# Posts by Bobby

Total # Posts: 726

**Precalculus**

The answer isn't 6 @Steve...

*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*