# Posts by Sophie

Total # Posts: 478

**College Physics**

A mass of 50.0 kg is acted on by only two forces: Force 1 is 650 N to the right, and Force 2 is 520 N to the left. What is the acceleration of the mass in response to these forces?

**biology**

in need of journal articles that talk about the structures,characteristics , nutrition,growth and control of bacterias,viruses and eukarya in general...please help

**Math**

Find the exact value of the trig function below. cos2Ø if sinØ = 2/5

**math**

A restaurant offers a lunch special where you can choose any 3 of a total of 9 dishes. How many different combinations are possible?

**MATH**

You need to move all your belongings to your new location. Your company has provided you with three options for your move: DISTNACE: 34 h (3,727.9 km) For your calculations, use an average fuel price of $1.05/L. The fuel consumption rating for your personal vehicle is 7.9 L/...

**Math - Related Rates**

Air is being pumped into a spherical balloon at a rate of 2 cubic meters per minute. At what rate is the radius changing when the volume of the balloon is 36pi cubic meters?

**BIOLOGY**

1. what are the differences between white blood cells and antibodies? 2.why is HIV not detected immediately as foreign material once it enters our blood stream or white blood cells? 3.what is the enzyme used by HIV to convert RNA to DNA?

**Algebra**

You need to rent a moving truck for two days. Rider Moving Trucks charges $50 per day and $.50 per mile. UMove Trucks charges $45 per day and $0.75 per mile. Write an equation describing each situation. Graph them on the same xy axis. You only need Quadrant I because all ...

**biology**

thank you very much

**biology**

a. what are the composition in nutrient broth? b. give 5 different types of media used for cultivation of microbes and define each?

**chemistry please help**

thank you very much

**chemistry please help**

i. only one location of the substituent is represented on the name. ii.i disagree on this one i think the correct name here is 2-methylhexane because the longest chain is 6 carbons long not 5 carbons iii.the parent chain is numbered incorrectly

**chemistry please help**

what is wrong with these names?provide the correct name for each. i.2-Dimethylpentane {4] ii.2-Ethylpentane {4} iii.5,5-Dimethyl-3-ethylhexane {4]

**Math**

Four subtracted from 3 times a number is 29. Find the number

**English **

It doesn't make me really happy. - okay It doesn't make me real happiness? - wrong It doesn't give me real happiness. - okay Why I need to use give on the third sentence and not make to make my sentence correct? Both make and give are verb...but why give?

**Math**

For xyz manufacturing the fixed costs are $1200, material and labor costs combined are $2 per unit, and the demand equation is: p=100/?q What level of output will maximize profit? Show this occurs when marginal revenue equals marginal cost. What is the price at the profit ...

**MICRO ECONOMICS**

MC= TC - TC(one less) TC= AVC*Q

**English**

Pick a character. Talk about it and why you picked it.

**Math**

For xyz manufacturing the fixed costs are $1200, material and labor costs combined are $2 per unit, and the demand equation is: p=100/?q What level of output will maximize profit? Show this occurs when marginal revenue equals marginal cost. What is the price at the profit ...

**Math**

I have spent a month trying to figure this out.. Thank you. You have saved my life.

**Math**

The supply function for a product is 2p-q-10=0, while the the demand function for the same product is (p+10)(q+30) = 7200. Find the market equilibrium point. .. I think q=656.6667 and p= 333.33335 I think D must = S... but I don't know how do do that. Help?

**Business Math**

If $4000 is deposited at the end of each year in an account that earns 6.2% compounded semiannually, how long will it be before the account contains $120,000?

**Science**

D)The blood of the vessels near the small intestine is often acidic after a meal. suggest a reason for this.

**math**

Inverse of h(x)=7-9cos(-(x+1)). h^-1(x)=? show work please! Thanks.. also accidentally put this as an answer somewhere pls ignore that!

**math**

Inverse of h(x)=7-9cos(-(x+1)). h^-1(x)=? show work please! Thanks!

**AP CHEM**

A bar of strontium metal is immersed in a 1.0 M copper(ll) nitrate solution. write the net ionic. I have the molecular formula written out but im not sure how to write the net ionic for this single displacement reaction

**math work**

evaluate the expression ( 94 93) please help with this! I don't know what to do! ps there is a big bracket that is around the 94 and the 93, i just couldn't enter that into the box.

**math work**

find the triple scalar product u . (v * w) for the vectors u = 9i - 7j - 3k v = -6i + j - 5k w = 2i + 8j - 9k

**math work**

determine whether the planes are parallel, octagonal or neither a. 4x + 5y + z = -1 3x + 5y - 37z = -3 b. 2x - y - 3z = -5 -2x - 6y - z = 3

**math work**

find the minors and cofactors of the matrix [ -3 2 -8 ] 3 -2 6 -1 3 -6

**math please help?! studying for test!!**

If x = 9tanθ, use trigonometric substitution to write square root 81 + x^2 as a trigonometric function of θ, where -pi/2 < θ < pi/2

**math help?!**

If x = 6sinθ, use trigonometric substitution to write square root 36-x^2 as a trigonometric function of θ, where where 0<θ< pi/2

**Physics**

A plane wants to fly east. It is capable of flying at 250 m/s, yet a 50 m/s wind is blowing [SW]. What heading must the plane set and what will be the plane's speed relative to the ground?

