# Ángel

Most popular questions and responses by Ángel-
## Algebra

Justine earned $26,000 during the first year of her job at city hall. After each year she received a 3% raise. Find her total earnings during the first five years on the job.

*asked on April 13, 2016* -
## Math

By default, your numerical entry is scored as correct if it is within 1% of the correct answer. A rule of thumb is always to enter at least 3 digits for numerical questions. If the correct answer is 7.48809, which of the following entries would be counted

*asked on September 28, 2011* -
## Linear Algebra

Let L be the line with parametric equations x = 2+3t y = 3−2t z = 2+t Find the shortest distance d from the point P0=(−5, 1, −4) to L, and the point Q on L that is closest to P0. Use the square root symbol '√' where needed to give an exact value

*asked on November 26, 2017* -
## Math

Yesterday, a parking lot had 60 cars parked in it. Of the cars parked in the parking lot, 40% were silver, 14 were red, and the rest were blue. How many of the cars were blue ( I Picked 6 cars) Answers To Choose:24 cars 38 cars 22 cars or 6 cars

*asked on February 14, 2014* -
## Math

A car travels 172 miles using 7 gallons of gas. At that rate, how far can the car travel using 42 gallons of gas ( i got 1,032 ) answers to choose:1,032 miles 1,548 miles 1,204 miles or 1,376 miles

*asked on February 14, 2014* -
## History

How did John Calhoun react to the Tariff of 1828? A. He used his power as Vice President to influence President Jackson to oppose the tariff. B. He led a charge to impose sticker regulations on the second bank of the United States. C. He devised a force

*asked on August 29, 2017* -
## English

Which are features of myths? Check all that apply. supernatural gods or animals fantastic settings humorous elements that entertain the reader an attempt to explain the origin of the universe characters found in everyday life conflicts between worlds,

*asked on October 6, 2016* -
## linear algebra

Let L1 be the line passing through the point P1=(9, 0, 0) with direction vector →d1=[3, 2, −2]T, and let L2 be the line passing through the point P2=(−10, 8, 4) with direction vector →d2=[3, 0, 2]T. Find the shortest distance d between these two

*asked on December 1, 2017* -
## Math

Emily has 85 books on her bookshelf. Of those books, 20% are mysteries, 18 are adventure stories, and the rest are fantasies. What is the simplified ratio of fantasies to total books on her bookshelf (i got 10:17 ) answers list:35:50 7:17 5:8 or 10:17

*asked on February 14, 2014* -
## chemistry

can anyone help with this problem please..... Potassium chlorate decomposes according to the following equation: 2KClO3 (s) → 2KCl (s) + 3O2 (g). If a 3.00 g sample of KClO3 is decomposed and the oxygen is collected at 24.0 °C and 0.991 atm, what volume

*asked on November 12, 2015* -
## Physics

Gamma-ray bursters are objects in the universe that emit pulses of gamma rays with high energies. The frequency of the most energetic bursts has been measured at around 3.0 × 10 21 Hz. The speed of light is 3 × 10 8 m/s. What is the wavelength of these

*asked on March 27, 2012* -
## Math

A balloon 150 meters from the observer is rising vertically at constant rate. After 1 minute the angle of elevation is 28 degrees and 29 minutes. What is the angle after 3 minutes?

*asked on June 22, 2016* -
## math

Homeroom 101 and Homeroom 102 share a hallway bulletin board. If Homeroom 101 uses 3/5 of their half to display artwork, what fraction of the board is used to display to display Homeroom 101's artwork? Which is correct-3/5 x 1/2 , 3/5 divided by 1/2. or

*asked on January 29, 2015* -
## Math

Pradip and pam each have apple slices and orange slices. The ratio of apple slices to the total number of slices is 4 to 11. The ratio of the total number of slices to orange slices on Pam's plate is 13:6. Neither person has more than 20 total slices. Who

*asked on October 16, 2017* -
## Language Arts

What is the main message of the words that the Statue of Liberty speaks in "The New Colossus" by Emma Lazarus? Key: *** is my answer A. I am a tired, old woman, but I am still strong. B. Welcome to needy immigrants in search of a new home.*** C. America is

*asked on February 9, 2016* -
## math

There are 3 red paper clips, 5 yellow paper clips, and 6 silver paper clips in a jar. What is the ratio of the total number of paper clips to the number of red paper clips? 14:3 11:3 3:14 or 3:11

*asked on February 14, 2014* -
## Social Studies

Until the 1700s, the mayan calendar was much more accurate than any calendar used in... A. the United States B. Europe C. China D. the Middle East

*asked on March 13, 2015* -
## Math

A retired couple needs $12,000 per year in income to supplement their Social Security. They have $150,000 to invest to obtain this income. They have decided on two investment options: AA bonds yielding 10% per annum and a bank CD yielding 5%. (a) How much

*asked on July 7, 2005* -
## Chemistry

The formula for magnesium carbonate is MgCO3. What is the charge of the cation in Ag2CO3? Would it be +1 or +2 because there are two of Ag?

