Friday
December 2, 2016

Posts by serena

Total # Posts: 255

Math algebra
To find the average of a set of test scores we divide the sum of the test scores by the number of test scores. On her first four algebra tests,Paula wests scored 88,92,97,and 96. Write an equation that can be used to determine the grade paula needs to obtain on her fifth test ...
November 10, 2016

Math comparing
One box holds 16 crayons.Another box holes 24 crayons.Write a sentence using words that compares the crayons in two boxes.
November 9, 2016

Trigonometry
An airplane is 48 miles due north of a town. An airport is 29 miles North-West of the town. It is determined that the airplane is 34 miles from the airport. On what bearing should the pilot fly to get to the airport? Please show work if possibly, I'm having a hard time ...
November 6, 2016

Math
Fractions between 2/11 and 1/2
October 13, 2016

Social Studies
Can someone check my responses please? I want to make sure I'm correct before submitting. The * is my response 1. How does the Pledge of Allegiance to the flag of the United States reflect the concept of natural rights? A. The Pledge of Allegiance includes the phrase "...
August 22, 2016

Social Studies
"We hold these truths to be self evident, that all Men are created equal, that they are endowed by their Creator with certain unaliable rights,..." -The Unanimous Declaration of the Thirteen United States of America Which of the following best paraphrases this ...
August 21, 2016

Differential Calculus
A clock has hands 1 and 1 3/5 inches long respectively. At what rate are the ends of the hands approaching each other when the time is 2 o'clock?
May 12, 2016

drivers education
#12 is D
May 12, 2016

Differential Calculus
Oh yes. Sorry sir. i just got confused. Thank you :)
May 11, 2016

Differential Calculus
But where did the a=5h come from?
May 11, 2016

Differential Calculus
The base of an isosceles triangle is 10 feet long and the base angles are decreasing at a rate of 2° per second. Find the rate of change of the area when the base angles are 45°.
May 11, 2016

Healthcare Statistics
No choices given. I am at a complete loss at where to begin with this problem.
April 25, 2016

Healthcare Statistics
using the following information, determine if the differences between the means are significant medical terminolgy class. Group A = number of word elements remembered by students using flash cards, group B= number of word elements remembered by students not using flash cards. ...
April 25, 2016

Healthcare Statistics
Given the following p values, which would be considered more significant? p ¡Ü 0.3 p ¡Ü 0.02 p ¡Ü 0.25
April 25, 2016

L.A.
I took it and got a 100. It's 1-b. 2- a. 3-d
April 15, 2016

Technology
1. Who is an upstander? A. the person doing the bullying B. the person being bullied C. the person watching the bullying D. the person who tries to stop the bullying** 2. Which of the following is a place where cyberbullying DOESN’T occur? A. chat messages B. online ...
March 10, 2016

la
I agree
March 6, 2016

Math
Thanks
March 3, 2016

Math
1. Which of the following is a possible measure of the area of a square rug? A. 18 square feet B. 24 square feet C. 36 square feet** D. 48 square feet 2. Based on your answer to the precious question, what would the length of one side of the rug be? A. 4 feet B. 6 feet** C. 8 ...
March 3, 2016

Science
It is excretory because the Exretory system removes toxins and wastes. All this information can be found by look up "what is the excretory system do" or just "Exretory system". I think you might go to Texas connection academy because I recently took this ...
January 14, 2016

diameter/kg
I got 0.2669 but wrong also
January 4, 2016

diameter/kg
What is the mass of water required to fill a circular hot tub 3.4 m in diameter and 1.4 m deep? Answer in units of kg.
January 4, 2016

history
3. All of the following aided in the decline of the Incan Empire EXCEPT (1 point) A. being conquered by the Mayans. B. Francisco Pizzaro's trap that helped capture and kill the Incan emperor and his men. ---- C. that the Spanish had superior weapons. D. that the Spanish ...
September 21, 2015

history
3. All of the following aided in the decline of the Incan Empire EXCEPT (1 point) A. being conquered by the Mayans. B. Francisco Pizzaro's trap that helped capture and kill the Incan emperor and his men. C. that the Spanish had superior weapons. D. that the Spanish brought...
September 21, 2015

history
1. The Inca's huge empire was located in which mountain chain? (1 point) A. Rocky Mountains B. Alps C. Andes----- D. Amazons 2. The Incan people believed their emperor was related to whom? (1 point) A. Cuzco B. Quipo C. the god of Earth D. the sun­god----- 3. All of ...
September 21, 2015

