# Posts by Sarah

Total # Posts: 5,982

Chemistry
Write a net ionic equation for the reaction that occurs when excess hydrobromic acid (aq) and sodium sulfide are combined.

Math
Would I need to add || absolute value around any variables?

Math
I'm having trouble understanding when I am supposed to add absolute values when simplifying radicals. (It's cube root not square root) XER and YER because it's a cube root and you can take cube root of negatives and positives. ?-108x^7y^9 = ?-27•4•x^6&#...

Math
Evaluate : -5|1-3|+4|3-1| -5|-2|+4|2| -5 (2)+4 (2) -10+8 -2 Is this right?

Math
Factor: 50 (2x-5)^2 -162 (3y-2)^2 I'm not even sure how to do this. I've tried it for so long and I've been trying multiple ways. I don't know how to factor these. May I get a step to step explanation or work please?

science
c6h12o6(aq)+6o2(g)->6co2(g)+6h2o(l) ?h=-2820kj c2h5oh(aq)+3o2(g)->2co2(g)+3h2o(l) ?h=-1380kj hitunglah reaksi c6h12o6(aq)->2c2h5oh(aq)+2co2(g)

Math
Oh never mind. I realized my mistake. It was 4 1/4 in the question but I accidentally changed it to 1 1/4. Thank you so much for the help though

Math
I've tried that. And I either get |-5.75| or I get 5.75 which are the same thing

Math
Use absolute value to determine the distance between the two numbers. -3.5 and 4 1/4 |-3.5- 1 1/4| |-3.5- 9/4| |-3.5/1 - 9/4| |-14/4 - 9/4| |-23/4| 23/4 5.75 I got 5.75 as my answer. But why does my answer key show 7.75 units? I'm not sure what I did wrong. I've double...

Social studies
2: How might the Iroquois have been helpful in assisting the British troops in the surprise attack? a- the Iroquois likely had better knowledge of the area and could lead the British troops through the woods b- the Iroquois likely had better knowledge of the habits of the ...

math
A flagpole at a right angle to the horizontal is located on a slope that makes an angle of 18° with the horizontal. The flagpole casts a 14-meter shadow up the slope when the angle of elevation from the tip of the shadow to the sun is 21°. (b) Write an equation ...

chemistry
What is the change in ph after addition of 10.0 ml of 1.0 m sodium hydroxide to 90.0 ml of a 1.0 m nh3/1.0 m nh4+ buffer? [kb for ammonia is 1.8 x 10-5]?

chemistry
Methane (CH4) is the main component of natural gas. It is burned for fuel in a combustion reaction. The unbalanced combustion reaction for methane is shown below. CH4 + O2 CO2 + H2O + heat When the reaction is balanced, how many carbon dioxide molecules are produced for every ...

chemistry
What is the pH of a weak acid solution that has an [H*] of 2.1×10^6 M?

Math_ Geometry
The sum of the interior angles of a regular polygon equals 1260 degrees. How many sides does a polygon have?

Physics
A person runs off a cliff. The person runs with a speed of 10 m/s and is moving to the right as he leaves the cliff. The cliff is 13 meters above a pool of water. a) Determine the acceleration of the person after leaving the cliff (x and y components). b) Determine the time it...

college history
What were the events in Germany, Russia, and Ireland after World War I? My history textbook does not discuss the question at all. Please help. I need to know the answers in preparation for the test I have tomorrow. Thank you.

Econ Online
market competition pushed a price down toward its market-clearing level. Which of the following BEST describes they type of competition that would cause lower prices 1) Competition between buyers and sellers 2) Competition among sellers 3) Competition among buyers 4) ...

Econ
explain the economic effects of a price floor at \$8. Be sure to reference quantity, shortage or surplus, etc.

Econ Online
Popcorn and coke are complements because the are often enjoyed together. When the price of coke rises, what happens to the supply, demand, quantity supplied, quantity demanded, and the price in the market for popcorn?

Econ Online
Analyze what happens to the market for cheeseburgers if the price of the cheese rises (cheese being the part of the cost of a cheesburger). Be specific and explain (or is not affected) for each of the following: 1. supply curve 2. the demand curve 3. the equilibrium quantity 4...

Physics
Two blocks of identical mass are placed in water. One is made of aluminum, the other of wood. The wood block is noted and therefore floating. Upon which is the buoyant force greater? 1) on the aluminum block, 2) on the wood block or 3) they both experience the same buoyant ...

