# Posts by sophie

Total # Posts: 476

**Math**

Write the standard form of the equation of the parabola whose directrix is x=-1 and whose focus is at (5,-2)? a) (y+2)^2 = 12(x+2) b) y-2 = 12(x+2) c) x+2 = 1/12(y+2)^2 d) x-2 = 1/12(y+2)^2 I get A and D? confused!

*June 17, 2009*

**Math**

oohh yes i did! thanks!!

*June 16, 2009*

**Math**

oh, so it is C?

*June 16, 2009*

**Math**

For 4x^2 - 4xy + y^2 = 4 find θ, the angle of rotation about the origin, to the nearest degree? a) 27° b) 63° c) 333° d) 307° I got A, is this right?

*June 16, 2009*

**Algebra**

inead help on math homework

*June 14, 2009*

**Math**

oh! thanks for your time!

*June 9, 2009*

**Math**

tan^-1(1/2)=x=.463648 tan^-1(2/3)=y.588003 x+y+pi/2 = -z=2.62245 z=-2.62245 cos (z) = -.868243 and tan a= -1/2 tan b= -2/3 tan (a+b)=(tan a +tan b)/(1-tan a.tan b) so tan (a+b)= -7/4 sec^2 x-tan^2 x=1 so sec (a+b)=√(1+49/16) =√(65/16) (a+b)=1/sec (a+b) so cos(a+b) ...

*June 9, 2009*

**Math**

ohh okay thanks!

*June 9, 2009*

**Math**

If α and β are two angles in Quadrant II such that tan α= -1/2 and tan β = -2/3, find cos(α+β) Work: cos(α+β) = [ 1 - (tan α)(tan β) ] / [ 1 + (tan α)(tan β)] cos(α+β) = [ 1 - (-1/2)(-2/3) ] / [ 1 + (-1/2)(-...

*June 9, 2009*

**Math**

thanks for checking (;

*June 8, 2009*

**Math**

Find the measure of the reference angle for 400 degrees. I did the work and got 40 degrees, is this right?

*June 8, 2009*

**Math**

Thanks for checking!

*June 8, 2009*

**Math**

Find sin(sin^-1 1/4) is the answer 1/4?

*June 8, 2009*

**Math**

never mind, i was right

*June 3, 2009*

**Math**

Write an equation in slope-intercept form of the line whose parametric equations are: x = (1/2)t +2/3 and y = t - 3/4. a) y = 2x - 7/12 b) y = 2x + 7/12 c) y = -2x - 7/12 d) y = -2x - 25/12 I think it is D.....?

*June 3, 2009*

**Math**

thanks for checking!!

*June 2, 2009*

**Math**

Find the ordered pair that represents the vector from A(-4.3,-0.9) to B(-2.8,0.2)? Then find the magnitude of AB. A. (1.5,1.1); 3.46 B. (-7.1, -0.7); 7.13 C. (1.5, 1.1); 1.86 D.(-7.1, -1.1); 7.18 I got C, is this right?

*June 2, 2009*

**Math**

okay thanks

*June 2, 2009*

**Math**

Find an equation of the line that bisects the obtuse angles formed by the lines with equations 3x-y=1 and x+y=-2. a. (3√2 +√10)x-(√10 + √2)y-2√10+√2=0 b. (3√2 - √10)x+(√10 - √2)y+2√10+√2=0 c. (3√2...

*June 2, 2009*

**Math**

oh okay, thought so thanks!

*June 1, 2009*

**Math**

Find the distance between P(-4,3) and the line with equation: 2x - 5y = -7 a. (14√29)/29 b. 0 c. (-16√29)/29 d. (16√29)/29 I got C but would it be positive, like D?

*June 1, 2009*

**English**

well you could do a little of both by saying a catchy sentence and then stating more of the facts

*June 1, 2009*

**Math**

no those are the options for sure :/

*June 1, 2009*

**Math**

it's B?

*June 1, 2009*

**Math**

Use a sum or difference identity to find the exact value of sin225° a. (-√2 - √6)/4 b. (√6 - √2)/4 c. (√6 + √2)/4 d. (√2 - √6)/4 is it A?

*June 1, 2009*

**math**

Yes thanks! I got sqrt10/2 also!!

