Wednesday

January 18, 2017
Total # Posts: 1,821

**science**

i come u face???

*February 22, 2012*

**Chemistry**

Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 18.9 g of biphenyl in 26.4 g of benzene?

*February 22, 2012*

**consumer math**

23. Jeremy had a starting balance of $122.00 in his savings passbook. He made these transactions: Deposits of $68.52 and $46.35; Withdrawals of $95.00 and $20.50; Interest $1.50. What is his final balance? (Points : 2) $125.22 $120.22 $112.22 $122.87 24. Banks pay interest on ...

*February 21, 2012*

**Chemistry**

When 4.73 g of a nonelectrolyte solute is dissolved in 965 mL of water at 28 °C, the resulting solution exerts an osmotic pressure of 945 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is the molar mass of the solute?

*February 21, 2012*

**statistics**

What probability value should be used for determining whether the modified process results in a defect rate that is less than 6%. I got part a and b of the question but I am completely lost on what this is asking me. Can anyone help?!?

*February 10, 2012*

**US Government**

Doing my homework!

*February 8, 2012*

**chemistry**

When do you put the suffix (g) after a compound?

*February 2, 2012*

**statistics**

the answer is the standard deviation is 6 but i don't know how to get that

*January 31, 2012*

**statistics**

the distribution of scores on a test is mound shaped and dsymmetric with a mean score of 78. if 68 percent of the scores fall between 72 and 84, what is the stand deviaition

*January 31, 2012*

**trigmsu**

csc(θ) / cot(θ)

*January 30, 2012*

**trig**

Use a ratio identity to find tan(θ) if given the following. sin=6/sq rt 37 and cos 1/sq rt 37

*January 26, 2012*

**trig**

Find the remaining trigonometric ratios of θ if sin(θ) = -1/6 and θ is not in QIII cos tan cot csc sec

*January 26, 2012*

**trig**

Give the reciprocal of the following. 7/15

*January 26, 2012*

**trig**

If sin(θ) = 8/17 and θ terminates in QI, find cos(θ)

*January 26, 2012*

**trig**

Find y if the point (7, y) is on the terminal side of θ and cos(θ) = 7/25

*January 25, 2012*

**Chemistry**

A certain substance has a heat of vaporization of 34.65 kj/mol. At what kelvin temperature will the vapor pressure be 3.50 times higher than it was at 331 k?

*January 25, 2012*

**5th grade math**

A pair of shorts would cost 12 dollars. I solved it by setting the two equations equal to one another. 2T+2S+42=T+3S+45 Minus 42, minus t, minus 2S gives: T=S+3 So you know S is 3 more than T. Then just trial and error solve to get shorts are 12 dollars and tshirts are 9.

*January 24, 2012*

**geometry**

In parallelogram ABCD, BC = 8, DC = 12, and measure of angle D is 50 degrees. Find the area of the parallelogram to the nearest tenth.

*January 23, 2012*

**physics**

A piece of metal with a mass of 1.9 kg, speciﬁc heat of 200 J/kg ◦ C, and initial temperature of 100 ◦ C is dropped into an insulated jar that contains liquid with a mass of 3.9 kg, speciﬁc heat of 1000 J/kg ◦ C, and initial temperature of 0 &#...

*January 17, 2012*

**Algebra II-Please check**

I'm sorry the computer jammed on an earlier post and I couldn't do anything-so here is the problem I need asistance with Please check and offer advice-I'm NOT SURE IF I USED CORRECT FORMULAS-thank you the problem is List the center, vertices, and foci of hyberbola ...

*January 13, 2012*

**algebra-Please recheck this**

I think I did the vertices and foci incorrect This is a verticl hyperbola, correct? So formula for vertices would be (h, k+-a)=(8,2+-6)=(8,8) (8,-4) Foci should be c^2 = a^2 + b^2 8^2 + 2^2 = 64+36 c=10 foci=(8,2+-10) (8,-8) (8,12)

*January 13, 2012*

**AlgebraIIPlease check-sorry my computer jammed**

I'm sorry the computer jammed and I couldn't do anything- the problem is List the center, vertices, and foci of hyberbola for following equation: (y-2)^2/36 - (x-8)^2/64 = 1 b=6 a=8 Center(8,2) Vertices=(h,k+b) (h,k-b)=(8,8) (8,-4) Foci =(h +-c,k) c^2 = a^2 + b^2 c^2...

*January 13, 2012*

**algebra**

¯3 x 5 + ¯36 ÷ ¯3 -- ¯7 — 10 + 6 x ¯8 ÷ ¯24 —1 =

*January 13, 2012*

**algebra 1**

formula A=P(1+r)^t An account earning interest at a rate of 4% has a principal of $500,000. If no more deposits or withdrawals are made, about how much money will be in the account after five years?

