# Posts by Sarah

Total # Posts: 5,839

**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

**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**

Please Help Solve each equation for 0<x<2 pi 2cos^ 2 x +sins-1=0

**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 **

Cot^2x-csc^2x Please help me simplify using identities! Thank You!

**Precal **

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

**precal**

using trig identities and I need to verify please help

**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 ...

**Science please help**

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

**English**

that* instead of at

**English**

All things considered, it seems reasonable that injecting a small dosage of drugs in animals is acceptable. This practice could help to find cures for the illnesses as well as animals. Having said that people are not acknowledging the positive results of these trials. Another ...

**English**

It's for my argumentative essay

**English**

I'm not against it...

**English**

what percentage of animal testing is successful

**English**

Thanks