Sunday
December 11, 2016

# Posts by Selena

Total # Posts: 215

Math algebra
David Robertson works as a chemical engineer for U.S. peroxide Corporation. David has 2500 gallons of commercial-grade hydrogen peroxide solution that is 60% pure hydrogen peroxide. How much distilled water(which is 0% hydrogen peroxide) will David need to add to the solution ...
November 9, 2016

Chemistry
What are the elements in Group A1 on the periodic table? alkali metals alkali earth metals inner transition metals ** halogens
October 12, 2016

English
Well for the first one I immediately scratched out C and D because they didn't make sense and had nothing to do with what the question was asking, so I stuck between A and B because but now I'm re-thinking and feel it might be D. Could you explain why my choice was ...
October 11, 2016

English
Why is it important that "The Story of an Hour" takes place in the nineteenth century? In the nineteenth century, women were not considered equal to men. *** The characters use nineteenth-century expressions that are hard to understand. *** Nowadays, people don't...
October 11, 2016

Math3c
1.Find an A.P. such that the sum of the first three terms is one half the sum of the next four terms,the first term being 12. 2.In an A.P.,the sum of the first three terms is 18,and the sum of the squares of these terms is 126.Find the terms.
August 17, 2016

chemistry
Some physical properties of water are shown below: melting point 0.0°C boiling point 100.0°C specific heat solid 2.05 J/g·°C specfic heat liquid 4.184 J/g·°C specific heat gas 2.02 J/g·°C ΔH° fusion 6.02 kJ/mol ΔH° ...
May 31, 2016

Math
Sally has a recipe that needs 1 1/2 tsp. of butter for every3 cups of milk. If Sally increases the amount of milk to 13 1/2 cups of milk, how many tsp. of butter are needed?
May 19, 2016

Math
Peter's lawn is 4800 square feet in area, and he mowed 1200 square feet of it. What fraction of his lawn still needs to be mowed?
April 2, 2016

find the midpoint of a segment with endpoints at (7,9) and (-1,-1)
February 22, 2016

math
i am less than 45 greater than 35 divisible by 10,5 what number am i
February 15, 2016

Physics
An 1750 kg weather satellite moves in a circular orbit with a gravitational potential energy of 1.69 x 10^10 J. At it's location, free-fall acceleration is only 6.44 m/s^2. How high above Earth's surface is the satellite?
January 26, 2016

Chemistry
Consider the chemical reaction below equated   2N2O5 (g) -> 4NO2 (g) + O2 (g) knowing that a certain period of time, N2O5 consumption rate is 0.10 mole / s, determine for the same time interval: a) the average rate of formation of NO2 b) the average speed O2 formation
January 20, 2016

The national debt of a small country is 7,730,000,000 and the population is 2,484,000. What is the amount per person?
January 12, 2016

English 2
Write an essay of at least 250 words that describes and explains examples of figurative language you found in Animal Farm when you completed your response journal on that topic. Include one example of each of the five types of figurative language from the words or phrases you ...
November 18, 2015

Math
what is the difference between |-3| and -3.
October 5, 2015

Health
Socialize. It makes sense. You wanna be around people so they can help you.
October 5, 2015

Math
Thank you!!!
August 25, 2015

Math
Write the expression as a single fraction and simplify. 3/a + 3/b Is this when you cross multiply and get 3a + 3b? Except the answer has to be a fraction so I am not sure.
August 25, 2015

probability
Please help me solve this problem step by step pleaseeee! The probability that an archer hits the target is p= 0.8, so the probability that he misses the target is q = 0.2. It is known that in this situation the probability that the archer hits the target exactly r times in n ...
August 12, 2015

Algebra
Can anybody help me on this problem for my Algebra 2 class, I am having a hard time tyring to solve it step by step. The probability that an archer hits the target is p = 0.8, so the probability that he misses the target is q = 0.2. It is known that in this situation the ...
August 12, 2015

Algebra
I need help step by step please I keep getting a wrong answer of 252? Find the 24th term in the expansion of (a + b)^ 25
August 12, 2015

Algebra
I need help step by step please I keep getting a wrong answer of 252? Find the 24th term in the expansion of (a + b)^ 25
August 11, 2015

