Thursday

July 28, 2016
Total # Posts: 320

**Calculus**

If x^2 + y^2 = 25 and dx/dt = 8, find dy/dt when x=3.
*July 24, 2016*

**Calculus - Differentials**

The diameter of a shpere is measured to be 6 inches with a possible error of 0.05 inches. Use differentials to estimate the maximum error in the calculated surface area. I've gotten this far: A=4pir^2 dA=8(pi)(r)(dr) Since the problem gives me the diameter and the equation...
*July 23, 2016*

**Math**

An observer atop a cliff sees a speedboat approaching a dock located at the base of the cliff directly below the observer. Express the distance, d, from the observer tot he boat as a function of the distance, x, from the boat to the dock, if the cliff is 150 feet high. State ...
*June 24, 2016*

**physics **

A 43.0-kg boy, riding a 2.20-kg skateboard at a velocity of 5.30 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 8.00° above the horizontal. Ignore any ...
*April 19, 2016*

**math**

I did tan =h/517 h=517tan16 h=148.24 h=148ft is this correct?
*April 17, 2016*

**math**

The sun hits a building of unknown height so that the building casts a shadow of 517 feet. If the angle of elevation from the tip of the shadow to the sun is 16 degrees, how tall is the building?
*April 17, 2016*

**Chemistry **

Calculate the theoretical amount of .5M NaOH that it would take to neutralize approx. 2.0 g KHP. KHP is a monoprotic acid, the molar mass of KHP is 204.22 g/mol and the molar mass of NaOH is 40.00 g/mol. Answer in terms of mL. I converted g KHP to mols, then mols of KHP to ...
*March 28, 2016*

**MATH HELP**

The Francesco Company produces spaghetti sauce that is used in restaurants. The fixed costs total $1,329,050. The selling price per 64 oz. can of sauce is $12.40. The variable cost per can is $4.80. What is the break-even point in number of cans?
*March 2, 2016*

**Math Algebra PLEASE EXPLAIN**

THANK YOU TheAnswer!
*March 2, 2016*

**Math Algebra PLEASE EXPLAIN**

1379821.30 1650900.81 1732955.45 1769736.84 are my choices I cannot figure this out!
*March 2, 2016*

**Math Algebra PLEASE EXPLAIN**

Ferguson Financial Advisers Inc. (FFAI) allocates 76% of its annual budget to employee compensation. FFAI spends $1,345,000 annually on employee compensation. What is the annual budget of FFAI?
*March 2, 2016*

**MATH PLEASE**

19.54 31.29 20.99 44.50
*February 26, 2016*

**MATH PLEASE**

ATCE Learning Center would like a possible net profit of $650,000 on its new resource manual it sells to schools. The fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. If the estimated unit sales are 1,250,000 units, what selling ...
*February 26, 2016*

**MATH PLEASE**

Future Sporting Goods has traditionally had about 25% of the retail business in Martin County. The total estimated sporting goods business in the county for next year is $15,430,000. What sporting goods business can Future project for next year? I CANNOT GET THIS
*February 26, 2016*

**MATH PLEASE**

Top Kitchens handles 17% of all the kitchen production in the area for new construction. It is estimated that the cost of kitchens is 14% of the total cost of constructing a new house. New home construction in the area for the next year is estimated to total $32 million. What ...
*February 26, 2016*

**MATH PLEASE**

Miday Quong is buying bagels for her coworkers. She buys a dozen bagels priced at $5.49 a dozen. The bakery's cost for making the bagels is $2.25 per dozen. What is the markup rate based on selling price on a dozen bagels? 17.3 41.0 24.4 59.0
*February 25, 2016*

**MATH PLEASE**

Lansing Bookery regularly marks up books 40% of the selling price. The bookstore's cost on a new best-selling book is $12.95 per book. What is the selling price of this book? 21.58 33.21 32.38 18.13
*February 25, 2016*

**MATH HELP PLEASE Explain**

Toolbox:$5.16; markup 40% of the selling price. What's the selling price?
*February 24, 2016*