Calculus
What would the limit be for the following problems? lim (square root (x+3)) x--> 1 I thought it would be 1.4 lim (1/x) x--> 7 I thought it would be 0 or .1 but neither of those show to be correct. Thank you!
August 22, 2015

Math
nvm. i figured it out :)
July 21, 2015

Math
The difference between two numbers is 45. Three times the larger number less five times the smaller number equals 75. What are the two numbers?
July 21, 2015

Stats
Makers of a new pain-relieving medication claim that it relieves chronic pain faster than the current top-selling pain reliever on the market. A double-blind experiment was conducted in which 10 people who experience chronic pain were randomly selected to take either the new ...
May 10, 2015

Chemistry
Why does AgCl dissolve in NH3 but AgBr and AgI don't? KSP of AgCl = 1.8 x 10-10 KSP of AgBr = 5.0×10–13 KSP of AgI = 1.5 x 10-16
April 26, 2015

Precalculus
A rancher wishes to fence in a rectangular plot of land and divide it into two corrals with a fence parallel to two of the sides. If she has 300 yd of fencing available, how large an area can the plot have? This is what I have so far: A=xy 300=2x+3y
April 15, 2015

Thanks Alexis, I got 4/4
March 18, 2015

chemistry
How many moles of hydrogen would be obtained if 2.7g of aluminium reacts with excess hydrochloric acid?
March 5, 2015

Trigonometry
Find exact value of each expression sec^-1 (2root3) / 5 I have no idea what to do to make that into a value. I know that sec^-1 is in quadrants one and two, but I'm not sure how to use that to solve the problem. Thank you!
February 12, 2015

Science
i think D
January 29, 2015

physics
An object having a net charge of 18.2 μC is placed in a uniform electric field of 790 N/C directed vertically upward, i.e. in the direction opposite gravity. What is the mass, in grams, of this object if it "floats" in the field? (Assume g = 9.80 m/s2.)
January 21, 2015

physcis
Two small beads having charges q1 and q2 are fixed so that the centers of the two beads are separated by a distance d shown in the figure. A third small bead of charge q=10.0 x 10-9 C is placed between both charges a distance x from q1. a) If q1 = 31.0 x 10-9 C, q2 = 26.0 x 10...
January 17, 2015

math- weighted averages
.3n + .5(500+ n)=300 n = 62.5ml .3n +.5(500 + n) =300 .3n + 250 + .5n = 300 .8n + 250 =300 .8n = 50
December 8, 2014

physics
A harmonic wave is traveling along a string. If the oscillator that generates the wave completes 23 vibrations in 18.50 seconds and if it takes a crest 20.21 seconds to travel 168 cm along the rope. What is the wavelength of the wave? Answer in cm.
November 24, 2014

Physics
In a horizontal spring-mass configuration, the position of the 0.52 kg mass is described by [x = (1.09 m) sin(2.70t)] a) What is in meters the amplitude of these oscillations? b) What is in m/s the maximum speed of the mass under these conditions? c) What is in Joules the ...
November 12, 2014

physics
The position of a 0.31 kg object attached to a spring is described by [x = (0.85 m) sin(2.37πt + 0.35)] a) What is the amplitude of oscillations in m? b) What is in meters/second the maximum speed of the oscillating object? Answer in meters/seconds . c) Find in meters/...
November 11, 2014

physics
The position of a 0.43 kg object attached to a spring is described by [x = (0.49 m) cos(1.25πt)] a) What is the amplitude of oscillations in m? b) What is in meters/second the maximum speed of the oscillating object? Answer in meters/seconds . c) Find in meters/second the...
November 11, 2014

physics
Two masses are connected by a light string passing over a frictionless pulley as shown on Figure. The M2= 6.1 kg mass is released from rest at height h = 2.8 m . We are given that M1=2.7 kg and I, the moment of inertia of the pulley is I = 0.198 kg m2 and its radius is R = 0....
November 4, 2014

