Saturday

February 25, 2017
Total # Posts: 1,395

**Statistics**

Scores on the Scholastic Aptitude Test form a ND with a mean of 500 and SD of 100 what is the minimum score necessary to be in the top 15% of the SAT distribution? Stuck on what to do on this question? Any answers?

*May 19, 2015*

**Calculus**

Find the x-coordinates of any relative extrema and inflection point(s) for the function f(x) = 3x^(1/3) + 6x^(4/3). You must justify your answer using an analysis of f '(x) and f "(x). I found the first and second derivative which i think is (8x+1)/(x^(2/3), and the ...

*May 18, 2015*

**Calculus**

The position function of a particle in rectilinear motion is given by s(t) s(t) = t^3 - 9t^2 + 24t + 1 for t ≥ 0. Find the position and acceleration of the particle at the instant the when the particle reverses direction. Include units in your answer.

*May 18, 2015*

**Calculus**

The table below shows the temperature (in °F) t hours after midnight in Phoenix on March 15. The table shows values of this function recorded every two hours. (10 points) a. Estimate the value of T'(6). Give units in your answer. b. What is the meaning of T'(6)? t ...

*May 15, 2015*

**Caclulus**

Find f'(x) for f(x) = ln(x^3 + e^(4x)). I got(4e^(4x)+3x^2)/(e^(4x)+x^3) Is that right?

*May 15, 2015*

**Caclulus**

Sorry it is sin^3(3x^2)

*May 15, 2015*

**Caclulus**

Find f'(x) for f(x) = sin3(3x2).

*May 15, 2015*

**science**

Is glycerol a fat, carbohydrate or protein?

*May 10, 2015*

**Math**

Given Perimeter of triangle is 26 inches. Side A is 3 inches longer than B. Side C is 1 inch shorter than twice side B

*May 10, 2015*

**algebra 1**

so im right?

*May 2, 2015*

**algebra 1**

Find the roots of y=x^2, axis of symmetry and vertex. I got roots: (0,0) axis of symmetry: minimum point x=0 vertex: (0,0)

*May 2, 2015*

**math**

Ryans limo drove 24 miles east and then drove 50 miles south How far is the limo from where he started round to nearest tenth

*April 29, 2015*

**Math**

A monopoly has a total cost function C = 1000 + 108x + 12x^2 for its product, which has demand function p = 324 − 3x − 2x^2. Find the consumer's surplus at the point where the monopoly has maximum profit. (Round your answer to the nearest cent.)

*April 22, 2015*

**english**

It was risky for Superman to announce that he could leap over a building in a single bound because he’d been really ashamed if he missed and went splat into the side of the building.

*April 17, 2015*

**Social studies**

9 is A

*April 16, 2015*

**physics**

A 4.0kg particle collides with a 6.0 kg particle that is at rest at 10m/s. What is the velocity of the particles after the collision

*April 13, 2015*

**Math (Please help ASAP)**

How do I solve this equation (q+p^2-33p=9) for the point of elasticity in terms of p? Thank you!

*April 8, 2015*

**physics**

a skier decides to ski down a hill inclined at 12 degrees to the horizontal. He pushes on his poles and starts to slide down the slope. If his initial speed after he stops pushing is 4.7 m/s and us= 0.28, how far will mr.grewal slide down the hill before coming to rest

*April 6, 2015*

**Physics**

If a ball is launched into the air vertically with a velocity of 20 m/sec, how fast will it be moving after two seconds? (The gravity's acceleration is rounded to 10 m/sec/sec.)

*March 26, 2015*

**Calculus**

Find the elasticity of the demand function: pq = 42 p=$2 My professor went through this lesson really fast and I would appreciate anyone's help in explaining it. Thank You

*March 25, 2015*

**Elasticity Demand Calculus**

Find the elasticity of the demand function: pq = 42 p=$2 My professor went through this lesson really fast and I would appreciate anyone's help in explaining it. Thank You

*March 25, 2015*

**Implicit Differentiation (Please HELP)**

Write the equation of the line tangent to the curve x^2 − 4y^2 + 192 = 0 at (8, 8) Thank You

*March 24, 2015*

**math**

Beans meal is 16% protein flour meal is 8% protein. How many pounds of each should be mixed together to get 32 pounds mixture that is 13% protein how many pounds of the flour meal should be in the mixture

*March 20, 2015*

**Math**

If the total cost function for producing x lamps is C(x) = 90 + 36x + 0.1x^2 dollars, producing how many units will result in a minimum average cost per unit? PLEASE EXPLAIN YOUR WORK Thank you

*March 9, 2015*

**Calculus Chain rule**

y = (6x^2-6)^4/x I would appreciate it more if work was shown. Thank you (I have the answer but want to know how to do it)

*February 25, 2015*

**physics**

what is the amount of force needed to move an object that has a mass of 2.0kg at an acceleration of 3.0m/s^2 with the force acting on the object at a 30 degree angle

*February 25, 2015*

**chemistry**

thanks for taking a look! :)

*February 24, 2015*

**chemistry**

How do I calculate the average Z molar mass, 1/n (Summation) of n*M given this data: (alternate equation: MZ=Summation N*M^3/Summation N*M^2) (Ave molar mass, mass of sample): (7.5,9.6) , (12.5,8.7), (17.5, 8.9), (22.5, 5.6), (27.5, 3.1), (32.5,1.7) mili moles for repective ...