**MATH HELP**

My answer was 220,500 but it keeps saying I am wrong.
*February 23, 2016*

**MATH HELP**

a company carries an $630,000 inventory. The company estimates the annual cost of carrying the inventory at 35% of the ihe inventory value. What is the approximate ANNUAL cost of carring the inventory?
*February 23, 2016*

**Algebra **

The volume of a right circular cylinder (think of a pop can) is jointly proportional to the square of the radius of the circular base and to the height. For example, when the height is 10.62 cm and the radius is 3 cm, then the volume is 300 cm3. Find the formula of the volume ...
*February 20, 2016*

**Math**

If there are 24 books on a shelf and 2/3 are fictional, how do I solve to to find out the number that are fictional
*February 10, 2016*

**physics**

Position vector r⃗ has magnitude of 15.0 m and direction angle 250 ∘. Find its components. Find the components, magnitude, and direction of the vector −2r⃗ . Where do I start?
*January 27, 2016*

**Math CALCULUS HELP PLEASE**

**RESOLVED** For any future calculus students who get stumped with this (relatively simple) problem: You must have 1150 mL of air in your lungs AT MINIMUM. That means at your local minimum in your cos graph the y-value must be 1150, which makes the last part of your equation (...
*January 19, 2016*

**Math CALCULUS HELP PLEASE**

I think it may be: V(t)=1600cos(pi x t)+1150 But a previous tutor said the "+1150" was incorrect on this website so I am not sure.
*January 19, 2016*

**Math CALCULUS HELP PLEASE**

Tidal volume is the volume of air displaced in the lungs between inhalation and exhalation (the amount of air in a breath). The residual volume is given by the amount remaining in the lungs even after the deepest exhalation (i.e. the minimum amount of air remaining in the ...
*January 19, 2016*

**Finite Math**

An urn contains 8 blue marbles and 7 red marbles. A sample of 6 marbles is chosen from the urn without replacement. What is the probability that the sample contains at least one blue marble?
*November 10, 2015*

**Chemistry**

1) A saturated solution of the slightly soluble salt MA3 is 1.4 ×10^–3 M in MA3. What is its Ksp value? 2) A 20.0 mL sample of NaIO3 was treated with an excess of KI and HCl and the iodine produced titrated with 0.05125 M Na2S2O3. 19.35 mL of Na2S2O3 solution were ...
*November 9, 2015*

**Chem**

1) A saturated solution of the slightly soluble salt MA3 is 1.4 ×10^–3 M in MA3. What is its Ksp value? 2) A 20.0 mL sample of NaIO3 was treated with an excess of KI and HCl and the iodine produced titrated with 0.05125 M Na2S2O3. 19.35 mL of Na2S2O3 solution were ...
*November 8, 2015*

**thermo**

an open container with 10L of water at 1 bar and 20 C is used for cooling electronic parts.Each electronic part has a mass of 01.kg and an average specific heat of 0.14 kJ/kg-K. The electronic parts are initially at 300 degrees Celcius and are required to be cooled to 80 ...
*September 29, 2015*

**Math**

If 2/3 pound of candy costs $7 how much does 1 pound of candy cost?
*September 23, 2015*

**Math**

There are three times as many chickens than pigs on a farm. All the chickens and pigs have 2400 feet all together. How many more chickens than pigsare there?
*September 22, 2015*

**Geology**

rate of change
*September 13, 2015*

**Geology**

Look up and review these terms and what a graphical representation or formula would look like fro the relationships to: rate of change
*September 13, 2015*

**Math**

What is the midpoint of the line segment whose endpoints are (-8, 12) and (-13, -2)?
*April 24, 2015*

**physics**

how to determine the net electric force on q3 q3= + 10 uC distance from q3 to q2 =40 cm distance from q1 to q2 =50 cm distance from q1 to q3 = 30 cm q2 =-80 uC q1=+50 uC
*April 19, 2015*

**chemistry**

What is the ph of 0.25 M tartaric acid? Ka=2.5*10^-5M
*March 1, 2015*

**physics**

Two masses of 3.25 kg each, connected by a string, slide down a ramp making an angle of 31° with the horizontal. The coefficient of kinetic friction between m1 and the ramp is 0.31. The coefficient of kinetic friction between m2 and the ramp is 0.17. Find the magnitude of ...
*February 27, 2015*

