Monday
March 27, 2017

# Posts by bobby

Total # Posts: 726

Precalculus
March 6, 2017

Precalculus
What is the smallest positive integer $n$ such that all the roots of $z^4 - z^2 + 1 = 0$ are $n^{\text{th}}$ roots of unity?
March 6, 2017

Algebra word problem
It takes john 12 hours to plow a field. After he had been working for 3 hours, his brother Mike came to help. Together they finished the job in 5 hours. How long would it take mike to plow the field working alone? How would I set this problem up in fraction form? And would I ...
March 4, 2017

precalculus, complex numbers
Let $\omega$ be a complex number such that $\omega^7 = 1$ and $\omega \neq 1$. Let $\alpha = \omega + \omega^2 + \omega^4$ and $\beta = \omega^3 + \omega^5 + \omega^6$. Then $\alpha$ and $\beta$ are roots of the quadratic $x^2 + px + q = 0$ for some integers $p$ and $q$. ...
February 22, 2017

Math
A. Can't graph for you, sorry! B. The function is linear, as for every equal change in x, there is a set change in y. C. x increases by 1 every time y increases by 2. (y=2x-1) D. Plug into equation y=2x-1, so we get 20-1=19
February 22, 2017

precalculus
Let $R$ be the set of primitive $42^{\text{nd}}$ roots of unity, and let $S$ be the set of primitive $70^{\text{th}}$ roots of unity. How many elements do $R$ and $S$ have in common?
February 15, 2017

Math
How many three-digit counting numbers are exactly divisible by 6 but not also exactly divisible by 9?
February 13, 2017

English
Why is it difficult? I have never thought about it. Try to say it not in a quick way. Separate the words - hope and full and that is all
February 5, 2017

english
Yes, I also think that variant B is the most general and it must be correct. And by the way, if you need to develop this sentence and write a whole paragraph, you may go to the service I like personally. It is Prime Writing service
February 4, 2017

Math
A pencil costs $3.50 and a pen costs$6.70. Jessica bought m pens. She also bought 4 fewer pencils than pens. Write an algebraic expression for the total amount she spent. The answer supposed to be 6.70m + 3.5 (m-4). I got confused of what to do
February 3, 2017

algebra 1
x = -3 ,-2 ,-1,1,2,3 y= ?
February 1, 2017

algebra 1
write and graph the inverse variation when y=3 and x=2 find k = write the inverse variation fill in the table of values and graph x = -3 ,-2 ,-1,1,2,3 y= ?
February 1, 2017

algebra 1
write and graph the inverse variation when y=3 and x=2 find k = write the inverse variation fill in the table of values and graph x = -3 ,-2 ,-1,1,2,3 y= ?
February 1, 2017

Math
f(x+h)?f(x)=4hx?1h+5h^2. Find f?(x).
January 31, 2017

trig
Thanks....got it
January 21, 2017

trig
Brian is riding a Ferris wheel. The wheel has a radius of 25 feet, and at his lowest point, Brian is 8 feet off the ground. Brian times how long it takes to travel from the lowest point to the highest point and finds that it takes 8 seconds. Write a sinusoidal equation to ...
January 21, 2017

Math
A rectangular football field, including both end zones, is 120 yards long. The field has an area of 57,600 ft.². What is the width of the field in feet.
January 7, 2017

math
Every night when Isabella came home from work she put any change she had in her pockets into a jar. One day she wanted to know how much change she had in her jar. She noticed that she had two more nickels than twice the number of dimes, and eight fewer quarters than twice the ...
January 5, 2017

Math
Help me find p please. (X-3.15)^2=4p(y-219.7981936) Thanks!!!
December 1, 2016