*June 1, 2009*

**math**

I did the theorem and got 16/√10 ?

*June 1, 2009*

**math**

Find the distance between the lines with equations 3x-y=9 and y=3x-4 a. 5/4 b. (5√10)/2 c. √10/2 d. (13√10)/2 not too sure on this one!

*June 1, 2009*

**Math**

so would 2. be C as well?

*May 29, 2009*

**Math**

The paddle wheel of a boat measures 16 feet in diameter and is revolving at a rate of 20 rpm. The maximum depth of the paddle wheel under water is 1 foot. Suppose a point is located at the lowest point of the wheel at t=0. 1. Write a cosine function with phase shift 0 for ...

*May 29, 2009*

**Math**

thanks

*May 29, 2009*

**Math**

Write an equation of the tangent function with period (3π)/8, phase shift -π/5, and vertical shift -2. a. y=tan((8x)/3 - (8π)/15) -2 b. y=tan((8x)/3 + (8π)/15) -2 c. y=tan((16x)/3 +(3π)/80) -2 d. y=tan((8x)/3 - (3π)/40) -2 I think it is A... or B?

*May 29, 2009*

**math**

In triangle ABC, a=7.8, b=4.2, c=3.9. Find B a. 15.1° b. 148.7° c. 78.9° d. 16.2 ° It is D, right?

*May 28, 2009*

**spelling**

thank you

*May 28, 2009*

**spelling**

If i wanted to shorten the word phenomenal to phenoms would it be es or just s on the end.

*May 28, 2009*

**advanced math**

thought so, thanks!

*May 28, 2009*

**advanced math**

If 0°<= 360°, solve the equation, sec x=-2 a. 150° and 210 ° b. 210° and 330° c. 120° and 240° d. 240° and 300° I believe it is C. am i right?

*May 28, 2009*

**math (matrices)**

Find the values of x and y for which: [2y+5] [x-1] [y - 2] = [ 3x ] is true. a. (-1, -1) b. (-2, -4) c. (5, 1) d. (-1, 4) I got B...?

*May 24, 2009*

**French1**

Complete with the correct form of the partitive. -Benoit va au marche. Il achete _____ fromage. would it be du? -Il achete _____ poires. would it be des?

*May 8, 2009*

**French 1**

oui, merci

*May 8, 2009*

**French 1**

Rewrite the following sentences in the negative. -Je suis de Paris. Would it be: Je ne suis pas Paris. -Michelle est americaine. Would it be: Michelle n'est pas americaine. Am I wrong??

*May 8, 2009*

**grammar**

You said either "the" or "those" would be correct. Why was I be marked wrong for using "the"?

*May 7, 2009*

**grammar**

I was marked incorrect for using the. Any ideas?

*May 7, 2009*

**grammar**

Do you change them to the or those? I think it is the, but I am not sure. Later we cooked them fish and talked about the excitement of the day.

*May 7, 2009*

**grammar**

thank you.

*May 7, 2009*

**grammar**

Then I would go with no change. Correct? Thanks.

*May 7, 2009*

**french**

______ l'equipe ja ponaise a tres bien joue a. Tout b. Toute c. Tous d. Toutes I think it is A? On annonce le de'part de _____ vol? Le vol a destination de Paris? a. quel b. quelle c. quels d. quelles is it A?

*May 5, 2009*

**french**

merci beaucoup!

*May 5, 2009*

**french**

Le train part _____. a. da la voie b. du chariot c. la queue I think it is A?

*May 5, 2009*

**Calculus**

The problem I have is a summation from 1 to infinity for (-1)^n/n. I have to find a partial sum that is in 0.001 of the infinite sum, my teacher says the fourth partial sum approximates the infinite sum, which is -7/12. I think to get within 0.001 of the infinite sum, do I ...

*May 5, 2009*

**french**

merci!

*May 4, 2009*

**french**

Le train arrive et les voyageurs montent _____. a. sur la voie b. en voiture c. devant la gare d. au kiosque I know it isn't d.... not sure though! Le train arrive Presque toujours _____. a. en retard b. a l'heure c. le matin d. l'horaire is it b....?

*May 4, 2009*

**French**

Je descends _____. a. au kiosque b despuis 45 minutes c. au prochain arrete d. a la boucherie I think it is c or b?

