Sunday
April 20, 2014

Posts by SARA


Total # Posts: 3,531

biochemistry
If you make up a solution of 100 mL of 0.1 M HEPES in the basic form, what will be the pH? I have no idea where to even start...

psy/300
What are the positive aspects of peer groups during adolescence? Which of Erikson's stages describes the psychological issues of adolescence.

chemistry
thank you

chemistry
thank you

chemistry
Freshman in clooege decides to try her hand at pickling olives. According to the recipe, she needs to add 3 tsps. of salt to 1 cup diced olives. She erroneously adds 6 tsps instead. Each tsp weighs about 5g and contains 2300 mg of sodium. Determine the amount of sodium added i...

calculus
Thanks Steve, I didn't know how to use this function on the calculator.

calculus
calculate y = log_10(x) where x = 0.3

chemistry
Thanks, That's it!

chemistry
that is very true. What I was asking involves something like this as an example: 30mg/kg*1000g / 1kg* 1g /1000mg 30-/kg* 1000-/1-* 1g/1000- 30 * 1000/1000 * 1g = 30g

chemistry
Tell me what you think: I wrote #kg = 297mg / 3.5 mg/kg the mg's would eliminate each other and you are left with 297 / 3.5 kg = 85 kg.

chemistry
The physician has prescribed a medication of 3.5 mg/kg of body weight. If you give 297 mg of medication what is body weight of patient in kg? Is there a converstion formula?

Chemistry
I'm sorry, let me re ask this question and tell you what I've come up with ( I work 11pm-7am and do not sleep in daylight hours) Given 30mg/kg and need grams per dose with dosage every twelve hours. Here's what I've attempted: need to change mg/kg to grams --&g...

Chemistry
The question just gives me the dosage of 30 m/kg for every twelve hours and asks what the dosage would be in grams.

Chemistry
I need the equation for determining how to decide : You are given a dosage of 30m/kg to be given every twelve hours, how much is given (in grams) with each dose. I know the answer is obviously 15 m/kg but what is it in grams?

algebra
amanda weighs 3/4 as much as er ister. if amanda weighs 129 how musch does her sister weigh? how do you write the equation with x being the sisters weight.

Math
The vertices of an isosceles triangle are A(3, 6), B(7, 2), and C(4, 3). What is the equation of the triangle's line of symmetry? y= x+1 y= x-1 y= x y = -x+1

math
a rectangular swimming pool is 15 yds x 25 yds. the bottom of the pool needs to be repainted. if it costs $4.25 per square foot to paint the pool, give the cost to repaint the bottom of the pool.

Statistics-Confidence Interval
Can someone please help me on how to work this out?? I'm so super confused. Thanks! A professor at Kaplan University claims that the average age of all Kaplan students is 36 years old. Use a 95% confidence interval to test the professor's claim. Is the professor's ...

Chemistry
What is the net ionic equation for this reaction? 2MnO4 (aq) + 5H2C2O4 (aq) + 6H(aq)----->10CO2 (g) + 2Mn(aq) + 8H2O(l)

statistics
Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more?

precalculus
thank you my precalculus is now done - chemistry is next- can't wait!!

precalculus
given functions f,g, and h find f o g o h state exact domain. show work f(x)=1/x g(x)=lnx h(x)=2x+15

precalculus
these are hard to do - thank you

precalculus
verify the functions are inverses of each other by showing that f(g(x)) =x show work. f(x)=6/1-x g(x)= 1- 6/x

precalculus
I'm going to do this on my own, but I would like to check mine against yours - give me today to work on it and I will be able to compare. List all possible rational zeros for the polynomial find all real zeros and factor completely. show work f(x)=3x^4-29x^3+89x^2-75x-36 t...

precalculus
x/4x+1 < 5x/6 solve the inequality answer in interval notation and show work - thanks

precalculus
Thanks Reiny - you have rescued me again

precalculus
solve logarithmic equation in exact form only. show work. log_5(x-3)+ log_5(x-6)-log_5(x+1)=2

precalculus
thanks again

precalculus
solve exponential equation. express in exact form. e^x-42e^-x= -19

precalculus
solve the inequality please x^4-6561>0 So far I have come up with x^4>9^4. I guess what's throwing me is the answer has to be in interval notation and for the life of me, I can't remember what that is! (for me, it used to be a blond moment - now I'm gray with...