Algebra
Can anybody help me on this problem for my Algebra 2 class, I am having a hard time tyring to solve it step by step. The probability that an archer hits the target is p = 0.8, so the probability that he misses the target is q = 0.2. It is known that in this situation the ...
August 11, 2015

Calculus
A strong swimmer is one mile off shore at point P. Assume that he swims at the rate of 3 mile per hour and walk at the rate of 5 miles per hour. If he swims in a straight line from P to R and then walks from R to Q, how far should R be from Q in order that he arrives at Q in ...
June 13, 2015

Calculus
A wire 17 inches long is cut into two pieces. One piece is bent to form a square and the other is bent to form a rectangle that is twice as wide as it is high. How should the wire be cut in order to minimize the total area of the square and rectangle?
June 13, 2015

Logs
log (sqrt4(x^16 / y^4)) What is the value of the expression when logx=8 and logy=1? My work: x=10^8 y=10 I tried to plug these in but my calculator but it said "overflow." Is there an easier way to do this?
May 31, 2015

Math
(-3,5) (-2,-6) I do not understand equation of a line
March 18, 2015

Math
equation of a line (-3,5) (-2,-6) can you help with this exercise
March 16, 2015

physics
calculate the linear speed of a point on the record at the beginning and the end of the record that rotates at 33rev/min r1=7cm,r2=15cm
March 10, 2015

physics
March 10, 2015

United states history
What similarities do you see between the United States today and the United States of the past? What issues and problems do we continue to grapple with? What successes do we share with Americans in the past? I want to find something now in united states that was similar to the...
December 8, 2014

math
what is 82 over 100 in simplest form?
November 17, 2014

US Gov't
Which Roman contribution to political theory was adapted by the Founding Fathers?
November 5, 2014

Geometry
P->P'(-8,-3) for the glide reflection where the translation is (x,y)->(x,y-5) and the line reflection is x=-5. what are the coordinates of P? (-8,-8) (-8,2) (-2,-3) (-2,2)
October 29, 2014

Math 11
an airplane is flying 100km north and 185 km west
October 20, 2014

English
Of Mice an Men
October 13, 2014

English
1. Why does George try to prevent Lennie from playing with small animals? (1 point) He doesn't want Lennie to have a pet until he proves he can keep out of trouble. He is worried that Slim will be angry if Lennie plays with the puppies. He is embarrassed by Lennie's ...
October 13, 2014

Chemistry
Weight of the Rock Salt Sample: .343 (g) Weight of the Rock Salt Solution: 9.910 (g) Trial #1 Trial #2 Trial #3 Weight of Rock Salt Solution Delivered (g) : .89 1.17 .786 Weight of AgNO3 Solution Delivered (g) : 1.53 .548 .786 Concentration of AgNO3 : 4.70e-4 (moles of AgNO3/g...
October 4, 2014

Physics
I don't know if my answers are right. D: 1)Why is a time interval always positive? I'm not really sure but I wrote down something with vectors and scalars. 2)If the average acceleration of a car is zero in a given time interval, what can you tell about the displacement...
October 1, 2014

Physics
Thank you guys so much ! ^^
October 1, 2014

Physics
Little Timmy falls down a well and hits the water 1.5s later. Determine the distance from the top of the well to the water below. Just an equation would be fine. Thanks in advance.
October 1, 2014

Algebra 2
Nvm, I got it >u<
October 1, 2014

Algebra 2
I need to use zero product property on these equations and I just need a few examples to get myself started on the other problems since I don't understand it at all. :c Help is appreciated. Thanks in advance. f(x)=x^2+8x+12 g(x)=6x&2+20x-16
October 1, 2014

Physics
Starting from rest, Mr.M's bus achieves a velocity of 25 m/s in a distance of 1.0 km. Find the time and the acceleration. I don't know which formula to use. Delta T = Vf - Vi / Aavg ?
September 23, 2014

Physics
Thank you so much! You didn't have to solve it for me, I only needed the formula, but thanks a lot!^^
September 23, 2014

Physics
A car enters the freeway with a speed of 7.2 m/s south and accelerates uniformly for 4.2 km in 4.0 min. How fast (in m/s) is the car moving after this time? I only need the formula. My teacher gave us a list but did not tell the class which equation is for which. Help please.
September 23, 2014