Physics
Two blocks of identical mass are placed in water. One is made of aluminum, the other of wood. The wood block is noted and therefore floating. Upon which is the buoyant force greater? 1) on the aluminum block, 2) on the wood block or 3) they both experience the same buoyant ...

physics
A mass is attached to a horizontal spring and compresses the string by 10 cm (position A). when it is released, it bounces back and stretches the spring by 10 cm (position B). Compare the potential energies at position A and B. The choices are 1). A>B, 2) A=B 3)A<B or 4...

algebra
once I find the time, which would be in a xx.xx format, I would calculate the distance at d=rt , correct?

algebra
During a hurricane evacuation from the east coast of Georgia, a family traveled 450 miles west. For the first part of the trip, they averaged 25 mph less than the second part, where their average speed was 62mph. If the total time of travel was 9 hours, how many miles did they...

Social
Oh okay thank you Ms. Sue and Reed So to clarify: My 2nd argument can be: Transnational Corporations and how it causes pollution which can be harmful for people that work in factories. And industrialization as well and manufacturing of products. My 3rd argumenet: The ...

Social
Isn't that connected with my second argument though? Or if what u told me can be my 3rd argument how can I change the 2nd so they aren't as similar?

Social
My essay needs to be about impacts of globalization on human rights. My thesis statement is: there are negative impacts of globalization on human rights to a great extent. And for it, I mean globalization

Social
I need help. I have to do an essay for globalization and human rights. I have 2 arguments: 1) it represents a challenge to cultural and local languages. So I'm going to be talking about Al-Jazeera and how the languages are slowly being disappeared. I'm also going to ...

math
Thomas is thinking of a number, if he doubles his number and subtracts 27, he gets 407. Whats his number?

Science physics
Ohhh. That's what I missed. Okay thanks for explaining step by step. It helped a lot

Science physics
Ohhh. That's what I missed. Okay thanks for explaining step by step. It helped a lot

Science physics
Ohhh. That's what I missed. Okay thanks for explaining step by step. It helped a lot

Science physics
The question is asking for work though. And the answer says it's 88J but I don't get how they got that as the answer

Science physics
mandy drops a 2.0kg book from a height of 4.5m. how much work has gravity done on the book? M=2.0kg D= 4.5m Not actually sure what to do next. Because none of the formulas work. I need work but I don't even know the force. To find force I need mass which I have but I don&#...

Science
Oh. That makes sense. I misunderstood and thought 0.5 had 2 significant figures but it has 1. Thank you so much!

Science
However the answer on my answer key says 5×10^1 N. I'm confused on how they got that

Science
A bicycle and its rider have a combined mass of 90kg. The cyclist is accelerating at 0.5m/s^2. What minimum force is he exerting? F=m•a F=90kg•0.5m/s^2 F= 45N However the answer on my answer key says 5×10^1

Math
Starting at the top, if you cut a square pyramid in half using a single cut, what is the shape of the newly-exposed section?

Science
why is using a ramp to load a heavy object into the back of a moving truck easier than lifting it in?

Language arts poetry
in the poem the tide rises the tide falls Longfellow uses figurative language in repetition in a paragraph identify the symbolism and repetition used in the poem explain how both are connected to the meaning of the poem include details from the poem in your paragraph The tide ...

Physics
A 10.0 kg box is placed on a ramp that is inclined at 30.0 degrees to the horizontal. Determine the force of friction required to keep the block stationary. Determine the minimum coefficient of friction required to keep the box stationary.

Physics
A 12.0 kg object is on a surface that is inclined 30 degrees and the coefficient of friction is 0.65. Determine the force of static friction if the block remains stationary.

Physics
two basketball players collide player 1 with a mass of 55.0 kg experiences a -15.6 m/s2 acceleration. if the player 2 has a mass of 48.5 kg what acceleration did he experience immediately following the collision?

Physics
1. What happens to the stack of books if the applied force exceeds the maximum static frictional force? 2. What is the minimum size for the static frictional force, and under what conditions will the minimum static frictional force be observed? 3. What type of friction acts ...

math
For exersizes 1-4 describe the population, the sampling plan, and the sample 1. A magazine for teenagers asks its readers to write in imformation about how they solve personal problems

chemistry
Initially you have 204 g grams of solid thallium at is at its melting point of 304ºC . How many grams of liquid thallium will be present after 476 joules of heat have been added. specific heat liquid thallium is 0.13j/g ºC; heat fusion = 21 j/g; boiling point ...

Physics
A 34.0 kg block accelerates along a frictionless ramp that is inclined at 35 degrees. Determine the acceleration of the block.