Physics
A solid sphere of mass 2.07kg rolls up an incline with an inclination angle of 24.40°. At the bottom of the incline, the center of mass of the sphere has a translational speed of 2.80m/s. a) What is in J, the linear kinetic energy of the sphere at the bottom of the incline...
November 4, 2014

Physics
Consider the rods plus disc system shown in the Figure. The rod has a length L =0.50 m, and mass M = 0.270kg. The large disc has a radius of R = 0.130m and mass m=0.810kg. The second disk should be treated as a point mass of 0.405kg. It is glued to the rod at position X = 0....
November 3, 2014

physics
An m=150 g block hits an M= 265 g block initially at rest on a horizontal surface. After impact they stick together and slide 7.47 m before coming to rest. The coefficient of friction between blocks and surface is 0.39. a) What is in m/s the speed of both blocks immediately ...
November 1, 2014

physica
Consider the rods plus disc system shown in the Figure. The rods are identical. They have a length L =0.50 m, and mass M = 0.250kg. The disc has a radius of R = 0.130m and mass m=0.750kg. Both rods are glued to the disk as shown with X = 0.25m. The system behaves as a compound...
October 28, 2014

Physics
A block of mass 11.2 kg slides from rest down a frictionless 24.0° incline and is stopped by a strong spring with a spring constant 31.3 kN/m (note the unit). The block slides 8.90 m from the point of release to the point where it comes to rest against the spring. When the...
October 25, 2014

AP Chem
Sorry if I was being unclear. Yes, this is an experiment that I conducted. We calculated the temperature change between one reactant and when the reaction occurred. The first reaction had a temp change of 12.5, the 2nd had 1.10, and the third had 5.8 degrees C. I've also ...
October 13, 2014

AP Chem
Reaction 1: NaOH + HCL --> H20 + NaCl delta H of -100.332 kj/mol Reaction 2: NaOH + NH4Cl --> NH3 + H20 : delta H of 358.639 kj/mol Reaction 3: HCl + NH3 --> NH4Cl : delta H of -51.701 kj/mol Use your answers from question 2 above and Hess's law to determine the ...
October 13, 2014

Calculous Pre
A population grows from 11,000 to 15,000 in three years. Enter your answers to three decimal places. Assuming the growth is exponential, find the growth rate and continuous growth rate Growth rate ______ %? Continuous rate _________ %?
October 3, 2014

English (Grammar)
Would it be grammatically correct to say "Lastly, the Puritan values of appeasing towards God in every thing they do..." or "Lastly, the Puritan values of appeasing God in every thing they do..." I'm thinking the second one is grammatically correct but ...
September 4, 2014

Science
A.) A runner is jogging at a steady 6.7 km/hr. When the runner is 3 km from the finish line, a bird begins flying from the runner to the finish line at 20.1 km/hr (3 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the ...
August 28, 2014

chemisty
Hi, I'm a 10th grade student and this is how I would look at it... So what is being oxidized is what is losing electrons. So take Copper for example. Copper is going from a 1+ charge to no charge as a solid...so is it gaining an electron or losing. Now think of Iron. Iron ...
June 6, 2014

Algebra
Hi, I'm a 10th grade student and this is how I think the problem would be solved... So let x = the amount you need to sell .03x = \$420 + .02x .01x = \$420 x = \$42,000 So you would need to sell at least \$42,000 in the first job be equal to the second job. Hope this helps!
June 5, 2014

Chemistry
Never mind, I figured out I needed to convert the moles to grams and then I would use the q = mc delta t.
June 4, 2014

