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March 25, 2017

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Posts by sarah

Total # Posts: 5,758

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 ...
March 22, 2017

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 ...
March 22, 2017

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.
March 22, 2017

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.
March 22, 2017

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...
March 21, 2017

Algebra
Yup that's correct, 336
March 21, 2017

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
March 21, 2017

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...
March 21, 2017

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=
March 21, 2017

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
March 19, 2017

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.
March 19, 2017

math
Oh. Thank you so much! I am glad that you helped.
March 19, 2017

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.
March 19, 2017

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.
March 19, 2017

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.
March 19, 2017

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.
March 17, 2017

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 - ...
March 16, 2017

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.
March 16, 2017

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 ...
March 14, 2017

English
Should animals be tested for science research
March 12, 2017

English
that* instead of at
March 12, 2017

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 ...
March 12, 2017

English
It's for my argumentative essay
March 12, 2017

English
I'm not against it...
March 12, 2017

English
what percentage of animal testing is successful
March 12, 2017

English
Thanks
March 12, 2017

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?
March 12, 2017

English
What do u mean by put a period after acceptable?
March 12, 2017

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
March 12, 2017

English
I don't get it...
March 12, 2017

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?
March 12, 2017

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
March 12, 2017

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.
March 11, 2017

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?
March 10, 2017

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
March 7, 2017

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?
March 5, 2017

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 ...
March 4, 2017

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.
March 1, 2017

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)
March 1, 2017

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)
March 1, 2017

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.
February 28, 2017

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.
February 28, 2017

Chemistry
2AgNO3(aq) + K2CrO4(aq) ==> Ag2CrO4(s) + 2KNO3(aq) Ag2CrO4(s) ===> 2Ag^+ CrO4^^2- Ksp = [Ag^+]^2[CrO4^2-] Ksp = (2x)^2(0.1)
February 27, 2017

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?
February 27, 2017

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
February 27, 2017

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
February 27, 2017

Physics
sorry, I forgot to inlcude the mass and the angle given. The mass is 10 kg and the angle is 45 degrees
February 25, 2017

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?
February 25, 2017

Physics
mg sin theta - F = ma (9.8 sin 30) - 2 / (9.8 cos 30) = 0.34
February 25, 2017

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?
February 25, 2017

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
February 25, 2017

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)=-...
February 25, 2017

math
(2t^2-3t)-(7t^2-5t) = (2t^2)-(7t^2)=-5t = (2t^2)-(-5t)= 7t =(-3t)-(7t^2)=-10t =(-3t)-(-5t)=2t =-5t+7t-10t+2t I am confused. Why are all my answers "t" and none of them are "t^2"?
February 25, 2017

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?
February 25, 2017

Math
A toy store has found that 30% of its customers spend more than $40 each visit. What is the probability that the next two customers will each spend more than $40?
February 21, 2017

physics
& this one... 4. A person drops 740 g rock originally held 6.5 ft above the ground. What is its velocity the moment before it hits the gound. (Assume rock doesn't gain/lose energy)... (Hint: You will need to calculate the P.E of the rock before it's dropped!
February 19, 2017

physics
Last one! Thankyou for the help thus far... calculate the KE in kJ of 9.100 x 10^5 atoms of silver moving at 1800. km/hr. ... the atoms part is what I'm confused about.
February 19, 2017

physics
I'm not sure with this conversion... getting 9.843x10^4 ft/min to m/s ? How do I get to m/s using a specification conversion without using online conversions?
February 19, 2017

Physics!
stuck on this one!
February 19, 2017

Physics
calculate K.E in Joules of a baseball w/ a mass of 237.2 cg moving at 85.00 mph
February 19, 2017

Physics
The dipole moment of a water molecule is 6.37E-30 Cm. What is the electric potential's magnitude 1.58 nm from a water molecule along the axis of the dipole?
February 19, 2017

Math
Can I please see your solution?Thanks!
February 18, 2017

science
What can people do to reduce global warming?
February 16, 2017

science
what causes clouds to form?
February 16, 2017

Chemistry
Which of the following statements cannot be assumed for the vapourization of a liquid? A)Enthalpy is positive B)Entropy is postive C)Temperature (in degrees Celcius) is positive D)They are all true
February 16, 2017

Chem
Yes
February 13, 2017

Chem
Specify the concentration of each ion in solution for the following: .10 M AlCl3 (aq) and .15 M (NH4)2SO4 (aq)
February 13, 2017

Chem
21.7 mL of 1.15 M KOH (aq) was required to titrate 25 mL of H2SO4 (aq) as follows: H2SO4 (aq) + 2KOH (aq) --arrow-- K2SO4 (aq) + 2H2) (l) What is the molarity of the H2SO4 (aq)?
February 13, 2017

Chem
Add them all together and then divide by the number of dimes. Put your answer in the ones place.
February 12, 2017

Physics
a periscope is an optical instrument made of two plane mirrors inclined at an angle 45 with respect to the axis of the tube. an observer places her eye at point O. draw the path of a ray light issued from A. determine the position and the nature of the image of A given by two ...
February 11, 2017

english 101
yes you are right bc they had drove is wrong bc drove isnot pp
February 10, 2017

english 101
no they had drove make sounds better since its a past perfect ??am I right??tnx
February 10, 2017

english 101
hi guys I need a help in my grammer class?? After throwing their sleeping bags into the backseat of their cars they-- ((had drove/drove/drivig/having driving))--more than 400 miles to reach their destination. I think driving is right.??
February 10, 2017

Spanish 202
I have some answers for my spanish class. I was hoping the grammar could be checked. Antes de estudiar esponal había dormido. Con $100000 compraría una mona. Mi passión ideal sería bombero. Comería muy mucha comida todo día. Si no ...
February 10, 2017

