# Posts by Em

Total # Posts: 282

**History**

Try to be less hostile, Sue. Jeez.

**English**

The importance of being earnest play please help me 20. Briefly explain two ways the play is either reflective of the Victorian culture or shows the influence of Restoration comedy. Respond in complete sentences. 21. Identify and explain how symbolism is used in the play. ...

**Econ**

If the rate of inflation is 4% per year, how long will it take for prices to double?

**math **

the flight path of a firework is modelled by the function h(t)=-5(t-5)^2+127

**history**

need answers fast!!!!!!What impact did norbert Rilliexus invention have on sugar industries?

**American Government**

There is another similar version of the test. 1. B. government corporations 2, 3, and 4 are the same as above. 5. C. Preside over the senate 6 & 7 are the same as above. 8. D. International Cooperation and the rest are the same as above

**Math**

Write a divison equation that has a solution of -20

**US Govt**

It also comes up as D sometimes. But it is still whether a person born outside of the US is a "natural born citizen"

**Physics trajectory**

A ball rolls off a deck at a speed of 0.7 m/s. The deck is 4.5m above the street. How long does it take for the ball to reach the street?

**Math**

Let n be any counting number. Using the two questions above as a guide, how many subsets does the set {1,2,3,...,n−1,n} have? Prove it as well. First question:Including itself, how many subsets does the set {1, 2, 3} have? List them. Second Question: Including itself, ...

**Math**

in a survey, 15 people said they played basketball, hockey and volleyball. in addition 20 people said they played basketball and hockey. draw a venn diagram to determine how many people in the survey said they played only basketball and hockey.

**Physics**

If it takes 5 seconds for the baseball to fall, how far from the tower will it land? I used vertical distance formula dy=1/2(g)t^2 and got 122.5 but its one of the answers in the multiple choice. Please help.

**Pre alg**

Simplify: 3x^2+6-2x+5x-4x^2+9 A.-x^2+3x+15 B.7x^2+3x+3 C.x^2-3x+15 D.-x^2+7x+15 I think it's D.

**pre-calculus**

Rewrite the following expression as an algebraic function of x sin(arccos(x/2)) I know sine is y, which is opposite over hypotenuse. I also know that arccos is the inverse of cosine. I'm confused on what the question is asking and what to do with the x. Please help! Thanks

**Geometry**

i have no idea

**Physics**

A block of mass 0.585 kg is placed on the end of a spring which has a stiffness of 294 N/m. It is pulled down 2.80 cm and released. What is the frequency of oscillation?

**Physics**

A block with a mass of 0.357 kg is attached to a spring of spring constant 599 N/m. It is sitting at equilibrium. You then pull the block down 4.80 cm from equilibrium and let go. What is the amplitude of the oscillation? I know A=D/F... I keep getting the wrong answer though...

**Chemistry**

At a certain temperature, the reaction has Kc = 5 x 108. If a reaction mixture at equilibrium contains 0.26 M of H2 and 0.087 M of Cl2, what is the concentration of HCl?

**Physics**

Suppose under the certain conditions, the maximum force of friction that could act on a certain car was 3.35*10^3 N. The mass of the car is 857kg. What is the maximum possible centripetal acceleration of the car going around a bend? I know the equation for this is a=(4piR)/(T^...

**Physics**

A car is traveling around a bend at a speed of 12.4 m/s. The bend has a radius of curvature of 66.7 m. Friction is the only force acting towards the center of the circle. If the mass of the car is 862 kg, what is the force of friction required to make the car go around the bend?

**Physics**

A ball is attached to a center post by a string that is 0.382 m long. The ball is moving in a circle on a frictionless table top at a speed of 1.28 m/s with a radius of 0.382 m. What is the centripetal acceleration of the ball?

**Physics**

If the angular velocity, ω, changes from 7.07 rad/s to 24.2 rad/s over a time of 6.42 s, what is the angular acceleration, α?

**Physics**

If a wheel turns around 6.00 complete rotations, what would the angular displacement of that wheel be in radians?

**Physics**

Suppose a 300–g kookaburra (a large kingfisher bird) picks up a 84.0–g snake and raises it 2.30 m from the ground to a branch. How much work did the bird do on the snake? How much work did it do to raise its own center of mass to the branch? I got the first question ...

**Physics**

Suppose a 300–g kookaburra (a large kingfisher bird) picks up a 84.0–g snake and raises it 2.30 m from the ground to a branch. How much work did the bird do on the snake? How much work did it do to raise its own center of mass to the branch?

**CALC HELP!**

Find an equation of the tangent line to the graph of y= x+ (4/x) at the point (4,5). I can't figure out the answer to this. It's supposed to be y=3/4x +2 but I can't get that.

**Science**

So it's D?

**Science**

1. Which of the following explains why sunlight is important to the aquatic ecosystems? A. Sunlight provides a source of heat and energy to increase water temperatures. B. Sunlight keeps harmful bacteria from taking over aquatic ecosystems. C. Sunlight makes it possible for ...

