# Posts by Sarah

Total # Posts: 5,805

**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

**English**

All things considered, it seems reasonable to that injecting a small dosage of drugs in animals is acceptable. This practice could help to find cures for the illnesses. Like so?

**English**

What do u mean by put a period after acceptable?

**English**

All things considered, it seems reasonable to that injecting a small dosage of drugs in animals is acceptable as this practice could help to find cures for the illnesses

**English**

I don't get it...

**English**

All things considered, it seems reasonable to accept that injecting a small dosage of drugs in animals is acceptable as it could help and improve to find cures for the illnesses. How can I improve? what words shall I remove?

**English**

All things considered, it seems reasonable to accept that injecting a small dosage of drugs in animals as it could help and improve of find cures for the help

**English **

How can I rewrite this sentence using parallel structure? The stirring closing paragraph is the formal pronouncement of independence and borrowed from the resolution of independence adopted by congress July 2, 1776.

**Biology**

A biologist found that 20% of a population of bats are brown, which is recessive. assuming the population shows Hardy-Weinberg equilibrium, determine the genotype and the allele frequencies of the population?

**Math**

Tan 57= f/70 f= 70tan 57 =107.79 tan 59 =(f+t)/70 f+t= 70 tan 69 =182.356 t=70 tan 69- f =70 tan 69 - 70tan 57 = 74.5m

**Physics**

The femoral artery carries blood to the leg and has a diameter of 12.5 mm. What is the resistance in a column of blood that is 2.20 cm long if the conductivity of blood is 0.630 ?-1m-1?

**Math**

A Gallup poll asked two questions: 1. Do you favor a tax cut or “increased spending on other government programs”? Result: 75% favored a tax cut. 2. Do you favor a tax cut or “spending to fund new retirement savings accounts, as well as increased spending on ...

**math**

Simplify the expression 23w^3-5w^2x+8wx^2-8w^3-13wx^2+30w^2x Group like terms so: 23w^3-8w^3= 15w^3 -5w^2x+30w^2x= 25w^2x 8wx^2-13wx^2 = -5wx^2 The final answer I got is: 15w^3+25w^2x-5wx^25wx Is this right? I had to simplify the expression.

**Chemistry**

When 0.010 moles of Zn(s) reacts with 30.0 mL of 1.0 M HCl, the H2 gas produced is collected in a 1.0 L flask at a temperature of 270 K. What is the pressure (atm) of H2 gas collected? Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g)

**Chemistry**

When 0.010 moles of Zn(s) reacts with 30.0 mL of 1.0 M HCl, the H2 gas produced is collected in a 1.0 L flask at a temperature of 270 K. What is the pressure (atm) of H2 gas collected? Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g)

**Physics**

An object is given two initial velocities, one that has a magnitude of 60.0 ms-1 and points along a direction that is 35.0° north of east and the other has a magnitude of 55.0 ms-1 that points 15.0°, also north of east. Determine the resultant velocity of the object.

**Physics**

A plane travels 3 km due north, then 5 km due northeast. Represent these two displacements graphically and determine the resultant displacement by finding is magnitude and direction.

**Chemistry**

2AgNO3(aq) + K2CrO4(aq) ==> Ag2CrO4(s) + 2KNO3(aq) Ag2CrO4(s) ===> 2Ag^+ CrO4^^2- Ksp = [Ag^+]^2[CrO4^2-] Ksp = (2x)^2(0.1)

**Chemistry**

Calculate the mass of solid AgNo3 that can be added to 2.0 L of 0.10M K2CrO4 solution in order to just start precipitation?

**calculus**

find y' if x^2y^4+3y-4x^3=5cos x-1 (2x*y^4)+dy/dx 4y^3*x^2)+dy/dx3+12x^2=5-sin-0 dy/dx=-5sin (x -12 x^2)/(2x*4y^3)+(12y^2+x^2) this is using implicit differenation is this correct

**calculus**

find y' if x^2y^4+3y-4x^3=5 cos x-1 (2x-y^4)+(dy/dx4y^3*x^) +dy/dx+12x^2=5(-sin x-1) is this started correctly

**Physics**

sorry, I forgot to inlcude the mass and the angle given. The mass is 10 kg and the angle is 45 degrees

**Physics**

The box is being pulled by a roope across a level floor as shown in the diagram. The box is accelerating at 1 m/s2, the coefficient of kinetic friction is 0.5. what is th tension in the rope?

**Physics**

mg sin theta - F = ma (9.8 sin 30) - 2 / (9.8 cos 30) = 0.34

**Physics**

you are skiing down a slope angled at 30 degrees to the horizontal. Your acceleration is 2m/s^2. what is the coefficient of kinetic friction between you and the hill?

**math**

Oh okay. So since there is a adding or subtracting sign with brackets, all you do is collect like terms? Okay. So it is not distributive property

**math**

Simplify (5x+3)+(8x+1) (5x)+(8x)= 13x^2 (5x)+(1)=5x (3)+(8x)=11x (3)+(1)=4 =13x^2+5x+11x+4 =13x^2+16x+4 Is this right or wrong? Simplify (2t^2-3t)-(7t^2-5t) = (2t^2)-(7t^2)=-5t = (2t^2)-(-5t)= 7t =(-3t)-(7t^2)=-...