Sunday

May 24, 2015

May 24, 2015

Total # Posts: 6,657

**Chem**

I still am lost on how to find OH- Kw being 1 x10^-14 could leave any possibility for H
*May 20, 2015*

**Chem**

Mostly the H+ is what is confusing me
*May 20, 2015*

**Chem**

Compute values for [H] [OH] and pH of the following aqueous solutions. Tabulate the answers for comparison. Spell out the reasoning in each calculation a) 0.010M HCL b)0.0010M NaOH c) 0.010 N Ba(OH)2 (strong electrolytes assumed to be 100% dissociated.
*May 20, 2015*

**pre-algebra**

55=8-6t+3+2t
*May 19, 2015*

**Math**

A spherical water balloon has a diameter of 10 cm. How much water is needed to fill the balloon, in cubic centimeters? Round your answer to the nearest centimeter. (Use 3.14 for π.)
*May 19, 2015*

**education**

Have you changed in regards to how you work with children?
*May 18, 2015*

**Calculus**

Please check my answers. Solve the following equations and/or system of equations for the unknown variables. 1. x^2-3x-12=0 x= 3 + sqrt(57) / 2, x= 3 - sqrt(57) / 2 2. x+y=8 , 3x+2y=2 x=-14, y=22 3. 3x + 2y =10 , x+y=5 , y+z =9 x=0,y=5, z=4 4. 1/x-p1z=0, 1-p2z=0, I-p1x-p2y=0 ...
*May 18, 2015*

**education**

Has your understanding of young children changed as a result of your practicum experience? Explain. can anyone explain what this question is asking for?
*May 18, 2015*

**Physics**

See I having trouble with this question because I could just used - GM1M2/R but this is respect to Earth. So I have no idea how to set this up.
*May 14, 2015*

**Physics**

A satellite of the Earth has a mass of 1550 kg. It orbits Earth with a mean radius of orbit of 7.00 x 10^6 m. a) What is the gravitational potential energy of the satellite with respect to Earth?
*May 14, 2015*

**science please help**

after the dna strands are separated, which of the following is the next step of DNA replication in the S phase of the cell cycle? Action of helicase formantion of RNa primer breaking go hydrogen bonds joining of nucleotides i think either B or D
*May 13, 2015*

**science please help**

in evolutionary terms, RNA is thought to have preceded proteins and DNA. Which of the following observations provides the most convincing support for hypothesis? a) there are more types of RNA than there are DNA b) RNA contains combined catalytic, structural, and genetic ...
*May 13, 2015*

**science please help**

after the DNA strands are separated, which of the following is the next step of DNA replication in the S phase of the cell cycle? A) Action of helicase B) formation of RNA primer C) Breaking of hydrogen bonds D) joining of nucleotides i think it is either B or D
*May 13, 2015*

**science please help**

therefore it would be B since mitochondria deals with atp right??
*May 13, 2015*

**science please help**

i was debating between B and A. but I am a little more on B
*May 13, 2015*

**science please help**

Which of the following factors is the most likely explanation for an energy deficit that results in exercise-induced exhaustion? a. inefficient protein production b. insufficient mitochondrial function c. impaired urea elimination d. absence of oxygen transporters on the cell ...
*May 13, 2015*

**science @elena please help**

it has been hypothesized that chloroplasts originated from photosynthetic cyanobacteria that became symbiotic inside a host cell. Which of the following observations provides the strongest evidence for this suggestion? A) microscopically, chloroplast appear similar to ...
*May 13, 2015*

**math**

30 - 24 = 6 students were absent, therefore 6 (who were absent) divided by 30 (the total number of students) which becomes 0.2 but you should multiply by 100 in order to get percentage. Therefore, 0.2 x 100 = 20%
*May 13, 2015*

**grade 5 math**

In order to figure out percentage you should know which numbers are dividing by each number. Based on the question, 240/3000 = 0.08 However, when you want to get a "percentage" you should multiply by 100 which becomes 8%. Therefore 8% of teeth was lost.
*May 13, 2015*

**Math**

The questions doesn't provide sufficient information. I recommend you look over your question again.
*May 13, 2015*

**Math**

In order to figure out consecutive odd numbers you should know what numbers should be included. Odd numbers basically means the number that isn't multiples of 2 such as 1,3,5, and etc. Therefore 203,205,207 are the three numbers.
*May 13, 2015*

**Physics**

How much work is needed to move a -8.00 uC charge from the ground to a point whose potential is +75.0V ? I know -8.00 uc = -0.8 x 10^-6 then I used W = Fd but I can't seems to get right answer any hint is appreciated.
*May 13, 2015*

