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December 22, 2014

Posts by janet


Total # Posts: 355

Chemistry
What is the pH of a 0.0353M solution of NH4F and a 0.0000666M solution of NH4F?
April 20, 2012

Math Probability dice roll
two fair dice are rolled, find the A)odds of getting a 9 B) the odds against getting a 12
April 16, 2012

trig
171km
March 11, 2012

trig
City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?
March 11, 2012

trig
City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?
March 11, 2012

trig
City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?
March 11, 2012

language arts
that is actually true, but why is it so popular? could it be because of the brand name, or advertisement?
February 27, 2012

language arts
i'm doing a project on choosing some "status symbols" popular in society today. one status symbol i did was the restaurant called cheesecake factory, how do i explain how it is popular/important today?
February 27, 2012

Pre-Algebra Math
50
February 21, 2012

comparing group means
what appropriate null and alternative hypothesis would i use in this problem a teacher gives students a holding review session. did attending the session make a differnts in the final points in the class,give example of the appropriate statisical procedure
February 18, 2012

math
One number is 25% of another. The larger number is 12 more than the smaller. What are the numbers?
February 16, 2012

Algebra
The Hansons are considering two possible vacation destinations. A trip out west will cost $1075 in total airfare plus an average of %450 per day in expenses. A trip south will cost $1500 in total airefare plus an average of $365 per day in expenses. How many days should they ...
February 15, 2012

English Home Language
Can You Please Give Me Points as To How to add persuasive points to my speech " Women Should Rule The Way" I Already said they more Patient and better communcaters
February 10, 2012

5th grade math
A class consist of half as many boys as girls, if there are 14 boys how many girls are there
November 17, 2011

chemistry
the number of grams of KCI per 100g of water that would produce a saturated soluion at 50 degrees C is?
November 15, 2011

Geometry
need to find x x+153=130+2x+23
September 29, 2011

geometry
suppose m is b/t L and N. LM=4x+8, MN=9x-4, LN=82. what is x?
September 25, 2011

history
what was The Significance of Noah Webster thinking and writing
August 31, 2011

math
what is the least possible number you can weite with a 1 in the thousands place?
August 25, 2011

Chemistry
When oxygen expands from the liquid to gaseous state how much more volume does it occupy?
July 30, 2011

think build live success
I am currently enrolled in uma and Im trying to figure out my instructor because there is lack of commmunication on her part
July 24, 2011

College Math
Given the following sets select the statement that is NOT true. A=(l,a,t,e,r) B= (l,a,t,e) C=(t,a,l,e) D=(e,a,t)E=(t,e,a) E=D E=B D=A C=A D=B
July 15, 2011

statistics
Make up 20 hypothetical scores. Determine their mean, median, mode, and standard deviation.
June 24, 2011

maths
Please can you help me with this question? Choose the option which is a false statement: A arctan(tan2/3pi))=-1/3pi B arccos(cos(3/4pi))=3/4pi C sin(arcsin(-1/2pi))=-1/2pi D arcsin(1/2squareroot3)=1/3pi E arcsin(sin(3/4pi))=1/4pi F arccos (1/2squareroot2)=1/4pi
May 26, 2011

science
if a plane drops a bomb, does the bomb fall straight down, or behind or forward?
May 18, 2011

chemistry
A 14.0g of N2 occupies what volume atSTP
May 16, 2011

Calculus
THe demand funtion is modeled by D(q) = 56e^-0.000012q, where q is quantity and D(q) is price. What price will yield the maximum revenue? Prove this is a maximum using as qppropriate derivative test.
May 11, 2011

Calculus
Evaluate integral, don't use calculator. I'll use the S as the sign for integral S 4 sin (theta)d(theta) from pi/2 to pi I know the answer is 4 because I enter it in on my calculator, but don't know the steps to get to the answer. Please help.
May 9, 2011

Calculus
Yeah. Thanks for showing me the steps
May 9, 2011

Calculus
The area bounded between the line y=x+4 and the quadratic function y=(x^2)-2x. Hint: Draw the region and find the intersection of the two graphs. Add and subtract areas until the appropriate area is found. I found the intersection points as (-1,3) and (4,8). I'm not sure ...
May 9, 2011

Calculus
Thanks.
May 9, 2011

Calculus
Find the limit. lim x-->1 (x^3)-1/((5x^2)+2x-7) Please show steps.
May 9, 2011

calculus
Quadratic function written in standard form where a, b, and c are constants such that a is not zero. f(x)= ax^2+bx+c Using calculus find the vertex of the parabola formed by this quadratic function. Determine under what conditions this vertex is a maximum or minumum (using ...
May 8, 2011

math
Suppose a state lottery prize of $2 million is to be paid in 20 payments of $100,000 each at the end of each of the next 20 years. If money is worth 9%, compounded annually, what is the present value of the prize?
May 1, 2011

