# Helen

Newest questions and responses by Helen-
## Math

When a fifth of a certain number is added to 3,the result is 17 .what is the number?

*asked on October 22, 2018* -
## 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* -
## Algebra

How would you solve this systems of equations? Y-7=-2x 4x+2y=14

*asked on August 3, 2017* -
## 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

How do I solve 4|8x-2|=8? And also 6w-1 over 5 -3w= 12w-16 over 15?

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

I have a question related to oxidizing agents. Why do some oxidizing agents have to be in acid medium? For example the potassium permanganate. I would also like to know if there are other examples of oxidizing agents that have to be in acid medium or where

*asked on June 5, 2017* -
## @Ms.Sue please help!!:(Math

Sound intensity is inversely proportional to the square of the distance from the sound source; that is I= k/ (r)^(2), where I is the intensity, r is the distance from the sound source, and k is a constant. Suppose that you are sitting a distance R from the

*asked on April 17, 2017* -
## Maths

A man 1.5m tall is 15m away from a tower 20m high.What is the angle of elevation of the top of the tower from his eyes?

*asked on April 11, 2017* -
## Math

Lele I want to bought a sandbox in her backyard the sandbox she build has an area of one do you want to square feet yard drive the sandbox to blow and label the side to show all the possible of21 and widths

*asked on March 30, 2017* -
## 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

Describe the points on the earth’s surface that are visible to a viewer who is 100 miles above the North Pole. Would it be half of the surface area of Earth?

*asked on January 31, 2017* -
## Algebra

(-11x to the 5th power +4x + 8x to the 3rd power)+(-13x-2+7x to the 3rd power)

*asked on January 18, 2017* -
## Algebra 2

Simplify, (2 sqrt3x^5 - 2sqrt y)^2

*asked on January 17, 2017* -
## Algebra 2

Write as a sqrt, 2^3/2 x^3/2 y^5/2

*asked on January 17, 2017* -
## 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* -
## Math

If Donna uses 4 1/2 meters of fabric, what is the total length of the pieces of fabric left? Thank you

*asked on October 6, 2016* -
## Algebra

The Patterson family and the bell family each used their sprinklers last summer. The wayer output rate for the patterson family's sprinkler was 25 L per hour. The water output rate for the bell family's speinkler was 15 L per hour. The familiez used their

*asked on July 26, 2016* -
## 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* -
## 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* -
## Math

How many solution are there in the following system of equations? x=-6y+4 2x+12y=8 Please help me and explain it to me! I would really appreciate if you guys answered it!

*asked on May 23, 2016* -
## Reading

The West Wind It’s a warm wind, the west wind, full of birds’ cries; I never hear the west wind but tears are in my eyes. For it comes from the west lands, the old brown hills, And April’s in the west wind, and daffodils. It’s a fine land, the west

*asked on May 11, 2016* -
## Math

Determine whether the statement is true or false. Explain. "The median divides the box of a box-and-whisker plot in half." I think it is true but I can't think of an explanation.

*asked on May 3, 2016* -
## Geometry

A square pyramid has a surface area of 175 square inches. The square base has side lengths of 5 inches. Find the slant height of the pyramid.

*asked on April 6, 2016* -
## 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!!)

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

Explain how you could find the volume of a pyramid given a prism with the same base are and height. Justify your answe

*asked on April 3, 2016* -
## Math

Explain how you could find the volume of a pyramid given a prism with the same base are and height. Justify your answer.

*asked on April 3, 2016* -
## Math

What fraction of the volume of the rectangular prism is the volume of the rectangular pyramid?

*asked on April 3, 2016* -
## Math

Suppose Cylinder A has the same height but twice the radius of Cylinder B. What is the ratio of the volume of Cylinder B to Cylinder A?

*asked on March 30, 2016* -
## Math

How does changing the dimensions of a cylinder affect the cylinder's volume?