Math
thanks Jamez
November 21, 2016

Math
Michael saves $423 dollars a month for college. About how much will he have saved after 4 years? November 21, 2016 Physics Thank you so much for the help!! Just to double check my math is correct, did you get about 2J as your answer? 2.45 to be exact November 10, 2016 Physics A mass m = 1 kg initially at rest at height h = 2m slides to the bottom of a 45 ramp. there is no friction between the mass and the ramp. At the bottom of the ramp the speed of the mass is 4 m/s. How much heat was generated by the friction as the mass slides down the ramp? Any... November 10, 2016 Physics A motor lifts an elevator of mass m at constant speed. The power output of the motor is P and there are no frictional losses so that all the power output from the motor goes into lifting the elevator mass. What is the correct expression for the time required for the motor to ... November 10, 2016 Physics Searches related to a motor lifts an elevator of mass m at constant speed. The power output of the motor is P and there are no frictional losses so that all the power output from the motor goes into lifting the elevator mass. What is the correct expression for the time ... November 10, 2016 ALGEBRA 2 Let's take this step by step. 1. We can let x = number of apple pies you would make and y= the number of apple cobblers you make. 2. We can make an inequality showing the constraint of apples we need. So: 4x+2y<=16. Done! 3. Next ingredient we would use is flour, so let... October 27, 2016 Math 1     to see this. You should get a pivot in each column. 1 (c) No, they do not form a basis because they do not span P3. (You would need 4 vectors to span P3.) 3. Let M2×2 be the vector space of 2×2 matrices with the usual ... October 25, 2016 Physics When boiling​ water, a hot plate takes an average of 9 minutes and 47 seconds to boil 100 milliliters of water. Assume the temperature in the lab is 75 degrees Fahrenheit. The hot plate is rated to provide 195 watts. How efficient is the hot​ plate? Thanks. October 19, 2016 Math Based on how you phrased the question, 20 percent would be the answer October 17, 2016 Math 9/45 * 100% = ? October 17, 2016 Biology Hi all, Need help with this: What is the difference that you see on a EKG when you have non-transmural MI vs. transmural MI? a) In transmural MI the Q wave is amplified, and the R wave is depleted making the QRS complex look inverted b) In non-transmural, the T wave is absent ... October 17, 2016 Math The cost for 3 dinners plus a 15% tip is$27.60. Write an equation representing the situation if p is the price of the dinner in dollars. You may asssume there is no tax.
September 9, 2016

math
AB = 3x + 9, BC = 4x - 7, AC = 37. What do x and AB equal?
August 29, 2016

PE
True C C
August 21, 2016

Physics
idk sorry fam
July 20, 2016

Physics
A ball is thrown horizontally from the building roof at a speed of 20 m/s. Takes ball 4 seconds to reach the ground. How tall is building? What is the ball’s speed and direction as it contacts the ground? How far from the base of the building does the ball land? Use ...
July 11, 2016

Math
In the NFL, a division consists of 4 teams, each of which plays each other team twice. Assume that in any game, either team is equally likely to win (and there are no ties). What is the probability that, at the end of the season, the division has neither a perfect team with 6 ...
June 17, 2016

