# Helen

Most popular questions and responses by Helen-
## physics

A droplet of ink in an industrial ink-jet printer carries a charge of 1.1×10−10 C and is deflected onto paper by a force of 3.7×10−4 N.Find the strength of the electric field to produce this force.

*asked on April 14, 2012* -
## finance

Suppose an investment offers to triple your money in 36 months (don’t believe it). What rate of return per quarter are you being offered

*asked on October 17, 2014* -
## algebra

During a manufacturing process, a metal part in a machine is exposed to varying temperature conditions. The manufacturer of the machine recommends that the temperature of the machine part remain below 141°F. The temperature T in degrees Fahrenheit x

*asked on December 18, 2013* -
## English

9. Read these line, from The Passionate Shepherd to his love. "The country swains shall dance and sing/For they delight each May morning.?If these delights thy mind may move,/Then live with me, and be my love." What sort of life is the shepherd offering

*asked on December 17, 2013* -
## Chemistry

An airplane is pressurized to 650mm Hg, which is the atmospheric pressure at a ski resort at 13,000ft altitude. a. if air is 21% oxygen, what is the partial pressure of oxygen on the plane? b. If the partial pressure of oxygen drops below 100mm Hg,

*asked on May 15, 2010* -
## Grammar

Label each sentence below as simple, compound, complex, or compound-complex. 1. You can enter the data, or you can interview the candidates. (compound) 2. No one knew the man, and no one asked his name. (compound) 3. After the officer pulled Tim over, Tim

*asked on December 16, 2015* -
## English

Words to choose from: Commemorate, complacent, consensus, deplete, diligent, empathy, menial, niche, transcend, and waive At Eastman High School reunions, the conversation usually gets around to the question “who was our best teacher?” And year after

*asked on July 3, 2014* -
## Language Arts

1.)Knowing that the Latin root -equi- means "equal," choose the best meaning for the word equilateral as it is used in the sentence below. The box appears to be square, but I would have to measure its sides to prove that it is equilateral. A. equally

*asked on November 28, 2016* -
## help please English

If this be error and upon me proved/ I nevered writ, nor no man ever loved." What is the impact of these concluding lines from shakespeare's sonnet 116? 1. They underscore the fact that everyone makes mistakes 2. They underscore the fat that shakespeare is

*asked on December 21, 2013* -
## help please English

If this be error and upon me proved/ I nevered writ, nor no man ever loved." What is the impact of these concluding lines from shakespeare's sonnet 116? 1. They underscore the fact that everyone makes mistakes 2. They underscore the fat that shakespeare is

*asked on December 22, 2013* -
## Chemistry

For the list of chemicals below, write complete, balanced equations for all possible reactions that would lead to an insoluble salt. KCl, BaCl2, AgNO3, Pb(No3)2, K2SO4, HNO3

*asked on November 2, 2011* -
## chemistry

Freezing and Melting are two different physical changes that involve the same amount of energy. compare and contrast the potential energy diagrams that would represent each of these processes. Be specific in your comparison.

*asked on March 31, 2014* -
## Geometry

A grid shows the positions of a subway stop and your house. The subway stop is located at (-5,2) and your house is located at (-9,9). What is the distance, to the nearest tenth unit between your house and the stop?

*asked on March 14, 2012* -
## algebra

An initial population of 298 quail increases at an annual rate of 8%. Write an exponential function to model the quail population. What will the approximate population be after 3 years f(x)=298(1.08)^x;375 f(x)=298(0.08)^x;153 f(x)=298(8)^x;305

*asked on January 12, 2014* -
## physics

Suppose the amount of heat removed when 3.0kg of water freezes at 0 degree C were removed from ethyl alcohol and its freezing/melting point of -114 degree C. How many kilograms of ethyl alcohol would freeze? PLEASE GIVE ME SOME HINTS!!!THANKS A LOT!!!!

*asked on February 10, 2008* -
## statistic

For each of the following, assume you are working with a standard deck of 52 cards. There are 13 cards (2,3,4,5,6,7,8,9,10, jack, queen, king and Ace) in each of four suits (Clubs, Diamonds, Hearts, and Spades). a. What is P(Club) when drawing one card? b.

*asked on March 13, 2014* -
## Geometry

Find the length of d in simplest radical form of he diagonal of a cube with sides of s units.