Chemistry
What is the molarity of HCL if it takes 16.5 mL of 0.100 M NaOH to titrate 10.0 mL of HCl? HCl + NaOH -> H2O + NaCl molarity = moles of solute/liters of solution
September 18, 2014

AP Calculus
Find an equation of all tangent lines for the curve x^2-xy+y^2=16 x=-2 2x-(xy'+y(1))+2yy'=0 2x-xy'+y+2yy'=0 y'(-x+2y)=-2x-y y'=-2x-y/-x+2y y'=-2(0)-y/-(0)+2y y'=-y/2y Not sure what to do now?
September 14, 2014

Operating Systems
Given that main memory is composed of only three page frames for public use and that a seven-page program (with Pages a, b, c, d, e, f, g) that requests pages in the following order: a, c, a, b, a, d, a, c, b, d, e, f. Using the FIFO page removal algorithm, indicate the ...
September 4, 2014

physics
To estimate how high the cliff is you throw a rock off the edge and 7.8 s later you hear the rock hit the ground. The speed of sound is 330 m/s. Ignoring air resistance how high is the cliff?
September 1, 2014

math
why is when you equal Pythagorean Theorem the c does nt have the squard
August 27, 2014

Math
That helped a lot Steve. Thank you.
June 11, 2014

Math
The president of Texas state University makes three times as much money as one of the department heads. If the total of their salaries is 290,000, find each worker's salary.
June 11, 2014

Algebra
thanx damon :D
June 2, 2014

Algebra
Simplify: b. 4√10-√10
June 2, 2014

Algebra
thank you peeps
June 2, 2014

Algebra
What are the solutions to the system? (Hint: graphing is the easiest!) y = x2 + 2x - 45 y = -3x + 5
June 2, 2014

math for me!!!!!!
cross multiply
June 2, 2014

Algebra
lol damon answers all my question soooo thanx very much XD
June 2, 2014

Algebra
Use the Zero Product Property to solve the equation: -3m(2m – 5) = 0
June 2, 2014

Algebra
thanx both of yall XD
June 2, 2014

Algebra
A ball is thrown into the air. The height in feet of the ball can be modeled by the equation h = -16t2 + 20t + 6 where t is the time in seconds, the ball is in the air. When will the ball hit the ground? How high will the ball go?
June 2, 2014

History
what was the climax of british French rivalry in north American?
May 21, 2014

Chem
What will the products be for Ni(s) + 2Na^+(aq)? I don't think this is even possible, so will this reaction even be possible?
March 2, 2014

Chem
What is the product for the reaction of Ni(s) + 2Na^+(aq)? I don't think this is possible no?
March 2, 2014

Chemistry
3) A student mistakenly uses the cuvette containing the most dilute standard solution, rather than the cuvette containing deionized water, as the blank solution. I don't understand why there would be lower concentration of Cr(VI) ion...
March 2, 2014

Algebra 1b!
1. Find the excluded value of x for the polynomomial expression 4x/6 a. 6 b. -6 c. 1/6 d. -1/6 2. Simplifly 3-2x/7 + 4x+5/7 a. 2x+8/14 b. 2x+8/7 <--- c. x+1/7 d. 2x+2/7 3. Simplify 6ab^6/4a^7b^10 * a^3b^4/2a^7b^6 a. 7x/8 - 2x/8 b. -5x/8 c. 3a^2b^3/4a^7b^8 d. a^2b^5/2a^7b^8...
December 9, 2013

A. 75 % B. 12.5% C. 25% D. 3.13% E. 9.38% 3. what percentage of land on the earths surface is inhospital lands? - B 4. what percentage of earths surface is covered by land? - C 5. what percentage of land on earth is usable, for living on, but not for agriculture/farming?-D 6. ...
November 15, 2013

Earth space science.
November 15, 2013

A. 75 % B. 12.5% C. 25% D. 3.13% E. 9.38% 3. what percentage of land on the earths surface is inhospital lands? - B 4. what percentage of earths surface is covered by land? - C 5. what percentage of land on earth is usable, for living on, but not for agriculture/farming?-D 6. ...
November 15, 2013

Earth space science
Well lets say For city A; 57. 156. 53 b;61. 135. 56 c; 58,136. 11 d; 67.65.198
November 14, 2013