*asked on July 29, 2015* -
## geography

Explain the effects of the poor service delivery. There must evidence that i actually investigate the poor service delivery physically where possible. Explanation must be with regard to social or Economic or Environmental problem

*asked on April 29, 2017* -
## Math

Which explains why the sequence 64, 4, 1/4,... is arithmetic or geometric? A. The sequence is geometric because it decreases by a factor of 1/16. B. The sequence is arithmetic because it decreases by a factor of 1/16. C. The sequence is geometric because

*asked on March 24, 2015* -
## Math

Everyone in Andy’s class has to do a science project. Out of the 20 students, 80% have completed their project. How many students still need to finish their projects (got 4 students)

*asked on February 14, 2014* -
## Geometry

The Design for a Mural is 16 in. Wide and 9 in High. What are the Dimensions of the largest possible complete mural that can be painted on a wall 24 ft wide by 14 ft wide? And Can you Please Explain. I understood how to do it. but which height or width

*asked on December 12, 2011* -
## Physics

A small cork with an excess charge of +6.0 µC is placed 0.25 m from another cork, which carries a charge of −3.2 µC. What is the magnitude of the electric force between the corks? The Coulomb constant is 8.98755 × 10 9 N · m2 /C 2 . Answer in units

*asked on April 29, 2012* -
## science

A coach tells his little league players that hitting a 0.275 batting average, within 7% percentage error, means that they had a really great season. Seven year old Tommy ended the season hitting a 0.258 batting average. According to his coach, did he have

*asked on August 22, 2017* -
## Physics

A train slows down as it rounds a sharp horizontal turn, going from 86.0 km/h to 44.0 km/h in the 13.0 s that it takes to round the bend. The radius of the curve is 140 m. Compute the acceleration at the moment the train speed reaches 44.0 km/h. Assume the

*asked on October 10, 2017* -
## Chemistry (PLEASE HELP ME)

1. According to the phase diagram for water, how is the state of water determined? a. proceed up a vertical line at any given temperature b. read the phase at the intersection of any given temperature and pressure c. at a given pressure, proceed

*asked on October 13, 2011* -
## MATH

A dietician is planning a snack package of fruit and nuts. Each ounce of fruit will supply zero units of protein, 3 units of carbohydrates, and 2 unitss of fat, and will contain 20 calories. Each ounce of nuts will supply 2 units of protein, 11

*asked on October 19, 2016* -
## statics

Walleye is a common game fish. Adult walleye have a length with a mean of 44 cm and a standard deviation of 4 cm and the distribution of lengths is approximately Normal. What fraction of walleye are longer than 52 cm in length?

*asked on June 22, 2015* -
## Math

The temperature in the morning was -23.9 degrees farenight. It rose 30.3 degrees by noon and dropped 7.5 degrees by evening. What were the noon and evening tempertures ?

*asked on January 2, 2016* -
## Drug addiction substance

Human factors that cause ill health.accidents,crises/disaster and an appropriate way to deal with these

*asked on May 16, 2011* -
## Statistics

Twelve different video games showing substance use were observed and the duration times of game play ( in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to

*asked on March 24, 2014* -
## Math

A rectangular garden plot 16 by 24 meters is to be bordered by a strip of uniform width x meter so as to double the area. Find x.

*asked on August 1, 2017* -
## chemistry

a 2.50-mole quatity of NOCL was initially in a 1.50-L reaction chamber at 400 degrees celcius. after equilibrium was established, it was found that 28.0 percent of the NOCL had dissociated. 2NOCL(g) 2NO(g)+ Cl2(g)

*asked on February 4, 2014* -
## Chemistry

Express the rate of the reaction 2C2H6 + 7O2 -> 4CO2 + 6H2O in terms of: a. Delta [C2H6] b. Delta [CO2] Show work please

*asked on April 1, 2011* -
## physics

A satellite explodes in outer space, far from any other body, sending thousands of pieces in all directions. How does the linear momentum of the satellite before the explosion compare with the total linear momentum of all the pieces after the explosion?