precalculus
find the inverse of function f(x)=4-2ln(x+1). state domain, range and any asymptotes of both

precalculus
Reiny: Thanks for the websites - they have helped immensely.

precalculus
given the following rational function f(x)= x^2+5x-7 / x-4 state domain, find vertical, horizontal and oblique asymptotes if any. I found the domain to be (-inf.,4)U(4, inf.) and vertical asymptote at x=4 am I right? can someone help me with the rest?

precalculus
Thanks, Steve - I cn never get my graphs right - I get all the work, but to draw?! forget it.

precalculus
sorry-operating on no sleep for at least 24 hours! f(x)=(x+3)(x-1)^2 analyze x and y intercepts; end behavior and maximum number of turning points.

precalculus
analyze the graph of f(x)=(x+3)x-1)^2 x and y itercepts; end behavior; and maximum number of turning points

precalculus
have to graph the following piecewise function stating values for f(0) and f(-2) {-x-2 if x<=-1 f(x)={3 if -1<x<=1 {2x+5 if x>=2

precalculus
drwls, I should have told you that I do the work myself and with your answers, I confirm what I've done or prove I know nothing--Thanks for your time.

precalculus
another one where I need points to graph please. f(x)=(7/5)^(3-x).

precalculus
I have the problem 2e^x = squareroot(10e^x) +3. the solution must be in exact form only.

precalculus
I'm sorry, started a new job and have put in a lot of hours for training - must have forgotten that you replied.

precalculus
how would I find points to plot a graph for the function f(x)=ln(4-x)?

precalculus
sorry about that squre root (10e^x) +3

precalculus
solve the exponential equation express in exact form only show all work. 2e^x= squareroot 10e^x +3

precalculus
solve the logarithm equation show work. log_7(x-8)- log_7(x-2)=1

precalculus
write the expression below as a single logarithm show work. ln(x-7/x^2+12x+36)-ln(x^2-49/x+6)

precalculus
use properties of logarithm to find the exact value of the expression. squareroot log_2/9(2/9)

pre-calculus
solve equation show work. log_2(x^2+47)=7

calculus
graph this function and determine the domain,range and vertical asymptote. f(x)=In(4-x) no need to graph just assist with points

math
graph the function below. Determine the domain, range, and horizontal asymptote. show work f(x)=(7/5)^(x-3)

math
verify that the function f and g are inverse of each other by showing f(g(x)) and g(f(x)) =x f(x)= 6-2/5x g(x)=15-5/2x

math
find the components f and g so that f og=H H(x) = (1/x+1)^15

math
Reiny, that is correct, but I cannot type the squareroot sign with my computer - how do I find the domain, of this function?

math
for the given functions f and g find f o g and state the domain show all work f(x)=sqrt x-3 g(x)=x^2-7x+9

Math
Suppose you have 100ft of fence to make a play area for your dog. Does a square or circle provide more area? What other factors might you take into consideration in designing your play area?

Math
A rectangular room measures 15ft by 21ft. How much will it cost to carpet this room if carpeting costs $17.95 per square yard?

precalculus
solve the following exponential equation. show all work. 4^(4x+2)= 1/64

precalculus
write the expression as a sum or difference of logarithms. express powers as factors show all work log4 sqrt pq/7

precalculus
solve the following equation show all work log4(x-4)= -1.

precalculus
given the function y=2-log(x) find domain, determine vertical asymptote and show work.

precalculus
the following function is one-to-one find its inverse. find domain and range of f and f^-1 show work f(x)=^3sqrt(x-3)

precalculus
use transformation to graph the following function - state domain, range and horizontal asymptote f(x)= e^5x.

precalculus
find the exact value of the following logarithm. Use the properties of logarithms show all work. log2 34-log2 17 (Those are little two's)

precalculus
log5 (x+3)= 1- log5 (X-1) where do I start?

algebra
your problem with the oil slick is very helpful but all I need is A of the oil slick as a function of the time t. the radius in feet of the spread after t hours is r(t)= 200sqrt t.

History
The Federal government has a lot of programs in place to hire the Natives and this is often run by the Bureau, however, if this is in place, why aren't these Indians getting the benefits. Who is swindling the money?