Algebra
Use the five steps for problem solving to answer the following question. Show all work. Andrew is having an irrigation system installed in his yard. Company A charges $1250 plus $15 per sprinkler head. Company B charges $1200 plus $17 per sprinkler head. How many sprinkler ...
April 28, 2011

Calculus--Please help.
Carry on with the problem.. To find maximum profit, not revenue, would I take the derivative of the profit function, which I have as Profit=125*(12L+29L^2-1.1^3)-7000L. If I take the derivative of this(which I'm not sure I did right) my L=16.78 or .79. If I plug it back ...
April 21, 2011

Calculus--Please help.
1. So this is the answer I got 12L+29L^2-1.1L^3=0 L(12+29L-1.1L^2)=0 L=0, 26.77, -0.41 The minimum number of laborers would be 0. The maximum number of laborers would be 26.77. THe range would then be (0,26.77) because when I substitute a number >26.77 into the above ...
April 21, 2011

Calculus--Please help.
I really need help, this is my second post. Information to solve problems Q=12L+29L^2-1.1L^3 Q= # of cars produced/year L=# of laborers used per year for production Each car sells for $125. $7000 per laborer per year is cost for labor and other consumable materials. Questions...
April 21, 2011

Calculus
Information to solve problems Q=12L+29L^2-1.1L^3 Q= # of cars produced/year L=# of laborers used per year for production Each car sells for $125. $7000 per laborer per year is cost for labor and other consumable materials. I attempted some parts of these questions and some ...
April 21, 2011

Calculus
Find any absolute max/min and local max/min for the function f(x)=x^3-4x+5 on the interval [0,5). Made sure to prove that these points are max/min values. This is what I did so far. f'(x)=3x^2-4=0 3x^2=4 x= 2/sqrt3 The -2/sqrt3 is outside of interval so can't use. x=2/...
April 18, 2011

Calculus
The position in meters of a particle is given by f(t)= 14t-3t^2, where t is measured in seconds. a) Evaluate f'(2) and interpret the results. This is how I solved this. f'(t)=14-6t= 2(7-3t) f'(2)=2(7-3(2))= 2 This means the velocity of the particle is 2 m/s when t=...
April 18, 2011

accounting
(TCO 8) Partial balance sheets for ABC Company and additional information are provided below. ABC Company, Partial Balance Sheets, As of December 31 2009 2008 Equipment $100,000 $75,000 Accumulated depreciation (25,000) (20,000) Common stock, $5 par 180,000 100,000 Paid in ...
April 18, 2011

Calculus
Bosnian, Thanks for your help. I just want to make sure I understand. The local min and max are the same f(2/sqrt3) = 1.92 Are there any absolute maximum or minimum? Thanks again.
April 17, 2011

Calculus
Find any absolute maximum and minimum and local maximum and minimum for the function f(x)=x^3-4x+5 on the interval [0,5). Make sure to prove that these points are max/min values. THis is what I did. f'(x)=3x^2-4=0 x= +/- 2/sqrt3 -2/sqrt3 is outside of interval so just use ...
April 17, 2011

Calculus
Use Newton's Method to approximate the root of the function f(x)=e^x-5x when the intial point chosene is x1=1.5. Do two iterations. This is what I did, but not working. f'(x)=e^x-5 x2=1.5 - (e^1.5-(5(1.5))/e^1.5 -(5)) =1.5-(4.4817-7.5/4.4817-5)=1.5-5.8234= -4.3234 x3=-...
April 17, 2011

Calculus
let f(x)=x^3(e^-x) Answer using calculus, use graphing calculator only to check work. a) Find the local and global extrema of f. b) Find the intervals where f is increasing/decreasing. c) Find the inflection points of f. d) Find the intervals where f is concave up/down. e) ...
April 17, 2011

calculus
The length of a rectangle is decreasing at the rate of 2 cm/sec, while the width w is increasing at the rate of 3 cm/sec. At what rate are the lengths of the diagonals changing at the instant that l=15 cm and w= 8 cm? Are the diagonals increasing or decreasing in length at ...
April 16, 2011

math
i am a relflex angle. all the digits in my angle measure are even. all of my digits are different. all three of my digits are factors of 8. my tens digit is greater than my one digit. what is my measure?
April 4, 2011

chemistry
24. Hydrogen peroxide can decompose to water and oxygen according to: 2H2O2 (l) + -----------> 2H2O (l) + O2 (g) ^ H = -196 kJ What is the enthalpy change accompanying the reaction of 5.00 g H2O2 (l) according to the above mentioned reaction ?
March 23, 2011

chem
24. Hydrogen peroxide can decompose to water and oxygen according to: 2H2O2 (l) + -----------> 2H2O(l)+ O2 (g) ^ H = -196 kJ What is the enthalpy change accompanying the reaction of 5.00 g H2O2 (l) according to the above mentioned reaction ?
March 23, 2011