*May 4, 2009*

**french**

merci!

*May 4, 2009*

**french**

Choose the correct noun that matches the stated verb below. Choisir a. la fin b. un choix c. la vue d. un atterrissage Is it b? Voir a. la fin b. un choix c. la vue d. une croyance Is it C?

*May 4, 2009*

**French 1**

yes very true! Merci!

*May 4, 2009*

**French 1**

So 1 is A and 2 is A?

*May 4, 2009*

**French 1**

C'est _____ voie? a. quelle b. quelles c. quel d. quele Is it C? Tu voyages avec ______ compagnie aerienne? a. quelle b. quelles c. quel d. quele Is it B?

*May 4, 2009*

**French 1**

merci beaucoup!

*May 3, 2009*

**French 1**

Ils regardent les vetements pour hommes dans ______ de la boutique. a. la caisse b. les soldes c. al vitrine d. au rayon I am thinking that it is c or b??? La Martinique est dans la mer _____ Antilles. a. de b. des c. de l' d. de la is it b?

*May 3, 2009*

**Chemistry**

I need help with the following problem: A fabric remnant from a burial site had a 14 C:12 C ratio of 0.838 of the original value. How old is the fabric? (half-life of 14 C = 5370 years)

*April 29, 2009*

**English- Medieval Period**

this was the only one I missed. Thanks for all help though! It was C. loyalty.

*April 23, 2009*

**English- Medieval Period**

it should say all of the above for D So it is D then?

*April 23, 2009*

**English- Medieval Period**

This refers to Sir Gawain and the Green Knight Gawain's actions at the castle reveal that the knight's moral code values: a. strength b. courage c. loyalty d. NONE OF THE ABOVE I put B, I am not sure though.... ???

*April 23, 2009*

**Allied Health Graded Project**

APA is most common to use. For help you can go to easybib. com

*April 22, 2009*

**Physics**

A beam of unknown charged particles passes at right angles to the direction of magnetic field of 9.0x10^-2 T. If the speed of the particles is 3.0 x10^4m/s and the force experienced is 8.64x10^-16N, how many electric charges are carried by one particle? my Work: F = qvB q = F/...

*April 22, 2009*

**Physics**

yes, 0.45 T thanks for checking!

*April 22, 2009*

**Physics**

A current-carrying wire is oriented at right angles to a uniform magnetic field. If the length of the wire is 0.50 m and it experiences a force of 0.90 N while carrying a current of 4.0 A, what is the strength of the magnetic field? I did the work and got: 0.45 ...???

*April 22, 2009*

**physics**

thought so, thanks

*April 13, 2009*

**physics**

There are four coils of wire being used as electromagnets. They all have the same size and are made up of the same material but have a different number of loops. Which coil will produce a magnetic field with the maximum strength when the same amount of current passes through ...

*April 13, 2009*

**Physics**

there are four right hand rules, I will re-read it so the second one is b thanks

*April 13, 2009*

**Physics**

The polarity of an electromagnet can be determined using the second right-hand rule. A. True B. False Is it B? Current passing through a conductor is increased from 10 A to 15 A. This decreases the strength of the magnetic field produced by the conductor. A. True B. False Is ...

*April 13, 2009*

**Physics!!!**

When does a magnetic field induce maximum EMF in a wire moving with a constant velocity? A. When the wire is moved at an angle of 60 degrees to the direction of the magnetic field B. When the wire is moved at right angles to the magnetic field C, When the wire is moved ...

*April 12, 2009*

**physics**

When does a magnetic field induce maximum EMF in a wire moving with a constant velocity? A. When the wire is moved at an angle of 60 degrees to the direction of the magnetic field B. When the wire is moved at right angles to the magnetic field C, When the wire is moved ...

*April 12, 2009*

**Physics!!**

thanks

*April 12, 2009*

**Physics!!**

An electromagnetic wave is produced by: A. an accelerating charged particle or changing magnetic fields B. an accelerating uncharged particle and changing magnetic fields C. a stationary charged particle and a magnetic field D. any moving particle and a magnetic field I think ...