Earth space science
I need help with this. the map doesnt show anything and idk how to post the map on here... Match the cities A,B,C, and D with the weather description of the surface model (To the right of each letter) a. city A b. City B c. City C d. City D A. Pressure of 1015.1 and south east...
November 14, 2013

Algebra 1b!
Could you guys check my answers? 1. Graph the function and identify the domaine and range. y=-1.5^2 Domain; (-,+) Range; (-,0) ( my answers.) 2.How is the graph of y=-2x^2-5 different from the graph of y=-2x^2 It is shifted units up it is shifted 5 units down <--- It is ...
November 8, 2013

English!
This is what i got so far but i need help with an opening paragraph and conclusion Mark twain used huck as narrator to see the innocent view of these difficult adult themes. in the eyes of a child, the morality of the situations he finds are much more concerning than most ...
November 7, 2013

English
For english i'm doing facts about mark twain and if i put " Around all of the facts, is it still plagiarism?
November 7, 2013

Huckleberry Finn
And i know, i just need all the notes before i write.
November 7, 2013

Huckleberry Finn
For the third; Tom sawyer and Huckleberry Finn both loved going on adventures,where it was pretend and really loyal to friends.. Tom was more imaginative but in some ways the less kind hearted of the two. Write about one of the authors we have studied. ANd last In 1846, when ...
November 7, 2013

Huckleberry Finn
Well for the first 2 i got answers. But this is an expository essay rough draft and we choose a short story and write about it with these questions. First one my answer is; He used huck as narrator to see the innocent view of these convulted adult themes. in the eyes of a ...
November 7, 2013

Huckleberry Finn
Explain how the author created the character (characterization). Explain the theme of a piece of literature. Compare and contrast two pieces of literature. Write about one of the authors we have studied.
November 7, 2013

Math
42000 and 48000 44286
September 25, 2013

physical science
I am having a little trouble with this problem. can someone please HELP! During a race, a runner runs at a speed of 6m/s. 2 seconds later, she is running at a speed of 10 m/s what is the runner's acceleration?
August 7, 2013

math
How would I solve this; John is paid at an hourly rate of \$15 and over time rate of 1.5 times his hourly rate. If john puts in w regular hours and y overtime hours in a week, what is his total wage for the week? (Monday-Friday
July 1, 2013

math
1/2 + (-5/6) =?
June 28, 2013

physical education
What nutritional supplement is recommended for helping the body handle stress? A. Zinc B. Iron C. Vitamin C D. No supplements are recommended for stress management I think its a but im not sue please help
May 31, 2013

english
Which of the following is not a correct option for writing out the date in question? A. 25 January 2000 B. January 25, 2000 C. 2000, January 25 D. 01/25/00 I think this one D
May 2, 2013

english
Regarding the use of commas, which one of the following statements is accurate? A. A parenthetical use of commas is usually confusing to the reader. B. There is no need for commas that indicate added details in a sentence. C. Commas are needed to separate a list of three or ...
May 2, 2013

englis
8. Which of the following options accurately represents the steps involved in the writing process? A. Write first draft, edit, revise, write final draft B. Write first draft, revise, proofread, write final draft C. Plan, write first draft, edit, write final draft D. Plan, ...
May 1, 2013

english
3. Which one of the following sentences best describes paraphrasing? A. Janette listened to the speaker and took notes. B. Janette listened to the speaker, asked questions, and wrote a report. C. Oscar studied Dr. Frost's article and summarized it in his own words. D. ...
May 1, 2013

english
Which group of words is the complete infinitive phrase in the sentence? It is important to avoid harmful exposure to the sun’s direct rays.
April 3, 2013

english
Which word or phrase is an appositive in the sentence? When Sandy met John—a scientist and critic—she fell in love with him.
April 3, 2013

Social Studies
Which state is the least densely populated? 1. Alaska 2. Hawaii 3. Minnesota 4. New Jersey My Answer: # 2 Hawaii
March 19, 2013

Math
Thank You :-D
March 16, 2013

Math
March 16, 2013

Math
Find the surface area of the cone. Use 3.14 for pi 8'' in the bottom and 7'' in the right side
March 16, 2013

Math
Here is a other 1 is that OK Damon????
March 16, 2013

Math
OMG, Damon Thank You So Much!!!!! :D
March 16, 2013

Math