Calculus
Sorry I don't understand how to get the second derivative, I gsolved the first derivative already
March 20, 2011

Calculus
I need help with finding first and second derivative--simplify your answer. Y=xtan(x) I solved first derivative xsec^2(x) + tan(x) I don't understand how to get the first...can someone show me the steps with explanation?
March 20, 2011

calculus
Did I do this problem right? Find the first and second derative-simplify your answer. y=xtanx y'= (x)(sec^2 x)+(tanx)(1) y'= xsec^2 x + tanx y"= (x)(2secx)(secxtanx)+sec^2 x + sec^2 x y"=2xsec^2 x tanx + 2 sec^2 x
March 18, 2011

calculus
I plug in the numbers into the formula that I used, but I don't get the same answer. Here's what I did, maybe you can tell me what I did wrong. (likely a dumb algebra mistake) f"(x) = lim-->0 f'(x+h)-f'(x)/h =(1/4(x+h)+1)^2 - (1/4x+1)^2/h =(1/16x^2+32xh...
March 16, 2011

calculus
To solve the first step I used the equation f'(x)=lim h-->0 f(x+h)-f(x)/h Can I use this same formula to solve for the second derivative?
March 16, 2011

calculus
Find the first and second derivative - simplify your answer. y=x/4x+1 I solved the first derivative and got 1/(4x+1)^2 Not sure if I did the first derivative right and not sure how to do the second derivative.
March 16, 2011

Maths
A television set is on sale for $780 cash, or 25% deposit and $85 per month for 8 months. How much can be saved by paying cash? How much is charged in interest? Calculate the annual rate of simple interest charged? Working out please:)
March 16, 2011

calculus
I solved this problem, can someone check it to make sure I did it right. There are two parts to this intrepation and estimate of the value. Let C(t) be the total value of the US currency (coins and banknotes) in circulation at time, t. The table gives values of this function ...
March 16, 2011

english
Hi I need help and I appreciated it. am kind of confused and dont what to write. I have to do journal where I see, read, explore, observe about Intersecionality. How can I start writing about this? Thanks
March 14, 2011

Physics
Steel is very stiff, and the Young's modulus for steel is unusually large, 2.0×1011 N/m2. A cube of steel 25 cm on a side supports a load of 85 kg that has the same horizontal cross section as the steel cube. What is the magnitude of the "normal" force that...
February 25, 2011

History
how did the rest of the US feel about war with mexico?
February 18, 2011

Calculus
the first 2 is centered on the division line which has x-2/(sqrt2)-2. I think I placed the brackets right??
February 13, 2011

Calculus
No it only has the sqrt x. The -2 is outside of the sqrt. Just so I know. Had it all been under the square root would I have multiplied the top and the bottom by that sqrt(x-2)?
February 13, 2011

Calculus
The problem is lim --> 2 for g(x) which is 2((x-2/(squareroot x)-2)) I just substituted 2 in for x and 2((2-2)/(squareroot 2)-2) = 0 This doesn't look right. It seems like I'd need to try something different. Can someone tell me if it's right or wrong? And if ...
February 13, 2011

calculus
The problem is lim --> 2 for g(x) which is 2((x-2/(squareroot x)-2)) I just substituted 2 in for x and 2((2-2)/(squareroot 2)-2) = 0 This doesn't look right. It seems like I'd need to try something different. Can someone tell me if it's right or wrong? And if ...
February 13, 2011

calculus
The problem is lim --> 2 for g(x) which is 2((x-2/(squareroot x)-2)) I just substituted 2 in for x and 2((2-2)/(squareroot 2)-2) = 0 This doesn't look right. It seems like I'd need to try something different. Can someone tell me if it's right or wrong? And if ...
February 13, 2011

calculus
The problem is lim --> 2 for g(x) which is 2((x-2/(squareroot x)-2)) I just substituted 2 in for x and 2((2-2)/(squareroot 2)-2) = 0 This doesn't look right. It seems like I'd need to try something different. Can someone tell me if it's right or wrong? And if ...
February 13, 2011

calculus
The problem is lim --> 2 for g(x) which is 2((x-2/(squareroot x)-2)) I just substituted 2 in for x and 2((2-2)/(squareroot 2)-2) = 0 This doesn't look right. It seems like I'd need to try something different. Can someone tell me if it's right or wrong? And if ...
February 13, 2011

calculus
Evaluate the limits without using a calculator. Justify all steps in the solutions. lim x-->0 x^7cos(3/x)
February 13, 2011

Calculus
I figured this out this way but am not sure it's right. f(2) + 4(2) = f(2) + 8. From this we can tell that it exists, but I'm not sure why.
February 13, 2011