*February 24, 2015*

**chemistry help!!**

How do I calculate the average Z molar mass, 1/n (Summation) of n*M given this data: (Ave molar mass, mass of sample): (7.5,9.6) , (12.5,8.7), (17.5, 8.9), (22.5, 5.6), (27.5, 3.1), (32.5,1.7) mili moles for repective numbers: 1.3,.7,.51,.25,.11,.052 TOTAL: 2.92 I don't ...

*February 24, 2015*

**physics/chemistry**

mistake, multiplying by 2 in the math is for a bubble and not a cavity >_>

*February 22, 2015*

**physics/chemistry**

how does one calculate the work done by a spherical bubble with radius r in a liquid with a surface tension of T. I understand for a cavity it is 8pi(r)T, would you just double it to get 16pi(r)T because there are 2 films? here's the math....2(4pi((r)+dr)^2 -4pir^2) for a ...

*February 22, 2015*

**Math Ms Sue**

a book with an area of 88 square inches. what would the length and width of the book.

*February 18, 2015*

**Calculus Chain rule**

How did you get an exponent of 6??

*February 17, 2015*

**Calculus Chain rule**

How can derive this function?f(x) = 2/(9x^5+1)^5 The answer is The answer is -450x^4/(9x^5+1)^6 Can you please show why? Thank you

*February 17, 2015*

**Math**

Three eighths of the cast in a musical have to sing. What fraction of the cast does not have to sing?

*February 12, 2015*

**chemistry**

given relative permitivity of water, how much energy (kj/mol) is required to break the hydrogen bond in water? (Er=80.0)

*February 8, 2015*

**Vectors/Scalars?**

the dot product of 2 vectors is always a scalar. the difference between the two is that the scalar doesn't have direction, yes.

*February 8, 2015*

**chemistry**

how do I calculate the area occupied by one single molecule, given # of molecules per meter^2 (9.6e15), the Molarity? (.1 m/dm^3) and surface excess? (1.6e-8)

*February 8, 2015*

**phys chem**

how much energy (kj/mol) is required to break the hydrogen bond in water (Er=80.0) (Er= Relative permitivity) I'm really not sure how to approach this, and if i need enthalpies of vaporization or not...

*February 8, 2015*

**algebra**

A simple random sample is drawn from a normally distributed population. The value of which of the following will not be known for certain but can be inferred?

*February 5, 2015*

**math**

Nvm i got it right. it was 1.73

*February 2, 2015*

**math**

what numbers when you multiply together give you a product of -3 and a sum of 0? if you don't know, just tell me

*February 2, 2015*

**English close reading paper**

Is it appropriate to use the "we" form and "I" in the same paper?

*January 29, 2015*

**math**

In a box there are 20 balls.7 of the balls are white. The first ball drawn from the box is white. What is the probability that the second ball will be white

*January 8, 2015*

**Language Arts**

i think its b

*January 8, 2015*

**pacific rim**

Mrs Garcia had 2/3 of a pumpkin pie left.Her sons at 3/8 of what was left. What fraction of the whole pie did her sons eat? 2/3*3/8=6/24

*January 7, 2015*

**Math**

Zach had to make bracelets for Student Council. He made 10 of them on Monday and 2/5 of them on Tuesday. Zach completed the remaining 1/2 on Wednesday. How many bracelets for Student Council did Zach have to make? Tuesday = 2/5 = 4/10 of the total. Wednesday = 1/2 X 3/5 = 3/10...

*December 15, 2014*

**math**

Work is incorrect. See details below. a) a+c=1850 and $7.50a+$4.50c=$10,125. Substitute a=1850-c which gives 7.50(1850-c)+4.50c=10,125 13,875-7.50c+4.50c=10,125 3.00c=3,750 c=1,250 a=1,850-1,250=600 b) 10,125x16=$162,000 c) F=full size football M=miniature football F+M=6,000 $...

*December 15, 2014*

**language arts**

that website is good because it's organized the story.

