Wednesday
August 27, 2014

Posts by sally


Total # Posts: 886

physics
Two boat landings are 3.0 km apart on the same bank of a stream that flows at 1.6 km/h. A motorboat makes the round trip between the two landings in 50 minutes. What is the speed of the boat relative to the water? How do I factor in the fact that velocity is subtracted by 1.6 ...
August 10, 2014

math
for partial fractions dont you do A/(v+2) + B/ (v-1) = (v+2)(v-1)? how do you go from there? can you show what you did step by step?
July 12, 2014

math
how do you go from dv/(v+2)(v-1) to -(1/3)/(v+2) + (1/3)/(v-1) dv?
July 12, 2014

science
and how does it go from there to this In the near-Earth orbit the rate of change of momentum is (v/R)p = (v/R)mv toward the center of the Earth, and this must equal the gravitational force GMm/R2, so mv2/R = GMm/R2, and mv2 = GMm/R. Therefore in this orbit K+U = (1/2)mv2 - GMm...
July 11, 2014

science
how is this equation derived from the momentum principle? In the near-Earth orbit the rate of change of momentum is (v/R)p = (v/R)mv
July 11, 2014

physics
if a bird is sitting on a seat in a plane that is travelling 300 km/h[E], if the bird jumps for a couple seconds will he: land on the front of the bus, back of the bus, one seat ahead, one seat behind, on the same seat he was standing on
June 20, 2014

physics
In space, an object has only ONE force acting on it. Can the object have constant acceleration and/or a velocity of 0. Explain.
June 20, 2014

physics
In a vacuum, a stone and feather fall at the same time. Can you make the assumption that the acceleration of gravity acting on both objects is the same? Explain.
June 20, 2014

Chemistry
Yesterday we combined Hydrochloric Acid HCl with Sodium Hydroxide NaOH in a violent reaction that resulted in water H2O and common table salt NaCl. How many grams of hydrochloric acid should we use so we have exactly enough to react with 40g of sodium hydroxide? You'll ...
June 19, 2014

Chemistry
How many grams of hydrochloric acid should we use so we have exactly enough to react with 40g of sodium hydroxide? You'll need to write a chemical reaction, balance it, and then perform your calculation.
June 19, 2014

English
Crazy Teens: Are They Taking Over the World?
June 11, 2014

Math
Alex's distance form home is represented by the equation D= -0.5t +300 D represents his distance from home and t represents time in minutes How long will it take Alex to reach a distance of 182 km from home
June 9, 2014

Math
4 Do a tree diagram
June 9, 2014

Science ecosystems
Paper Glass Aluminum Wooden ruler Sand Steak Pork chops Salad Bread Hair Cotton fabric Wool Cheddar cheese Can you tell why ? It is urgent ! Are they. Biotic or abiotic
June 4, 2014

Science ecosystems
😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭
June 4, 2014

Science ecosystems
Okay I did it and I do not CHEAT!!!!!!!😡😡😡😡 that is not something I like
June 4, 2014

Science ecosystems
Hello can someone answer my question
June 4, 2014

Science ecosystems
According to biotic and abiotic
June 4, 2014

Science ecosystems
How do I sort these properly
June 4, 2014

Science ecosystems
Paper Glass Aluminum Wooden ruler Sand Steak Pork chops Salad Bread Hair Cotton fabric Wool Cheddar cheese Can you tell why ? It is urgent !
June 4, 2014

Math
A frame around a photo is 5 cm wide. The photograph is 20 cm long and 10 cm wide. What percentage of the entire area is the frame.
June 4, 2014

physics
A car is rounding a circular curve of radius r on a banked turn. As the drawing indicates, there are two forces acting on the car, its weight mg and the normal force FN exerted on it by the road. Which force, or force component, provides the centripetal force that keeps the ...
June 1, 2014

Algebra 2
If a light has a diameter of 36 inches at its opening, what is the depth of the light if a lightbulb is 6 inches from the vertex.
May 22, 2014