*asked on June 28, 2011* -
## physics

A motorcyclist is trying to leap across a canyon by driving horizontally of the cliff that is 70.0 m high at 38.0 m/s. Ignoring air resistance, use energy conservation to find the speed with which the cycle strikes the ground at a height of 35.0m on the

*asked on July 14, 2011* -
## Math

If the coefficient of sliding friction for steel on ice is 0.05, what force is required to keep a man weighing 150 lbs moving at constant speed along ice?

*asked on January 15, 2017* -
## Science

When are tides in earth's oceans the highest? A. during the moon's waning gibbous phase. B. during the moon's waxing gibbous phase C. when the moon is at a right angle to the sun*** D. when the sun, Earth, and moon are in line

*asked on February 15, 2016* -
## Math look for patterns

Marvin counts six $5 bills. Write each value that he counts. What patterns do you see in the ones digits of the values he counts?

*asked on February 10, 2016* -
## Physics

A 5g bullet is fired horizontally and hits an 8kg block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet?

*asked on March 14, 2017* -
## math

Farmer john has hens, geese, ducks, and two goats the number of hens equals the number if geese and ducks combined . There are 5 fewer geese than ducks. If the total number of animals is 40 how many are ducks

*asked on September 25, 2014* -
## math

I am a little lost on my homework can someone help me with these problems please! With a GM MasterCard, 5% of the amount charged is credited toward a rebate on the purchase of a new car. Express the R as a function of the amount charged A Write a formula

*asked on July 4, 2005* -
## chemistry

The basicity of tetraoxosulphat(iv)acid is 2 explain this statement with an equation showing the reaction between the acid and potassium hydroxide

*asked on May 6, 2018* -
## Science (soon if so)

Over the years technology has gotten a) smaller**** b) heavier c) less complicated d) more expensive What is nanotechnology? a) Nanotechnology is engineering new elements by changing their atoms***** b)Nanotechnology is a way to lengthen radio waves and

*asked on June 8, 2017* -
## Chemistry

Analysis of a sample of an organic compound showed it contains 39.9%carbon,6.9%hydrogen and 53.2%oxygen. a)calculate the empirical formula b)if the relative molecular mass is 60,what is the molecular formula of the compound.(C=12,H=1,O=16)

*asked on December 19, 2015* -
## Cedar High school

A compound is found to have 56.4% potassium, 8.7% carbon, and 34.9% oxygen. What is the empirical formula?

*asked on November 29, 2011* -
## Physics

A balloon rubbed against denim gains a charge of −2.0 µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 5.0 cm? (Assume that the charges are located at a point.) The value of the Coulomb

*asked on April 29, 2012* -
## chemistry

A man pushes on a trunk with a force of 250 newtons. The trunk does not move. How much positive work is done on the trunk?

*asked on January 27, 2015* -
## Chemistry 111

How many moles of methane are produced when 8206 moles of carbon dioxide gas react with excess hydrogen gas?

*asked on July 14, 2011* -
## math

Using the formula, compute the true annual interest rate. Loan amount = $9,500 Monthly payments = $227.50 Time of loan contract = 5 years True annual interest rate (to the nearest tenth) = _____.

*asked on May 16, 2016* -
## physics

A girl throws a water-filled balloon at an angle of 50.0 degree(s) above the horizontal with a speed of 12.0 m/s. The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of 8.00 m/s. (See

*asked on May 17, 2012* -
## English ll

I dentify the complete adj. clause. 1. Many Californians who own homes live on hillsides. A: Who own homes live on hillsides. What word does the adj. clause modify? 3. I elected totake astonomy, which is not a required course. A: Astonomy 4. This course

*asked on October 7, 2011* -
## math

lake superior has a maximum depth of 1.333 thousand feet. there are 5,280 feet in one mile. how deep is lake superior in miles? round to the nearest hundredth if necessary. explain the answer

*asked on January 14, 2015* -
## HVAC

Two HVAC/R technicians are discussing the tape used in HVAC/R repairs. Technician A says that cloth duct tape is preferred for use in attics. Technician B says that UL 181 tape is normally required for duct closing systems. Which one of the following

*asked on June 13, 2017* -
## Math

Find the slope of the following graph

*asked on July 17, 2019* -
## Physics

1. Two people are pushing a disabled car. One exerts a force of 200 N East, the other a force of 250 N East. What is the net force exerted on the car? 2. Two hockey players strike a puck simultaneously from opposite sides. Red #3 hits it with 40 N of force

*asked on October 11, 2018* -
## Physics

A spring has a force constant of 546.5 N/m. Find the potential energy stored in the spring when the spring is a) stretched 4.18 cm from equilibrium. Answer in units of J

