# Posts by Sophie

Total # Posts: 478

science
i need to make a p.h indicator in sience but i cant think of any other than.. tea bags, some sort of juice and.. red cabbage anyone got any sujestions?

Spanish
Come up with a question to these answers. Si, de Alicante. No, es médica. No, es argentina.

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!

Math
oohh yes i did! thanks!!

Math
oh, so it is C?

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?

Algebra

Math

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) ...

Math
ohh okay thanks!

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)(-...

Math
thanks for checking (;

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

Math
Thanks for checking!

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

Math
never mind, i was right

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.....?

Math
thanks for checking!!

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?

Math
okay thanks

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...

Math
oh okay, thought so thanks!

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?

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

Math
no those are the options for sure :/

Math
it's B?

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?

math
Yes thanks! I got sqrt10/2 also!!

math
I did the theorem and got 16/√10 ?

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!

Math
so would 2. be C as well?

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 ...

Math
thanks

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?

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?

spelling
thank you

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

thought so, thanks!

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?

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...?

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?

French 1
oui, merci

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??

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

grammar
I was marked incorrect for using the. Any ideas?

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.

grammar
thank you.

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

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?

french
merci beaucoup!

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

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 ...

french
merci!

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....?

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?

french
merci!

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?

French 1
yes very true! Merci!

French 1
So 1 is A and 2 is A?

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?

French 1
merci beaucoup!

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?

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)

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

English- Medieval Period
it should say all of the above for D So it is D then?

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.... ???

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

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/...

Physics
yes, 0.45 T thanks for checking!

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 ...???

physics
thought so, thanks

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 ...

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

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 ...

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 ...

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 ...

Physics!!
thanks

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 ...

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 ____ ...

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. ...

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

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 ...

physics
okay so it's A, A

physics
so 1-a 2- b

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

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

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....

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 ...

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

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?

Physics
thought so, thanks

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 ...

french
to have

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

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

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...

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 ...

Check for mistakes plz
no problem (:

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!

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