*asked on March 14, 2012* -
## English

9. Read these line, from The Passionate Shepherd to his love. "The country swains shall dance and sing/For they delight each May morning.?If these delights thy mind may move,/Then live with me, and be my love." What sort of life is the shepherd offering

*asked on December 20, 2013* -
## Physics

A 71 kg skydiver jumps out of a plane at an altitude of 1370m. She reaches terminal velocity of 68m/s. She opens the parachute at an altitude of 328m, and lands with a speed of 2.8m/s. a)How much (negative) work is done by air resistance before she opens

*asked on February 20, 2017* -
## Math

The table shows how many hours Catalina spent babysitting during the months of April and May. a. If Catalina charges $6.50 per hour, what is the percent of change in the amount of money earned from April to May? Is it a change of increase of decrease? b.

*asked on December 5, 2015* -
## Chemistry

The heat capacity of lead is 0.13 J/g•°C. How many joules of heat would be required to raise the temperature of 15 g of lead from 22°C to 37°C?

*asked on September 17, 2012* -
## algebra

An exam consists of two parts, Section X and Section Y. There can be a maximum of 95 questions. There must be at least 20 more questions in Section Y than in Section X. Write a system of inequalities to model the number of questions in each of the two

*asked on January 11, 2014* -
## algebra

simplify the expression -5+i/2i

*asked on December 19, 2013* -
## math

Valerie and Bret have a total of 24 dog show ribbons.Bret has twice as many ribbons as Valerie.How many ribbons does each have?

*asked on October 6, 2014* -
## Math

he wholesale cost of a delivery van is $31,300. The original markup was 26% based on selling price. Find the final sale price after the following series of price changes: a markup of 46%, a markup of 15%, a markdown of 40%, and a markup of 14%. (Round each

*asked on August 2, 2017* -
## math

You want to determine the height of your school. The building casts a 6 foot shadow at the same time you cast a 15 inch shadow. If you are 5 feet tall how tall is the building?

*asked on February 23, 2012* -
## Physics

A bowling ball of mass M and radius R is thrown along a level surface so that initially ( t= 0) it slides with a linear speed but does not rotate, see the figure. As it slides, it begins to spin, and eventually rolls without slipping. How far has the ball

*asked on December 4, 2011* -
## Statistic ASAP Please

Some people believe in the force (yes, like in Star Wars). To test if young Anakin Skywalker has the force with him, he is told that some cards that Yoda can see but Anakin cannot contain a picture of a planet, a lightsaber, a laser rifle, or a spaceship.

*asked on April 3, 2014* -
## Math

Kimberly is 3 times as old as her sister, Halley .Find the ratio of Kimberley"s age to Hallet"s age. Give your answer in fraction form.

*asked on February 20, 2014* -
## *****Help Statistic

Imagine taking a 10-question true or false exam. You randomly guess at each question. Don't do any calculations, just tell me your first impressions a). Is this a binomial setting? b) How many question do you think you would get correct? c). How surprised

*asked on March 26, 2014* -
## Chemistry

What volume of a 0.5 M solution is required to prepare 250 mL of a 0.15M solution? (Note: M = mole per Litre)

*asked on November 7, 2012* -
## Chemistry

If 6.0 liters of methane react with 12.0 liters of oxygen according to the equation CH4 + 2O2 → CO2 + 2H2O, and the temperature and the pressure are kept constant, which of the following is true? a. All the methane and oxygen react. b. Oxygen is in

*asked on September 21, 2012* -
## physic

A cheetah is crouched in ambush 20m to the east of an observers blind. At time t=0 the cheetah charges an aeroplane in a cleaning 50m east of the observer. The cheetah runs along the straight line.

*asked on February 19, 2014* -
## math

(John worked for 8 weeks and earned $200. If he works five days per week, how much did he earn per day?)

*asked on March 29, 2013* -
## Math

Solve the literal equation for a y=x(ab/a-b)

*asked on October 10, 2013* -
## CHEMISTRY

Give the NAMES and FORMULAS for the following COVALENT (nonmetallic) compounds. 1. Sulfur hexafluoride 2. Tetraphosphorus heptasulfide 3. Silicon tetrachloride 4.Disulfur decafluroine moniodide 5. Iodine pentafluoride 6. Tetranitrogen trisulfide 7.

*asked on February 23, 2012* -
## Physics

1. A steam engine converts 150 kg of water completely to steam. The process involves transfer of 4 x 10^8 J as heat. If steam escaping through the safety valve does 2 x 10^8 J of work against outside atmosphere, the net change in the internal energy is: a.

