Monday

April 27, 2015

April 27, 2015

Total # Posts: 817

**computer science**

Using the Crow’s Foot notation, create an ERD that can be implemented for a medical clinic, using the following business rules: A patient can make many appointments with one or more doctors in the clinic, and a doctor can accept appointments with many patients. ...
*June 27, 2012*

**Pre algebra**

Tasha has a savings account which earn 8% interest. If she has $1400 in her account, how much interest will she earn in one year? I got $112.00 but it doesn't look right.
*June 24, 2012*

**international trade**

2. Consider two countries, Home and Foreign. Assume that Home is labor-abundant while Foreign is land-abundant. Also suppose that there are two industries, wine and cheese, with wine being the more labor-intensive industry. a) Suppose that both wine and cheese industry produce...
*May 24, 2012*

**Math/Prob**

Claire takes a five-question true-false test. She hasn't studied, so she guesses at random. With her ESP she figures she has a 60% probability of getting any one answer wrong. A. What is the probability of getting an answer wrong? (Do you think they want me to ignore the ...
*May 23, 2012*

**physics **

a go cart starts at rest and accelerates to 40 m/s in 200m what is the acceleration of the cyclist?
*May 23, 2012*

**physics**

a go-cart starts and accelerates to 40 m/s in 200m. what is the acceleration of the go-cart?
*May 23, 2012*

**physics **

A cyclist starts at rest and accelerates to a speed of 20 m/s in 5 s. what is the acceleration of the cyclist?
*May 23, 2012*

**physics **

a car travels 50 meters in 1 second. what is the car's velocity?
*May 23, 2012*

**chemistry**

Mass is lost or gains in a.) all chemical reactions b.) all nuclear fission reactions c.) all nuclear fusion reactions d.) all chemical and nuclear reactions my guess is B
*May 20, 2012*

**international trade**

From the economic point of view, India and China are somewhat similar: both are huge, low-wage countries, probably with similar patterns of comparative advantage, which until recently were relatively closed to international trade. China was the first to open up. Now that India...
*May 10, 2012*

**Math**

Thank you!
*May 7, 2012*

**Math**

You run pizza shop and have 8 different toppings that a customer can order. The customer can order any combination of topping including none but they cannot have double of any toppings. How many different pizza combinations can be ordered?
*May 7, 2012*

**Geometry**

A flush tank on a toliet is rectangular with dimensions of 21 in. by 6.5 in. and contains water to a depth of 12 in. How many gallons of water per flush will be saved if the depth of water is reduced by one third? (231 in^3 per gallon.)
*May 4, 2012*

**chemistry**

what concentration of hydroxide ion ust be exceeded in a .01M solution of nickel(II) nitrate in order to precipitate nickel (II) hydroxide?
*May 1, 2012*

**math**

A building has 4 stories that are each 15 feet high. A scale drawing has the height of the building at 5 inches. Which of the following is the correct scale?
*April 16, 2012*

**geometry**

I'm not understanding
*April 13, 2012*

**health**

I got C correct on my test
*April 11, 2012*

**algebra 2**

The formula d=1.35ãh models the distance d in miles from the horizon where h is the distance in feet from a personfs eyes to the water. If you are standing in a boat and the distance from the water to your eyes is 8 ft, what is your distance from the horizon...
*March 29, 2012*

**physics**

The force on a wire is a maximum of 6.00\times 10^{ - 2} {\rm{N}} when placed between the pole faces of a magnet. The current flows horizontally to the right and the magnetic field is vertical. The wire is observed to "jump" toward the observer when the current is ...
*March 25, 2012*

**chemistry**

Did you figure out how to answer this?
*March 23, 2012*

**investment**

A bond currently sells for $1,250, which gives it a yield to maturity of 7%. Suppose that if the yield increases by 22 basis points, the price of the bond falls to $1,228. Required: What is the duration of this bond?
*March 15, 2012*

**Physics**

Pilots can be tested for the stresses of flying high-speed jets in a whirling "human centrifuge," which takes 1.8 min to turn through 21 complete revolutions before reaching its final speed. 1. What is the angular acceleration?(rev/min^2) 2. What is the final angular...
*March 5, 2012*

**14**

I got D
*March 4, 2012*

**12**

I got A
*March 4, 2012*

**Math**

4 loaves of bread cit into 10 slices. 18 people eat 2 slices. What is the fraction that shows how much bread was eaten
*March 1, 2012*

**Trig**

Use a calculator to find θ to the nearest tenth of a degree, if 0° < θ < 360° and csc(θ)=1.4307 with θ in QII θ=?
*February 28, 2012*

**Maths**

y=1/x-3 - 4 state the domain and range, at first I though domain would be R (any real number) and range would be R also? I'm not sure
*February 25, 2012*

