Wednesday
October 1, 2014

Posts by sandra


Total # Posts: 899

Atmospheric Science
One of the earliest examples of primitive humans, Australopithecus, lived in Africa between about 4 and 1 million years ago. For what fraction of Earth history have hominids been around?
November 22, 2009

Atmospheric Science
The current magnitude of the greenhouse effect is measured by the difference between the emission from the surface and the emission from the top of the atmosphere, G=¦ÒTs^4 −¦ÒTe^4 ¡Ö 150 W m-2. What would be the required magnitude ...
November 20, 2009

Mathematics for Liberal Arts
You are on a TV show. You have been asked to either play a dice game five times or accept a $50 bill. The dice game works like this: If you roll a 1, 2 or 3, you win $46. If you roll a 4 or 5, you lose $22. If you roll a 6, you lose $85. Should you play the game? Use expected ...
November 20, 2009

11th grade
Where have canadians been involved in peacekeeping missions? where was their first mission?
November 19, 2009

11th grade
Where have canadians been involved in peacekeeping missions? where was their first mission?
November 19, 2009

Chemistry
How can you determine which acid solutions (all at 0.10 M) has the highest concentration of anions?
November 14, 2009

math
Suppose the standard deviation is 13.1. What is the variance?
November 13, 2009

statistics
Use this table to complete the tasks that follow it. Height (in inches) Frequency 50-52 5 53-55 8 56-58 12 59-61 13 62-64 11 Identify the class width. Identify the midpoint of the first class. Identify the class boundaries of the first class. Give the relative frequency for ...
November 13, 2009

Atmospheric Science
Wind is blowing from Lubbock to Abilene at 10 knots. Assuming a uniform and gradual slope between the two cities, what is the implied sign and magnitude of w resulting purely from this orographic influence? Will this wind warm or cool in transit, and by how much?
November 12, 2009

Atmospheric Science
The 15th floor meteorological observatory of the O&M building is 188 ft from the level of the main entrance. Assume that the temperature at the entrance is 25 degrees Celcius, that station pressure is 1000 mb, and the mixing ration is .010 kg/kg. What is the actual (station) ...
November 11, 2009

math
what is the fraction as an equvalent decimal of 20/25
November 5, 2009

english
The number of boys presented is ten
October 20, 2009

Writing skills 1
psychological effect of nuclear weapons
October 13, 2009

Math
The price of a baseball glove is represented by the variable x the statement 'is at most' is represented by the symbol ≤ and then the price is $36.49 So the answer is x ≤ $36.49
October 2, 2009

Physics
A hockey puck is hit on a frozen lake and starts moving with a speed of 12.0 m/s. Five seconds later, its speed is 6.00 m/s. (a) What is its average acceleration? (b) What is the average value of the coefficient of kinetic friction between puck and ice? (c) How far does the ...
September 23, 2009

Quantitative Methods
I am trying to use the Goal Seek Method in Microsoft Excel but i keep getting a message that says "Cell must contain a value". Since the cell does contain a value what could be the error.
September 18, 2009

Math
The number of motor vehicles produced worldwide increased from approximately 57.5 million in 2000 to 60.3 million in 2003. Find the (percentage) change in motor vehicle production from 2000 to 2003.
September 14, 2009

Math
The number of motor vehicles produced worldwide increased from approximately 57.5 million in 2000 to 60.3 million in 2003. Find the percentage change in motor vehicle production from 2000 to 2003.
September 14, 2009

Aged College Student
The dosage of a certain medication is 1/4 ounce for every 50 pounds of body weight. How many ounces of this medication are required for a person who weighs 175 pounds?
September 14, 2009

Math
How to plot y=2x+4
September 14, 2009

Math
How to plot y=2x+4
September 14, 2009

Math
How to graph y= x+4
September 14, 2009

accounting
If you were considering extending credit to someone, what are some of the considerations you would recognize?
August 5, 2009

medical
why insurance companies need so much documentation and the reimbursement system is so complex?
July 29, 2009