**calc**

im confused on how you got 8 for the second problem. may you please explain?

**calc**

given that ln2=0.7 and ln5=1.6, find: 1) ln(1/25) 2) e^3ln2 - ln5

**Math**

it would take about 39,682 days

**Language Arts**

Thanks

**Language Arts**

If there is a SMATTERING of applause at the end of a play, what do you hear? A. just a few people clapping** B. total silence C. half the audience cheering D. everyone clapping loudly

**Physics**

The near and the far points of a short-sighted are 8 cm and 20 cm from the eyeball. a) What power of corrective lens is needed for this eye to see distant objects clearly? b)What will the resulting near point then be?(Assume that the lens is placed very close to the eye) ...

**Physics**

A decibel meter reads 130 dB at a certain position from a jet plane when one engine is turned on. a) What is the sound intensity at that position? b) What would be the sound level at the same position if two engines are turned on each having the same intensity as the first? ...

**Engineering**

A perfect coin should produce heads and tails with equal probability. If we assign the number 0 toheads and the number 1 to tails, then we can mimic such a perfect coin in Matlab. Specifically, we cangenerate N “coin flips” in Matlab by doing x= (rand(N, 1) < 0.5...

**Calculus**

Just wondering if anyone can help with this ln question! -Solve the following ln(x+1)+ln(x-1)=2 thanks!!

**pigskin**

packers cowboys

**Language**

Please i will die if you don't give me answer! !!!!:-( :-( :-( :'( :'( :'( :'( Please

**Language**

And you have to choose between this words : Baby_sitter Breakthrough Copyright Earthquake Expressway forehead Keyboeard Loudspeaker Near-sighted Ourselves Part-time Shoplifting Volleyball Worthwhile Wristwatch Bruis Nuisance Pursuit Seized Straight

**Language**

I don't have imagination PLEASE help me on this i'm so tired!!!! :'( :'( I'm stupid in language!

**Language**

Complite the sentences. A) We headed east on 89 until we crossed the _____ bridge. B) The_____ tournament was being held this year at Morgan secondary school. C) It looked like I would miss my _____ job since i wouldn't get home until after eight. D) Ehen i glanced at the ...

**Language**

Sorry to bother you again but i can not find it for tower and phone

**Language**

Thank you i will try to do them by myself.thanks again!

**Language**

I am not sute but this is on compound words unit so i think that's right thank you so much and can you please see if you can find the answers for puzzle # 2? Thanks

**Language**

I really need this answer right now!!!

**Language**

Try to sokve this compound puzze. A)(puzzle #1) Cook= book Volley= Express= Fore= Wrist= Loud= Key= B)(puzzle #2) Case= Park= Side= Stone= Tower= Phone= Walk=

**math, physics**

A motorboat goes upstream on a river and covers the distance between two towns on the riverbank in 6 hours. It covers this distance downstream in 5 hours. If the speed of the stream is 1.5 km/h, find the speed of the boat in still water. [This problem is challenging.

**math**

thank you :)

**math**

both jamie and her brother david were born on the same day but david was born three years before jamie how can you represent the relationship between james and david's ages in a table,graph, and equation

**factors**

1 2 4 or 8

**maths**

If it takes 10 men to build a house in 6 months how many would be needed to build it in 4 months

**ENGLISH**

Why correct or proper use of abbreviations and symbols important in writing?

**ENGLISH**

why correct pronouns important in writing?

**maths**

How do I draw a 64 degree angle in between a 6cm by 5cm triangle please

**Math**

Thanks so much!

**Math**

A flowerbed is 3 3/4 meters long and 2 meters wide. Uncle James wants to build a border around the flowerbed. The width of the border is 1/2 meter. The cost of building the border is $20 per square meter. How much does Uncle James have to pay to have the border built.

**Math**

Puppy A is 3/4 as heavy as puppy B. Puppy C is twice as heavy as puppy A. If the weight of puppy B is 8 pounds, find the weight of puppy C.

**Math**

Lily uses 1 3/4 of ribbon to make a knot. She wants to make 9 similar knots for her cousins. How many meters of ribbon does Lily need? Round your answer to the nearest meter.

**Math**

Thank you! You make a difference in my life!

**Math**

The Smith family drinks 1 4/5 liters of apple juice each day. The apple juice is packed in 2-liter bottles. How many bottles does Mrs. Smith need to buy every week?

**english**

It's a...?

**english**

17. Identify the choice that correctly completes the sentence: Neither Kurt nor Sue has turned in _______ permission form. their his or her his they're

**Chemistry**

The ph of a solution is 9.55 at 25degree celcius. What is the hydroxide-ion in the solution?