**Science**

temperature
*February 21, 2012*

**physics**

A 820-{\rm kg} sports car collides into the rear end of a 2700-{\rm kg} SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 3.0 {\rm m} before stopping. The police officer, estimating the coefficient of kinetic friction between ...
*February 20, 2012*

**physics**

A 820-{\rm kg} sports car collides into the rear end of a 2700-{\rm kg} SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 3.0 {\rm m} before stopping. The police officer, estimating the coefficient of kinetic friction between ...
*February 20, 2012*

**math**

determine the angular velocity if 11.3 revolutions are completed in 3.9 seconds
*February 19, 2012*

**office procedures**

listen to her and go back to work
*February 15, 2012*

**math**

Mr. spoke earns 800 + 7% of his sales. so we can show this by his total pay- P = 800+ 7%x monthly sales P= 800 + 7%x9200 P= 800 + 644 P= 1,444 Therefor last month Mr.Spoke earnt $1444
*February 12, 2012*

**math**

A girl cycles from her house to a friend’s house at 22 km/h and home again at 26 km/h. If the round trip takes 54 min, how far is it to her friend’s house? Round your answer to the nearest 0.1 km. [
*February 12, 2012*

**MATH**

n a right triangle ABC, C = 90°, A = 41° and c = 67 cm. Find b. (Round your answer to the nearest whole number.) b =
*February 10, 2012*

**Investments**

A firm has current assets that could be sold for their book value of $7 million. The book value of its fixed assets is $57 million, but they could be sold for $99 million today. The firm has total debt with a book value of $32 million but interest rate declines have caused the...
*February 4, 2012*

**Investments**

An analyst gathers the following information about Meyer, Inc.: • Meyer has 1,300 shares of 8% cumulative preferred stock outstanding, with a par value of $240, and liquidation value of $250. • Meyer has 22,400 shares of common stock outstanding, with a par value of...
*February 4, 2012*

**Investments**

An analyst gathers the following information about Meyer, Inc.: • Meyer has 1,300 shares of 8% cumulative preferred stock outstanding, with a par value of $240, and liquidation value of $250. • Meyer has 22,400 shares of common stock outstanding, with a par value of...
*February 3, 2012*

**Investments**

A firm has current assets that could be sold for their book value of $7 million. The book value of its fixed assets is $57 million, but they could be sold for $99 million today. The firm has total debt with a book value of $32 million but interest rate declines have caused the...
*February 3, 2012*

**science**

How much total, KE and PE does a roller coaster have when it has a mass of 750 kg, and is 5m above the ground?
*January 30, 2012*

**math**

(x-1, y+3) apply to all 3 points
*January 25, 2012*

**math**

make a proportion and cross multiply to solve for x (yards/chairs)=(yards/chairs) (6yards/3chairs)=(x yards/ 7 chairs) (6yards x 7 chairs)/(3 chairs)= x (42/3)=x 14=x so 14 yards
*January 25, 2012*

**math**

a=p(1+r)^t a=2,000(1+(1.75/100))^8 don't have a calculator on me
*January 25, 2012*

**Chemisty**

The compound potassium carbonate is a strong electrolyte. Write the reaction when potassium carbonate is put into water
*January 22, 2012*

**Physics **

Under the spreading chestnut tree the village blacksmith dunks a red-hot horseshoe into a large bucket of 22*C water. How much heat was lost by the horseshoe in vaporizing .00100 kg. of water?
*January 22, 2012*

**Physics**

A mouse travels along a straight line; its distance from the origin at any time is given by the equation. x= (8.1 cm * s^-1)t-(2.7cm * s^-2)t^2 A) Find the average velocity of the mouse in the interval from t= 0 to t= 1.0 . value=?; unit= ? B)Find the average velocity of the ...
*January 14, 2012*

**Physics**

i for got to add the "t" A)t=0 to t=10 B)t= 0 to t= 4.0
*January 14, 2012*

**Physics**

A mouse travels along a straight line; its distance from the origin at any time is given by the equation. x= (8.1 cm * s^-1)t-(2.7cm * s^-2)t^2 A) Find the average velocity of the mouse in the interval from = 0 to = 1.0 . value=?; unit= ? B)Find the average velocity of the ...
*January 14, 2012*

**physics**

How does the water pressure .5m below the surface of a small pond compare to the pressure .5m below the surface of a large lake?
*January 10, 2012*

**math**

mode is a number that appears the most... if two numbers repeat the same number of time you write both
*January 10, 2012*

**math**

you made the mistake 2b=h/A
*January 10, 2012*

**Physics**

Problems 7–9 are related to the following scenario: We have a collection of 5 different mass/spring combinations that all have different properties. All of them have some damping and all have the same mass. The properties are summarized in the table below: Name Natural ...
*January 10, 2012*