*asked on December 20, 2015* -
## Algebra

Dasha has 4 times more rose bushes in her garden than Anna. After 39 rose bushes were removed from Dasha's garden and then replanted into Anna's garden, the number of bushes in both gardens became the same. How many rose bushes did Dasha's garden have

*asked on September 26, 2019* -
## check one question statistic

For the scenario below, determine if the experiment describes a geometric distribution. If it is not a geometric setting, state why. if it is a geometric a) the two outcomes head or not head b) What constitutes one trial Flip a coin constitutes a flip coin

*asked on March 31, 2014* -
## math

a man spent 1/4 of his monthly salary on rent ,2/5 on food and 1/6 on books. If he still had ghana 55000 left what was his monthly salary

*asked on June 26, 2016* -
## physics!

Suppose the amplitude and frequency of a transverse wave are, respectively, 1.3cm and 5.0Hz. Find the total vertical distance (in cm) through a fixed point in 3.0s. PLEASE GIVE ME SOME IDEAS TO DO IT!!!THANKS A LOT!!!!!!!

*asked on March 2, 2008* -
## statistic

Many wildlife populations are monitored by taking aerial photographs. Information about the number of animals and their whereabouts is important to protecting certain species and to ensuring the safety of surrounding human populations. In addition, it is

*asked on December 15, 2013* -
## Statistic

consider caleb the basketball player. In a game, he shoots 10 free throws. In the year, he makes 70% of his free throws. Is this a binomial setting? Fully explain your response.

*asked on March 30, 2014* -
## Chemistry

calculate cell potential at 25C for: 3Fe3+(aq) + AL(s)= 3Fe2+(aq)+ Al3+ (aq) if Fe3+ = 0.300 M, Fe2+ = 0.150M Al3+ = 0.300M. The standard reduction potentials are as follows: Fe3+ (aq) + e- = Fe2+ (aq) Al3+ (aq) + 3e-=Al (s) Eo = +0.771 V Eo = -1.66 V

*asked on October 18, 2010* -
## Algebra

Write an equation of the line passing through each of the following pairs of points. (−10, 4), (2, −5)

*asked on October 2, 2019* -
## spanish

1. Voy de vacaciones y primero necesito (conﬁrmar el vuelo / pasar por seguridad) para viajar. 2. Voy a Dallas y luego vuelvo a Miami. Necesito un boleto (de ida y vuelta / de ida). my answers 1. confirmar el vuelvo 2. de ida y vuelta

*asked on September 24, 2012* -
## Algebra

For what value(s) of k will the relation not be a function? A = {(1.5k−4, 7), (−0.5k+8, 15)}

*asked on September 26, 2019* -
## Statistic

In a survey of students at a local high school, 30% of the students said they liked tater tots and 15% of the students said they like French fries. If every one of the students who said they like French fries also said they like tater tots, what proportion

*asked on March 14, 2014* -
## MATH! PLEASE REPLY ASAP!

VWXYZ is a rectangle-based pyramid where WX=66 cm and XY=32cm. The vertex is vertically above the center of the base. Given that the slant heights VA and VB are 56 cm and 63 cm respectively, find the total surface area of the pyramid. Additionally, find

*asked on January 23, 2011* -
## chemistry

Would you use a physical model or a conceptual model to describe the following: a gold coin, dollar bill, car engine, air pollution, virus, spread of sexually transmitted disease?

*asked on March 16, 2011* -
## Algebra

Write an equation of the line passing through each of the following pairs of points. (4, 0), (−2, 8)

*asked on October 2, 2019* -
## Chemistry

A volume of 25.0 ml of 0.100 M CH3C02H is titrated with 0.100 M NaOH. What is pH after the addition of 12.5 ml of NaOH? (Ka for CH3CO2H = 1.8x10-5)

*asked on October 18, 2010* -
## Math

Connor ran around the 1/4-mile track 15 times! Express the distance he ran as a mixed number.

*asked on September 23, 2015* -
## help please statistic

Teenage drivers pay more for automobile insurance than older drivers. Also, many insurance companies offer discounts for teenage drivers that achieve good grades. Assume that 20% of all teenage drivers are involved in accidents each year. Assume that 10%

*asked on March 16, 2014* -
## Calculus 2 - Series

I am so confused on how to do series problems...especially these. How can you tell the pattern and determining the formula for them? Can someone please help? 26) Write the first five terms of the sequence {an} whose nth term is given. an = (n + 3)/(2n −

*asked on March 29, 2015* -
## Chemistry 131

4.0g of an unknown potassium halide (KX, where X is the halide) is dissolved in 100g of water. The solution freezes at -1.28 degrees Celsius. What is the identity of the halide?