Physics
A 12.0 kg object is on a surface that is inclined 30 degrees and the coefficient of friction is 0.65. Determine the force of static friction if the block remains stationary.

Physics
A plane with a mass of 4.50 x 10^3 kg accelerates on takeoff at 10.0 m/s2. What is the net force acting on the plane?

Physics
Two basketball players collide. Player 1, with a mass of 55.0 kg, experience a -15.6 m/s2 acceleration. If player 2 has a mass of 48.5 kg, what acceleration did he experience immediately following the collision?

science
the fence posts around a large pasture are 2.5m apart. a horse starts running west beside the fence. when the horse passes the fifth fence post, your second hand is on the 9.0 mark. when the horse passes the fourteenth fence post, the second hand is on 11.5 seconds. what is ...

Science - physics
the fence posts around a large pasture are 2.5m apart. a horse starts running west beside the fence. when the horse passes the fifth fence post, your second hand is on the 9.0 mark. when the horse passes the fourteenth fence post, the second hand is on 11.5 seconds. what is ...

Organic Chemistry
(i can't upload an image so i have to explain the spectrum) My spectrum has peaks at 0.85 ppm (integration = 1.49) 1.2 ppm (integration = 7.93) 1.5 ppm (integration = 1.11) 3.6 ppm (integration = 1) the only one that shows clear peaks is the one at 3.6 ppm, which appears ...

Chemistry
Thank you so much

Chemistry
Temperature values are used to determine relative vapor pressure in compounds. Explain principles involved that allows temperature and vapor pressure to be related in this fashion. I understand the type of liquid and intermolecular forces are involved. But, I do not understand...

Calculus (trig derivatives)
A lighthouse 2 miles offshore has a light that rotates once every 20 seconds. At what rate is the light traveling along the shore if it is shining on a point 4 miles along the shore from the point nearest the lighthouse?

Maths
Hi Sammy this may sound extremely outrageous and I don't know if your active but do you know the answers for gifted and talented L.A. At connexus for unit 2 sounds and ideas unit test closed book it's 20 questions and I'm so confused

chemistry
To determine the molecular weight of a liquid compound,1.56 grams of the compound is vaporized in a 0.555L container at 30ºC and the pressure is measured as 1.2 atm. What is the molecular weight of the compound?

chemistry
Question 16 options: A mixture of equal moles of He and Xe are in a plastic container at 25ºC and 874 mm pressure. If only He leaks from the container and the pressure decreases to 600 mm at 25º C, what is the mole fraction of (1) He and (2) Xe in the container after...

Chemistry
KClO3 decomposes according to the reaction below. How many grams of KClO3 are needed to produce 826ml of O2 at standard temperature and pressure? 2KClO3 ? 2KCl + 3O2

Science
Meh, I think your not so much checking your test as you are coming to copy off it. *No hard feelings*.

Science
Are you sure

Math
I'm not sure if this is right but this is what I have so far 2cos^2 +sinx -1 =0 2cos ^2 x+sinx =1 (I added 1 to both sides) Cos^2 x +sinx

Math
Solve equation for 0< Equality x < 2pi Trig equations

Math

Math
Suppose k is a continuous function so that k(-2)=3 and k'(-2)= -4 . a. Use the given information to approximate the value of k(-1.4). b. If k''(x)<0 for -3<=x<=0 , will the approximation for k(-1.4) you found in part (a) be greater than or less than the ...

Chemistry
Thank you so much!

Chemistry
I am completely lost with this question. If 50 ml of 0.5M HCl is added to 800 ml of pure water, what will be the approximate pH of the resulting solution?

Precal

Precal
Sin^2x/cosx =tanxsinx I need help in verifying also please tell me what identity u started with thank you!

precal

precal
(sin x + cos x)^2 tan x = tan x + 2 sin^2 x please help me verify the identity

Biology
The p53 enzyme system prevents progression to which stage of the cell cycle? choices are: 1. G1 2.Cytokineses 3.S phase 4. Mitosis 5. G2 * I think it's S phase, It's not G1 right?

Trig Identities
secx - sinxtanx

Calc. Based Physics
10.1 Three uniform spheres with masses m1 = 6.0 kg, m2 = 2.0 kg , and m3 = 4.0 kg are fixed at the positions shown in the diagram. Assume they are completely isolated and there are no other masses nearby. m_1 | | 3cm | m_2-- P ^ | 1cm |2cm m_3 (a) What is the magnitude of the ...