**Physics**

If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the Sun would this planet be? The answer for this one is 1.6 earth radii, but I can't seems to get solution to find the answer. I would appreciate for any hint or help.
*May 12, 2015*

**Chemistry**

It's half life - try looking in your book.
*May 11, 2015*

**maths**

simplify the square root of 20 minus the square root of 5 plus the square root of 45
*May 10, 2015*

**Physics**

Calculate the tension in the string if a single pulley of velocity ratio 5 is used to raise a body of mass 200g through a distance of 4cm.
*May 9, 2015*

**Math**

tan theta = 842/72.6
*May 6, 2015*

**education**

The children’s performance in relation your main objective listed on the activity plan what is this question asking. example please
*May 3, 2015*

**Calculus max/min**

d=0.767. There are two parallel sidewalks that are separated by the park that is 600 feet wide. You are standing on the south sidewalk facing east. On the north sidewalk, 2000 feet ahead of you, is a bus stop. You can walk on the sidewalk at 5.5+d feet per sec. You can walk ...
*May 3, 2015*

**Education**

What view do you have of the children's skills and competencies? In what ways do you need to transform your view of children to see them in a more positive light? what is this question asking for? example please.
*May 3, 2015*

**math**

thank you guys. I really appreciate the help.
*May 2, 2015*

**math**

can you answer it, mrs. sue?
*May 2, 2015*

**math**

yes
*May 2, 2015*

**math**

You were given 10 math problems for homework. You completed 310 of them at school. Which equation shows how to find the fraction of the problems you still must do to complete your homework?
*May 2, 2015*

**Law & Ethics**

yes, I too believe it is D. you answer that, Debbie!
*May 2, 2015*

**math: 68-95-99.7 rule**

suppose that prices of a certain model of new homes are normally distributed with a mean of $150,000 use the rule to find the percentage of buyers who paid: between $150,000if the standard deviation is $1200
*April 30, 2015*

**physics**

A football kicker can give the ball an initial speed of 25m/s. What are the greatest and least elevation angles at which he can kick the ball to score a field goal from a point 50m in front of goalposts whose horizontal bar is 3.44m above the ground?
*April 30, 2015*

**Calculus and Vectors **

A plane is flying south east at a constant speed of 900km/h. The wind is blowing towards the north at 100km/h. Determine the resultant velocity of the plane relative to the ground.
*April 29, 2015*

**chemistry**

Table of enthalpy of solution for selected cesium salts Compound and ΔsolH kJ mol-1: - Cesium bromide: 25.98 - Cesium iodide: 33.35 - Cesium chloride: 17.78 - Cesium fluoride monohydrate: -10.46 - Cesium fluoride sesquihydrate (·1.5H2O): -5.44 Data taken from CRC ...
*April 29, 2015*

**Math**

By using the numbers 1, 1,1, 5 and 6 only once but need to use all and using any math get the number 51
*April 28, 2015*

**Calculus I**

Marketing tells you that if you set the price of an item at $10 then you will be unable to sell it, but that you can sell 500 items for each dollar below $10 that you set the price. Suppose your fixed costs total $3000, and your marginal cost is $2 per item. What is the most ...
*April 28, 2015*

**Economics**

A business can produce its product in different versions: Version A has a basic design and a lower cost and Version B has an upgraded design and a higher cost of production. The business knows there are different types of customers, “High” demand (H) and “Low&#...
*April 28, 2015*

**physics**

The figure above shows a chain being held on a table with one quarter of its length hanging over the edge. Friction is negligible. The chain has length L = 24 cm and mass m = 0.012 kg. Calculate how much work is required to pull the hanging section back onto the table.
*April 25, 2015*

**physics**

A 13 ohm, 35 ohm, and 2k ohmresistor are connected in a series circuit with a 190 V battery. What is the equivalent resistance of the circuit?
*April 24, 2015*

**Calculus Indefinite Intergral**

I need help with integrating these two problems. Im stuck. 1. integrate (sin^-1)dx/((1-x^2)^3/2) sin^-1 aka arcsin 2. integrate dx/((1-x^2)^3/2) by using 1/z Any and all help will be appreciated!
*April 22, 2015*

**Chemistry HW Need answers**

1.Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) How many liters of carbon dioxide ...
*April 22, 2015*

**Chemistry**

Is the answer right 11.2
*April 22, 2015*

**Chemistry**

90/180.1559 =0.4995 0.4995*22.4 A. =11.2 Is this correct
*April 22, 2015*

**Chemistry test can't fail please help (senior)**

1.Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) How many liters of carbon dioxide ...
*April 22, 2015*

**Chemistry**

1.Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) How many liters of carbon dioxide ...
*April 22, 2015*

