Friday
July 3, 2015

Posts by TOM


Total # Posts: 1,180

Math velocity
A ball is thrown straight up from the edge of the roof of a 60.0 m tall building. If a second ball is dropped from the roof 2.0 s later what must the initial velocity of the first ball be if both are to reach the ground at the same time?
June 22, 2015

MATH URGENT
find the average rate of change between f(-4) and f(-1) in the function f(x)= x^2+2x-8
June 1, 2015

Calculus
For f(x)=(1-x)/(1+x) and g(x)=x/(1-x) , find the simplified form for f [g(x)] and state the domain
May 27, 2015

Calculus
Use the table below to evaluate d/dx [f[g(2x)]] at x = 1 x 1 2 3 4 f(x) 6 1 8 2 f '(x) 6 1 8 2 g(x) 1 4 4 3 g '(x) 9 5 5 -4
May 27, 2015

Calculus
Which of the following functions is continuous at x = 5? I put a for my answer, could someone please check this? a. f(x)=(x^2-25)/(x+5) b. (x^2-25)/(x-5), x cannot equal 5 20 when x equals 5 c.(x^2-25)/(x-5), x cannot equal 5 0 when x equals 5 d. all of the functions are ...
May 21, 2015

Calculus
So would that mean that it is only the first one?
May 20, 2015

Calculus
Which of the following statements is/are true? I.If f '(c) = 0, then f has a local maximum or minimum at x = c. II.If f is continuous on [a, b] and differentiable on (a, b) and f '(x) = 0 on (a, b), then f is constant on [a, b]. III.The Mean Value Theorem can be ...
May 20, 2015

Calculus
The function's value will always be greater than or equal to the local linear approximation of a function f if, for all x in an interval containing the point of tangency, f " > 0 f " < 0 f ' > 0 f ' < 0
May 20, 2015

Calculus
The function's value will always be greater than or equal to the local linear approximation of a function f if, for all x in an interval containing the point of tangency, f " > 0 f " < 0 f ' > 0 f ' < 0
May 20, 2015

Math
Maya made a sign with area of 48 square centimeters. Use a centimeter grid paper to draw a shape that shows what her sign could look like?
May 20, 2015

Science
Check my answers pls
May 19, 2015

Science
1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A.frequency and wavelength B.wavelength and wave speed C.amplitude and wavelength D.amplitude and frequency 2. ...
May 19, 2015

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

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 dont 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

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

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