*April 12, 2009*

**Physics**

An electromagnetic wave has a wavelength of 6.2 x 10^14 m. What is the frequency of the wave? A. 2.0 x 10^6 Hz B. 4.8 x 10^-7 Hz C. 1.8 x 10^24 Hz D. 5.3 x 10^-22 Hz I got B..? When the currents in two parallel metal conductors are in the same direction, the conductors ____ ...

*April 11, 2009*

**Physics**

The polarity of an electromagnetic can be determined using the second right-hand rule. A. True B. False Is it false? Current passing through a conductor is increased from 10 A to 15 A. This decreases the strength of the magnetic field produced by the conductor. A. True B. ...

*April 11, 2009*

**PHYSICS**

I know, it's annoying.... I'm just putting A..

*April 8, 2009*

**PHYSICS**

When a conducting sphere is charged positively, initially the charge is deposited on the left side. However, due to the sphere's conducting nature, the charge spreads uniformly throughout the surface to the sphere. Charge is uniformly distributed because: A. charged atoms ...

*April 8, 2009*

**physics**

okay so it's A, A

*April 7, 2009*

**physics**

so 1-a 2- b

*April 7, 2009*

**physics**

In a series current, each circuit has the same: A. current B. voltage C. capacitance D. resistance If a resistor is added to a series circuit, the equivalent resistance: A. increases B. decreases C. remains the same D. becomes zero

*April 7, 2009*

**10 th grade math**

3(4^2-4) 3(16-4) 3(12) 36<--answer

*April 7, 2009*

**physics**

I know, I think they left out words or something... I'm just going to put C...

*April 7, 2009*

**physics**

A 15.0 resistor and a 20.0 resistor are connected in parallel. A 5.00 resistor is connected across a 1.00 10^2-V battery. What is the current flowing through the 20.0 resistor? A. 1.21 A B. 3.15 A C. 5.00 A D. 6.84 A I don't think it's C....

*April 7, 2009*

**physics**

When two bodies are charged, the total charge before and after charging remains the same because of: A. quantization of charges B. conservation of charges C. law of induction D. Coulomb's law it is B? When a conducting sphere is charged positively, intially the charge is ...

*April 7, 2009*

**physics**

okay so it is B. positively charged that's a neat website

*April 7, 2009*

**physics**

A negatively charged balloon sticks to a wooden door. However, an uncharged balloon does not stick to a wooden door. What is the nature of the charge on the wooden door? A. Electrically neutral B. Positively charged C. Conductor D. Lacking protons I am thinking it is A or B?

*April 7, 2009*

**Physics**

thought so, thanks

*April 7, 2009*

**Physics**

Which of the following statements is true about electric forces? A. Electric forces cause objects to only attract each other. B. Electric forces cause objects to only repel each other. C. Electric forces cause objects to repel or attract each other. D. Electric forces have no ...

*April 7, 2009*

**french**

to have

*April 7, 2009*

**5th grade**

you would subtract 8-2 which equals 6. this would give you 6/8 which is 3/4

*April 7, 2009*

**psychology**

The second one is correct. I am not sure about the first one though.

*April 7, 2009*

**Physics...please help**

A beam of light passes from air to ethanol, with index of refraction of 1.36. If the angle of incidence ( 1) is 30.0 degrees, then calculate the angle of refraction, after light passes through ethanol and enters into air. A. 15.3 degrees B. 21.6 degrees C. 30.0 degrees D. 39.8...

*April 6, 2009*

**physics...**

Light passes from air into water at 45.0 degrees to the normal. If the index of refraction of water is 1.33, find the angle of refraction. A. 25.5 degrees B. 32.1 degrees C. 44.0 degrees D. 55.9 degrees I believe it is B? What is the nature of an image formed by a concave ...

*April 6, 2009*

**Check for mistakes plz**

no problem (:

*April 6, 2009*

**Check for mistakes plz**

In the last sentence, you might want to change it to: The permafrost allows only small bushes to grow. I don't know, something like that. It shouldn't start with "because" though. The rest of it is great!

*April 6, 2009*

**science**

photosynthesis... so A

*April 6, 2009*

**Physics...help!**

Light passes from air into water at 45.0 degrees to the normal. If the index of refraction of water is 1.33, find the angle of refraction. A. 25.5 degrees B. 32.1 degrees C. 44.0 degrees D. 55.9 degrees I believe it is B? What is the nature of an image formed by a concave ...

*April 6, 2009*