*December 15, 2014*

**Algebra**

How do you sole the problem below? Kevin flies a plane against a headwind for 5600 miles. The return trip with the wind took 10 hours less time. If the wind speed is 5 mph, how fast does Kevin fly the plane when there is no wind?

*December 14, 2014*

**Algebra**

How long would it take for a ball dropped from the top of a 256-foot building to hit the ground?

*December 10, 2014*

**statistics**

34

*November 30, 2014*

**ashworth**

Asian emphasis on the value of filial piety may be note in ?

*November 19, 2014*

**Math**

Yes, it is I again, with yet another math problem. The question is; In a bag, there are 8 white marbles, 8 blue marbles, 7 red marbles, and 6 yellow marbles. How many marbles does it take to pull out 3 marbles of the same color. (A)6 (B)9 (C)12 (D)15 (E)I forgot the last one I...

*November 16, 2014*

**Math**

I am in 6th grade but to me, that doesn't matter because I have high hopes for myself. My question is; How many distinct letter arrangements can be made from the word LETTER with each T on each side? (A) 6 (B) 12 (C) 24 (D) 120 (E) 720 I think it is 24 because if an ...

*November 15, 2014*

**Economics**

Hamburgers supply and demand puzzle

*November 15, 2014*

**Math**

This question was confusing, but I came up along with help from Google calculator and an inverse trigonometric calculator, that (A) is around 4 degrees and (B) is around 15 meters (to the hundredth degree is 14.96).

*November 15, 2014*

**math fractions**

32/45

*November 15, 2014*

**Science 8 - Check Answers**

How is a parallel circuit different from a series circuit?

*November 14, 2014*

**Calculus**

Find the equation of the line tangent to the function f(x)= square root of (x^3 + 4x) through the point (2,4)

*November 14, 2014*

**Geometry**

A square piece of cardboard, 24 inches by 24 inches, is to be made into an open box by cutting out each of the four corners. Each side of the box will then be folded up. Find the maximum volume that the box can hold.

*November 13, 2014*

**math**

the surface area cost of construction per m^2 for a large box is $50 for the base, $60 for the top and $40 for the walls. Find the dimensions of this box that minimize the cost if its volume has to be 9m^3 and its height, 1m

*November 12, 2014*

**what is the rate of change of the angle of eleva**

An observer is 20 m above the ground floor of a large hotel atrium looking at a glass-enclosed elevator shaft that is 20 m horizontally from the observer (see figure). The angle of elevation of the elevator is the angle that the observer's line of sight makes with the ...

*November 10, 2014*

**calculus**

An observer is 20 m above the ground floor of a large hotel atrium looking at a glass-enclosed elevator shaft that is 20 m horizontally from the observer (see figure). The angle of elevation of the elevator is the angle that the observer's line of sight makes with the ...

*November 9, 2014*

**Physics**

the upward force is 16760N while your two downward forces are 1080N and 13832.1N that comes from gravity x mass. Subtract the two then divide by the mass of the submarine

*October 23, 2014*

**physics**

A car accelerates uniformly from rest to a speed of 73.6 mi/h in 7.68 s. How do i find the distance the car traveled during this time, in units of m

*October 22, 2014*

**physics**

A car accelerates uniformly from rest to a speed of 73.6 mi/h in 7.68 s. Find the constant acceleration of the car. Answer in units of m/s 2

*October 21, 2014*

**tech math**

how to solve one pulley is 7 cm larger in diameter than a second pulley. the larger pulley turns at 80 rpm, and the smaller pulley turns at 136 rpm. what is the diameter of each pulley

*October 19, 2014*

**Calculus**

That silly quotient rule! Thanks.

*October 19, 2014*

**Calculus**

Find f''(1/2) using f(x) = ln(1-x). f'(x) = 1/(1-x) * -1 = -1/(1-x) so then using quotient rule: f''(x) = ((-1*-1) - ((1-x)(0))) / (1-x)^2 f''(1/2) = 1/(1-(1/2))^(2) = 4 Is this correct?

*October 19, 2014*

**Calculus**

This is great, thank you!

*October 19, 2014*

**Calculus**

What is the derivative of (ln(x))^x ? I have: f(x) = ln(x)^x f(x) = xlnx f'(x) = x/x + 1 * ln(x) f'(x) = 1 + ln(x) Is this correct?

*October 19, 2014*

**english**

Identify Prepositional Phrases: Last summer our whole family hiked up a mountain.

*October 18, 2014*

**Physics - Second Law Question**

the space shuttle engines cause an upward force of 3 x 10 ^5 N to act on the shuttle. gravity pulls down on the shuttle with a force of 1.96 x 10^5 N. what is the net force on the shuttle? what is the direction of the net force?