Cultural diversity
Sorry I have auto correct on my phone and I thought I changed it back but it was supposed to say.. swindling not swinging. Here is what is was supposed to say- The Federal government has a lot of programs in place to hire the Natives and this is often run by the Bureau, howeve...

Cultural diversity
The federal government has a lot of programs in place to hire the Natives and this is often run by the Bureau,however, if this is in place, why army the Indians getting the benefits? Who is swinging the money?

statistics
marbles come in 10 different varieties and there are 15 marbles in a pack.how many packs must a person buy in order to be sure of having at least 10 of one kind?

Biology - Evolution
Ms. Sue, i already searched on wikipedia but i couldn't able to find any information.

Biology - Evolution
In one sentence each, describe a) one positive effect of direct artificial selection b) one negative effect of direct artificial selection c) one negative effect of indirect artificial selection

Calculus
Calculate the height of a cylinder of maximum volume that can be cut from a cone of height 20 cm and base radius 80 cm , please help me

College Algebra
what is the domain of each of the following functions,their intercepts and thier range? f(x)=x+3 and f(x)=-2x-3 if x<-2 and x>=-2

math
Thank you : )

math
Michel wants to buy his mother handmade chocolates for Mothers Day. He has $15.oo to spend. The price of each chocolate is given below. Fudge $0.60 NutClusters $0.75 Truffles $0.80 a)create and solve an equation for each type of chocolate to determine how many Michel can buy w...

Math-Data Mangment
6(n+1P2)=3nP2

math/ algebra
how can i find the numbers Quadratic equation the sum of 2 whole numbers is 23. their product is 120. find the numbers

Career planning
When considering a post-secondary option, you should consult which of the following sources?

statistics
A life insurance salesman sells on the average 3 life insurance policies per week. What type of this distribution is? (2 marks) Let in a given week, calculate probability of the salesman will sell, i. at least one policy. (2 marks) ii. from two to four policies. (3 marks) iii....

biology
its B

chemistry
How many moles of NH3 are produced from 48.5 g of H2?

chemistry
How many grams of N2 are needed to react with 125g of H2?

chemistry
How many grams of NH3 can be made from 375g of N2?

statistics
A study was made of 413 children who were hospitalized as a result of motor vehicle crashes. Among 290 children who were not using seat belts, 50 were injured severely. Among children using seat belts, 16 were injured severely (based on data from “Morbidity Among Pediatri...

physics
A stone tumbles into a mineshaft and strikes bottom after falling for 4.2 seconds. How deep is the mineshaft?

physics
A water balloon was dropped from a high window and struck its target 1.1 seconds later. If the balloon left the person’s hand at –5 meters/sec, what was its velocity on impact?

chemistry
what must be done with the radioactive waste materials that result from splitting atoms and how is this a problem?

Astronomy
The distance between the Earth and Mars when the two panets are at opposition varies greatly because of the large eccentricity of Mar's orbit. The perihelion distance of a planet is given by rmin=a(1-e)and the aphelion distance by rmax=a(1+e) where a is the semimajor axis ...

biology
another way to afect the enzyme is lowering the pH of the solution. However, lactase is supposed to be able to work in the stomack. Would lowering the pH of the enzyme solution affect the enzyme? Why or why not?

Western Civ
Help! Describe the evolutionary account of the emergence of Israelite religion paying particular attention to the ideas of covenant, law, prophets, morality, relations with Canaanite culture, and other themes you deem significant. Also explain how Jewish scripture was put toge...

6th grade ELA
nnnnnnnoooooooooooooo

6th grade ELA
nnnnnnnoooooooooooooo

writing
Mother sewed fur jackets for Father and me

writing
how do you do that? that's what I dont get?

writing
is this a correct way to write this sentence Mother sewn fur jackets for Father and I, just in case the weather gets bad. thank you!

writing
its an exploration narrative journal im writing about seeing the grand canyon for the first time

writing
is there another way to rephrase this sentence in a good way. --- All I ever heard about this Grand Canyon thing was that it is piled up with humongous rocks and composed of fossils. thank you!

Calculus
Thanks Steve.

Calculus
Please help me with the following 2 questions. 1. Find the area of the curved surface of a right-circular cone of radius 6 and height 4 by rotating the straight line segment from (0,0) to (6,4) about the y-axis. 2. Use the Maclaurin polynomial of degree 4 to approximate sin(0....

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