Algebra 2
Use the distance formula to find the equation of a parabola. Focus: (6,0) and directrix X = -3 I know the distance formula is: √(x-x1)^2+(y-y1)^2 = √(x-x2)^2+(y-y2)^2 I know I need to sub (6,0) for x1,y1 and (-3,y) for x2,y2 √(x-6)^2+(y-0)^2 = √(x-(-3...
May 22, 2014

Help Mrs.Sue LA
sorry my brother changed my name err i dont like little brothers.
May 21, 2014

Help Mrs.Sue LA
Courage to Speak “Any volunteers?” Ms. Chavez scanned the class. Ming slouched farther down in her seat. “Come on now, you’ll all have to interview someone sometime this year. No one wants to go first? Okay, I’ll just have to choose someone.” I am...
May 21, 2014

Math
19, 19, 14, 14, 16, 19, 19, 16, 16, 15, 17, 16, 17, 16, 15, 14, 15, 15, 17, 14, 16, 15 2. Find the mean for the data. If necessary, round to the nearest tenth. 17.5 16.5 17.1 16.1 *** 3. Find the median for the data. 17 16 15 14 4. Find the mode for the data. 14 15 16 17
May 20, 2014

Math -___-
The table below shows the percentage of households that own a microwave in different countries. Constuct a stem-and-leaf plot of the data. Use the ‘|’ key (Shift + \ on most keyboards, just beside the backspace key) to create the line between the stems and the leaves...
May 17, 2014

MATH PLEASE HELP MRS.SUE!
What are the next three terms in the sequence? –1, 9, 19, 29, … (1 point) 38, 37, 32 40, 51, 62 39, 49, 59 38, 47, 56 2. Geoff planted dahlias in his garden. Dahlias have bulbs that divide and reproduce underground. In the first year, Geoff’s garden produced 6 ...
May 7, 2014

math
Paula is an office manager for ABC Advertising. She has been tasked with finding a copy machine that falls within a budget of $750 per month. She finds a company that will lease the machine for $275 a month. Each copy costs 4¢ and a ream of 500 sheets of paper costs $5.00...
April 25, 2014

math
A movie theater ticket booth opens at 10 am. There are four tellers who divide the customers evenly. The tellers have served 16 customers so far this morning. which expression represents the unknown number of customers each teller will serve? Let c represent the additional ...
April 22, 2014

Physics 1
What torque is needed to accelerate a 70Kg disk with a 20 cm radius from rest to 10 rad/s?
April 17, 2014

Physics 1
What is the rotational kinetic energy of the Earth in its orbit around the sun?
April 17, 2014

Math
The GoodMentalHealth Insurance Company has determined the number of new clients a psychologist gets per month and their respective probabilities, as shown in the table below: Number of New Clients Probability 0 0.05 1 0.10 2 0.15 3 0.35 4 0.20 5 0.10 6 0.05 The probability of ...
April 17, 2014

statistics
Professor Smith gave a final exam in her history class. The scores on the final exam are normally distributed with a mean of 75 and a standard deviation of 6. If Professor Smith wishes to give A’s to the top 4%, what would be the cutoff score be for A’s? a. 90.0 b. ...
April 14, 2014

statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
April 14, 2014

statistics
Ashley and Sanjay are donating blood at a local hospital. As a standard practice, the blood is screened for anemia (low levels of red blood cells), and the results are given to each donor as a z score, ranging from negative scores (low amounts of red blood cells, anemic) to ...
April 14, 2014

albebra
In mathematics, we commonly use the following formula for perimeter of a rectangle: P = 2L + 2W so 54=2(6)+2(x) 54=12+2(21) W=21cm Usually the length is longer than the width. Double check your answer and problem
April 14, 2014

statistics
Leslie took two midterm exams and earned the following scores: 82 on the chemistry exam (class distribution: μ = 75, σ = 6.25) and 63 on the physics exam (class distribution: μ = 59, σ = 3.57). Rounding to two decimal points, on which exam should Leslie get...
April 14, 2014

science
The Hertzsprung-Russell Diagram is a graphical tool that astronomers use to classify stars according to their luminosity, spectral type, color, temperature and evolutionary stage. So the answer is D
April 14, 2014

math
Gopal spent three fifths of his money in the first week and one third of the remainder in the secondweek.He spent $110 altogether.How much money did he have left?
April 11, 2014