*January 5, 2012*

**penn foster Main ideas**

Both Greta and Fred were on the bus that arrived in Pittsburgh. Fred was glad to be home. He looked forward to visiting with old friends. Greta, on the other hand, dreaded seeing her old boyfriend. She already missed her days in New York City. 16. What can you most safely ...

*January 5, 2012*

**algebra 1**

The midpoint of XY is point M(-12,5). If the coordinates of X are (3,-3), what are the coordinates of Y?

*January 4, 2012*

**math**

Frances sells greeting cards. The materials for a card cost $2.40, and she will include an 80% markup. What is the selling price of each card?

*January 3, 2012*

**Physics**

6meter west

*December 18, 2011*

**algebra**

-10-3/7x=5

*December 18, 2011*

**Algebra**

10A^8/7V^3 TIMES 49R^7/100A MULTIPLY AND SIMPLIFY

*December 17, 2011*

**Algebra**

THANK YOU!!!

*December 17, 2011*

**Electric Power Tools**

just checked you answers, 100% correct

*December 15, 2011*

**Statistics**

9. Assume the weight, W, of a randomly selected adult has a normal distribution with a mean of 175 pounds and a standard deviation of 10 pounds.. Find the probability, P(W < 190), that a randomly selected adult weighs less than 190 pounds.

*December 13, 2011*

**Pre Calculus**

Newton's law of cooling T(t)= Tm + (To-Tm)e^-kt, k >0\ Evaluate T(0). Simplify and explain the result I'm very confused on how to do this, i think i will be able to explain the result but if you could help me simplify this that would be great, Thank you very much.

*December 12, 2011*

**trig**

I get the second one, but the first I don't. What identity are you using for the first to get from line one to two?

*December 11, 2011*

**trig**

Getting ready for trig semester finals. Can't figure out how they are simplifying these equations. (these are the review not actual test) tanx-sqr3=2tanx and 2sin^2+sinx=0

*December 11, 2011*

**Physics**

C. A small force over a long time period. With the small force being divided by a larger number (time), it will have the least momentum.

*December 9, 2011*

**science**

Cool it

*December 8, 2011*

**math**

What is the scale on a map that shows two cities that are 400 mi apart as 2.5 in apart?

*December 8, 2011*

**physics**

what is your final velocity after 680 meters if you start out at 90km/hr and acceleration is 9 m/s

*December 7, 2011*

**geometry**

The scale drawing for a business office is drawn so that 1 cm = 2 ft. If the length of the model is 4 cm and the width is 9 cm, what is the actual area of the business office?

*December 6, 2011*

**Physics**

What is the acceleration of a proton in an electric field of 10^6 N/C?

*December 6, 2011*

**Physics**

What is the acceleration of a proton in an electric field of 10^6 N/C?

*December 6, 2011*

**phi 103**

Which of the following may not qualify as a falsifiable claim?

*December 4, 2011*

**spanish**

OHHHH I got it! Where does one go when one wants to shop at many different types of stores? Sometimes I'm such a simpleton.

*December 2, 2011*

**spanish**

I'm having problem here with number 5. Vamos al ______ could be any number of things... I would assume it's 'shopping' but that isn't accepted...

*December 2, 2011*

**physics**

A convex mirror has a focal length of 15 cm. A 3.0 cm high object is located 10 cm in front of this mirror. Where is the image located?

*December 2, 2011*

**physics**

A 5 meter diameter telescope is used to observe binary star systems. What is the minimum separation distance (perpendicular to the line of sight) for which the two stars can be resolved if they are at a distance of 1,000 light years = 10 m and they are observed in visible ...

*December 2, 2011*

**physics**

Light shines through a single slit whose width is 1.12 mm. A diffraction pattern is formed on a screen located 4.0 m away. The distance between the middle central bright fringe and the second dark fringe is 4.0 mm. What is the wavelength of the light?

*December 2, 2011*

**physics**

A light ray travels from water to air. If the ray strikes the water/air boundary at an angle of incidence of 46 degrees, what is the angle of refractiob in air? (n water = 1.33)

*December 2, 2011*

**Physics**

a 59kg student jumped off the back of a 42kg sailboat, the boat was already travelling at 3.1m/s before she jumped. if she jumpped off with a speed of 2 m/s, how fast was the boat moving? thanks for any help

*December 1, 2011*

**Science**

Are sunspots cooler or hotter spots in our sun? I think it's cooler

*December 1, 2011*

**Science**

What causes day and night? What's the difference between a solar eclipse and a lunar eclipse?

