Monday
April 21, 2014

Posts by bill


Total # Posts: 672

Math
Write an algebraic expression for "15 less than the product of the square of x and 5."

CHEMISTRY
WHAT IS THE EMPIRICAL FORMULA FOR A COMPOUND THAT HAS 200GRAMS. 97.30 GRAMS OF CARBON, 16.22 GRAMS OF HYDROGEN, AND THE REST IS OXYGEN?

Math
Jim paid $ 5.55 for 1 notepad and 7 pencils. Anne paid $ 12.28 for 3 notepads and 2 pencils. How much does each notepad cost? Show all work

statistic
Roll two 6-sided dice and examine their sum. a) How long will it take to roll "snake-eyes" (a pair of ones)? b) What is the probability of rolling a sum of 7 on the first roll? c) What is the probability of rolling a sum of 7 on the fourth roll? d) What is the probab...

College Physics
A doubly charged ion is accelerated to an energy of 33.0 keV by the electric field between two parallel conducting plates separated by 1.70 cm. What is the electric field strength between the plates?

math
If a took a loan of $12000 for one year at 9.5% simple interest what would be my interest

math
if a took a loan out for $12000 for one year at 10% simple discount what would be my interest

Chem
When 100mL of 0.60mol per liter K3BO3 is added to 200 mL of 0.40 mol per liter Ca3(BO3)2 Find a)moles of K3BO b) moles of Ca(BO3)2 c)final concentration of K+ d)final concentration of Ca+2 e) final concentration of BO3 negative 3

Chem
In the lab a 3.3mol per liter solution was prepared by adding H2O to 140mL of a 4.3mol Per Liter solution of HCL. How much water was added?

math
factor 2x^2+7x+6=0

transportation economic
In your own words, describe the meaning of marginal cost. You normally buy a crate of wine for $75. One crate has 6 bottles of wine. After a month, the store clerk informs you that the same crate of wine now costs $82. However, there are 7 bottles in a crate. To the nearest ce...

biology
if there is no oxygen for the glycolysis what process would that be called?

physics
a space probe launched from earth and orbits at a distance of 15,000 m from earth's center, the gravitational force is 500 N. What is the size of force when it is 25,000 m from earth.

Physics
A hang glider and its pilot have a total mass equal to 120 kg. While executing a 360 degree turn, the glider moves in a circle with an 8-m radius. The gliders mass is 10 m/s. a) what is the net force on the hang glider? b) What is the acceleration?

Econ
When the law of diminishing returns applies, which of the following would rise with increased employment of labor, ceteris paribus? A. Fixed costs B. Marginal cost C. Marginal revenue D. The wage rate

Algebra
1800 (x+20) 1800x + 20(1800) or 1800x + 36,000 are the expressions all equivalent? How can you determine if they are equivalent?

Math
The manager of Pine Town Furniture purchased a new copier for $28,000. She plans to keep it for four years, at which point she expects to trade the copier in and receive $6000 credit toward the purchase of a new machine. She is going to use straight-line depreciation on the co...

Math
The total cost of renting a car is a function of the basic charge, insurance, and the number of miles driven. Suppose a compact car costs $0.10 per mile plus $30 in basic charges and insurance. A mid-size car costs $50 in basic charges and insurance plus $0.10 per mile.

organic chemistry
I need help understanding how to differentiate between isomers and resonance structures in skeletal structures. Specifically, here is an image to a problem with the answers: i.imgur. com /mz3URSa.jpg (remove spaces) The left most structure is the reference structure and the ot...

science
If you have 10 lbs shrimp at 80 deg F how much ice would it take to reach 50 deg F in 10 minutes?

alg
5x-10/5 ?

alg
−(6p + 12

physics
A block is pressed against a vertical wall by a force , as the drawing shows. This force can either push the block upward at a constant velocity or allow it to slide downward at a constant velocity. The magnitude of the force is different in the two cases, while the directiona...

physics
Geosynchronous communications satellites are placed in a circular orbit that is 3.59 107 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?

microeconomics
The cost of producing flat-screen TVs has fallen over the past decade. Let’s consider some implications of this fact. A.) Draw a supply-and-demand diagram to show the effect of fallen production costs on the price and quantity of flat-screen TVs sold. B.) In your diagram,...