**CHEM QUESTION**

In writing and balancing equations using sulfur chemists usually use the empirical formula, S, rather than the molecular formula. Why? I'm not sure how to answer this question.

**Math!**

I'm sorry I don't really understand... :(

**Math!**

Describe how you would estimate the square root of a number that is not a perfect square without using a calculator. Can someone please explain? I need some help.

**U.S. History**

At least someone helped.. Thanks, Brighton. Everyone else was no bloody help.

**Math**

If city AN city BR 175 miles apart on a map the distance between the two towns is 2.5 inches what is the scale of the map

**CHEM HELP PLEASE**

would it be 1.05E^-8?

**CHEM HELP PLEASE**

I did a lab where I had to determine avogadro's number. I need to find the uncertainty in number of moles of stearic acid. There were 3 trials and these are the values for the # of moles of stearic acid used for each trial: 4.39E^-7 4.60E^-7 4.50E^-7 I just need help ...

**Math**

lease help idk this answer

**Calculus**

Does anyone know how to solve, ln((3x-2)/(x-1))<0

**Calculus**

Could someone help with this limit problem? lim x-->1 of ((sqrt(6-x))-2)/((sqrt(10-x)-3)) I tried to rationalize the denominator and numerator but it didn't work!

**Calculus**

Could someone help with this limit problem? lim x-->1 of ((sqrt(6-x))-2)/((sqrt(10-x)-3)) I tried to rationalize the denominator and numerator but it didn't work!

**math**

A picture is 42 cm by 36 cm. A scale diagram of the picture must fit in a space that is 3 m by 2 m. Write a reasonable scale for the scale diagram.

**calculus**

Find a cubic polynomial such as f(x)=ax^3+bx^2+cx+d that has horizontal tangents at the points (-5,4) and (4,-4)

**adv functions urgent**

any math teachers around?

**Math- simple polynomials**

For 13 it's 1 and 14 a 1/27

**Math**

Find the area of a triangle on a spherical surface that has a radius of 3cm and angles that measure 75degrees, 160 degrees, and 142 degrees.

**Math**

Find the length of the side of a right triangle side a is 40 mm the opposite is 41 mm

**Math**

How much glas is needed to make a fish tank that is 12 inches long, 8 inches wide, and 9 inches high? The tank is open on top.

**Math**

If 2.7m of ribbon costs $4.99 how much does 0.82m of ribbon cost?

**Chem**

Pure gold adopts a face-centered cubic crystal structure. It also has a density of 19.30g/mL. What is the edge length of gold's unit cell? What is the atomic radius of gold? I understand how to do this problem the other way: when you have the unit cell and are looking for ...

**math -ans check**

two points on the graph of a linear function are (-3,5) and (-1,4). Determine the equation of the function in slop-point form. ans: m=-1/2 I pick a point (-1,4) y-y1=m(x-x1) y-4=-1/2(x-(-1)) y-4=-1/2(x+1) Thank you ^^

**chem**

Calculate glucose levels using standard curve when you have absorbence for sample

**biochem**

How would I calculate blood glucose levels if using standard curve ...and I have three samples and their absorbence at 420 nm.

**Physical Science**

Answer anyone?

**Math**

Bud and frank were playing a game together and together they scored 56 points. Buds score was 8 times higher than franks what are their scores

**Math**

Thanks so much!

**Math**

Heidi has 40 flower arrangemts. Rose arrangements are 4 times as many as tulips how many of each do I have

**Physics**

Your friend Josh tells you that he spends less on gas in the winter than in the summer. He also says that he has to fill up his tank less often in the winter. (a) Which of the following are possible hypotheses that can be formed from Josh’s observations? (You can choose ...

**math**

The answer that I got was 22 because 8+10=18 and 18+22= 40

**Chemistry - Electroplating - URGENT**

Sorry that should say 1115433.526 coulombs, not 8346.453.

**Chemistry - Electroplating - URGENT**

Ahh thank you - so then there would be 8346.453 coulombs needed instead of 2225.721. As there are two unknowns, I cannot solve this problem any further... this is for an assignment due tomorrow, what should I do?

**Chemistry - Electroplating - URGENT**

"To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. Determine how much time a standard bumper should be immersed in a chromium vat." This is what I have so far- 96,485 coulombs are required to plate 1 Cr; 52/6 = 8....

**math**

there are 30 marbles in a bag; 4 blue, 10 red,6 white, 10 yellow. You randomly draw5 marbles without replacement. Find the percent of drawing 2 red marbles and at least 2 white marbles.

**Biology**

Here are the answers to only the question asked 14. dermis 15. chemical 16. urine 17. viruses 18. antibodes 19. gas

**English**

What is wrong with Ms. Sue? Holy crap. She is NOT helpful.

**English**

What are some good insight questions for A Separate Peace? Some topics can include: Wroter's craft Setting POV

**algebra 2**

x^2 - 3x + 5 = 0. solve using quadratic formula. show solution

**GPA**

Currently, my GPA is a 3.5 and I'm a freshman, I'm currently taking two honors classes. Do you think I'll be able to raise it up to a 4.0 by senior year?