*December 1, 2011*

**Science**

How does Earth have seasons?

*December 1, 2011*

**Government**

blah

*November 29, 2011*

**calculus**

A growing boy who is 4 feet tall stands 8 feet from a 12 foot lamp post. The boy is growing at the rate of 3/4 inches per year. How fast is his shadow growing (in inches per year)?

*November 25, 2011*

**physics**

You need to move a 135-kg sofa to a different location in the room. It takes a force of 92 N to start it moving. What is the coefficient of static friction between the sofa and the carpet?

*November 23, 2011*

**MATH**

So none of these are correct? 2/3 divided 3/5 = 1 1/9 or 2/5?

*November 22, 2011*

**Math**

can you please let me know if these are correct: 1. 5 5/6 x 2 4/5 = 16 2. 2/3 divided 3/5 = 1 1/9 or 2/5? 3. 7/12 divided 2/3 = 7/8 4. 3 1/2 divided 3/4 = 4 2/3 or 2 5/7 5. 4 2/3 divided 7 = 2/3 6. 4 1/5 divided 1 2/5 = 3 7. 2/5 x 5/14 = 1//7 8. 2/3 + 1/7 = 17/21 OR 12/21

*November 22, 2011*

**Pre Calculus**

find all solutions of the equation 1. x^3+27=0 2. x^3-8=0

*November 21, 2011*

**Pre Calculus**

1. Find all rational zeros of the polynomial. Then determine any irrational zeros, and factor the polynomial completely. 3x^4-11x^3+5x^2+3x 2. Find the polynomial with leading coefficient 1 that has a degree of 4, a zero of multiplicity 2 at x=1 and a zero at x=2+i

*November 21, 2011*

**Biology 11**

the genotype of the hybrids of two pure-breeding pea plants that each have white flowers and round seeds (both traits dominant) would be?

*November 20, 2011*

**Pre Calculus**

Find a third degree polynomial P(x) that has zeros at x=-1, x=1, x=2 and whose x-term has coefficient 3?

*November 20, 2011*

**Chemistry**

A typical buffer used by biochemists is called Tris, which can be depicted as R3N. A buffer that is prepared by mixing 500ml of .05M R3N with 500ml of .05MR3NHCl at 25 C has a pH of 8.40. If this same buffer is placed in a cold room at 4 C the pH increases to 9.2. From this ...

*November 17, 2011*

**social studies**

What did the people of ancient Ghana have that the proto-Bantu-speaking people did not? What effects do you think this had on their descendants?

*November 16, 2011*

**Physics**

a) Find the acceleration of the block if the incline is frictionless. b)Find the acceleration of the block if the coefficient of kinetic friction between the block and incline is 0.12.

*November 16, 2011*

**Physics**

A block of mass m = 5.2 kg is pulled up a è = 24° incline as in the figure with a force of magnitude F = 34 N.

*November 16, 2011*

**MATH**

Please help me with these: 1. 5/8 + 5/6 = 2. 2 3/5 + 4 4/5 = 3. 13 1/2 + 7 2/3 = 4. 3/8 - 3/8 = Thanks!

*November 15, 2011*

**MATH**

Please help me with these: 1. 5/8 + 5/6 = 2. 2 3/5 + 4 4/5 = 3. 13 1/2 + 7 2/3 = 4. 3/8 - 3/8 = Thanks!

*November 15, 2011*

**English**

Are there any tutors on here that are familiar with The Canterbury Tales?

*November 13, 2011*

**spanish**

is this past or present tense Mi Papa escribio un cheque

*November 10, 2011*

**math**

gftyftfdtygvtufbu=154545125+45 minutes= hg

*November 10, 2011*

**Math - Calculus III**

Find the double integral of f (x, y) = (x^7)y over the region between the curves y = x^2 and y = x(3 - x).

*November 8, 2011*

**Math**

Find the double integral of f (x, y) = (x^7)y over the region between the curves y = x^2 and y = x(3 - x).

*November 8, 2011*

**political science**

In need of help on my political science homework please help with these questions Only these questions left! One reason why the US has only 2 major parties is that it has: A. insufficient opportunities to bribe candidates B. too much involvement by religious groups C.single-...

*November 6, 2011*

**Chemistry! HELP;**

An atom of potassium (K) has 19 protons: 18 electrons in its inner electron energy levels and 1 electron in its outer energy level. What is the easiest way for this atom to get a filled outer energy level? What is formed?

