Monday
December 5, 2016

Homework Help: 2nd Grade

Calculus - please check my work
differentiate each function a) y = cos^3x b) y = sin(x^3) c) y = sin^2 xcos3x my answers: a) y' = 3cos^2 x(-sinx) b) y' = cos(x^3)(3x^2) c) for this one, i don't know which one is correct. i got 2 different answers but i think they may be the same.. im not sure, i ...
Tuesday, June 19, 2012 by Henry

physics
A runner covers one lap of a circular track 40.0 m in diameter in 62.5 s. Suppose initially the runner starts by going in the north direction. Assume the speed is constant for the first half-lap and then constant for the 2nd half-lap. Suppose instead the runner ran these same ...
Monday, June 4, 2012 by cody

math
In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 16% of your total grade, each major test is worth 21%, ...
Sunday, June 3, 2012 by Ashley

9th Grade Algebra
4x^2-11x+3=5x+4 How do I solve this?
Thursday, May 31, 2012 by hockeyfreak2011

Algebra
The final grade for a particular course is calculated by dividing total points earned by total points available. There are 120 points available in the first half of the course, and 140 points in the second half of the course. If a student earns 81% in the first half of the ...
Monday, May 28, 2012 by Vilma

Calculus grade 12
7. Where does the line r = (1, 2, -5) + t (2, -3, 1) meet the plane 2x + 5y - 3z = 6?
Saturday, May 26, 2012 by j

11th grade math
-2x+7+9x-4
Thursday, May 24, 2012 by sky'toria

Physics
A 1.2 kg block is attached to a horizontal 23 N/m spring and resting on a frictionless horizontal surface. The block is set oscillating with amplitude 10 cm and phase constant – π/2. A 2nd block with mass 0.8 kg moving at 1.7 m/s collides inelastically (the blocks ...
Thursday, May 24, 2012 by Erick

algebra
Let cost = 600.00 fixed costs x = set of tiles $11.00 find the profit equation by substituting your equations for R and C P = R -C THE profit made for 26 and 31 tiles per month. 2nd part; use trail and error to find the quanity of tile sets per month yields the highest profit.
Wednesday, May 23, 2012 by plz help

8 grade
27.6 x 5.2 my answer is 138.00 is this right
Monday, May 21, 2012 by codey

8th grade math
how do you solve x+1/10= a whole number
Monday, May 21, 2012 by sam

6th grade history
Where did the mound builders live???
Saturday, May 19, 2012 by Aria

geometry
in a trivia question ;your team answered 32 out of 40 question correctly. the opposing team answered 16 out of 20 questions correctly. was the ratio of correctly answered quesstions to incorrectly questions the same or different for both teams? explain no they were not same ...
Wednesday, May 16, 2012 by marko

6 grade math
Can you help me with this integer problem? -8+6+(-10)+(-2)*(-10) is it 8????
Tuesday, May 15, 2012 by unknown

algebra ll
Need help please.. Identify -7x^3+6x^2+6x+9 Searching for the degree of the first term, 2nd term, 3rd term, 4th term and the degree of the polynomial? I thank you
Saturday, May 5, 2012 by Alexis2

statistics
assume adults have an IQ score that are normally distrubted with a mean of 105 and standard deviation of 20 A) find the percentage of adults that have an IQ between 94 and 116 B) find the percentage of adults IQ exceeding 120 C)Determine the 1st, 2nd, and 3rd quartiles for ...
Friday, April 27, 2012 by VICTORIA

Math
After a Math test, each of the twenty-five students in the class got a peek at the teacher's grade sheet. Each student noticed five A's. No student saw all the grades and no student saw his or her own grade. What is the minimum number of students who scored A on the ...
Thursday, April 26, 2012 by Rezu

Algebra
help me solve this exponential problem P to the 3rd power times q 5 over 2 all over q to the 2nd power times r to the negative 6.
Tuesday, April 24, 2012 by jeremy

physics
3 boys pulling at the end of 3 ropes held together on a knot. one boy pulls with a force of 20 Newton eastward, while a 2nd boy pulls with the same magnitude force northward. in what direction and with what force must a 3rd boy be pulling if his pull of the knot is to be equal...
Wednesday, April 18, 2012 by sarah grace santiago