Algebra
Diagonal brace. The width of a rectangular gate is 2 meters (m) larger than its height. The diagonal brace measures sqrt6m. Find the width and height.
July 23, 2009

algebra
Reduce the rational expression to lowest terms 1/15abc (5a^3b^5c^2) =3a^2b^4c Is this right. I reduced,and cancelled out exponents.
July 22, 2009

algebra
Reduce each rational expression to lowest terms 3x^2-9x+6/10-5x
July 21, 2009

algebra
Reduce rational expression to lowest terms 3t-6/8-4t
July 21, 2009

algebra
Write each number in standard notation 3.4 x 10^7 = 0.00000034 is this correct
July 21, 2009

pre-algebra
0.6x+ x ¡Ü1.4x-1
July 20, 2009

Statistics
A bank lobby has four video cameras positioned to view the entire lobby. any one of the four is sufficient to monitor the lobby. each camera functions independently and has a reability of 0.90, that is, the probability of functioning is 0.90. a bank robbery takes place. let a ...
July 20, 2009

algebra
A parabola has x-intercepts at 3 and 7, a y-intercept at -21, and (5,4) for its vertex. Write the parabola’s equation
July 19, 2009

algebra
Solve problem. Telephoto lens. find the image distance i for an object that is 2,000,000 mm from a 250-mm telephoto lens. tel formula is 1/f=1/o + 1/i 1/250=1/2,000,000 + 1/i 5i(1/250)=(1/2,000,000 + 1/i)5i 1/50i = 5i/400,000i + 5i/5i 1/10i = 5i/80,000i + 5i/5i I=8,000 Is this...
July 19, 2009

algebra
Fast food. If four out of five doctors prefer fast food, then at a convention of 445 doctors, how many prefer fast food? 4/5=x/445 5x=1780 x=356 please check if completed right
July 18, 2009

algebra
Bear population. To estimate the size Use a proportion to solve of the bear population on the Keweenaw Peninsula, conservationists captured, tagged, and released 50 bears. One year later, a random sample of 100 bears included only 2 tagged bears. What is the conservationist&#...
July 17, 2009

algebra
5x=1780 (4x445) 1780/5 x=356 checking to see if I completed right.
July 17, 2009

algebra
Use a proportion Fast food. If four out of five doctors prefer fast food, then at a convention of 445 doctors, how many prefer fast food?
July 17, 2009

algebra
Find a ratio, and simplify to lowest terms Rise and run. If the rise is 3/2 and the run is 5, then what is the ratio of the rise to the run?
July 17, 2009

algebra
Show a complete solution. Upstream, downstream. Junior’s boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?
July 17, 2009

business
What is the interrelationship among the four financial statements? What methods are used to analyze an organization's financial condition?
July 14, 2009

American History
I just need help with the second question I already did the first one. I understand that some of the criticism are voteing, travel, I need a few more but I don't know what to put.
July 14, 2009

American History
What does American democracy mean to mean to you as an individual? What are some of the criticism of this style of government?
July 14, 2009

algebra
Reduce each rational expression to lowest terms. Assume that the variables represent only numbers for which the denominators are nonzero. 4x^2/2x^9
July 13, 2009

algebra
Simplify each complex fraction. Reduce each answer to lowest terms. ab+b^2/4ab^ 5 _______________ a+b/6a^2b^2
July 13, 2009

algebra
Reduce each rational expression to lowest terms. Assume that the variables represent only numbers for which the denominators are nonzero. a^2-b^2/a-b
July 13, 2009

algebra
5 is numerator/ y-3 is denominator y + 7/(2y-6) +1 y +7 is numerator, 2-y is denominator the whole thing +1
July 13, 2009

algebra
Perform the indicated operation (-2a²)/(3a²) X (20a)/(15a³)
July 13, 2009

algebra
Here are questions to worker question solve the problem. a) Rewrite the formula by factoring the right-hand side completely. b) Use the factored version of the formula to find N(3). c) Use the accompanying graph to estimate the time at which the workers are most efficient. d...
July 13, 2009

algebra
Worker efficiency. In a study of worker efficiency at Wong Laboratories it was found that the number of components assembled per hour by the average worker t hours after starting work could be modeled by the formula N(t)=-3t+23t^2+8t
July 13, 2009

algebra
Build each rational expression into an equivalent rational expression with the indicated denominator (-7yt)/(3x) =(?)/(18xyt)
July 13, 2009

algebra
Perform operation (-2a²)/(3a²) X (2a+2)/(15a³) Sorry this is my first time typing out math problems. Thank you for your help.
July 13, 2009

algebra
perform operatiion -2a²/ * 2a+2/ 3a² 15a³
July 13, 2009

algebra
Perform operation 3/a^2 x 2a+2/6
July 13, 2009

algebra
Perform operation 3/ * 2a+2/ a²+a 6
July 13, 2009

algebra
Reduce to simplest terms,rational expression -2x-8 ______ x^2+2x-8
July 13, 2009