*asked on December 2, 2017* -
## Physics

A light, rigid rod 1.039m in length joins two particles with masses 3.65kg and 4.94kg at its ends. The combination rotates in the xy plane about a pivot through the centre of the rod. Determine the angular momentum of the system about the origin when the

*asked on July 5, 2016* -
## Gr.12 data management

There are 52 white keys on a piano. The lowest key is A. The Keys are designated A. B, C, D, E, F, G in succession, and then the sequence of letters repeats, ending with a C for the highest key. A) if five notes are played together simultaneously, in how

*asked on July 8, 2015* -
## Algebra

Write a formula showing the dependence of the mass of a piece of cork on its volume, if the density of cork is 0.18g/cm3. Using the formula, find the volume of a piece of cork with a mass of 64.8g

*asked on September 26, 2019* -
## help ASAP Statistic

The tests done to determine if someone is HIV positive are called Enzyme immunoassay or EIA tests. The test screens a blood sample for the presence of antibodies to HIV. Like most tests, this test is not perfect. The table below shows the approximate

*asked on March 17, 2014* -
## Algebra

Jim and his dad are bricklayers. Jim can lay bricks for a fireplace and chimney in 5 days. With his father's help, he can build it in 2 days. How long would it take his father to build it alone? days hours

*asked on October 9, 2019* -
## Algebra

Write an equation of the line passing through each of the following pairs of points. (5, 0), (−3, 0)

*asked on October 2, 2019* -
## algebra

use the binomial theorem to expand the binomial (s+2v)^5

*asked on January 11, 2014* -
## arithmetic

2. Find the general term and 25th term of the sequences c) 15, 13, 11, 9 ...

*asked on December 7, 2010* -
## Algebra

Find all whole values for y for which the double inequality is true: −5

*asked on October 11, 2019* -
## statistic

Which of the following behave according to a power model? Select all the apply. 1.Finance 2. Population 3. area 4. Pricing 5. volume 6. bacteria 7. mass

*asked on December 13, 2013* -
## Science

What is the difference between overpopulation and Consumption overpopulation? What components would you find in an overall plan for sustuinability?

*asked on October 3, 2012* -
## College Chemistry

What is pH buffer of 0.1 mol L-1 Na2HPO4/O.15 mol L-1 KH2PO4? KH2PO4? Given Ka(H2PO4-) = 6.2 x 10-8). I would like to know the correct formula, steps for the answer Thank you

*asked on October 20, 2010* -
## statistic

A linear model for a set of data was y = –20.6 + 9.72x and produced the following residual plot: [Xscl = 1, Yscl = 5] Scatterplot a) Predict the value of y when x = 7.5. b) Determine the residual if x = 5. (2 points)

*asked on December 15, 2013* -
## algebra

simplify the number using the imaginary unit i. square root of -16

*asked on December 19, 2013* -
## statistic

A study was conducted to determine the effectiveness of varying amounts of vitamin C in reducing the number of common colds. A survey of 450 people provided the following information: Daily amount of vitamin C taken None 500 mg 1000 mg No Colds 57 26 17 At

*asked on December 14, 2013* -
## Math

farmer has 10 trees see if you can plant them so there are 5 rows of trees with 4 trees in each row

*asked on September 24, 2011* -
## college

The approximate vapor pressure of CS2 at 30 degrees Celsius?

*asked on December 13, 2010* -
## Algebra

Find all whole values for y for which the double inequality is true: 28

*asked on October 9, 2019* -
## Composition

We all Crave Horror Movies essay by Stephen King What does King mean in paragraph 4 when he says that horror movies are “innately conservative, even reactionary”? What does he mean in paragraph 11 when he calls them “anarchistic, and

*asked on January 20, 2010* -
## statistic

cientists are studying the population of a particular type to fish. the table below shows the data gathered over-five month time period. use the data to answer question 5-9 months 0,8 fish,month 1-39, month 2-195, month 3-960, month, month 4-4,738, month

*asked on December 22, 2013* -
## chem

How many moles of carbon, hydrogen, and oxygen are present in a 100-g\rm g sample of ascorbic acid?