*asked on March 30, 2016* -
## Reading

Of all the gods and goddesses of Olympus, perhaps none was loved by humans as much as Demeter. Demeter was the goddess of the soil and of the crops, to which she tended with great care all through the year. Demeter enjoyed her duties because she cared for

*asked on March 16, 2016* -
## Reading

Of all the gods and goddesses of Olympus, perhaps none was loved by humans as much as Demeter. Demeter was the goddess of the soil and of the crops, to which she tended with great care all through the year. Demeter enjoyed her duties because she cared for

*asked on March 16, 2016* -
## Reading

Of all the gods and goddesses of Olympus, perhaps none was loved by humans as much as Demeter. Demeter was the goddess of the soil and of the crops, to which she tended with great care all through the year. Demeter enjoyed her duties because she cared for

*asked on March 16, 2016* -
## Reading

*asked on March 16, 2016* -
## Reading

*asked on March 16, 2016* -
## chemistry

a 500ml stock solution of NAOH has a purity of 70% and a density of 1.9g/ml. calculate the concentration that would be in a 1L solution. calculate the molarity. What volume would we have to take to prepare 250ml of a solution of 0.1 mol/l

*asked on March 12, 2016* -
## Math

Angles K and O are supplementary. If measurement angle K= 3x+10 and measurement angle O= 10x-12, find the measure of each angle. I don't understand how to solve.

*asked on March 7, 2016* -
## Math

Determine whether the statement is true or false. If the statement is true of false explain why. Can you please help?

*asked on March 7, 2016* -
## Math

Susan tossed a die 1,038 times. Which of the following would be a good estimate of the number of times she got the number 3 on the die? A: 186 B: 128 C: 306 D: 273 Can someone please help and explain this to me?

*asked on March 6, 2016* -
## Math

Explain what happens to the volume of a prism when its dimensions are tripled. Answer: Is the volume going to be 9 times larger

*asked on February 24, 2016* -
## Math

How does changing the dimensions of a figure affect its perimeter? area?

*asked on February 21, 2016* -
## Chemisty

Find the mass in grams of 2 x 10^23 of F2 (12.6 grams of F2)

*asked on February 17, 2016* -
## Math Scale Drawing

The length of a classroom is 30 ft. What is the scale factor if the length of the classroom on the scale drawing is 3.6 inches?

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

The length of a classroom is 30 ft. What is the scale factor if the length of the classroom on the scale drawing is 3.6 inches?

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

The length of one side of the school building is 100 feet. if you use a scale factor of 1:250, what is the length of your scale drawing? Please help me and explain how you get your answer!

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

Ernest Hemingway's first job was as a newspaper writer in Kansas, at the age of 17. He wrote about everything that happened at the local police station, the train station, and the hospital. Hemingway worked for the newspaper for six months. The Red Cross

*asked on February 2, 2016* -
## Reading

His first fight was for his health and vigor. It all began at the age of nine. As a child, he was weak and thin because of his asthma. His father, the first Theodore, motivated him to fight his ill health. On the third floor of the house in New York where

*asked on February 2, 2016* -
## Math

The chart shows the total number of students in two school orchestras and the number of students in each orchestra who play string instruments. Which orchestra has the greater percent of its members as string instrumentalist? Orchestra Number of String

*asked on January 26, 2016* -
## Math

42

*asked on January 11, 2016* -
## 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* -
## 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* -
## Grammar

Find the simple subject and simple predicate of this sentence. We have to leave immediately to go to the meeting at the recreation center. the simple subject is we and the simple predicate is have because to leave is an infinitive phrase

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

For each word, label the parts of speech. We have to leave immediately to go to the meeting at the recreation center. 1. pronoun 2. verb 3. verb 4. verb 5. adverb 6. verb 7. verb 8.preposition 9.adjective(article) 10.noun 11. preposition 12. adjective

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

For decades, centuries even, the most common way to train a dog was to punish the dog when it did something wrong. This is known as negative training. Often, a choke chain would be used. If the dog did something wrong, such as jumping up on someone or

*asked on December 14, 2015* -
## Grammar

Today, it is common to open the newspaper and see that a famous musician is being sued for stealing music from another famous musician. Sometimes, the issue is that a very small section of a song sounds like a song that had been written before. Sometimes,

*asked on December 14, 2015* -
## Language Arts

Are these right? My aunt discovered a skunk under her porch and called the Humane Society for help in removing it. *simple sentence Some committee members preferred either a musical comedy or a mystery. *simple sentence

*asked on December 6, 2015* -
## 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* -
## math

How can $12,600 be split between two investments, one paying 6% annually and one paying 8% annually so that the interest from the two accounts equals $864

*asked on October 21, 2015* -
## Gr.11 Biology

In guinea pigs, black cot is dominant to albino. Rough coat us dominant to smooth coat. A black smooth guinea pig was mated with an albino rough guinea pig. Their offspring were black rough and black smooth. If these were the only produced over a period of

*asked on October 6, 2015* -
## Gr. 11 biology

Your aunt moves out of the town and leaves you her mouse, Henry. In order to make some money, you decide to breed mouse and sell the offspring. In looking over Henry's family history, you discover that Henry's grandfather expressed a rare genetic disorder

*asked on October 3, 2015* -
## Gr.11 Biology

In humans, muscular dystrophy is a condition in which the muscles waste away during early life, resulting in death in the early teens. It is due to recessive sec-linked gene. A certain couple have 5 children- 3 boys, ages one, three and ten; and 2 girls,

*asked on October 3, 2015* -
## 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* -
## Data management

Which of the following three events is more likely to happen that a person get a) At least 1 six when 6 dice are rolled; b) At least 2 sixes when 12 dice are rolled, or c) At least 3sixes when 18 dice are rolled. Explain why.

