# Posts by Helen

Total # Posts: 527

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 I can find them.

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 TV, where its sound ...

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?

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

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 the chute? b)How much ...

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?

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

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

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

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 distributed B. ...

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

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 sprinklers ...

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 speed of each particle...

math
the average age of a family of eight is 30 year .the average age of the children in the family is 19years .if the mother is four years younger than the father ,calculate the age of the father

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

Math
So are there infinite solutions?

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!

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 land, ...

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.

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.

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!!)

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.

Math

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

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

Math
Thanks!

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

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?

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

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 mortals and wanted to...

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 mortals and wanted to...

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 mortals and wanted to...

1 is D.

Is the answer to #1 A?

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 mortals and wanted to...

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 mortals and wanted to...

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

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.

Math
thanks

Math
The statement is "An obtuse angle and an acute angle are always supplementary."

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

Math
so is it 1/6*1038?

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?

English
Colon

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

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

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

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?

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?

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!

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 then hired him to ...

Is #1 A or D?

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 he was born, his ...

Math
oh Latonia has the greater percent

Math
Both are 36

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 Players Glenshire 43 ...

Math
42<-6d = d<-7

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. 2 J b. 2 x 108 J c. ...

Grammar
For #12, I meant to put simple

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 began to cry, and the...

Grammar
Thank You!

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

Grammar
No, I was asking if all the "to" were preposition in the sentence

Grammar
are all of them a preposition

Grammar
ok thanks

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 (article) 13. adjective, ...

Biology
breaks diwn immune system noo

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 chasing a squirrel, the ...

Grammar
ok thanks

Grammar
D?

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, the issue is that a ...

Language Arts
ok thank you

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

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. What is the percent in...

But shouldn't ordinary interest be x days out of 360 and exact interest be x days out of 365? My calculations led me to \$4,850.10 as the remaining balance after the payment of \$4,000. MV (120 days) = \$8,500(1+ 9% x 120/360) = \$8,755 = \$8,755 - \$4,000 = \$4,755 MV (80 days...

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

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 years of matings, ...

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 which leads ...

Gr.11 Biology
Thank you :)

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, ages five and seven. ...

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

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.

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~~

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

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 the odds against her ...

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?

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

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.

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 many ways could the ...

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 inflammable air ...

Algebra
Assignment 1: LASA 2: The Apportionment Problem You are a census officer in a newly democratic nation and you have been charged with using the census data from the table below to determine how 100 congressional seats should be divided among the 10 states of the union. State ...

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

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

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

Calculus 2 - Series
Ahh, for the first problem, I wasn't sure if I was supposed to plug in numbers (1-5) or if there was a particular number I was to plug in rather than randomly, but now realizing that it's between a1-a5 with the numbers accordingly. And for the second problem, I was ...

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 − 1) a1 = ? a2 = ? ...

Health
Its B

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