**Physics**

Two blocks, stacked one on top of the other, slide on a frictionless horizontal surface. The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.50. The top block has a mass of 2.6 kg, and the bottom block's mass is 4.0 kg. If...
*February 27, 2015*

**physics**

A block with a mass of 4.25 kg is placed at rest on a surface inclined at an angle of 44.8° above the horizontal. The coefficient of static friction between the block and the surface is 0.520, and a force of magnitude $F$ pushes upward on the block, parallel to the ...
*February 24, 2015*

**Physics**

Two blocks, stacked one on top of the other, slide on a frictionless horizontal surface. The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.50. The top block has a mass of 2.6 kg, and the bottom block's mass is 4.0 kg. If...
*February 22, 2015*

**physics**

A fire helicopter carries a 664 kg bucket of water at the end of a 24.9 m long cable. Flying back from a fire at a constant speed of 44.2 m/s, the cable makes an angle of 41.6o with respect to the vertical. Determine the force of air resistance on the bucket.
*February 17, 2015*

**physics**

When you lift a bowling ball with a force of 60.7 N, the ball accelerates upward with an acceleration a. If you lift with a force of 69.3 N, the ball's acceleration is 1.99a. Calculate the weight of the bowling ball.
*February 15, 2015*

**art**

3.Is D.
*February 5, 2015*

**physics**

Initially, a particle is moving at 5.45 m/s at an angle of 38.5° above the horizontal. Four seconds later, its velocity is 6.24 m/s at an angle of 54.3° below the horizontal. What was the particle's average acceleration during these 4.00 seconds in the x-direction...
*February 4, 2015*

**Physics**

A charge of 8.0 x 10^(-6) is located inside a sphere. What is the flux through the sphere? Im not sure if this would be just the charge over elipson0. it seems to easy...
*February 3, 2015*

**College Algebra**

A total of $14,000 is invested in 3 accounts earning 3%, 4%, and 5% annual interest. The combined interest for one year is $539. If the amount invested at 5% is three times the amount at 4%, find the amount invested at 3%.
*December 3, 2014*

**algebra**

P = 2L + 2W 34 = 2(W + 7) + 2W
*November 27, 2014*

**Algebra**

x+y = 156 x = y+28
*November 27, 2014*

**Physics**

Thank you Henry! You did a really nice job and it helped me a lot!! (:
*November 26, 2014*

**Physics**

4.82 kJ work is done by a worker pulling a crate across the deck of a ship at a constant speed of 7.82 m/s by a 453 N force. The rope is being pulled at a 37.0 degree angle to the deck. a)How far was it pulled? b)What is the friction force? c)What is the work done against ...
*November 26, 2014*

**science**

all alkalies are bases but all bases are not alkalies
*October 18, 2014*

**Chemisty**

Brad
*September 15, 2014*

**Math, Physics**

A soccer ball is kicked from the ground at an angle of è = 46 degrees with respect to the horizontal. The hang time of the ball is tm = 1.9 s. What is the total horizontal distance traveled by the ball in meters?
*September 11, 2014*

**Physics**

What is the magnitude of the electric force between a proton and an electron when they are at a distance of 2.63 Angstrom from each other?
*August 29, 2014*

**Physics Electricity and Magnetism**

F=Eq q=F/E q=2.34^-4/6620
*August 29, 2014*

**intro to computers**

There is no way to enforce security on a USB
*May 31, 2014*

**math**

what integer represents a 500 dollar deposit
*May 19, 2014*

**Algebra 2**

Yoko threw a stone upward at a speed of 10m/sec while standing on a cliff 40 m above ground. A. What was the height of the stone after 3 seconds? B. Estimate how long it took for the stone to touch the ground
*February 6, 2014*

**Physics**

The speed of light in polythene is 1.99 x 108 m/s What is the index of refraction of polythene
*January 20, 2014*