Chemistry
You start with 2.5L of a KNO3 stock solution and wish to prepare 10.0 L of 1.5 M KNO3. What percentage (m/v) would the potassium nitrate stock solution need to be if you were to use it all? (MW of KNO3: 101g/mole)
February 9, 2017

Chemistry
Consider a one step reaction. Which of the following does not describe the activation energy of the process? The minimum amount of energy needed for a reaction to occur The energy difference between the starting point and the transition state The energy required to distort or ...
February 8, 2017

Chemistry
Benzene (C6H6) has a normal freezing point of 5.50oC and a density of 0.88 g/mL. When 1.28 g of naphthalene (C10H8) is dissolved in 125 mL of benzene, the freezing point of the solution is 5.03oC. Determine the molal freezing point constant for this solvent.
February 8, 2017

Chemistry
Consider a one step reaction. Which of the following does not describe the activation energy of the process? The minimum amount of energy needed for a reaction to occur The energy difference between the starting point and the transition state The energy required to distort or ...
February 8, 2017

math
.20x+x=? what is ?
February 7, 2017

Physics
Which is the best example of Newton's Third Law of Motion? A hockey puck sliding on the ice will keep going until it is hit by another player or hits the wall. It takes more force to move a large tractor trailer than it does to move a small sports car. A swimmer who jumps ...
February 3, 2017

Biology
I forgot to mention that the volume of the amalyse stock is 50 ug/ml. and 2.5ml amylase stock and 2.5 ml buffer.......so i think I should take: 50ug/ml/5.0 ml = 10 The the dilution factor is 10x Is this correct do you think?
February 2, 2017

Biology
If I have 2.5 amylase stock solution, 2.5 PBS Buffer, and final amylase concentration of 25 [ug/ml] , how do you calculate the amylase dilution factor?
February 2, 2017

calculus
limx--->0 3sin 3x/4x would it be 9/4
February 1, 2017

calculus
limx-->3 sin 3x/4x
February 1, 2017

Physics
A baseball is thrown at 40 m/s. Jose Bautista hit it back in the opposite direction at a speed of 65 m/s. The ball is in contact for 1.2 ms. What distance does the ball travel while it is in contact with the bat?
February 1, 2017

Math
f(x+h)?f(x)=8hx^2+2hx+2h^2x?3h^2?4h^3. Find f?(x).
January 31, 2017

MATH @Damon @ms. Sue
Belinda wants to invest $1000. The table below shows the value of her investment under two different options for three different years: Number of years 1 2 3 Option 1 (amount in dollars) 1100 1210 1331 Option 2 (amount in dollars) 1100 1200 1300 Part A: What type of function, ...
January 31, 2017

MATH @Damon @ms. Sue
Part A:Option 1 is linear because it increased arithmetically by $110.00 a year. Option 2 is exponetial because it is increased geometrically by $1.09 a year Part B: Option 1 100x+1000 5.5x^2+93.5+1001 Option 2 100(20)+1000 2000+1000=300 Part C: After 20 years she would get $...
January 31, 2017

MATH @Damon @ms. Sue
Can Someone check my Work Belinda wants to invest $1000. The table below shows the value of her investment under two different options for three different years: Number of years 1 2 3 Option 1 (amount in dollars) 1100 1210 1331 Option 2 (amount in dollars) 1100 1200 1300 Part ...
January 31, 2017

Physics
let me try this again area formula is 1/2 x b x h 1/2 x 2.705 x 6.22 m/s = 8.4125 m is this correct? so after 11.7 seconds the particle position will be 8.4125 m?
January 29, 2017

Physics
I just saw related questions so I figured it out. (28.7/53.56)(sin 106) = 0.515 sin-1 0.515= 31.00deg 31.00deg -19deg = 12.00 deg
January 29, 2017

Physics
Two geological field teams are working in a remote area. A global positioning system (GPS) tracker at their base camp shows the location of the first team as 38 km away, 19deg north of west, and the second team as 28.7 km away, 35deg east of north. When the first team uses its...
January 29, 2017

calculus
I have a definition lim theta approaching 0 sin theta/theta = 1 so show if the limit x approaching 0 sin2x/5=2/5
January 29, 2017

Physics
A boy kicks a rock off a cliff with a speed of 15.5m/s at an angle of 53.5° above the horizontal. The rock hits the ground 5.37s after it was kicked. How high is the cliff? I found the height of the cliff which is 7.45*10^1 m. What is the speed of the rock right before it ...
January 29, 2017

Chemistry
The density of water at 60 degrees C is 0.98338 g/mL. What is the mass of 37.48 mL of water in a graduated cylinder (not including the mass of the graduated cylinder)
January 27, 2017

Math
It takes 3 mins to fill a tub to the top and five minutes to drain the full tub.if the faucet and drain are both open how long will it take to fill the tub
January 25, 2017

MATH @Damon @ms. Sue
Thank you so much Steve :)
January 23, 2017

MATH @Damon @ms. Sue
Given the function f(x) = 2(3)^x, Section A is from x = 0 to x = 1 and Section B is from x = 2 to x = 3. Part A: Find the average rate of change of each section. Part B: How many times greater is the average rate of change of Section B than Section A? Explain why one rate of ...
January 23, 2017

Biology
Explain the meanings of Mendel’s principle of segregation and principle of independent assortment. Under what circumstances does the principle of independent assortment hold true? Give an example in which this law does not apply.
January 17, 2017

Pre calc
Evaluate the expression given that cosine a=4/5 with 0<a<pi/2 and sin b=-15/17 with 3pi/2< b<2pi
January 17, 2017

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