Friday
April 18, 2014

Posts by Hannah


Total # Posts: 2,802

Math
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 an...

Math
Find the x and y intercepts of the following function. f(x) = 9x - x^3

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 an...

Math(Please check)
O ok I understand. Thanks!!

Math(Please check)
So what is the inverse?

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 ...

Maths
What is dy/dx of e^-x ?

elementary functions
(x-4)(x+1)

algebra
1. (4x-3)(x-1) 2. Use the quadratic formula which you can find on youtube.

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?

MATH
you do do 24 divided by 8 and then times it by 7.

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?

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 answ...

Calculus
Find the area between the curves y=(x^3)-10(x^2)+24x and y=(-x^3)+10(x^2)-24x

Calculus
Apparently it diverges to negative infinity. Can someone please explain to me why?

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 answ...

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...

social studies
What is an example of Human-Environment Interaction in Vatican City?

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...

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 ce...

physics
(a) 264 (b) 461.49 (c) 0

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?

6th grade math
what is the answer showing work to 8(2h-10)=16h

Chemistry
nevermind i got it. thanks

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...

repost-chem
ok. thanks. I have a question about it that i posted on my previous post. think u could check it out? thanks

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:)

chemistry
I get the first 2 but how did u get the second two?

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:)

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.

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

Math
So for the diameter I got 136. This that right?

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

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.

math
how can you use rounding to estimate 331+193

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

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

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?

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.

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...

Math(Please, Please, help)
Nevermind,I did not realize that my question was already answered.

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 t...

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 t...

Math(Please check)
why 9?

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?

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...

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.

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...

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 equatio...

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 equati...

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...

Math(Please help)
Thank You!!

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 lin...

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 lin...

algebra
oops the right numbers are suppose to be under the x

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

Math
yes its correct!

Math
Yep:) that is the correct answer

Math
does 2-6=2?

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?

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?

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, cor...

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, corr...

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

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

chemistry
what is the equation for gamma decay?

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.

graph on excel
oops the numbers after the 1,2,3 etc. are suppose to be in the right column

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...

Math
Thank You!

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?

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?

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.

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?

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 packa...

Math(Please help)
The first one x=2sqrt(6x-36)

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

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?

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!

SCIENCE!!
10m/s i believe and that is going up and down if you neglect air resistance

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

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?

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 kn...

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 kn...

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?

math(please help)
Find the real solutions of each equation. x=2 srqt 6x-36 I do not know where to start.

Math(Please check)
or A=pi r^2

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?

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

chemistry
huh? what set up that u did? wait r u bobpursley?

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...

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

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?

chem.
thank you so much!!

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.

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.

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.

conversion
a)339 Cal to kilowatt-hours

6th grade science
you are right!<:

Geography
I'm confused. What's this article got to do with the question I posted. The website has to do with the rainforest

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