Physics
Should the wavelengths computed from 2nd order lines be more accurate or more precise than those compute from 1st order lines?
Tuesday, April 17, 2012 by Anonymous

to ms.sue
thank you. how do you know im in 4th grade?
Tuesday, April 17, 2012 by Celest

grade 6 math
how many rectangles can have the perimiter of 46m
Monday, April 16, 2012 by tony

Math 8th Grade
What is the y-int of the graph of 4x+2y=12
Tuesday, April 10, 2012 by Lana Von Monroe

Health: 6th grade
What do you do if someone needs a splint?
Wednesday, April 4, 2012 by Losa

Math
If I missed 24 problems out of 40, what is my grade?
Tuesday, April 3, 2012 by Mattie

Math
Of the 300 tickets 240 were sold to sixth grade studentss What percent of the total number of tickets sold were sold sixth grade students
Saturday, March 31, 2012 by Leslie

6th grade history
how did athens become rich?
Thursday, March 29, 2012 by katrina

6th grade math
35/(2+5)(2^3)-15
Wednesday, March 28, 2012 by Katie

Math
Mathew has received $1 the first week, $3 the 2nd week, $5 the 3rd week and so on until he has received a total of $1 000 000. What amount did he receive the last week?
Thursday, March 22, 2012 by Sim

statistics
Calculate the z-score for each set of data. Determine who did better on her respective test, Tonya or Lisa. Student English Test Grade z-Score Student Math Test Grade z-Score John 82 Jim 81 Julie 88 Jordan 85 Samuel 90 Saye 79 Tonya 86 Lisa 82 Mean 86.50 81.75 St. Dev. 3.42 2...
Thursday, March 22, 2012 by Anonymous

Spanish-2nd answer
¿Qué hace los actores en la ópera de teatro? Los actores juegan unos papeles en la obra de teatro. ¿Qué pasa hacer la semana próxima? Voy a la escuela la semana próxima ¿Qué hiciste la semana pasada? Hice mi tarea ...
Tuesday, March 13, 2012 by Tiffany

4th grade math
what is 5/6 of 288
Monday, March 12, 2012 by zoe

4th grade math
what is 5/6 of 288
Monday, March 12, 2012 by zoe

Chemistry
h2c4h4o4 + 2naoh --> 2h2o + na2c4h4o4 as for the previous question im sorry i forgot to plug the maleic acid in the formula properly. so this ones it ^ .2213 of c4h4o4 used (maleic acid) and .1 M NaOH 1. show the equation for 1st and 2nd ionization 2. find molecular mass of...
Monday, March 12, 2012 by Ruby

Math - HELP !
there are 50 students in the seventh grade , 62 percent of these students are involved in the drama club.how many seventh grade students are in the drama club ?
Saturday, March 10, 2012 by Remy

1st grade
I am helping my little sister. SHe is in the first grade and learning about Abraham Lincoln. Her questions are- 1. What year was Abe president. What year did he die. 2. How old was he when he died? 3. When did he marry ____. Who did he marry. 4. Who made the first flag? 5. ...
Friday, March 9, 2012 by i.am..running.from.myself

Math
ln [5.01E-3] = ln(4.86E-2) - (1.80E-2s-1)(t s) Solve for t. t = 126 s First I did 4.86e-2 - 1.80e-2 and then on my calculator I pressed the 2nd button and then ln and got 1.031. Then I did the same thing to get the ln of 5.01e-3 and divided that by 1.031 but did not get 126 as...
Thursday, March 8, 2012 by Hannah

6th Grade History
What is the crucifixion?
Monday, March 5, 2012 by running.from.myself

6th Grade History
What was Jesus arrested and crucified for?
Monday, March 5, 2012 by running.from.myself

6th Grade Geography
Who ruled after Augustus?
Saturday, March 3, 2012 by running.from.myself

Math for the middle school and elementary teacher
A prof. teaches 2 calc. classes. The first class has 25 students and their mean on the 1st test was an 82. The 2nd class has 15 students and their mean on the same test was a 74. What is the mean on this test if the prof. combines the score for both classes? Is the answer the ...
Tuesday, February 28, 2012 by liz