**math**

27x3=71 each triangle is an equillateral, all sides equal 71/3=27 would be each side length
*January 9, 2012*

**math**

A=P(1+r)^t, A=1200 P=5300 R=7.2/100, now solve for t
*January 9, 2012*

**Pre-Calc-Please check**

1. is correct 2. is correct
*January 9, 2012*

**Physics**

1. If a mass on a spring and a pendulum have the same period on the moon where the gravity is about 1/6 of its value on the Earth, which one will run faster on the Earth? a. The mass on the spring. b. The pendulum. c. They will both run the same. d. It depends on which one has...
*January 9, 2012*

**Chemistry**

If the density of a substance is 15.2 g/mL, what is the density in cg/kl?
*December 31, 2011*

**Math**

convert feet to inches: 10 feet = 120 inches 15 feet = 180 inches get the area of the floor: 120in x 180in= 21,600in^2 divide the area of the floor to the area of the tile: area of the tile is "9in^2" 21600in^2 divided by 9in^2 is 2,400 tiles.
*December 30, 2011*

**Physics**

Water flows at a speed of 15 m/s through a pipe that has a radius of 0.40 m. The water then flows through a smaller pipe at a speed of 45 m/s. What is the radius of the smaller pipe?
*December 19, 2011*

**physics**

A light spring of constant k = 156 N/m rests vertically on the bottom of a large beaker of water (Fig. P9.34a). A 4.10 kg block of wood (density = 650 kg/m3) is connected to the spring and the block-spring system is allowed to come to static equilibrium (Fig. P9.34b). What is...
*December 15, 2011*

**chemistry**

A 15.0 ml sample of an unknown HClO4 solution requires 50.3 ml if 0.101 M NaOH for complete neutralization. What was the concentration of the unknown HClO4 solution? The neutralization reaction is: HClO4(aq)+ NaOh(aq)yields H2O(l)+ NaClO4 (aq) If anyone can help me to set this...
*December 3, 2011*

**Chem**

A gas generator is constructed to collect the CO2(g) evolved from a reaction. during lab we set up the CO2 generator by placing 10ml of 3 M HCL in a 200mm test tube. then slide the 75mm test tube into the 200mm test tube without splashing any of the acid into the sample. The ...
*November 16, 2011*

**calculus**

ahh thank you so much
*November 8, 2011*

**calculus**

So from a previous post I asked, "f(x)=(1+x) what is f'(x) when x=0?" and someone replied, "the derivative of f(x)=x+1 is f'(x)=1 so your answer would just be 1" Now my question is why!? it doesn't matter what x is? f'x when x=238423904 will...
*November 8, 2011*

**Math Garde 3**

2x9 and 5x9 will always be even numbers? I think that's what they're after.
*November 8, 2011*

**Spanish**

Correction 1.A nosotros les duele la cabeza.
*November 7, 2011*

**Spanish**

I had to write sentencesabout an ache in a certain body part with indirect pronoun . There were pictures provided and the first part of the sentence like "A mi amigo" and we had to fill in the restCould you check, please 1. pain in head A nosotros nos duele la cabeza...
*November 7, 2011*

**Spanish**

Please check-I have to rewrite with an indirect object pronoun 1. Escribo una carta a mi abuela. Le escribo una carta a mi abuela. 2.Mando una tarjeta postal a mis amigos. Les mando una tarjeta postal a mi amigos.
*November 7, 2011*

**calculus**

so it doesn't matter what x is? f'x when x=238423904 will also be 1? For some reason I thought that you would have to plug in 0 for x.. like f(x) = (1+x) and when x = 0, f(0) = (1+0) = 1. So f'(0) would = 0. Can anybody help me rationalize why this is wrong? thanks...
*November 3, 2011*

**calculus**

f(x)=(1+x) what is f'(x) when x=0
*November 3, 2011*

**physics**

A 42-kg pole vaulter running at 14 m/s vaults over the bar. Her speed when she is above the bar is 1.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
*October 12, 2011*

**physics**

A model rocket is launched straight upward with an initial speed of 45.4 m/s. It accelerates with a constant upward acceleration of 2.98 m/s 2 until its engines stop at an altitude of 150 m. What is the maximum height reached by the rocket? The acceleration of gravity is 9.81 ...
*October 3, 2011*

**calculus**

lim as approaches infinity of sin(pie.x/2-3x) i need the work and answer find the limit
*October 2, 2011*

**physics**

How long is the rocket in the air? Answer in units of s
*October 2, 2011*

**physics**

When does the rocket reach maximum height? Answer in units of s
*October 2, 2011*