*asked on December 11, 2011* -
## Physics

The body of a 1297 kg car is supported on a frame by four springs. The spring constant of a single spring is 1.24 × 10 4 N/m. Four people riding in the car have a combined mass of 259 kg. When driven over a pothole in the road, the frame vibrates and for

*asked on February 16, 2012* -
## Chem

1. According to the phase diagram for water, how is the state of water determined? a. proceed up a vertical line at any given temperature b. read the phase at the intersection of any given temperature and pressure c. at a given pressure, proceed

*asked on October 13, 2011* -
## Physics

1.)A proton moving with speed v enters a narrow (1.0 cm wide) region of magnetic field perpendicular to the direction of the proton's motion. As a result, the proton acquires a small component of speed perpendicular to its original direction of motion.

*asked on March 13, 2019* -
## physics

A compact disk, which has a diameter of 12.0 cm, speeds up uniformly from zero to 4.40 rev/s in 3.20 s. What is the tangential acceleration of a point on the outer rim of the disk at the moment when its angular speed is 2.00(rev/s)?

*asked on October 17, 2009* -
## Math

x is a partly constant and partly varies with y when y =3, x=7 and when y=6, x=9, find the relationship between x and y.Hence find x when y=4. solution?.

*asked on December 24, 2018* -
## Physics

A charge +q is at the origin. A charge -2q is at x = 6.30 m on the +x axis. (a) For what finite value of x is the electric field zero? (b)or what finite values of x is the electric potential zero? (Note: Assume a reference level of potential V = 0 at r =

*asked on January 20, 2018* -
## English

Identify the comma splice. A. Sheema applied for a summer internship she accepted a volunteer position at the hospital. B. Sheema applied for a summer internship, she accepted a volunteer position at the hospital. C. Sheema applied for a summer internship

*asked on October 9, 2013* -
## Physics

A spherical glass ornament is 7.00 cm in diameter. An object is placed 11.8 cm away from the ornament. a) Where will its image form? b) What is the magniﬁcation of the image

*asked on March 29, 2012* -
## Probability

Suppose that the lifetime of a farm tractor follows a normal distribution with a mean of eight years and a standard deviation of 1.7 years. If the manufacturer is willing to replace only 5% of the tractors that fail within the warranty period, how long

*asked on January 23, 2018* -
## Home Economics

List ten careers in Home Economics

*asked on September 20, 2008* -
## science

Which of the following represents a heterogeneous mixture? A.saltwater B.air C.bleach and water D.chicken noodle soup I think the answer is D. Chicken noodle soup. I don't know exactly.

*asked on February 2, 2015* -
## Physics

A 5 gram bullet is fired horizontally and hits an 8 kilogram block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet?

*asked on March 14, 2017* -
## physicsss

A sled weighing 200.0 N is pulled along a horizontal surface with a horizontal force of 45 N. The coefficient of static friction is 0.65 and of kinetic friction is 0.40. What is the force of friction? So I got Ff=200*.4= 80N

*asked on January 15, 2015* -
## analytical chemistry

Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water.

*asked on September 21, 2016* -
## Algebra

As Sales Manager for Montevideo Productions, Inc., you are planning to review the prices you charge clients for television advertisement development. You currently charge each client an hourly development fee of $2,600. With this pricing structure, the

*asked on February 21, 2012* -
## physics

A child's swing is held up by two ropes ties to a tree branch that hangs 13.0 degrees from the vertical. If the tension in each rope is 2.28 N, what is the combined forece (magnitude and direction) of the two ropes on the swing?

*asked on October 17, 2009* -
## Chem HELP!!!!!!!

To 0.350L of 0.150M NH3 is added 0.150L of 0.100M MgCl2. How many grams of (NH4)2So4 should be present to prevent precipitation of Mg(0H)2(s)?

*asked on April 18, 2009* -
## Chemistry

I'm confused on this problem A gaseous mixture inside a rigid steel vessel contains 75% CO2 and 25% H2O by volume at 175 degrees C and 225 kPa. The mixture is then cooled to 0 degrees C, thereby condensing the water vapor. What is the pressure of the CO2

*asked on November 27, 2011* -
## Chemistry 111

How many moles of nitrogen N are there in 71.0g of Nitrous Oxide(N2O)?

*asked on July 14, 2011* -
## Chemistry Titration Lab HELP!