4th grade
8+4
Tuesday, February 28, 2012 by Leena

stats
20. The sponsor of a local soccer tournament is responsible for writing an article for the local paper announcing the 151, 2nd, and3rdplacewinners. If10teamsareinvitedtothe tournament, and the sponsor wanted to get the article written in advance so it can go out in the next ...
Sunday, February 26, 2012 by tim

arithmetic
An arithmetic n geometric sequence have the same first term 2.with the 2nd term x. the sum of the 3rd term of the AS is equal to the 3rd term of the GS. Give the first 3 terms of both sequences.
Sunday, February 26, 2012 by simphiwe

7th grade science
definition of cell cycle
Thursday, February 23, 2012 by saranghae12

7th grade health
What does anemic mean?
Tuesday, February 21, 2012 by saranghae12

stats
The sponosor of a local soccer tournament is responsible for writting an article for the local paper announcing the 1st, 2nd, 3rd place winners.If 10 teamsare invited to the tournament, ans th sponsor wanted to get the article written in adance so it can go out in the next ...
Monday, February 20, 2012 by tim

physics helpppp!!
The 2nd harmonic of a string of length 40cm and linear mass density 1.11g.m has the same frequency as the 5th resonance mode of a closed pipe of length 1.4m. Find the tension in the string. use 340 for speed of sound
Thursday, February 16, 2012 by joey

statistics
2. The grades on a statistics midterm exam were normally distributed with a mean of 72 and a standard deviation of 8. a. What is the proportion of students received a B grade. b. What is the proportion of students that failed the exam? c. What is the grade of the 92nd ...
Thursday, February 16, 2012 by kabita

emergency physics
The 2nd harmonic of a string of length 40cm and linear mass density 1.11g.m has the same frequency as the 5th resonance mode of a closed pipe of length 1.4m. Find the tension in the string. use 340 for speed of sound
Wednesday, February 15, 2012 by joe

physics
(ignore the other question i posted this is the right one) A rocket has a pre-ignition mass of 1100kg. On ignition it burns fuel at rate of 20kg s-1 producing a thrust of 10000N. How long after ignition of the fuel, will the rocket lift off? also explain how is it possible for...
Wednesday, February 15, 2012 by beavis

physics
A rocket has a per-ignition mass of 1100kgs-1 producing a thrust of 10000N. How long after ignition of the fuel will the rocket lift off? also explain how is it possible for a rocket to accelerate in space. (i cant work it outt. i know it involves the rocket thrust equation ...
Wednesday, February 15, 2012 by beavis

3 grade math
Is a trapezoid also a parallelogram? Explain why or why not.
Tuesday, February 14, 2012 by Dk

6th grade science
what are the four phases of mitosis??? -------,-------,-------,-------
Sunday, February 5, 2012 by kate

math for elementry school teacher
Step 1st: 1 Box Step 2nd: 3 Boxes Step 3rd: 6 Boxes How many boxes in the 354th version? How many in the nth version?
Sunday, February 5, 2012 by deadlove

10th grade Math --Shadow-Pull questions
AC=12 Db=32 AD=x
Sunday, February 5, 2012 by Mike

Reading
What is a 6th grade definition for the word "Seraph"
Monday, January 30, 2012 by Juliana

7th grade science
What are mass extinctions?
Sunday, January 29, 2012 by saranghae12

Physics (Wave Force)
An archer must exert a force of 445 N on the bowstring shown in Figure (a) such that the string makes an angle of è = 34.0° with the vertical. (a) Determine the tension in the bowstring. _____________________________________ My answer was 420.525, but it is within ...
Friday, January 27, 2012 by Anonymous

math
3rd grade create an algorithm that has a difference of 20
Thursday, January 26, 2012 by Ali