**Chemistry**

I don't know what to do once I get the .49999 number
*April 22, 2015*

**Chemistry**

Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) How many liters of carbon dioxide would...
*April 22, 2015*

**Chemistry test help please**

How many liters of chlorine as can be produced when 1.96 L of HCl react with excess O2 at STP Show Work A.0.49L B.0.98L C.1.96L D.3.92L
*April 22, 2015*

**Chemistry**

Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) How many liters of carbon dioxide would...
*April 22, 2015*

**Chemistry**

Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen
*April 22, 2015*

**biology**

1.1 The gametophyte generation in a fern plant changes to the sporophyte generation by A.fertilisation B.melosis C.asexual reproduction D.fusion of spores the answer is A.fertilisation right? 1.2 the male cone differs from the female cone in the pine in that A.only the male ...
*April 19, 2015*

**College Physics**

This figure shows an overhead view of the path of a 0.187 kg ball as it bounces from a rail of a pool table. The ball’s initial speed is 2.19 m/s. The angle θ1 shown on the sketch is 30.0o. The bounce exactly reverses the y component of the ball’s velocity but ...
*April 16, 2015*

**Chemistry **

What volume (in mL) of 0.55 M Na2SO4 solution is needed to precipitate all the barium, as BaSO4(s), from 15.5 mL of 0.25 M Ba(NO3)2 solution?
*April 16, 2015*

**math**

find the length of an arc of a circle of radius 5.6 cm which subtends an angle of 60 degrees at the centre of the circle.(take pie as 22 divided by 7.)
*April 15, 2015*

**math**

i cant figure it out
*April 13, 2015*

**math**

How do i find the 12th term of the sequence 36,18,9.... using a formula
*April 13, 2015*

**math**

find the number of terms for the following sequence. 125,109,93,.......-115 i got the answer of 15 terms. How do i get it though using a formula?
*April 13, 2015*

**math**

find the missing terms for the following sequence geometric sequence 96,__,__,__,6
*April 13, 2015*

**math**

should it be a fraction?
*April 13, 2015*

**math**

find the 12th term of the sequence 36,18,9....
*April 13, 2015*

**chemistry**

How much heat is produced by the complete reaction of 5.91kg of nitromethane?
*April 13, 2015*

**english**

15. Identify the sentence in which the underlined pronoun is used incorrectly. There are only six days left in the school year. It will be fun to visit their house in the summer. Their just going to have to wait to see the movie. Greg refused to go there because of the bad ...
*April 10, 2015*

**Calculus**

The sun is setting at the rate of 1/4 deg/min, and appears to be dropping perpendicular to the horizon, as depicted in figure 6.2.5. How fast is the shadow of a 25 meter wall lengthening at the moment when the shadow is 50 meters long?
*April 9, 2015*

**math**

Five friends picked 7 pounds of apples. They will share the apples equally. How much will each get?
*April 7, 2015*

**english**

this is simple, in the sentence it says "Her screaming" so the answer is d because it was her screaming
*April 6, 2015*

**chemistry**

17. Calculate H for the following reaction using Hess law H2 (g) + Br2 (g) → 2 HBr (g) Experimental information 2 H+ → H2 H -436.4 kJ 2 Br- → Br2 H -192.5 kJ 2 H+ + 2 Br- →2 HBr H -144.8 kJ
*April 2, 2015*

**self**

I have 10 letters. My 1st and 2nd letter means not. My 1st to 5th letter means below. My 6th to 10th letter is to stand. In all, I am when you know. What am I?
*April 2, 2015*

**Math**

prime numbers could be 2, 3, 5, 7, 11, etc. What happens with 2, 3 which gives us 6? or with 5, 7 which gives us 35? Can you finish it from here?
*March 30, 2015*

**Math**

Change 3 3/4 to an improper fraction by multiplying 4 times 3 and adding it to the numerator 15/4 multiply by 6/1 multiply 6 times 15 and 1 times 4 Divide 90 by 4 to get your answer.
*March 30, 2015*

**Math**

If there are 6 numbers on the die, then you have 1/6 of getting the number 5. To get a blue it looks like you have 1/4. For both to happen together (indicated by using "and") then, multiply the two fractions to get your probability. You are correct with answer B.
*March 30, 2015*

**phusics**

a 50g bullet is shot from a rifle at 900m/s a) what is the KE of the bullet? b) how much work is done on the bullet if it starts from rest?
*March 30, 2015*

**geometry**

the tree is opposite the angle and the 50 feet is adjacent to the tree. opposite/adjacent = tangent x/50 = tan 48. Find tan 48 and multiple by 50 to find "x" which is the height of the tree.
*March 30, 2015*