Chemistry
The heat capacity of aluminum is 24.4 J/mol times degrees C. How much energy is released when 5.00 g Al is cooled from 50 degrees C to 30 degrees C. a) 2440 J b) 90 J c) 3.7 J d) 488 J I said A, but the answer sheet says that the answer is B. Can someone please explain how ...
June 4, 2014

Chemistry
I know what I did wrong. Some reason I divided the moles of C10H8 by .0120 instead of .120, so my answer was 11 times the answer it should have been. Thank you very much!
June 4, 2014

Chemistry
I'm really confused on this question so if someone could show the steps and how to get the answer, that would be great. I understand that you would use delta T=Kbm, but don't know how to use the equation to find the answer. Thanks!! Calculate the boiling point of a ...
June 4, 2014

Algebra 1
While playing a game, Rachel pulls two tiles out of a bag without looking and without replacing the first tile. The bag has two colors of tiles--black and white. There are 10 more white tiles than black tiles. a. Write and simplify an expression that represents the probability...
May 28, 2014

Algebra 1
the answer for a is x(x+10)/ (2x+10) (2x+9) the answer for b is 0.20
May 27, 2014

Social Studies
All these plp are wrong! Listen i check them all, if you listen to these answers you will get a 3/9!!!! Don't do it! Pick up your book and learn. Just use the book bc you will fail using this. Jiskha should be sued for all this bad behavior and Mrs.sue is not always Mrs....
May 19, 2014

Chemistry
Ok, I think I get it. Thank you both very much!
May 8, 2014

Chemistry
I'm still a little bit unsure. The website didn't really specify why the ions disassociate with each other and associate with hydrogen bonding
May 8, 2014

Chemistry
So I am trying to understand in molecular terms the solubility of NaCl in water. So there are intramolecular forces that are mostly ionic between the ions, creating this partial positive, partial negative substance. And the intermolecular forces are also ionic. Ionic forces ...
May 8, 2014

English
Dr. Seuss is an authorwhovis famous for his original and clever children's book
April 30, 2014

History
Both Hitler and Churchill were gifted orators. Compare their styles. I was thinking something like that they both used nationalism to make themselves popular within the people. And they spoke to create nationalism in their country. Does this make sense and also how do their ...
April 23, 2014

Math 10
Algebraically, determine the vertex form of a quadratic relation, if the vertex is at (-1, 2) and the point (1, -10) is on the parabola. Show all of your steps. I know that the formula is y=a(x-h)suared+ k but how do i apply these numbers to this formula? Thank you!
April 22, 2014

Math 10
April 13, 2014

Math 10
Hello, Is there easiest and simplest way to do this question? "A baseball is thrown from the top of a building and falls to the ground below. The height of the baseball above the ground is approximated by the relation h = -5t2 + 10t + 15, where h is the height above the ...
April 13, 2014

English
March 24, 2014

English
I have an essay and this is one part of my thesis... "In the nineteenth century, some ways the middle class participated in revolutions was by establishing liberalism, one way was through literature, and through the revolutions of 1848." I wasn't sure if the &...
March 24, 2014

Lit
Ok, I'll edit it. Thank you!
March 24, 2014

Lit
I have an essay and this is one part of my thesis... "In the nineteenth century, some ways the middle class participated in revolutions was by establishing liberalism, one way was through literature, and through the revolutions of 1848." I wasn't sure if the &...
March 24, 2014

Chemistry
Ok, makes sense. Thanks!
March 19, 2014

Chemistry
In a heating and cooling curve, I understand that the flat part means that the bonds are either forming or breaking, depending on if the input of energy is increasing or decreasing, but what is happening to the bonds in the slanted parts? Thanks!
March 19, 2014

Chemistry
I have discovered a new chemical compound with the formula A2B. If a saturated solution of A2B has a concentration of 4.35x10-4M. a) What is the concentration of B2- ions? b. What is the concentration of A1+ ions? c. What is the solubility product constant for A2B? Can you ...
March 16, 2014

Chemistry
What number is the rate ?
March 2, 2014

Chemistry
Did anyone end up getting this. if you plug in the numbers above you still need the retain rate to find k. How do you do that??!!
March 2, 2014