6th grade math
how to solve w/3=17
Sunday, January 22, 2012 by Isaiah

12th Grade Calculus
how will you multiply y = ae^3x + be^-2x with dy/dx = 3ae^3x - 2be^-2x
Sunday, January 22, 2012 by Akash

math
in 2nd year Adam owed $ 977.53, in the 3rd year he owed $ 1036.18 and in the 4th year he owed $1098.35 how much was the loan originally, and determine the future value of the loan after 10 years
Thursday, January 19, 2012 by Annie

6th grade math
1/4 * 1/2 =4D
Monday, January 16, 2012 by kirsten

5 th grade algebra
5a-a-2a=18
Saturday, January 14, 2012 by kennady

4th grade math
What are 3/7,1/9,and 2/3 all realated to?
Thursday, January 12, 2012 by Ivana

Psychology
This is part of a paper I am writing.....I need to write about this, however I am confused by the 2nd part of the question. What do you think they are looking for when they state how are we influenced by emotion, framing and narratives? What attributes are inherent in ...
Tuesday, January 10, 2012 by BJ

math
Sorry, Reiny, I copied the 2nd choice incorrectly. I had posted this problem with you before and the answer given that was not equalalent to A=1/2/bh was 2b =A/h. The problem is: A = 1/2bh, which is not equivalent? Choices: 2A =bh, h=2A/b, 2b=A/h, b=2A/h When I got my test ...
Tuesday, January 10, 2012 by Jane

ap calculus ab
for f(x)=lnx we know that f(e)=1. Use the tangent line at(e,1) to compute the tangent line approximation of f(3). what does the difference between the actual value and the tangent line approximation have to do with the concavity (2nd derivative) of the function at (e,1)?
Sunday, January 8, 2012 by Jake

Hardwork I done already! :)
7th Grade 7th grade Grades (1st quarter to 4th quarter): English 7 - 99 Math 7 - 91 Social Studies 7R - 91 Science 7R – 80 Fine Art 7 (advance art) – 100 Strings 7 – 100 Gym 7 and 8 – A GPA: 1st Quarter – 93.50 2nd Quarter – 3rd Quarter – 4th...
Friday, December 30, 2011 by Laruen

Question
I'M CURIOS SO DON'T JUST JUDGE ME AND BE RUDE i'M REALLY CURIOUS AND i FORGOT TO ASKED THIS QUESTION. DO NOT JUDGE ME!!!! Do I start taking SAT's and ACT's in grade 10th or 11th/12th grade???? I'm really curious.
Friday, December 30, 2011 by Lauren

Statistics
2. You are given the following data. Number of Absences Final Grade 0 93 1 90 2 79 3 66 4 60 5 56 - Find the correlation coefficient for the data. - Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days. Show all ...
Friday, December 30, 2011 by Lauren

pre-algebra
find the product: (4k to the 5th power)(-2k)to the 3rd power. 5th power is inside the parenthesis and the 3rd is outside the parenthesis. Is it -32k to the 8th power or -32k to the 2nd power?
Sunday, December 18, 2011 by Linda

math 6th grade
How to write out 10 the negative 6?
Wednesday, December 14, 2011 by Bob

algebra
Hi guys: Can any one please tell me what does this means? Thanks ----------------------------------------​------------------------------ The second matrix is simply the symmetric version of the first. This 1 2 3 4 5 6 7 1 0 2 3 x 2 4 x 2 2 3 11 2 3 5 3 3 9 2 3 5 4 3 9 3 ...
Tuesday, December 13, 2011 by Kathleen

Math Grade 3
what happen when you divide a 3 -digit number by 10
Monday, December 12, 2011 by Hong

Math Grade 3
what happen when you divide a 3 -digit number by 10
Monday, December 12, 2011 by Hong

9th grade math
simplify x^5-x^3+x^2-1-(x^3-1)(x+1)^2/(x^2-1)^2
Wednesday, December 7, 2011 by Anne

Math 4th grade
Input 15 ? 30 10 9 3 1 Output 6 18 3 9 ? 30 90
Wednesday, December 7, 2011 by Diamond

7th grade mayh
Dimensional analysis 4.25L/h to mL/h
Sunday, December 4, 2011 by Anonymous