Algebra
Build each rational expression into an equivalent rational expression with the indicated denominator. -7yt= ? ____ _____ 3x 18xyt
July 10, 2009

algebra
Which numbers cannot be used in place of the variable in each rational expression? 2y+1 ____ y^2-y-6
July 10, 2009

algebra
Decreasing cube. Each of the three dimensions of a cube with sides of length s centimeters is decreased by a whole number of centimeters. The new volume in cubic centimeters is given by V(s) = s3 - 13s2 + 54s -72. a) Find V(10). b) If the new width is s - 6 centimeters, then ...
July 10, 2009

math
Yeah I already figured it out thank you. I was wondering how you did it solved the problem I was getting fusterated b/c I tried it so many ways and I just wouldn't come up with an answer, I was way off the mult. choice. Once again thanks.
July 9, 2009

math
So what you did was mult. 230,000 by 1.06 right which I got 368000. But from there what do I do did you mult. 368000 by 21? I'm lost in that step right there.
July 9, 2009

math
Well you see that is what I did and but still don't come up with the answer these are my answer options. A)$427,867.75 B)$737,641.16 C)$828,813.61 D)$781,899.63 I even did this since there are 12mths in a year I mult. 12 by 21 which I got 252. So what is the answer though????
July 9, 2009

math
I can not solve this problem it's kind of hard for me can anyone please help me out. Thanks 1.If inflation is 6% a year compounded annually, what will it cost in 21 years to buy a house currently valued at $230,000? Round to the nearest cent.
July 9, 2009

comprehensive Gramer
My new coworker, a Muslim,is actually quite nice
July 6, 2009

college
DEFINE WHAT IS MEANT BY THE TERM''HUMANITIES''AND EXPLAIN WHAT DISTINGUISHED THE HUMANITIES FROM OTHER MODES OF HUMAN INQUIRY AND EXPRESSION. THEN LIST A CURRENT EX. OF EACH OF THE EXPRESSIONS OF THE HUMANITIES LISTED BELOW AND TELL WHY EACH EX. YOU GIVE ...
June 2, 2009

math
sandra bought 2 1/4pounds of lumbaar at 4.00 a lb. if a 7 percent tax was added, how much did she pay i know answer is $9.63 how did they get the answer
May 12, 2009

5th grade Math
i know right. this is hard and im in the 9th grade
May 4, 2009

Clark Atlanta
Write a 200- to 300-word explanation of the reasons the following types of companies would need a financial forecast: brand new company, family owned company, and a long-standing corporation.
April 20, 2009

chem
why is the answer 9 can you please explain
April 9, 2009

chem
What is the total number of orbitals possible for n = 3
April 9, 2009

chemistry
What is the wavelength of a ball that is 25.0 g traveling at 90.0 miles per hour (40.2 m/s)? I tried solving it by using c = wavelenth* frequeny but i get the wron answer
April 9, 2009

Calculus
it'sh(t)= Acos2 pi ft
April 5, 2009

Calculus
How do I find the frequency of this oscilliating spring. A= 10cm displacement t= 1s h(t)= Acos2ðft
April 5, 2009

Chemistry
I forgot to mention that forward arrow is suppose to be an equilibrium arrow forward/reverse
March 27, 2009

Chemistry
Calculate [Fe^2]+ when the cell reaction reaches equilibrium? A voltaic cell is constructed based on the following reaction and initial concentrations: Fe^2+,( 0.0055 M ) + Ag+,( 2.5 M ) ----> Fe^3+,( 0.0055 M ) + Ag(s) Calculate [Fe^2]+ when the cell reaction reaches ...
March 27, 2009