Chemistry
An atmospheric scientist interested in how NO is converted into NO2 in urban atmospheres carries out two experiments to measure the rate of this reaction. The data are tabulated below. A: [NO]0 = 9.63 × 10-3 M, [O2]0 = 4.1 × 10-4 M t(s) 0/3.0/6.0/9.0/12.0 [O2] 4.1/...
March 2, 2014

Chemistry
Are cold alkalis the same as bases? If not, then what is the difference? Can you also give some examples if they are not the same? Thanks!
February 24, 2014

Title
Okay, thank you!
February 17, 2014

Title
Hi I need help thinking of a title for my graphic novel. It is about India and its exploitation of children. Could someone help me think of a cool title and an idea to make the title look unusual. Like maybe a bleed or something. Thanks!!
February 17, 2014

Algebra II
1. 4^x - 3(4^-x) = 8 I got where 4^x = 4 + square root (19), but I can't solve further. The answer is (log (4 + root (19)) ) / (log 4). 2. log (x^2) = (log x)^2 Solve for x Thanks!
February 15, 2014

Math
A rectangular box has a length of 12 inches and a width 4 inches. The length of the three-dimensional diagonal of the box is 14 inches. What is the height of the box?
January 30, 2014

Math
A rectangular box has a length of 12 inches and a width 4 inches. The length of the three-dimensional diagonal of the box is 14 inches. What is the height of the box?
January 30, 2014

Math
A 12-foot ladder is set up 5 feet from the base of a building. How far up the building does the ladder reach? Round your answer to the nearest tenth of a foot.
January 30, 2014

calc
If z = 2cis 60°, find z^4 in rectangular form.
January 28, 2014

Math
thanks people
January 22, 2014

math
Yes, you are right. Use distribution and multiply each number in the parenthesis aka the "10x" and "-12" by -3. So it would be 10x(times -3) - 12(times -3) -30x - -36 -30x + 36 Thats your answer. Hope this helps! Serena, a 10th grade student
December 17, 2013

Math
1. So you know that the slope intercept form is y=mx+b, right. And m is the slope. So in this case there is no straight out coefficient, but x is also equal to 1x. Therefore one is your slope. 2. So first bring -6 to the opposite side of the equation by adding 6 to each side. ...
December 17, 2013

Chemistry
Do pipettes blow up like balloons when they are heated. Why or why not?
December 16, 2013

Chemistry
Oh sorry. The actual question is... Explain what happens at the molecular level for something to dissolve.
November 17, 2013

Chemistry
How could 2 molecular compounds react to create a precipitate and an aqueous solution?
November 17, 2013

Math
If you are describing a graph that consists of a parabola and a line that intersect at two points, would the system be dependent and consistent. Or is dependent only used if the system has an infinite amount of solutions? Thanks!
November 14, 2013

Essay Title
Hi. I need help thinking of a title for the essay I am writing. The essay is about the Dominican Republic and Trujillo's regime. Specifically I am talking about how women who accept/deny female stereotypes accept/deny male domination. Can someone help me thing of a title. ...
November 11, 2013

college essay
Here's another one for editing papers. Your paper was well-written btw. Hope you make it in! I can't paste the link in so if you go to Paper Rater's website, that could help.
November 10, 2013

Math
So substitute one of the x values in x. For example, substitute -3 for x f(x)=-(-3)+4 f(x)=3+4 f(x)=7 Therefore one of the values for y is 7. Do that for the rest of the x values and you will get the answers. Hope this helps!
November 7, 2013

math
So first what you want to do it two put the numbers in order from least to greatest. 1, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 7, 16 So to find the mode you want to see which number is listed the most. That would be 4. To find the median you want to find the middle number of this ...
November 7, 2013

Magic Thesis Statement
I am trying to argue that most weak women in the Dominican Republic during Trujillo's obeyed male domination. While the strong women would manipulate gender context to get what they want or to defy the power hierarchy.
November 7, 2013

1. Pages:
2. 1
3. 2
4. 3
5. Next>>