**physics**

An inductor (L = 405 mH), a capacitor (C = 4.43 µF), and a resistor (R = 400 ) are connected in series. A 50.0 Hz AC generator produces a peak current of 250 mA in the circuit. (a) Calculate the required peak voltage ΔVmax. V (b) Determine the phase angle by which ...
*December 1, 2013*

**Intro to computers**

The USB stick is formatted with a fat 32
*November 14, 2013*

**Math**

Rose has a square garden with an area of 49 square feet. She wants to put a fence around her garden. How much fencing does she need to purchase?
*October 12, 2013*

**CALCULUS**

using d^2(h/dt^2=−g+k(dh/dt^2, find an expression for the terminal velocity in terms of k and g? g is the acceleration due to gravity, k is a constant, h(t) is the height of the falling object, dh/dt is its velocity, and d^2(h)dt^2 is its acceleration. And can you ...
*October 7, 2013*

**Calculus**

Could you explain as to how you got that answer?
*October 7, 2013*

**Calculus**

using d^2(h)/dt^2=−g+k(dh/dt)^2, find an expression for the terminal velocity in terms of k and g? g is the acceleration due to gravity, k is a constant, h(t) is the height of the falling object, dh/dt is its velocity, and d^2(h)/dt^2 is its acceleration.
*October 7, 2013*

**physics**

Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 9.7-kg projectile from rest to a speed of 6.5 × 103 m/s. The net force accelerating the projectile is 8.0 × 105 N. ...
*June 24, 2013*

**math**

You are the accountant for Suite Dreams, a retail furniture store. Recently, an order of sofas and chairs was received from the manufacturer with terms of 3/15, n/45. The order amounted to $230,000, and Suite Dreams can borrow money at 13% ordinary interest. How much can be ...
*June 22, 2013*

**math**

Varsity Press, a publisher of college textbooks, received a $70,000 promissory note at 12% ordinary interest for 60 days from one of its customers, Reader’s Choice Bookstores. After 20 days, Varsity Press discounted the note at the Grove Isle Bank at a discount rate of 14...
*June 22, 2013*

**math**

Euromart Tile Company borrowed $40,000 on April 6 for 66 days. The rate was 14% using the ordinary interest rate method. On day 25 of the loan, Euromart made a partial payment of $15,000, and on day 45 of the loan, Euromart made a second partial payment of $10,000. What was ...
*June 22, 2013*

**Physics**

2760
*June 18, 2013*

**English12**

I have a thesis started, I kind of decided on my topic, how Lewis has influenced such writers like JK Rowling, Tolkien and helped them write the novels they are so famous for here is the thesis statement so far "Modern interpretive Literature has led the way for some of ...
*May 30, 2013*

**English12**

I have read the narnia books, I have another book called "A Life" by Michael White its a biography, the essay is as I said before 1500 word minimum, I am looking at arguing how he was influential and is influential still today in his writings, I am having issues ...
*May 30, 2013*

**English12**

Need help on a Research paper, my author is CS Lewis, I am having a major writers block on what to write about, teacher has left it fairly open, need to have an outline and cited works today but he is pretty slack I could have it in tomorrow and be fine, either way stuck on ...
*May 30, 2013*

**Corporate Finance**

Your firm is looking at 3 projects, each costing $500,000: A is estimated to save $125,000 per year for 5 years; B is estimated to save $75,000 for 6 years plus generate tax savings of $20,000 per year; C is estimated to save $75,000 per year for 10 years but requires ...
*April 28, 2013*

**Chemistry**

3. Using Bohr’s model of the atom, calculate the energy required to move an electron from a ground state of n = 2 to an excited state of n = 3. Express your answer in both J/photon and kJ/mol.
*April 23, 2013*

**science **

if u travel 1.5 and the box way 93 she traveled 62 watts I think
*April 10, 2013*

**Geometry**

When you use the distance formula, you are building a _____ triangle whose hypotenuse goes between two given points. A.right B.equilateral C.acute D.None of these
*March 26, 2013*