**Language Arts**

Okay thank u Ms.Sue and are u a real techer

**Language Arts**

where do you look up context clues to the meaning of a word

**Finance**

you have to replace a copy machine and you have 2 offers. both offers 3 year leases. offer 1 requires an up-front payment of $1700 with additional payments of $1200 at the beginning of years 2 and 3. The firm is also charged one-half of 1 cent, ($0.005), for each sheet printed...

**art**

Its c

**math**

q=39 r =$41

**Art**

Are you sure its A?

**Health**

Is it 2?

**Foreign Language**

Number 2 and 4 are wrong.

**Thermodynamic**

The equilibrium constant of a reaction is determined at 2 different temperatures: at -181°C, Keq = 2770 at -11°C, Keq = 640

**Algebra**

The REAL answer is 2.1 because if you add 3.5+2= 3.7 then you subtract 3.7-6=2.1

**Math**

He uses 12 bananas, 9 apples, and 18 pears

**relativity**

A runs at speed 4c=5 toward B, who is at rest. C is between A and B. How fast should C run so that she sees both A and B approaching her at the same speed? i have tried this but not sure we have to use relativity i thing. else without that i solved and got 2c/5.

**Biology**

How do proteins leave the cell?

**Geometry**

The measure of an exterior angle of a regular polugon is given. Find the measure of an interior angle. Then find the number of sides. 1) The measure of the exterior angle is x.

**CHemistry**

Assuming the final concentration of chloride anion after the addition of HCl (precipitation step) was 0.1M, what is the remaining concentration of Ag+ in the solution? (pKsp for AgCl = 9.74)

**Physics**

a) An electron in an atom has a speed of 2.2 × 10^6 m/s and orbits the nucleus at a distance of 5 × 10^-11m. What is its centripetal acceleration? (already solved) 9.68x 10^22 m/s^2 b) A neutron star of radius 17 km is found to rotate at 5 revolutions per second. ...

**Physics HELP**

A ball is thrown horizontally at 15 m/s from a clifftop 60 m above the sea level. Find: a) the time to land; b) the angle at which it hits the water; ° below the horizontal c) the speed at which it hits the water.

**chemistry**

A sample of gas occupies 17mL at -112 degrees Celsius. Assuming the pressure is held constant, what volume does the sample occupy at 70 degrees Celsius?

**Physics**

A ball is thrown at 15.5 m/s at 42° above the horizontal. Someone located 30 m away along the line3 of the path starts to run just as the ball is thrown. How fast, and in which direction, must the catcher run to catch the ball at the level from which it was thrown?

**Math**

If 1/3 is equal to 2/6 how come my teacher says it is equal to 5/8?

**Pre-Algebra**

9/10 0r 0.9

**Physics**

I push a stack of six books (each weighting 4 kg) horizontally across a table to the right with a kinetic coefficient of friction uk = 0.5. I apply a force of 120 N. a) What is the acceleration of the books? b) what is the force of the rightmost book on its neighbor? Next, I ...

**PHYSICS**

So you know what the value for pi is, value for r is, and the value for V. So the only part is looking for h. You can achieve that by just manipulating the equation: V=pi(r^2)(h) into h=... V= pi*r^2*h V/ pi = r^2*h V/(pi*r^2) = h Then when you get the equation for h, you can ...

**Physics**

Do Newton's Law apply to motion inside your car? A.Yes, but only when at rest. B.Yes, but only when traveling at constant velocity or at rest. C.No, never. D.Yes, always. So I tried answering the question with D at first because I was thinking that it is a car in motion so...

**Chemistry**

Write the formula for a complex formed between Ni 2+ and NH3, with a coordination number of 5. Write the formula for a complex formed between Ni 2+ and CN–, with a coordination number of 4. I am having trouble with these problem because I don't really understand what ...

**Chemistry**

Consider a fuel cell that uses the reaction of ethanol with oxygen to produce electricity, CH3CH20H(l)+ 3O2(g)---> 2CO2(g)+3H2O Use thermodynamic data to determine the value of E°cell for this cell at 25 °C. I don't really know where to start. I got the standard...

**Chemistry**

Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Zn2 ] = 0.842 M and [Ni2 ] = 0.0100 M. Standard reduction potentials can be found here. reaction: Zn(s)+Ni^2+(aq)--->Zn^2+(aq)+Ni(s) standard reduction Zn: -.76 standard ...

**Chemistry**

separate this redox reaction into its component half-reactions. O2 + 4Cu-->2CuO Oxidation half-reaction: ? Reduction half-reaction: ? I believe that the Oxidation is copper and that reduction is oxygen. So I tried to write it as 4Cu^+ --> 4Cu + 4e^- O2^2- +4e^- ---> ...

**chemistry**

Where possible, classify these systems as reactant-favored or product-favored at 298 K. If the direction cannot be determined from the information given, classify the reaction as "Insufficient information". a)2A(g) + 3B(g) -->4C(g) delta H = -95kJ b)2A(g) + 2B(g...

**Maths**

write a directed number to show the size and direction of the number. Question john walked 10km east

**Math 2**

The answer is 5, because the factors of 36=1,2,3,4,6,9,12,18,36. You can pair these up in 2's to get the Lengths and the widths. Then you would put 10 as the height to make all the products into 360.