Pseudocode Format
Need help writing this using pseudocode format: Carly gets paid annually, and she would like a program that will figure out the amount of money she will be receiving each pay period. To make this simpler, we are not worried about any deductions.

Pseudocode Format
Need help writing this into Pseudocode Format: Robert has a van rental company, and he wants a program that determines the total cost of renting a van from him. His customers will pay a base fee (currently set at $50), plus a charge per mile (currently $.25 a mile).

Chemistry
A certain gas has a solubility of .50 g/L under a pressure of 1500 torr. What would its solubility be a 2250 torr?

Physics
In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.

Physics
In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.

Physics
In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.

Physics
In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.

Science
Person weighing 650N lies on a bed of nails,each nail has area of 1m2 Assume 4Nm^-2 pressure is painful what is the smallest number of nails they could lay on and not be hurt

Chemistry
How many milliliters of 1.0 M NaOH must be added to 200. mL of 0.10 M NaH2PO4 to make a buffer solution with a pH of 7.50? (5 points)

Math
What is the perimeter of a trapeziod with an area of 96

physics
A boy is pushing his sled up a snowy slope. The sled has a mass of 20.4 kg and weighs 200 N. The boy pushes with a constant force of 75 N. The sled travels a distance of 10 m and gains 3 m in height. When the sled reaches the top, it is traveling 2 m/s. What is the efficiency ...

Statistics
A pharmaceutical company claims its new medication relieves painful symptoms caused by tension headaches within 15 minutes. To investigate this claim, a local health clinic conducts a study of 45 patients who suffer from chronic tension headaches. Each patient is given medicin...

Statistics
According to a recent pole only 21% of Americans were satisfied with the direction the U.S. is heading. To investigate the reliability of the report an independent polling organization surveyed 500 Americans and inquired as to whether or not they were satisfied with the way th...

Statistics
Assume the weights of men are normally distributed having a mean of 185 lbs and a standard deviation of 17 pounds. A. Calculate the probability a randomly selected man weights less than 225 lbs B. Approximately 72% of men’s weights exceed how many pounds. C. In a random e...

Statistics
Assume the wait time to see a cardiologist at a certain clinic are uniformly distributed between 7 minutes and 23 minutes. Calculate the probability a randomly selected patient waits at least 18 minutes to see the cardiologist. The random variable, Z, is associated with a norm...

Statistics
A Manufacturer of torque converters claim only 1% of them are defective. A. Calculate the Mean number of defective converters in a shipment of 500 converters. B. Calculate the standard deviation in the defective torque converters in a shipment of 500 converters. C. Would it be...

Statistics
A Manufacturer of torque converters claim only 1% of them are defective. A. In a shipment of 12 torque converters calculate the probability exactly 2 converters are defective. B. In a shipment of 35 converters, calculate the probability at least 1 converter is defective.

Statistics
In a certain game of chance a person pays $5 to play a game. A person randomly selects 2 integers ranging from 0-99. The host of the game then uses a random number generator to select 2 integers ranging from 0-99. If the players values and hosts values agree (in any order), th...

Statistics
Use this information to calculate the mean and standard deviation of this random variable. P(x)- .25, .05, .55, .15

Statistics
A standard deck of 52 playing cards is composed of 4 suits. Each mix contains 13 cards. Jacks, Queens, and Kings are considered face cards. Assume three cards are selected without replacement. Calculate the probability of drawing two hearts, followed by a spade.

Chemistry
A solution is prepared by dissolving 571.6 g of H 2SO4 in enough water to make 1000.0 mL of solution. The solution has a density of 1.3294 g/mL. (molar mass of H2SO4 = 98.08). What is the molar concentration of the solution?