Calculus
If a function f(x) is continuous, then what can be said about the value of the following limit lim-->2 [f(x) +4x]
February 13, 2011

calculus
Evaluate the limits without using a calculator. Justify all steps in the solutions. lim x-->0 x^7cos(3/x)
February 12, 2011

calculus
This is what I tried. g(x) = 2((x-2/(squareroot x)-2)) lim --> 2 I just substituted 2 in for x and 2((2-2)/(squareroot 2)-2) = 0 This doesn't look right. It seems like I'd need to try something different.
February 12, 2011

calculus
Use the function given to answer the following questions. g(x)= 2 x-2/(squareroot x)-2 The first 2 is set in the middle of the division line. I think signifying that you solve the x-2/(squareroot x)-2 first then multiple everything by 2. problem to solve is lim-->2 g(x)
February 12, 2011

calculus
Thank you so much for your help!!
February 12, 2011

calculus
Sorry MathMate, The anonymous answer above was mine. Just on a different computer.
February 12, 2011

calculus
I'm really unsure of how to treat the cos(x/3). YOu stated about that the domain for sin, cos is all real numbers. Would it be (-infinity, infinity) for both domain and range?
February 12, 2011

calculus
Find the domain and range of the given functions. 1. h(x)= (squareroot4x+1)+3x-5 2. f(x)=3cos(x/3)-1 3. g(x)= log (x+2) Can someone show me the steps to figure the above problems?
February 12, 2011

calculus
I assume it's a jump since it jumps from one value to another.
February 12, 2011

calculus
Find the discontinuities of the given function. Classify them as a point discontinuity or a jump discontunuity. g(x)= x, x<-3 5x/(x^2-4x), x>= -3
February 12, 2011

english
there is some unknown poet called M.T. Buckley whom seems to be known only to the the English teachers and himself. Wrote a poem called "Birthday" and some others like "Poem of Poems" that didn't make it into the whose who of Poets. Does anyone know ...
February 7, 2011

World History
The Crimean war was fought by
February 7, 2011

World History
even greater than their use of human food, fish oil are a vital source of a. lotion and cream b. fertilizer c. lamp oil d. industrial lubricants
February 7, 2011

Algebra- is my answer right
oh I see what I get. thanks
February 4, 2011

Algebra- is my answer right
The function g is defined by g(x)=3x^2+6. Find g(5y) Algebra - drwls, Friday, February 4, 2011 at 11:07am 3*(5y)^2 + 6 = __? Algebra - Janet, Friday, February 4, 2011 at 3:56pm I get 75y+6
February 4, 2011

Algebra
I get 75y+6
February 4, 2011

Algebra
The function g is defined by g(x)=3x^2+6. Find g(5y)
February 4, 2011

Algebra
Thank you
February 4, 2011

Algebra
Suppose H(x)=(sqrt5x+3). Find two functions f and g such that (fog)(x)= H(x) . f(x)= g(x)= Neither function can be the identity function. (There may be more than one correct answer.)
February 4, 2011

Cochise College
3.88 kl
January 28, 2011

social studies- geography
75% of the active volcanoes are found along the west coast of N. America and east coast of Asia to New Zealand and is often called:
January 17, 2011

social studies-geography
the st. lawrence seaway connects these two bodies of water
January 17, 2011

english
Hi I have some questions and I would really if you answer my questions! I want to be Nurse Practitioner and I am very passion about it. But I have a lot of problems. First English is not my native language, second I am not good at math, third I am kind intimidated by the ...
January 13, 2011

English
My son has to identify stressed syllables with an accent mark and boldface for example forgot,because,daughter.can you help me??
January 11, 2011

4th grade math
what is the directions for algebra functions rule for input and output in adding e. g. rulr= add 2 2/7
January 10, 2011

Statistics
Quality Progress, February 2005, reports on the results achieved by Bank of American in improving customer satisfaction and customer loyalty by listening to the "voice of the customer". A key measure of customer satisfaction is the response on a scale from 1 to 10 to...
January 10, 2011

precalculus
Use the Intermediate Value Theorem and a graphing utility to find intervals of length 1 in which the polynomial is guaranteed to have a zero. Use the root feature of a graphing utility to approximate the zeros of the function. h(x)=x^4-10x^2+2
December 26, 2010

MATH
Permutation For a segment of a radio, a disc jockey can play 7 songs. If there are 13 songs to select from, in how many ways can the program for this segment be arranged? Question # 2 A corporation has ten members on its board of directors. In how many different ways can it ...
December 18, 2010

art
to receive proper training and gain access to commissions, artists during renaissance generally had to join a??
December 17, 2010

soc 120/phi 103
PHI 103 Critical Thinking Quiz 100% 1. A recent study of 100 employees from six departments of a major corporation found 65% to be sleep deprived. The researchers concluded that the majority of corporate employees are sleep deprived. The researcher’s conclusion is suspect...
December 12, 2010

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