Psychology
"How are a cat and a dog alike? An answer to this question requires:
March 27, 2009

CHEM HELP
Nicotinic acid (niacin) is a monoprotic acid with the formula HC6H4NO2. A solution that is 0.012M in nicotinic acid has a pH of 3.39 at 25*C. What is the acid-ionization constant, Ka and pKa for this acid at 25*C? is the ionization equation: HC6H4NO2+ H20(l) <>C6H4NO^-(...
March 24, 2009

Calculas
how to find the x intercepts for f(x) = 3x^3+7x^2+3x+1 please show your steps
March 23, 2009

calculas
how to find the x intercepts for f(x) = 3x^3+7x^2+3x+1 please show your steps
March 23, 2009

calculas
how to find the x intercepts for f(x) = 3x^3+7x^2+3x+1
March 23, 2009

math
how to factor 3x^3+7x^2+3x+1
March 23, 2009

math 116
-x/9=1/16 This is suppose to be solved using the multiplication principle. If possible please show me not just the answer but how you came up with it so I understand how to do these problems. Thank you
March 22, 2009

Calculus
How do you find the critical numbers and the end points of this function: f(x)=2x^3-3x^2-12x+5 i calculated the critical numbers as x=-1 and x=2 is this right?!?!
March 21, 2009

statistics
A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. How large a sample is needed in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 5%? A previous study indicates that the proportion ...
March 20, 2009

2nd grade
Thank You!
March 18, 2009

2nd grade
How are a retangle and a pyramid the same? How are they different
March 18, 2009

Financial Management
A small company was founded by 2 electronic engineers, Tom and Jessica, 15 years ago. The company manufactures integrated circuits to capitalize on complex mixed-signal design technology and has recently entered the market for frequency timing generators, or silicon timing ...
March 9, 2009

Financial Management
A small company was founded by 2 electronic engineers, Tom and Jessica, 15 years ago. The company manufactures integrated circuits to capitalize on complex mixed-signal design technology and has recently entered the market for frequency timing generators, or silicon timing ...
March 6, 2009

7th grade science
wat? huh? waa?
March 6, 2009

Chemistry!!!
Use Le' Chatelier's Principle. a solution at equilibrium: BaCrO4(s)<> Ba^2+(aq)+ Cr)4^-(aq)recall: 2CrO4^2-(aq)+ 2H^+(aq)<> Cr2O7^2-(aq) +H20 2CrO4^2- yellow Cr2O7^2- orange Make predictions about colour changes or changes in the number of states a) To a ...
March 5, 2009

College Algebra
A rectangular swimming pool is 8 meters long and 12 meters wide. A tile boarder of uniform width is to be built around the pool usinjg 120 square meters of tile. How wide should the boarder be? Round anser to the nearest hundredth.
February 25, 2009

CRIMINAL LAW - N word
what are 3 arguments you can use for and against criminalizing the use fo the N word?
February 23, 2009

CRIMINAL LAW - MARIJUANA
what are 3 arguments you can use for and against the legalization of Marijuana?
February 23, 2009

CRIMINAL LAW - SPANKING KIDS
what are 3 arguments you can use for and against the criminalization of parents hitting/spanking their children for any reason?
February 23, 2009

CRIMINAL LAW- MUSIC
what are 3 arguments you can use for and against the criminalization of music that glamorizes drugs, crime andthe degradation of women?
February 23, 2009

criminal law - talking on cell phone
what are 3 arguments you can use for and against the law restricting people from talking on the cell phone while driving... even with a headset?
February 23, 2009

criminal law- calorie content
what are 3 arguments you can use for and against the law requiring restaurants to display the calorie content in food?
February 23, 2009

criminal law
Thank you Ms. Sue
February 23, 2009

criminal law
what are 3 arguments you can use for and against the criminalization of sex with someone under 17 that looks, acts, talks and even says that they are older?
February 23, 2009

Physics
A string passes over a frictionless, massless pulley attached to the ceiling. A mass m1=15.0 kg hangs from one end of this string, and a second massless, frictionless pulley hangs from the other end of the string. A second string passes over the second pulley and a mass m2=4.0...
February 21, 2009

math
i do not understand what is 2,340 divisible by 90
February 18, 2009

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