**physics**

How long is the rocket in the air? Answer in units of s
*October 2, 2011*

**physics**

When does the rocket reach maximum height? Answer in units of s
*October 2, 2011*

**physics**

A model rocket is launched straight upward with an initial speed of 45.4 m/s. It accelerates with a constant upward acceleration of 2.98 m/s 2 until its engines stop at an altitude of 150 m. What is the maximum height reached by the rocket? The acceleration of gravity is 9.81 ...
*October 2, 2011*

**physics**

A helicopter is rising at 5.2 m/s when a bag of its cargo is dropped. The bag falls for 2.5 s. what is the bags velocity
*September 19, 2011*

**Math**

how do i approach this problem though so i can get the right answer
*September 15, 2011*

**Math**

If C represents a variable, then which of these expressions has a coefficient of 3 ? a) C + 3 (b) 3 C + 1 (c) 2 C − 3 (d) 5 − 2 C (e) 3 − 2 C
*September 15, 2011*

**Math**

Its decimal i believe cause fractional notations are converted into decimal notations
*September 15, 2011*

**Chemistry**

Ejected neutrons sustain the fission reaction by serving as reactants to split additional fissionable nuclei, which roduce additional neutrons, which can slit additional dissionable nuclei, and so on. The result is a what???
*September 13, 2011*

**Mr. bobpursley**

Thank you for your time and frankness. I agree with you.
*September 4, 2011*

**chemistry f/u**

Thank you Mr. bobpursley. I am still unclear on a few things. massethanol*Ceth(Tf-7.7)+masswater*Cwater*(Tf-27.1)=0 solve for Tf 17.75g ethanol x(Tf-7.7)+31.6g water x (Tf-27.1)=0 This is the algebra that I do not know how to derive to move to the next step. Do I add it all to...
*September 4, 2011*

**Chemistry**

New problem. Any assistance is greatly appreciated. 22.5 ml of ethanol (density=0.789 g/ml) initially at 7.7 deg. C is mixed with 31.6 ml of water (density=1.0 g/ml) initially at 27.1 deg. C in an insulated beaker. Assuming that no heat is lost, what is the final temperature ...
*September 4, 2011*

**Chemistry**

New problem. Any assistance is greatly appreciated. 22.5 ml of ethanol (density=0.789 g/ml) initially at 7.7 deg. C is mixed with 31.6 ml of water (density=1.0 g/ml) initially at 27.1 deg. C in an insulated beaker. Assuming that no heat is lost, what is the final temperature ...
*September 4, 2011*

**Dr. Bob**

Thank you kind sir for guiding my work on the last question. You gave me the means to answer the question correctly without giving me the answer. Your expertise is greatly appreciated. If you tutor online, I would gladly pay for your guidance if you are interested
*September 4, 2011*

**Chemistry**

Thank you very much for your assistance preemptively. My question has to do with law of conservation of mass. A 50g sample of iron reacts with 21g of oxygen to from how many grams of iron oxide? Is the answer maybe 71g or 29g. This is stumping me.
*September 3, 2011*

**chemistry**

This has to do with law of conservation of mass I believe but it stumps me. 50g or iron reacts with 21g of oxygen to form how many gram of iron oxide? Is the answer 71g or 29g
*September 3, 2011*

**Pre-Calc**

Find [4(cos115+isin115)]^6
*July 25, 2011*

**calculus**

Why did the 2ðx^2+108/x^2 become 2ðx-108/x^2
*July 18, 2011*

**calculus**

A large soup can is to be designed so that the can will hold 54pi cubic inches of soup. The radius of the can is "x" inches and the height of the can is "h" inches. Find the values for the radius and the height such that the amount of metal needed is as ...
*July 18, 2011*

**MATH**

1) During the two months of the summer holiday, you find a summer job that pays $160 per week with a $10 a week raise. How much money will be made by the end of the summer? 2 Your grandmother offers you $1 on the first day of March break and offers to double it each day of the...
*July 8, 2011*

**derivative **

Find the derivative. 11) f(t)=(1)/(sqrt(8t-3)) 12) g(t)= ((4t-3)^2)/ ((5t+1)^4) Thanks.
*June 15, 2011*

**calculus**

18) The demand equation is x + 1/6p - 10+0. Compute the elasticity of demand and determine whether the demand is elastic, unitary, or inelastic at p=50. a) 5; elastic b) 1/9; inelastic c) 7/6; elastic d) 6; elastic I choose answer A. Is that correct?
*June 15, 2011*

**maths**

The mean weight (1.0042kg) of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or more. Options...
*June 13, 2011*

**maths**

The mean weight (1.0042kg) of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or more. Options...
*June 12, 2011*

**maths**

The mean weight (1.0042kg) of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or more. Options...
*June 11, 2011*