**algebra 1**

The graph models the situation because when you plug in -40 for x, you get y=14, which is a point on the graph. When you substitute 40 in for x, y=10, which is also plotted on the graph.

**economics**

Suppose the demand curve for a monopolist is QD = 500 − P, and the marginal revenue function is MR = 500 − 2Q. The monopolist has a constant marginal and average total cost of $50 per unit. a.Find the monopolist’s profit-maximizing output and price. ...

**physics**

Your town is installing a fountain in the main square. If the water is to rise 20 m above the fountain, how much pressure must the water have as it moves slowly toward the nozzle that sprays it up into the air? Assume atmospheric pressure equal to 100,000 Pa.

**physics**

If you fill a container with air at room temperature (400 K), seal the container, and then heat the container to 500 K, what will the pressure be inside the container? Assume atmospheric pressure equal to 100,000 Pa.

**Chemistry**

A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the following figure. When the gas undergoes a particular chemical reaction, it absorbs 827 J of heat from its surroundings and has 0.62 kJ of P−V work done on it by its surroundings.

**chemistry**

What volume of 0.140 M HCl is needed to neutralize 2.53g of Mg(OH)_2

**biology**

I need to know how egg whites would react when tested in iodine and Benedict's solution.

**Government**

Looking for an issue and a solution where the people and the government can help

**Math**

40% of what is 32?

**Math**

laura can paint a house in 4 hours and lucky can paint a house in 2 hours. How long would it take for Laura and Lucky to paint a house together?

**Organic Chemistry**

How do I make an IR Spectrum of C6H12S2 (Allyl Propyl Disulfide)

**Grammar**

Hi beautiful people! Quick question if you are writing a congratulatory letter should you say - I would like to take the time to congratulate you on your extraordinary commitment to XXX charity. OR - I would like to tak ethe time to congratulate you for your extraordinary ...

**math**

so I am wrong, thank you for explaining which it can not be. Thanks

**math**

Which of the following is a formula for finding the volume of a cube? A. v=e^3, where e= the edge length B. v=(lwh)^3, wherel= length,w=width andh=height C.v=6e^2, where e=the edge length D. v=b*b, where b= the area of the base I picked A since V=s^3 or e^3 for the volume of a...

**maths-linear equation**

(4,3),(-1,6)

**Calculus**

With is the integral of (9(sinx+cosx))/sin(2x)

**english**

what would a thesis statement be for Old Jules by Mari Sandoz

**English I**

Can someone please help me with this analogy? Joints:inflamed::_______atrophy. It is a crossword and there are 7 spaces. Thanks!

**Chem**

when 2.31 moles of sulfur hexafluoride are synthesized from te elements, how many grams of fluorine were used PLEASEEEEE HELPPPP MEEE!

**Math**

Given that f(x) = 2x^2 - 8x + 9, 0 ≤ x ≤ 3. (a) Find the average value of f. (b) Find c such that f(average) = f(c).

**Math**

Find the volume generated if the region bounded by y = sin 2x and y = cos x, π/6 ≤ x ≤ π/2 is revolved about the line y = 2. Use the method of washers.

**Math**

Find the volume generated. The region is bounded by y = 4x-x^2 and y = 8x-2x^2, and is rotated about x = 2. State which method (washer, disk, cylindrical shell) is used

**math**

Find the area of the region between the curves y = sin x and y = x^2 - x, 0 ≤ x ≤ 2.

**pre-algebra**

You split $1500 between two savings accounts. Account A pays annual 5% interest and Account B pays 4% annual interest. After one year,you have earned a total of $69.50 in interest. How much money did you invest in each account?

**Math**

Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line. y = 8 sin x, y = 8 cos x, 0 ≤ x ≤ π/4; about y = −1

**Math**

The region bounded by the given curves is rotated about the specified axis. Find the volume V of the resulting solid by any method. x = (y − 6)^2, x = 1; about y = 5

**Math**

Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line. y = (64 − x^2)^(1/4), y = 0, x = 6, x = 7; about the x-axis

**Math**

Find the volume V of the described solid S. The base of S is a circular disk with radius 4r. Parallel cross-sections perpendicular to the base are squares.

**Math**

The region bounded by the given curves is rotated about the specified axis. Find the volume V of the resulting solid by any method. y = −x^2 + 14x − 45, y = 0; about the x-axis

**Math**

Translate and simplify "six less than twice the sum Of a number and three. I was not sure how to set it up Is it 2(x+3)-6 Or would it be set up 2x+3-6 I can solve it once I know how to set up the equation. Confused. Thanks for your help

**Finite Math-Probability**

Suppose we have an urn with 10 white balls and 6 red balls, and we create an experiment by randomly selecting 6 balls from the urn. a) What is the probability that the sample has the same number of white balls as red balls? b) What is the probability that there are more red ...

**Precal**

Find the exact values of tangent and cosecant for angle theta in standard position whose terminal side passes through the point (16,-4)

**Math (Calculus)**

I'm pretty sure that you have to either find the angular or linear speed. That's as much as I could tell you. I'm sorry. Could you possibly help me with my question? It's on the current questions page.