*asked on July 20, 2014* -
## Statistic

1. For this assessment, explicityly state the five steps of a simulation and carry out the simulation. Use the random digit table. A basketball player makes 80% of her free throws. Recently during a very close game, she shot 5 free throws near the end of

*asked on January 30, 2014* -
## Algebra

What is the domain of the functions below: y= 2x−3/|x-1|+2

*asked on October 9, 2019* -
## statistic****help*****

if three coins are tossed, what is the number of equally likely outcomes? 3 4 6 8 9

*asked on March 19, 2014* -
## College Chemistry

Which is the correct form of equilibrium expression of the following reaction. 2PbS(s)+3O2(g)reverse arrow 2PbOs + 2SO2g Why is the answer Kc= SO2 power 2/O2 power 3 Why in particular is this the arrangement for equilibrium expression? Thank you

*asked on October 21, 2010* -
## Algebra

Given the function y={ 3x+1 if x ≥0 Find its values for x=−1; 0; 1; 2. {x-2 if x

*asked on October 9, 2019* -
## statistic

Which of the following behave exponentially over time? Select all that apply. (6 points) finances population area pricing volume bacteria mass

*asked on December 12, 2013* -
## statistic

You draw one card from a shuffled standard deck or cards (cards are in four suits-red diamonds, red heart, black clubs and black spades-and are numbered 2,3,4,5,6,7,8,9,10, J,O,K,A). A.What is the probability of drawing a red card B.What is the probability

*asked on March 16, 2014* -
## statistic

which is true about the response variable? i this used to be called the dependent variable. ii when graphing the data, the response variable is plotted along the x-axis only I only ii both I and ii neither I or ii

*asked on January 14, 2014* -
## physics

An energy of 6.0×10−2 J is stored in the metal sphere on top of a Van de Graaff generator. A spark carrying 1.0 micro-coulomb (1.0×10−6 C) discharges the sphere.Find the sphere's potential relative to ground. last one for the night

*asked on April 14, 2012* -
## Math

nPr=6720 and nCr=56, then the value if r is___?

*asked on July 8, 2015* -
## physics

A car traveling at 120 strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.90 . What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of "'s," where

*asked on October 1, 2011* -
## Algebra

Given the function f(x)=x2+2x+1, find: f(−7)

*asked on September 24, 2019* -
## statistic

cientists are studying the population of a particular type of fish. The table below shows the data gathered over a five-month time period. Use the data to answer questions 5-9. number of months number of fish 0 8 1 39 2 195 3 960 4 4,738 5 23,375 5. what

*asked on December 26, 2013* -
## physics

an empty rubber balloon has mass 0.0120kg, the balloon is filled with helium of density 0.181 kg/m^3. the balloon is spherical w/ radius 0.500m. if the balloon is ties to a vertical string, what is thw tension in the string? density of air 1.29 kg/m^3

*asked on December 15, 2012* -
## English

What is wrong with this sentence? Although they seemed inflamed, the site of the previous craniectomy seemed free of defect.

*asked on May 19, 2015* -
## help asap statistic

I need someone to check a statistic test can anyone help me. Unit 4 Test Multiple Choice 1. Which choices listed below indicate that a linear model is not the best fit for a dataset? Choose all that apply. (3 points) • Scatterplot shows a strong linear

*asked on January 7, 2014* -
## statistic

Scientists are studying the population of a particular type of fish. The table below shows the data gathered over a five-month time period. Use the data to answer questions 5-9. number of months number of fish 0 8 1 39 2 195 3 960 4 4,738 5 23,375 5. what

*asked on December 28, 2013* -
## Algebra

Given the function f(x)=x2+2x+1, find: f(2b)

*asked on September 28, 2019* -
## Math

A company will make a cereal box with whole number dimensions and a volume of 100 cubic centimeters. If cardboard costs $0.05 per 100 square centimeters, what is the least cost to make 100 boxes? Please help me, I have no clue how to solve.

*asked on April 5, 2016* -
## Algebra

Find the domain of the function expressed by the formula: y= 2 3 +x

*asked on September 22, 2019* -
## chemistry

write the equilibrum constant expression for Kp of the following: a.) O2-->--------< 2PbO(s) + 2SO2(g)

*asked on October 18, 2012* -
## communication

Which of the following is a characteristic of communication in high-context cultures? Written agreements are binding. There is reliance on nonverbal signs to communicate. Oral agreements are not binding. There is a preference for direct communication.

*asked on June 3, 2010* -
## statistic

27. which is true about the response variable? i. this used to be called the independent variable. ii. when graphing the data, the response variable is plotted along the y-axis only i only ii both i and ii neither

*asked on January 14, 2014*