*October 15, 2014*

**Physics - Second Law Question**

A large raindrop falling a cloud is acted on by a gravitational force of 4.9 x 10^-3 N directed downward and a force of air resistance of 4.5 x 10^-3 N directed upward. What is the net force on the raindrop? What is the direction of the net force? Thank you so much!

*October 15, 2014*

**Chem Lab Help- Check Urgent**

We had acid base and solid mixture in this experiment. other than these we aren't given anything else. Yes it was an extraction.

*October 12, 2014*

**Chem Lab Help- Check Urgent**

Separation of Unknown Compounds ( this is a lab question. we used ether in this experiment)

*October 12, 2014*

**Chem Lab Help- Check Urgent**

Suggest another solvent you might use instead of ether. Explain your choice giving the advantages and disadvantages of your choice. I said: Toluene Advantages are: -the vapor pressure of Toluene is less -the freezing point is much lower -low polarity -immiscible in water ...

*October 12, 2014*

**Physics Help Please!!!!**

A car is at rest on a horizontal road. What is the value of the frictional force? Explain your answer. A bison stands at rest on the horizontal ground. What is the value of the frictional force? Explain. The normal force always has a direction perpendicular to the surface that...

*October 9, 2014*

**Chem Help Please!**

You are provided with 5 M solutions of sodium hydroxide and hydrochloric acid for use in this experiment (Separation). How you would have prepared these solutions. Thanks!

*October 8, 2014*

**Chem Lab Help**

You are provided with 5 M solutions of sodium hydroxide and hydrochloric acid for use in this experiment (Separation). How you would have prepared these solutions. Thanks!

*October 8, 2014*

**Engineering Calc.**

Water is leaking out of an inverted conical tank at a rate of 6700.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 7.0 meters and the diameter at the top is 4.0 meters. If the water level is rising ...

*October 7, 2014*

**Intro Physics - Newton's third rule**

a piano mover raises a 1000 N piano at a constant speed using a very light rope in a frictionless pulley system. with what force is the mover pulling down on the rope? Show steps please! Thank you!

*October 7, 2014*

**Chem Lab Help**

Separation and purification A mixture of benzoic acid, benzaldehyde and butylamine. What kind of experiment should you design to obtain each of the three compounds in a pure state. Just need ideas in order to start this experimental design. Thanks!!!

*October 6, 2014*

**Calculus**

let F(x) = f(2x) and suppose that the derivative of F(x) = x^(2). Find the derivative of f(2x).

*October 5, 2014*

**Calculus**

Thanks!

*October 5, 2014*

**Calculus**

So here is the question: Find and equation of the tangent line to the graph: 4)f(x)=e^(2x) passing through the point (0,0) I find derivative being f'(x) =2e^(2x) Then m = f'(0) = 2 put into point slope formula: (y-y1)=m(x-x1) y-0 = 2(x-0) which comes out to y=2x 0=2x...

*October 5, 2014*

**Calculus**

I have y = sin^2(3^(x)) which I rewrite as y = (sin(3^(x)))^2 I got the derivative using the chain rule as the following y' = 3(sin(3^x))^2 (cos(3x)) (3^(x)(ln(3)) Can anyone confirm whether this is right/wrong? Thanks

*October 5, 2014*

**statistics**

The police department of a major city has found that the average height of their 1,250 officers is 71 inches (μ = 71 in.) with σ = 2.3 inches.

*September 28, 2014*

**statistics**

c. The top 10% of the officers in terms of height also make higher salaries than the shorter officers. How tall does an officer have to be to get in that top 10% group? (I.e. what is the height marking off the top 10 percent?)

*September 28, 2014*

**Physics**

An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm. Her experiment will require photo-electrons of maximum kinetic energy 2.0eV. what frequency of light should be used to illuminate the tungsten?

*September 23, 2014*

**Physics**

What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?

*September 23, 2014*

**Physics**

An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted?

*September 23, 2014*

**Physics**

White dwarf stars have been observed with a surface temperature as hot as 200,000 o C. What is the wavelength of the maximum intensity produced by this star? help please don't know what to do

*September 23, 2014*

**Math**

Pay attention in class

*September 21, 2014*

**science**

YOU COULD HAVE INFORMED ME OF THAT AN HOUR EARLIER!

*September 18, 2014*

**science**

Wow, you make me stay here for nearly an hour to wait for you to answer a question. Thanks. By the way, don't say how you didn't know the answer, you could have informed me of that 50min earlier.

*September 18, 2014*

**science**

a student brings in a piece of moldy bread. which microscope would you use to view the mold? why?

*September 18, 2014*

**science**

a student brings in a piece of moldy bread. which microscope would you use to view the mold? why?

*September 18, 2014*

**Physics**

How many joules of energy per kilogram of rest mass are needed to bring a spacecraft from rest to a speed of 0.77c?

*September 14, 2014*