**math**

75 pupils sat for a Science Test. The average score was 58 marks. If the average score of the girls was 62 marks and the average score of the boys was 56 marks, how many boys sat for the test?
*March 27, 2015*

**Civics**

Does the prefix "bi" give you a hint?
*March 27, 2015*

**Math Help!!!**

It looks like we are taking 1/2 of the previous number or dividing by two. Any time you are multiplying or dividing you have a geometric sequence. If you are adding or subtracting a constant, then you have an arithmetic sequence.
*March 27, 2015*

**Ethics in Technology**

I think it might be C. I don't think their salaries went up.
*March 27, 2015*

**math**

You will have a right triangle with the 80 meters on the hypotenuse and the x on the side opposite the 75 degree angle. Using Trig: x/80 which is opposite over hypotenuse equal to sin of 75 degrees. Find the sin of 75 and multiply it by 80 to find x.
*March 27, 2015*

**Algebra 2**

If you take the square root of 36x^2 you will get 6x. This is fine because you only have one term. But, if you take the square root of 36 - x^2, you can't take the square root of each part when you are adding or subtracting which causes you to have more than one term. The ...
*March 27, 2015*

**Math**

Jane will receive 18% less of her regular pay when she retires. Her regular pay is $500 per week. a How much would she receive per week if she retires today? answer: 500/18% = 90 500-90= $410 b. Explain how you can make this same calculation using 100%-18%=82% answer: same as ...
*March 26, 2015*

**chemistry**

which of the following molecules will exhibit hydrogen bonding? a. CH3OCH3 b. HF c. CH4 d. LiH
*March 25, 2015*

**French**

Please unscramble O É N C A R C S in French. It is a verb.
*March 25, 2015*

**Physics**

Water flows horizontally in a tapered pipe at a rate of 500 m^3/h. The area at one section of the pipe is 6500 mm² and 4000 mm² at another section. Calculate the gauge pressure at the larger section if the pressure at the smaller section is atmospheric.
*March 23, 2015*

**History**

. In __________ trials, the judge is both the trier of law and the trier of fact. A) de novo B) bench C) jury D) pro se I have a feeling it could be bench
*March 22, 2015*

**math**

Mary invested $3,750 for 42 months at a simple interest rate of 3.85%. How much interest did she earn?
*March 18, 2015*

**math**

Evaluate using L'Hopital Rule? lim as x approaches x from left (1-x)^(3/x)
*March 18, 2015*

**calculus**

The graph of the function y=x^5-x^2+sinx has a point of inflection at x= a. 0.324 b. 0.499 c. 0.506 d. 0.611 e. 0.704 Thanks.
*March 15, 2015*

**English Literature**

I read William G Mcloughlin's essay "Pietism and the American Character" and I didn t understand anything I need a brief summary of the main ideas
*March 15, 2015*

**calculus**

What is the limit, as x approaches 1, of (sqrt(x) - 1)/(x - 1)? I need to show work, but I know the answer is 3/2, because I confirmed with a TI-89.
*March 15, 2015*

**physics**

A 450 kg car traveling north at 30 m/s collides with a 560 kg car traveling west at 35 m/s. If after the collision they become entangled and move off together, (a) what is magnitude of the final momentum of the cars? (b) What is their final speed of the cars? (c) What is their...
*March 15, 2015*

**chemistry**

100 / 960 = 150 / x 960 x 150 = 100x ??? = 1440 mm of Hg
*March 12, 2015*

**Finance**

Antiques ‘R’ Us is a mature manufacturing firm. The company just paid a dividend of $11.45, but management expects to reduce the payout by 4.5 percent per year, indefinitely. Required: If you require a return of 11 percent return on this stock, what will you pay for...
*March 11, 2015*

**chemistry**

when 5g of impure sample of CH4 is completely combusted, 9g of H2O was produced.what is the percentage purity of the sample of CH4
*March 11, 2015*

**math**

For which pair of functions f(x) and g(x) below will the lim f(x)/g(x)equal 0 x-infinity f(x) e^x; g(x) = x^3 f(x) x^5; g(x) = e^x f(x) x^3; g(x) = ln(x) f(x) x^negative 2; g(x) = e^negative x
*March 9, 2015*

**math**

The area A equals = πr^2 of a circular oil spill changes with the radius. At what rate does the area change with respect to the radius when r equals= 3ft? This is 9pie right? not 6pie?
*March 9, 2015*

**Math**

Let x = time (days) for all 3 then x(1/4 + 1/10 + 1/5) = 1 multiplying both sides by 20 x(5 + 2 + 4) = 20 x(11) = 20 x = 20/11 x = 1.82 days or x = 1 day, 19 hours and 38 minutes
*March 8, 2015*