*November 6, 2011*

**algebra**

can you please help me with these 1. -5/c = 1/3 2. k/8 = -2/5 3. 6/z = -3/5

*November 1, 2011*

**math**

Please help me with these 1. -5/c = 1/3 2. k/8 = -2/5 3. 6/z = -3/5 Thank you

*November 1, 2011*

**Botany**

During the last part of cellular respiration in the mitochondrion, electron flow is tapped and used to make ATP. Where do the electrons end up when they are finished flowing?

*October 31, 2011*

**Math**

Find the general solution of the equations csc^2 θ =4/3.

*October 30, 2011*

**Pre Calculus**

using the factor theorem to show that x-c is a factor of P(X) for the given values of c, and factor 1. P(x)=x3-5x^2+8x-4; c=1

*October 29, 2011*

**Pre Calculus**

Exponential growth and decay find the half life of a radioactive substance if 220 grams of the substance decays to 200 grams in 4 years?

*October 25, 2011*

**CHEMISTRY PLEASE HELP**

a) How will the concentration of NaOH be affected if during the titration some of the solid potassium hydrogen phthalate was spilled during the transfer? Will the concentration of the standardized NaOH increase, decrease, or have no effect? b) How will the molar mass of an ...

*October 24, 2011*

**CHEMISTRY PLEASE HELP**

Using the data collected for part b on your data sheet, calculate the molar mass of the unknown acid. Include the calculation for each trial and the average. Trial One Results: Mass unknown acid: 0.500g Final buret reading: 18.01mL Initial buret reading: 0.11mL Volume NaOh ...

*October 24, 2011*

**CHEMISTRY PLEASE HELP**

Using the data collected for part c on your data sheet and assuming the density of the vinegar is 1.00g/mL, 1) calculate the molar concentration of acetic acid (CH3COOH) in the vinegar sample using the average volume of NaOH. 2) calculate the mass percent of acetic acid in the...

*October 24, 2011*

**Chemistry**

Using the data collected for part c on your data sheet and assuming the density of the vinegar is 1.00g/mL, 1) calculate the molar concentration of acetic acid (CH3COOH) in the vinegar sample using the average volume of NaOH. 2) calculate the mass percent of acetic acid in the...

*October 24, 2011*

**Chemistry**

Using the data collected for part b on your data sheet, calculate the molar mass of the unknown acid. Include the calculation for each trial and the average. Trial One Results: Mass unknown acid: 0.500g Final buret reading: 18.01mL Initial buret reading: 0.11mL Volume NaOh ...

*October 24, 2011*

**Chemistry**

a) How will the concentration of NaOH be affected if during the titration some of the solid potassium hydrogen phthalate was spilled during the transfer? Will the concentration of the standardized NaOH increase, decrease, or have no effect? b) How will the molar mass of an ...

*October 24, 2011*

**statistics**

government data assign a single case or each death that occurs in the u.s. the data show that the probability is 0.45 that a randomly chosen death was due to cardiovascular disease, and 0.22 that i was due to cancer. Suppose a docote checked the cause of death of 2 randomly ...

*October 24, 2011*

**Pre Calculus**

Inverse functions what is the inverse function of f(x)=1/square root of x +1? and f(x)=1-x^2, x<0?

*October 23, 2011*

**Pre Calculus**

Exponential and log functions What initial investment at 8.5% compounded continuously for 7 years will accumulate to 50,000?

*October 23, 2011*

**Pre Calculus**

Inverse functions find the value If f(x)=1/x, find f^-1 (2)

*October 22, 2011*

**Pre Calculus**

Exponential Growth and Decay Find the half-life of a radioactive substance that decays by 5% in 9 years.

*October 22, 2011*

**Pre Calculus**

Logarithms Solve the equation for x 1-ln(3x+2)=0

*October 21, 2011*

**Pre Calculus**

Applications of trigonometric functions Solve the missing parts of the triangle satisfying a=125 b=150 alpha=55 degrees There are two solutions

*October 14, 2011*

**Math**

I have input x (20,1,40,4,8,10) and output y (2,40,1,10,5,4). What is the function?

*October 13, 2011*

**Calculus**

Using Law of Sines: Need Help 1. alpha=70 Degrees Beta=38 Degrees a=35

*October 13, 2011*

**math**

58 cm times 55.6. try to find the area for this problem

*October 11, 2011*

**Physics**

Two blocks are at rest on a frictionless, 20 degree incline. What are the tensions in the two strings if block 1= 5.3kg and block 2= 2.4kg?

*October 10, 2011*

**Physics**

Each of 108 identical blocks sitting on a frictionless surface is connected to the next block by a massless string. The first block is pulled with a force of 108N. What is the tension in the string connecting block 108 to block 107?

*October 10, 2011*