7h grade math
Deminsional analysis 4.25L/h to mL/
Sunday, December 4, 2011 by Anonymous

history
Techniques for interest groups to reach a wide number of people and influence policy makers and voters include all of the following except _________. publicity and mass mailings offering tax write-offs litigation and amicus curiae briefs protests not sure, can't find it in...
Sunday, December 4, 2011 by Michelle

grade 7 math
which expression is equivalent to (n+10)x5
Sunday, December 4, 2011 by vito

statistics
If Q2 = D5 = Median Which means if the 2nd quartile equals to 5th decile and also the median.. then how do we find out the fourth decile? I mean is there a way to find it out through this? Then what is D4 going to be? I am talking about Deciles here..
Saturday, December 3, 2011 by HM

8th grade science
what does Radium bond with and what are the reactions
Saturday, December 3, 2011 by Anonymous

chemistry
Consider a liquid at 90 bar and 40 °C. What is the change in entropy of the substance as you change the conditions to 1 bar and 150 °C by expanding the liquid while heating? Vapor pressure = 59.2 bar heat of vaporization = 1.82 kJ/mol , both at 150 degree C Heat ...
Saturday, December 3, 2011 by pirate

SAT's and ACT's
How to pass the SAT's and ACT'S for the John Hopkins Talent Search? Here are the grade chart. Awards Ceremony Eligibility Chart (valid for students who tested by June 30, 2011) SAT Grade 7 Math >=550 or Critical Reading >=550 ACT Grade 7 Math >=21 or Reading &...
Friday, December 2, 2011 by Laruen

Physics, Kinematics
You drive with a constant speed of 15.1 m/s for 23.4 s. You then accelerate for 28.7 s to a speed of 25.8 m/s. You then slow to a stop in 37.1 s. How far have you traveled? I've tried dividing this into 3 parts. 1st- constant speed 15.1m/s*23.4s=353.34 m 2nd-accelerating I...
Thursday, December 1, 2011 by Jackie

7th grade math
please help me solve n-16= -23
Thursday, December 1, 2011 by asia

math
Jane is taking a class and asks you to help her figure out what her last grade must be in the class to get a 85 in the class. She tells you the following calculation is used to find your final grade: 75+85+90+X ___________ > 4 x is her last score which has not been taken. ...
Wednesday, November 30, 2011 by Jennifer

math
Jane is taking a class and asks you to help her figure out what her last grade must be in the class to get a 85 in the class. She tells you the following calculation is used to find your final grade: 75+85+90+X ----------- > or = to 85 4 x is her last score which has not ...
Tuesday, November 29, 2011 by Jennifer

algebra
Jane is taking a class and asks you to help her figure out what her last grade must be in the class to get a 85 in the class. She tells you the following calculation is used to find your final grade: w2d2 x is her last score which has not been taken. Explain this equation and ...
Tuesday, November 29, 2011 by Jennifer

math
Jane is taking a class and asks you to help her figure out what her last grade must be in the class to get a 85 in the class. She tells you the following calculation is used to find your final grade: w2d2 x is her last score which has not been taken. Explain this equation and ...
Tuesday, November 29, 2011 by Jennifer

math 4th grade
writing a sequence for the rule a-4=b
Tuesday, November 29, 2011 by joe

differential equations
Solve the following equation explicitly by expanding up to order x5, the following 2nd order diff equation. y''(x) = (1 + x^2)*y(x) pls show working y =f(x)
Tuesday, November 29, 2011 by zac

7TH GRADE MATH
please help solve -5(9K-8) + 2 (8+6K)
Monday, November 28, 2011 by ASIA

Plz Help
You I'm entering this contest Scholastic Arts and Writing Award, and I'm a bit confused so I have to register online, then fill out a form since I'm doing it and mail my art work and writing in???? I check the site but I'm confused. I'm in 7th grade by the ...
Sunday, November 27, 2011 by Laruen

2 grade math
% of 0.66? Answer 66. Am I right
Thursday, November 24, 2011 by Anonymous

MAth grade 8
x+5/6 = 3x-5/8 Solve for x
Tuesday, November 22, 2011 by 17halimk

MAth grade 8
how do you convert 2 4/5 to decimals
Tuesday, November 22, 2011 by 17halimk

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