Science
Explain how gravitational, electrical, and magnetic forces act on a maglev train?
April 10, 2014

math
you are correct :)
April 9, 2014

AP CHEM
is there some rule on weak and strong electrolytes and the amount of concentration requiered for each? for example are weak electrolytes supposed to have low concentrations and vice versa for strong electrolytes? if so cna you please explain why as well? Thank you so much! :)
April 2, 2014

Science
Describe how the structure of DNA is correlated with its role as the molecular basis of inheritance in Biology.
March 28, 2014

Math
A stone was thrown from the top of a cliff. The height, H meters, of the stone above sea level t seconds after it was released is given by H=-5t+20t+60. a)How high is the cliff? What makes you say this? b) How high is the stone after two seconds? c) What is the maximum height...
March 5, 2014

math
The answer in the book is 100. I can't come up with that solution.
February 26, 2014

math
200 people attended a party. Ninety-nine percent of the people were FSU fans. After some people left the party, 98% of the people left were FSU fans. How many people left the party?
February 26, 2014

Physics
I don't understand the negative. Would it be wrong if I put the negative answer if they're asking how long it takes the sand bag to hit the ground?
February 9, 2014

Physics
A sand bag is dropped out of a balloon traveling upward at speed of 2.3m/s. A kiddo drops a bag at the instant the balloon is 34m above the ground. How long does it take the sand bag to hit the ground? I got -2.41s why?
February 9, 2014

Physics
Landing with a speed of 90 m/s In the x direction a jet come to rest at 1 km. assuming the jet slows down with constant acceleration find the magnitude of it's acceleration. Is there anyway someone could break this down step by step??
February 7, 2014

math
Find the centre of the circle that passes through the points p(-9,5), q(1,5), and r(-2,-2)
January 3, 2014

Plz help :(
1. 2:3 6. 0.35 10. Can u plz help me with this one? Here are the choices for #4 4/27 2/13 13/2 52/8
November 25, 2013

Plz help :(
My answers: 1. 3:4 2. x = 2 3. 9 4.? 5. 5.6 6. 0.35 9.? 10. my guess, 62?
November 25, 2013

Plz help :(
Thanks....
November 25, 2013

Plz help :(
1. Write the ratio in the simplest form. 16:24 (1 point) 1:2 4:3 3:4 2:3 2. Solve the following proportion. x over three equals six over nine (1 point) 18 27 2 24 3. A recipe calls for 3 cups of flour to make 3 dozen cookies. Use the proportion to calculate how much flour is ...
November 25, 2013

Math help plz check my answers!
1. Write the ratio in the simplest form. 50:10 25:5 10:2 5:1 1:5 2. Solve the following proportion. r/5= 9/21 r = 9 r = 2.14 r = 11.66 r = 37.8 3. A recipe calls for 3 cups of flour to make 3 dozen cookies. Use the proportion to calculate how much flour is needed to make 9 ...
November 23, 2013

Math
Expand and simplify For + 5(a+8)= And for - 7(3d-6)
November 18, 2013

accounting
Exercise 5-3 Analyzing and recording merchandise transactions-both buyer and seller LO P1, P2 Santa Fe Company purchased merchandise for resale from Mesa Company with an invoice price of $16,000 and credit terms of 3/10, n/60. The merchandise had cost Mesa $10,912. Santa Fe ...
November 17, 2013

Calculus
For R"(x) = -15[(x-1)(e^-x)-(e^-x)] with 0 < x < 7 What interval is the graph concave and and concave down? I know concave up is (0,2). Is that right? Does concave down exist?
November 11, 2013

