came from mining gold, silver, tin, copper, and iron. How can this cause conflict with other nations?
*September 10, 2010*

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