math
10 years ago raj deposited $5000 into an investment account with intrest compound quarterly. for the first 5 years the intrest rate was 6% and for the next 5 years the interest rate changed to 4.5% how much money is in the account now June 14, 2016 Chemistry A buffer was prepared by mixing 0.1 M ch3cooh with 0.1M ch3cooNa in the ratio 8:2. Calculate ph after the addition of 2mL of 0.1 M HCl? When you do the 8:2 ratio and add 2 mL of 0.1 M HCl, the buffer is gone and you are left with 1*10^-3 moles of ch3cooh. How would you ... June 2, 2016 Chemistry The acetate buffer were prepared by mixing 0.1 M ch3cooh with 0.1M ch3cooNa in the ratio 8:2 and 2:8. Calculate the resulting ph after the addition of 2mL of 0.1 M HCl to 10 ml of buffer 8:2 and 4ml of 0.1 M NaOH to 10 ml of buffer 8:2. June 2, 2016 Geometry maria is building a carrying case for a musical instrument. The case will have the shape of a triangular prism. She wants to know how much material will be needed to build it. The case will have the dimensions given in the diagram. What is the surface area of the case in ... May 30, 2016 Math 19 students share 6 pizzas each need equal portions how much will each one have? I divided 6 pizzas into 8 pieces which gave me 48 pieces so 6/8 of a pizza April 26, 2016 Maths Tom reads that each seedling he is planting needs an area of 150 square centimetres of garden. Tom has 80 seedlings to plant. What is the total area of garden the seedlings will need? Give the area in A: Square Centimetres or B: Square Metres April 20, 2016 math Write4.1x10 to the 5th power in standard form April 7, 2016 Math What is the range between 58 degrees and -88 degrees March 16, 2016 Physics An airplane has a velocity of v=(5m/s)i + (4m/s)j at t1= 3s. For the time interval from t1=3 seconds to t2=13s the average acceleration is a= (.5m/s^2)i + (.2m/s^2)j. At 13s find the magnitude and direction of the velocity of the airplane. March 13, 2016 Physics A grizzly bear is running at a speed of 25m/s with respect to a man. The man is running 20m/s with respect to a rock. What is the bears speed with respect to the rock. (ALL VELOCITIES ARE IN THE SAME DIRECTION AND POSITIVE) March 13, 2016 Physics A grizzly bear is running at a speed of 25m/s with respect to a man. The man is running 20m/s with respect to a rock. What is the bears speed with respect to the rock. (ALL VELOCITIES ARE IN THE SAME DIRECTION AND POSITIVE) March 13, 2016 Physics An airplane has a velocity of v=(5m/s)i + (4m/s)j at t1= 3s. For the time interval from t1=3 seconds to t2=13s the average acceleration is a= (.5m/s^2)i + (.2m/s^2)j. At 13s find the magnitude and direction of the velocity of the airplane. March 13, 2016 Dynamics A 45ft long conveyor is used to move boxes up to a second level. The belt speed is 150ft/min and the conveyor is inclined at 15 degrees. Boxes are dropped vertically onto the conveyor and have no horizontal speed. The static and dynamic coefficient of friction between the belt... March 10, 2016 math The race was around a circular track for twenty-two laps.Calculate the number of radians a racer would travel from start to finish March 9, 2016 English What roles are played by the female characters you encountered in this unit? Describe some of these female characters, their traits, and the roles they played within the selections you read, especially considering that all of those selections had male characters as protagonists. February 29, 2016 Chemistry A 70.0 mL solution of 0.171 M potassium alaninate (H2NC2H5CO2K) is titrated with 0.171 M HCl. The pKa values for the amino acid alanine are 2.344 (pKa1) and 9.868 (pKa2), which correspond to the carboxylic acid and amino groups, respectively. a) Calculate the pH at the first ... February 28, 2016 Chemistry What volume (in milliliters) of 0.100 M NaOH should be added to a 0.120 L solution of 0.024 M glycine hydrochloride (pKa1 = 2.350, pKa2 = 9.778) to adjust the pH to 2.95? I don't know how to do this problem! Steps with answers please!! HELP!! February 28, 2016 physics Mayan kings and many school sports teams are named for the puma, cougar, or mountain lion Felis concolor, the best jumper among animals. It can jump to a height of 12.2 ft when leaving the ground at an angle of 44.2°. With what speed, in SI units, does it leave the ground ... February 15, 2016 Algebra 2 A right triangle has a 45 degree angle. The hypotenuse is x and the leg is 8. Find the value of x. February 10, 2016 math The length of a rectangle is 8 less than twice the length. If the perimeter of the rectangle is 194 inches, find the dimensions of the rectangle. February 2, 2016 Language Arts Great! Thanks, Ms. Sue! I appreciate it. January 14, 2016 Language Arts Could it be C? January 14, 2016 Language Arts Simile has "like" in it. So, A? January 14, 2016 Language Arts I don't know if it is A or B for the first one... But, for some reason, I'm looking in at B. January 14, 2016 Language Arts Or, could it be A on the first one? January 14, 2016 Language Arts Which of the following answer choices contains a METAPHOR? a. His skin was sandpaper. b. The sun sparkled like a diamond. * c. Sh wanted to be like the birds and fly away. d. They felt free when they ran through the doors. What is a key characteristic of a refrain in poetry? a... January 14, 2016 Algebra Tell whether the lines for each pair of equations are parallel perpendicular or neither. Y= -2x + 4 -5+10y=5 I think perpendicular Next question is same kind- Y=-1/4x+10 -2x+8y=6 I think it's neither December 12, 2015 Algebra Match the equation with its graph -2/3 x - 1/4y = 1/3 December 12, 2015 Physics A light ray in water is directed at the water surface at an angle of incidence at 40 degrees. Calculate the angle of refraction of the light ray at this surface. December 10, 2015 Algebra Flying against the wind, an airplane travels 28 km in 5 hours. Traveling with the win, the same plane travels 3760km in 4 hours. What is the rate of the plane and still air and what is the rate of the wind? November 17, 2015 MATH 6 is one of the common multiples November 17, 2015 Logarithms Solve the following equations for x and check the solution using log. 2^6x-1 = 28 The answer is log56/6log2. Explain each step. November 7, 2015 algebra thank you you helped allot November 3, 2015 algebra thank you November 2, 2015 aarays and expanded algorithm How to get the answer to this problem 37 ×45 October 28, 2015 Lititure How do u write a melcon and rikki-tikki-tavi as a bully September 29, 2015 chemistry 49.5(0.506-x)(0.253-x)=4x^2 How to make it in quadratic equation Please help with step by step. thank u so much September 27, 2015 find the area of the rectangle 84cm And 19cm? September 18, 2015 Writing I want to tell you that you should definitely check the link sent at the previous answer. That helped me too. Also what helped me a lot is an online writing service as Marvelous essay service. You may check it too September 15, 2015 science Do I need the comma after "months" here? Over the past 6 months, OvaScience has been continuously hammered down by short sellers. September 12, 2015 chemistry 3A+2B+2C > 4D+2E 1) what is the rate of this reaction in terms of change of concentration of reactant B? - is it '1/2' ? 2) what is the rate of this reaction in terms of change of concentration of product D? please help September 10, 2015 maths What is the sum of 4x dollars and 4x cents. Express your answer in cents . July 16, 2015 geomery Triangle ABC, inscribed in a circle, has AB = 15 and BC = 25. A tangent to the circle is drawn at B, and a line through A parallel to this tangent intersects line BC at D. Find DC. June 26, 2015 math why is the answer to this problem? 5/3 -5/6 June 10, 2015 Anatomy & Physiology A person is complaining of muscle weakness, numbness, paralysis and pain. Which disorder of the nervous systemis this person most likely experiencing? June 7, 2015 Chemistry I have no idea June 1, 2015 chemistry Water has a density of 0.997 g/mL at room temperature (25 C). If you have exactly 500 mL of water, what is its mass in kg? May 4, 2015 chemistry Bromine is a red liquid at 25°C. Its density is 3.12 g/mL. What is the volume of 28.1 g of liquid bromine? May 4, 2015 Math I need to find what the total commission of 14% on a$3000 sale. Can u please show in detail how to solve this. Please and thank u. :)
April 28, 2015

