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Posts by tom

Total # Posts: 1,412

JOb interview
here are a few people in line waiting to be served. You are taking care of one customer and she insists you gave her the incorrect change. You know you didn't. What do you do?

alg1
solve for 8m^2 +20m=12 for m by factoring

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?

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

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

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

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 ...

Calculus
So would that mean that it is only the first one?

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 ...

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

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

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?

Science
Check my answers pls

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. ...

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?

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 ...

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.

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 ...

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?

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

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

science
Is glycerol a fat, carbohydrate or protein?

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

algebra 1
so im right?

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)

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

English, pls help ASAP!!
these are the right answers 100% A B B C A

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.)

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.

Social studies
9 is A

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

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!

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

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.)

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

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

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

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

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

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)

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

chemistry
thanks for taking a look! :)

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 ...

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 ...

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

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 ...

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

Calculus Chain rule
How did you get an exponent of 6??

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

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

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

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.

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)

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...

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?

math
Nvm i got it right. it was 1.73

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

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

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

Language Arts
i think its b

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

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...

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 $...

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

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?

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

statistics
34

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

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...

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 ...

Economics
Hamburgers supply and demand puzzle

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).

math fractions
32/45

Science 8 - Check Answers
How is a parallel circuit different from a series circuit?

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

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.

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

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 ...

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 ...

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

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

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

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

Calculus
That silly quotient rule! Thanks.

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?

Calculus
This is great, thank you!

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?

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

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?

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!

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.

Chem Lab Help- Check Urgent
Separation of Unknown Compounds ( this is a lab question. we used ether in this experiment)

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 ...

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...

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!

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!

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 ...

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!

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!!!

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

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