World History
Choose four of the following questions to ask Moses, Jesus, and Muhammad:? Ok I choose the questions and I got the first and third one I just need help with the second and forth question •Why is the Holy Land an important site for your faith? Moses: The book of my people ...

Math
Assume the carrying capacity of the earth is 9 billion. Use the 1960s peak annual growth rate of 2.1?% and population of 3 billion to predict the base growth rate and current growth rate with a logistic model. Assume a current population of 6.8 billion. How does the predicted ...

Science
What are some ways (at least two) that cells can increase their (Unicellular and multi-cellular organisms) surface area to volume ratio without splitting into multiple cells?  One way that cells can increase their surface area to volume ratio without splitting into ...

What are some ways (at least two) that cells can increase their (Unicellular and multi-cellular organisms) surface area to volume ratio without splitting into multiple cells? One way that cells can increase their surface area to volume ratio without splitting into multiple ...

Math1
Since the bacteria is doubling every hour, it won't be multiplying by 2. So 24 times 2 won't be the formula. Instead you would square it. doubles so 2^24.

science
What are some ways (at least two) that cells can increase their (Unicellular and multi-cellular organisms) surface area to volume ratio without splitting into multiple cells? I am having trouble finding information on the ways.

LESSON 12 Social Studies 8 B Unit 3: Reconstructi
I'm stuck on the same question is the answer A?

Science
For this activity, we had to make cube shaped models to represent cells. Then we had to compare surface area, volume, and surface area to volume ratio (SA:V) between the cells.  Cell A:  length of one side=1cm  Surface area= 6cm^2  Volume= 1cm^3  SA:V...

Algebra
Yup that's correct, 336

Math
Find the change in mass. So difference of 54 and 48 is 54-48 = 6 Now the original mass is 48 so you would divide 6/48 = 0.125×100=12.5 Your answer should be 12.5% I'm pretty sure

science
For this activity, we had to make cube shaped models to represent cells. Then we had to compare aurafve area, volume, and surface area to volume ratio (SA:V) between the cells. Cell A: length of one side=1cm Surface area= 6cm^2 Volume= 1cm^3 SA:V= 6 Cell B: Length of one side...

Calculus
If ln(x^2-15y)=x-5+5 and y(-4)=1 find Y prime(-4) by implicit differentiation thus the equation of the tangent line to the graph at the point (-4,1) is y=

math help
Ms.sue may you help me? A user named Cory is keep on bothering me. Every time I post this question, Cory harasses by saying they know the answer and they aren't going to tell me. I need help with this issue and also with this math problem. Thank you for your time and effort

math help
Given f(x)=7-2x find f (x+5)   I'm not sure how to approach this problem.   I have done this so far:   F(x+5) = 7-2x   F(x+5)=7-2(x+5)   F(x+5)=7-(2x+10)   Not sure if this is right and what to do next.

math
Oh. Thank you so much! I am glad that you helped.

math
Given f(x)=7-2x find f (x+5)  I'm not sure how to approach this problem.  I have done this so far:  F(x+5) = 7-2x  F(x+5)=7-2(x+5)  F(x+5)=7-(2x+10)  Not sure if this is right and what to do next.

math
I've been trying to solve it for a ay already and decided to ask on here. May I please get help on how to do this? It'll be great and I'll appreciate if you could help.

math
Given f(x)=7-2x find f (x+5) I'm not sure how to approach this problem. I have done this so far: F(x+5) = 7-2x F(x+5)=7-2(x+5) F(x+5)=7-(2x+10) Not sure if this is right and what to do next.

Chemistry
Determine the pH of a solution after 20.00 mL of 0.4963 M HI has been titrated with 12.64 mL of 0.5174 M NaOH.

Chemistry
Consider the titration of 20.00 mL of 0.1728 M Ascorbic acid (Ka = 7.9 x 10-5) with 0.4329 M NaOH. Match the following regions in the titration curve with the appropriate pH range. 1.Initial pH 2.Before equivalence point 3.At equivalence point 4.After equivalence point A. 8 - ...

Chemistry
Determine the pH of a solution after 20.00 mL of 0.4963 M HI has been titrated with 12.64 mL of 0.5174 M NaOH.

OChem
Suppose a student obtained a 0.15g of cruse salicylic acid. How much water would be needed to just dissolve it at 75 degrees Celsius? How much salicylic acid would remain dissolved in that amount of water at just 10 degrees Celsius? What percent of the original mass of the ...

English
Should animals be tested for science research