*asked on July 26, 2015* -
## Data management

Problems solving with Matrices [-3 1] * [ 4 7 0] 2 5 -3 -5 1 I'm stuck with this matrices. Please help me~~

*asked on July 23, 2015* -
## Math

Determine the probability of drawing two cards from a deck( without replacement) and getting the same suit using 1) conditional probability 2) combinations

*asked on July 14, 2015* -
## Math

Ali has 250 songs on her MP3 player. Of those, 150 are dance songs, 50 are R&B songs, and 30 songs are both dance and R&B. 1) when Ali has her player on shuffle, what are the odds in favour of her hearing a dance song that is not an R&B song? 2) what are

*asked on July 12, 2015* -
## Math

Suppose that a graphing calculator is programming to generate a random natural number between 1 and 10 inclusive . What is the probability that the number will be prime?

*asked on July 10, 2015* -
## Math

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

*asked on July 8, 2015* -
## Data management

In the expansion of (1+x) to the power of n, the first three terms are 1-0.9+0.36. Find the values of x and n.

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

Explain the following quote with your understanding of the concept of gas mixtures (Ch. 10 concepts) and the composition of “common air” (i.e. the air in the atmosphere). Inflammable air is hydrogen. “By the experiments... it appeared that when

*asked on May 30, 2015* -
## 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* -
## Chemistry

determine the mass of titanium and iodine that react if 1.38 x 10 to the third kJ of heat emitted by the reaction

*asked on May 2, 2015* -
## Chem

What mass of KCl in grams is formed when 2.00lbs of KClO3 is decomposed?

*asked on April 12, 2015* -
## 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* -
## algebra

An advertising agency conducted a survey and found that the number of units sold, N, is related to the amount, a, spent on advertising (in dollars) by the following formula:

*asked on February 18, 2015* -
## Math

Tension wants to build a soccer field for his team. The area of the field should be 125 square feet. The width is 1/5 of the length. What are the dimensions of the field?

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

How can I get an essay in Sociology?

*asked on December 9, 2014* -
## 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* -
## 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* -
## physics

A woman raises a 65N box 16m in 4 seconds.Calculate the work done by the woman on the box

*asked on September 30, 2014* -
## Finite Math

suppose x sheets from a 500 sheet ream of paper have been used. Write an algebric expression to represent the number of sheets that are left

*asked on July 29, 2014* -
## 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* -
## 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* -
## 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* -
## economics

To save on gasoline expenses, Edith and Mathew agreed to carpool together for traveling to and from work. Edith preferred to travel on I-20 highway as it was usually the fastest, taking 25 minutes in the absence of traffic delays. Mathew pointed out that

*asked on July 3, 2014* -
## Strategic Leaders

Identify four research sources that provide context for at least three activities of strategic leaders.

*asked on April 15, 2014* -
## Geometry

The word cosine literally means "the complement of the sine." Write a paragraph explaining how complements of sine and cosine are connected. I know that the sine and the cosine of complementary angles are the same. but how can i add more details/write a

*asked on April 15, 2014* -
## 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* -
## Help ASAP Statistic

. A new medical test provides a false positive result for Hepatitis 2% of the time. That is, a perfectly healthy subject being tested for Hepatitis will test as being infected 2% of the time. In research, the test is given to 30 healthy (not having

*asked on April 2, 2014* -
## Chemistry 2

Compare endothermic and exothermic reactions in terms of potential energy, heat flow, and observed temperature changes. Explain your answer in complete sentences.

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

here are five seniors in a class, for each situation, write how the binomial formula is used to calculate the probability. a) In how many ways can you choose one senior to represent the group? b) In how many ways can you choose two seniors to represent the

*asked on March 30, 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* -
## Canvas art

Who paints using the name Cobot

*asked on March 20, 2014* -
## Canvas art

Who paints using the name Cabot

*asked on March 20, 2014* -
## 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* -
## 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*