**Life orientation**

*Describe ;)
*March 26, 2013*

**Life orientation**

*hazards *crisis *globally ;)
*March 26, 2013*

**Biochemistry**

In plants, it can be assumed that NADPH like NADH is energetically equivalent to 2.5 ATP. Calculate the number of ATP and ATP equivalents that are needed to synthesize one molecule 0f glucose-6-phosphate from CO2 and photosynthetically produced ATP and NADPH.
*March 25, 2013*

**math**

y3K, Inc., has sales of $5,276, total assets of $3,105, and a debt–equity ratio of 1.40. If its return on equity is 15 percent, what is its net income? Can someone help with a formula?
*March 18, 2013*

**Calculus**

a ladder 6m long is leaning against a wall. if the top of th ladder is slipping down at th rate of 13 m/s, how fast is the bottom moving away from the wall when it is 5m from the wall? (answer in m/s) Please Help Before 230 pm central time
*March 8, 2013*

**math**

A planned community has 300 homes, each with an automatic garage door opener. The door opener has eight switches that a homeowner can set to 0 or 1. For example, a door opener code might be 01100101. Assuming all the homes in the community are sold, what is the probability ...
*March 3, 2013*

**math**

A bag contains 44 U.S. quarters and six Canadian quarters. (The coins are identical in size.) If seven quarters are randomly picked from the bag, what is the probability of getting at least one Canadian quarter? (Round your answer to one decimal place.)
*March 3, 2013*

**math**

If a person draws two cards from a standard deck (without replacing them), what is the probability that at least one of the cards is a face card? (Round your answer to one decimal place.)
*March 3, 2013*

**calculus**

Find the value for W when the limit as x approaches 8 of ((2x^2)-7x + W)/(x-8) = 25
*February 26, 2013*

**calculus**

evaluate the following limit... ((1-x)/((1/e)-(e^-x))) as x approaches one
*February 26, 2013*

**calculus**

what is the limit of (9x/(9x+5))^(6x) as x approaches infinity?
*February 26, 2013*

**physics**

the total potential difference from point A to point B in a circuit is +5 V. The total potential difference from point A to point C in a circuit is -16 V. What must be hte potential difference from point B to point C?
*February 20, 2013*

**7th grade math please help Ms. Sue ASAP**

you know Delilah our math teacher looks at this if you are going to connexs
*February 13, 2013*

**chemistry**

Molarity = moles of solute/ Liter. 5g O2 * (1 mol O2/ 32 g O2)= x moles O2 convert 250 mL to Liters X moles O2/ Liters = molarity
*December 12, 2012*

**chemistry**

When using the van't Hoff factor, I multiply the number of moles of CaCl2 by the factor right? So when finding the mole fraction of CaCl2 in the solution, it would be 3(1.22 mol CaCl2)/[3(1.22) + 12.2] which equals about .231. So then it would be dP = .231 * 239 = 55.2 mm ...
*December 12, 2012*

**chemistry**

Okay so I used the equation dP= Xsolute * Psol. I got 32.3 and it was correct. I used the exact same equation for this one, and I got 21.7. For some reason it was incorrect. What am I doing wrong? The vapor pressure of pure water at 70°C is 239 mm Hg. What is the vapor ...
*December 12, 2012*

**chemistry**

What's the difference between Psol and Pvap depression? How would I find the Pvap depression?
*December 12, 2012*

**chemistry**

The vapor pressure of pure water at 70°C is 231 mm Hg. What is the vapor pressure depression of a solution of 115 g of the antifreeze ethylene glycol, C2H6O2, a nonvolatile compound, in 205 g of water? Use molar masses with at least as many significant figures as the data ...
*December 12, 2012*

**English**

i have the words in front of me with the meaning.... so I am lost thats all I can say...
*December 6, 2012*

**English**

1. poignant 2. contend 4. conversely 7. prevalent 8. contemporary 9. charisma
*December 6, 2012*

**English**

those r my answers
*December 6, 2012*

**English**

Many people are surprised to learn how __1__ poverty is __2__ America. Today millions live below the poverty line, and the number seems to escalate daily. Judy and Martin Reed exemplify the old saying, “Opposites attract.” A __3__. Judy chooses work that brings her ...
*December 6, 2012*