Hi everyone! I just got a new lab that I MUST complete today, and it's about titration- I have absolutely no clue how to do it, it just doesn't make sense to me! I hope that someone can help explain to me how to do it so I can finish ASAP!! Thanks a lot,

*asked on June 11, 2008* -
## English

When summarizing the of a plot, one should notice the key ideas about how the conflict builds.

*asked on October 6, 2016* -
## Living Waters private school

Can I choose Human resource or safety officer when am doing maths literacy, economic,business and tourism

*asked on July 29, 2015* -
## chemistry

a first order reaction has a rate constant of 7.5 x 10^-3/s. The time required for th reaction to be 60% complete is

*asked on June 17, 2008* -
## mythology

Can someone tell me if god is real or if it is just a myth? I have a question on my homework and it says something about god but I don't know like anything about it.

*asked on December 12, 2018* -
## Chem

What is the enthalpy for the following reaction? overall: C2H4+H2O--->C2H5OH is -1411kJ correct??

*asked on November 4, 2010* -
## Physics

A bicyclist of mass 65 kg stands on pedal. The crank is .170 m long and makes a 45 angle with the vertical. The crank is attached to the chain wheel which is 9.70 cm. What force must the chain exert to keep the wheel from turning?

*asked on November 12, 2012* -
## Linear Algebra

Given the following vector X, find a non-zero square matrix A such that AX=0: X=[2 -5 3]^T Im not sure how i would find the sqare matrix a?

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

A propeller spins at 1880 rev/min. the equals 197 rads/sec b. What is the angular displacement of the propeller in 2.50 s ?

*asked on December 6, 2009* -
## Biochem

HEPES, is a commonly used component of physiological buffers. The PKa of the protonated amino group of HEPES is 7.55 at 25C. Describe the preparation of 1.00L of 0.100M HEPES buffer, pH 8.00, from the sodium salt of the basic form of HEPES (MW 260.3), .0M

*asked on September 13, 2010* -
## Algebra 2 math

What is the 32nd term of the arithmetic sequence where a1 = 12 and a13 = –60?

*asked on September 19, 2011* -
## AP Chemistry

A mineral crystallizes in a cubic closest packed array of oxygen ions with aluminum ions in some of the octahedral holes and magnesium ions in some of the tetrahedral holes. Deduce the formula of this mineral and predict the fraction of octahedral holes

*asked on November 17, 2009* -
## Chemistry

Suppose that a device is using a 5.00-mg sample of silicon that is doped with 1 × 10-5% (by mass) phosphorus. How many phosphorus atoms are in the sample?

*asked on March 6, 2018* -
## Analytical chemistry

Calculate to four decimal places the mass of pure dry CaCO3 required to make 1 L of a 1000 ppm Ca stock solution.

*asked on October 20, 2016* -
## AP Chemistry

An aqueous antifreeze is 40.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.05 g/cm3. Calculate the molality, molarity, and mole fraction of the ethylene glycol.

*asked on November 28, 2009* -
## Science

1000w heater is used in the determination of specific latent heat of vaporization of water and it took 4 minutes for 500g of water to be changed to steam. calculate the latent heat of vaporization of water.

*asked on June 21, 2019* -
## Physics

The velocity of a train is reduced uniformly from 40km/sec while travelling a distance of 100km. A. Calcukate the retardation. B. How much farther will it trqvel before coming to rest, assuming the same retardation.

*asked on August 4, 2019* -
## Statistics

Suppose a basketball player, Player A, made 80% of her free throw attempts last season and that she continues to shoot free throws at the same rate. Assume that free throw attempts are independent. Let the random variable X be the number of free throws

*asked on March 2, 2012* -
## biology

which of the following is not a characteristioc of life

*asked on June 5, 2019* -
## Dynamics

A level fight bomber flying at 300 ft/s releases a bomb at an elevation of 6400 ft. Approximately how long before the bomb strikes the earth?

*asked on January 15, 2017* -
## Biochemistry

Sorry! HEPES, is a commonly used component of physiological buffers. The PKa of the protonated amino group of HEPES is 7.55 at 25C. Describe the preparation of 1.00L of 0.100M HEPES buffer, pH 8.00, from the sodium salt of the basic form of HEPES (MW

*asked on September 14, 2010* -
## Pre- Algebra

If you were to roll a fair number cube 120 times, how many times would you expect to roll a 4 based on theoretical probability

*asked on May 19, 2017* -
## physics

The two forces F1 and F2 act on a 27-kg object on a frictionless tabletop. If F1 = 7.1 N and F2 = 33 N, find the net force on the object and its acceleration. WHAT IN the world...how do i figure this out!

*asked on November 7, 2010*