Economics
Is it true that the underlying trend of growth in the economy is determined by the growth in the number of workers, the growth in the savings and investment rate, and the growth in productivity ?
November 9, 2013

math
Find the equation of the line that has the given slope and passes through the given point: m = -3, (6,6)
October 29, 2013

basic english
Complete the following sentence with a word or words that show a logical relationship. Joshua took a nap _____ sorting the mail.
September 23, 2013

Economics
Could you please elaborate on Cap and Trade? How could we use it for companies to limit their air pollutants?
September 20, 2013

World History
Not sure need help
September 11, 2013

Computer Science
The array represents a map with coins, and the integers represent a row and column location of a coin gatherer. The gatherer is greedy and lazy when deciding to which adjacent location (either up, down, left, right) to move next. It’s greedy because it moves to the ...
September 8, 2013

psychology
how do various behaviors of social dominance and coutship display affect the evolutionary process
September 4, 2013

math
Who discovered the Worlds Smallest Glacier?
August 20, 2013

algebra 2
Who discovered the Worlds Smallest Glacier?
August 20, 2013

Animal Physiology HELP!!!!!!!!!!
Please help me!!! What are the answers to these Animal Physiology questions? Urgent..... A decrease in the partial pressure of carbon dioxide in the lungs is referred to as a) Respiratory acidosis b) Hypercarbonia c) Hyperoxia d) Hypercapnia ...
July 31, 2013

science
10% of the atmosphere is located above the altitude where the pressure is a. 100 b. 900
July 8, 2013

Math
tan-1(tan(3pi/5))
July 7, 2013

English 10
Add punctuation to the following excerpt. Irving continues in those days, the heart of lover could not contain more than one lady at a time a modern gallant has often room enough to accommodate half a dozen either the hearts of the gentleman have grown larger, or the persons ...
June 27, 2013

Introduction to human services
What have been the most significant changes in human services over the past 50 years
June 18, 2013

Art
yea i have bats, oh ok thnx
June 16, 2013

Art
i have to make a cave for art but i need ideas what to put in it. There's four rooms in the cave, i have bones,skeleton,stalagmites,stalactites,webs what eles?
June 16, 2013

Finance
You are considering buying 100 shares of TEXAS INC common stock. The common stock is expected to pay a dividend of $2.50 a year from today; the growth rate of the dividends is 8% for two years, then level off to a constant rate of 5% per year. The correlation between TEXAS Inc...
June 14, 2013

Spanish
Tu amigo insiste en preguntarte de quiénes son las cosas. Tú le contestas de forma muy enfática. 1.¿De quién es este sombrero? / tú 2.¿De quiénes son estos cinturones? / Tomás y Ricardo 3.¿De quiénes ...
June 2, 2013

chem ! help!
.A balloon is filled with 14 L of gas at 302 K. What is its temperature in Kelvin when the volume expands to 20 L? Round to the nearest whole number. Don't forget the units. my teacher explained it but im still lost please help
May 23, 2013

algebra
please help Solve for h in U= mgh. Please show steps.
May 4, 2013

algebra
find the LCM of 15ef and 12e^4 (12e to the power of 4) Please show the steps. I do not understand how to do this.
May 4, 2013

Chemistry
Oh and the Ksp values for AgCl and PbCl2 is 1.8x10^-10 and 1.7x10^-5, respectively.
April 21, 2013

Chemistry
A solution contains 0.022 M Ag and 0.033 M Pb2 . If you add Cl–, AgCl and PbCl2 will begin to precipitate. What is the concentration of Cl– required, in molarity, when A. AgCl precipitation begins? B. AgCl precipitation is 99.99% complete? C. PbCl2 precipitation ...
April 21, 2013

math
find the verticle, horizontal, and oblique asymptotes, if any, for the given rational function: g(x)=x^4-81/3x^2-9x I feel like such a dork becaue i have no clue how to do this, can someone please help me????
April 15, 2013