math
oh I am amy's brother ms. sue
April 28, 2015

math
420? ms. sue?
April 28, 2015

math
The Sugar Sweet Company will choose from two companies to transport its sugar to market. The first company charges $4696 to rent trucks plus an additional fee of$ 225.50 for each ton of sugar. The second company charges $5500 to rent trucks plus an additional fee of$ 175....
April 25, 2015

Physical Science
The answer is FIGURE IT OUT YOURSELF!
March 24, 2015

History
THANKS!!!
February 20, 2015

Maths
Check my answer please? Not sure if I did this right. Let y = f(x) be a cubic polynomial with leading coefficient a = 2 and f(-2) = f(1) = f(2) = 0. find the factored form of f. I got: f(x) = 2(x + 2)(x - 1)(x - 2)
February 18, 2015

statistics
the standard score for hours spent online at home for Minnesotans was 2.84. The mean equals 8.9 hours. Approximately how many hours do Minnesotan adults spend online at home.
February 4, 2015

algebra
michael purchased a certain number of shares of one stock for a total of $1400. The second stock was selling for 6$ less per share. Michael could have brought 3 more shares of the second stock for the same amount of money. How many shares of the first stick did michael ...
February 3, 2015

Algebra
The ratio of the corresponding side lengths of two rectangular tables is 4:5. What is the ratio of the perimeters? What is the ratio of the areas?
January 28, 2015

MATH
you sure
January 12, 2015

Graph Theory/ Algorithms / Computer science
Please delete this post! I have been able to figure it out. Thanks :)
December 17, 2014

Graph Theory/ Algorithms / Computer science
I am working on this problem from the book, Data Structures & Algorithm Analysis in C++. The problem is: 9.40 Give a polynomial-time algorithm that ﬁnds ceil(V /2) vertices that collectively cover at least three-fourths (3/4) of the edges in an arbitrary undirected ...
December 17, 2014

chemistry
It's ground state. So, yes it's D.
December 15, 2014

Chemistry
The heat of combustion of benzene, C6H6, is -41.74 kJ/g. Combustion of 3.65 of benzene causes a temperature rise of 4.41 C^o in a certain bomb calorimeter. What is the heat capacity of this bomb calorimeter? (kJ/C^o) So, I what I did was I multiplied -41.74 kJ/g and 3.65 to ...
December 15, 2014

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