calculus
3). The shaded region is bounded by the y-axis and the graphs of y=1+√x, y=2. Find the volume of the solid obtained by rotating this region around the x-axis. Answer choices: 7/6pi, 4/3pi, 11/6pi, 5/3pi, 13/6pi, 5/6pi 4). Find the area of the region bounded by y=x^2-6x+7...
April 14, 2013

calculus
5). Find the volume of the solid of revolution generated by rotating the graph of y=8 lnx about the y-axis between y=0 and y=16 Answer choices: 238.39pi, 246.39pi, 230.39pi, 214.39pi, 222.39pi 7). Find the area of the region bounded by y=√x-2, y=9, y=0, x=0
April 14, 2013

calculus
10). Find the area of the region bounded by the graph of f(x)=4lnx/x, y=0, x=5.8 11). Find the area of the region bounded by x=y^2-1y, x=0
April 14, 2013

calculus
8). Part 1 of 2: In the solid the base is a circle x^2+y^2=16 and the cross-section perpendicular to the y-axis is a square. Set up a definite integral expressing the volume of the solid. Answer choices: integral from -4 to 4 of 4(16-y^2)dy, integral from -4 to 4 of (16+y^2)dy...
April 14, 2013

Math
Null factor law and factoriising: 2x^2+7x=0 X(2x+7)=0 X=0 or 2x+7=0. ( the answer in the book was x=-7/2, how? And. X^2-4=2x-4 Is it x^2-4-2x+4=o ??? If so!' how do I continue?
April 14, 2013

pre calculus
Given the following polynomial; f(x)=(x-2)^3 Find: a. the zeros and the multiplicity of each b. where the graph crosses or touches the x-axis c. number of turning points d. end behavior I have no clue what I am doing. pleeeaaase help!!!
April 10, 2013

ecology
Ten breeding pairs of rabbits are introduced onto an island having no natural predators and a good supply of water and food. What will most likely happen to the rabbit population? 1. It will decrease and then increase indefi- nitely. 2. It will die out due to an increase...
April 9, 2013

math
4xsquared=32
April 4, 2013

math
the length of a photograph is 1 cm less than twice the width. the area is 28 cm squared. find the dimensions of the photograph.
April 2, 2013

math
Students are baking muffins to sell to raise money. They bake muffins in trays of 24 muffins each. They want to divide the muffins on each tray into equal packets. Which packet size would result in muffins from each tray being left over? A.3 muffins per packet B.6 muffins per ...
March 27, 2013

English/writing
what is a catchy topic for my essay based on this thesis statement? In Nathaniel Hawthorne's, The Scarlet Letter, it suggests that one must find their own internal strength and strive for individual redemption by applying the beliefs of transcendentalism and individualism ...
March 27, 2013

Chemistry Solubility help!!!!!!!!!
INFORMATION: [HCl] = 0.1388 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: Flask A: Distilled Water (7.4 mL of HCl needed to titrate) Flask B: 0.05 NaOH (12.1 mL of HCl needed to titrate) Flask C: 0.025 NaOH (10.8 mL of HCl needed to titrate) Flask D: 0.0125 ...
March 26, 2013

Physics
A dockworker loading crates on a ship finds that a 22-kg crate, initially at rest on a horizontal surface, requires a 76-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 59 N is required to keep it moving with a constant ...
March 25, 2013

algebra 2nd try
I need to simplify this 2/∛49 . I figured it out to be (2∛((49)^2))/49 but the system I added my answer to says this is incorrect. Please help me! Thanks anyone.
March 23, 2013

algebra
Simplify 2/root 3(49) I solved it as 2 root 3(49) over 49. the system that I entered it in says this is incorrect. Help I need to understand how to do this problem with steps. I am so confused. Thanks
March 22, 2013

Chemistry
I have done this and got 31.68 for the molar mass. I converted 720.mmHg to .947 atm. T is 304 degrees K. I came up with n=5.47*10^-3. This gives me a molar mass of 31.63. I am being told this is incorrect. I am not sure where I am going wrong. Can you help me? L=.144
March 18, 2013

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