MATH
2

chemistry
What mass of F2 is needed to produce 116 g of PF3 if the reaction has a 77.4% yield?

Pre-calculus
Use this equation. X=t*v*cos(theta) So 2*102*cos67=79.70915021

Pre-calculus
79.70915021

Statistics
In order to compare two kinds of feed, thirteen pigs are split into two groups, and each group received one feed. The following are the gains in weight (kilograms) after a fixed period of time: Feed A: 8.0 7.4 5.8 6.2 8.8 9.5 Feed B: 12.0 18.2 8.0 9.6 8.2 9.9 10.3 We wish to ...

World history
Confucius believed that human beings are essentially A. gods. B. evil. C. good. D. sinful.

chemistry
What has the higher normal melting point: CHI3 or CHF3? The answer in the book is CHI3. So I'm assuming the answer is CHI3 because Iodine is the bigger and will form larger london dispersion forces, but isn't a stronger dipole moment formed in CHF3 because fluorine is ...

Cosmology
UV

Physics conceptual questions
You have a drink that you want to cool off? You could put in 100 g of ice or 100 g of water, both at 0 degree C. Which one would be more effective in cooling your drink? Why?

Math
Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2

Math
Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2

Math
Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2

Math
9/10?

SCIENCE -HELP!!
How does the discovery of seafloor spreading help to explain the mechanism behind why plates move??

Math
If 1 and –6 are two of the roots of 6x^4 + 31 x^3 − 33x^2 − 16x + 12, then what are the other two? A. 2 and 3/2 B. -1 and 6 C. 1/2 and -2/3 D. -2 and 2/3

algerbra
If 1 and –6 are two of the roots of 6x^4 + 31 x^3 − 33x^2 − 16x + 12, then what are the other two? A. 2 and 3/2 B. -1 and 6 C. 1/2 and -2/3 D. -2 and 2/3

Physics
21) A 46 kg skater is standing still in front of a wall. By pushing against the wall she propels herself backward with a velocity of – 1.2 m /s. Her hands are in contact with the wall for 0.8 s. Ignore friction and wind resistance • Find the magnitude and direction o...

Physics
A 4 ohm resistor and 10 ohm resistor are connected in series. If this circuit is connected to a 12 V battery, how much current will flow through the circuit?

college algebra--please help
What percent of the total population is found between the mean and a z-score of -0.50?

Science
Intensity of the HeNe laser (lambda = 632nm) was measured at 2 distances: 1m and 200m from the laser. The meter reading was 10W and 1W correspondingly. How many photons/sec will enter your eye if you look into the laser from 1m? From 2m? Assume that radius of the pupil was 2.4...

Algebra 2
Plan A charges $5 per minute plus a one time monthly fee of $75 and plan B charges $7 per minute, plus a one time monthly fee of $25. After how many minutes will the total cost of the two equations be the same?

Binomial Probability
Before 1918, wolves were shown as 55% male, 45% female. From 1918 to present they were shown as 70% male and 30% female. In a random sample of 12 wolves, what was the probability that 6 were male? What was the probibility that 6 or more were female? What was the probability fe...

Sociology
In the twentieth centruy, which country had a caste system based on race? a. India b. the USA c. South Africa d. a and b only e. b and c only

Chemistry
What does 3p have?

HELP ASAP
I need help asap!

Chemistry
What quantum numbers specify these subshells? 2s n= l= 3p n= t= 6d n= l=

Chemistry
Thanks it was correct!

HELP ASAP
I need help asap!

Chemistry
What element forms an ion with an electronic configuration of [Xe] and a –2 charge?

NEED HELP
Is it Argon?

Chemistry
Metals lose electrons under certain conditions to attain a noble-gas electron configuration. How many electrons must be lost by the element Ca? Is it 2 e^-? Which noble-gas electron configuration is attained in this process? argon radon krypton xenon helium neon

Chemistry
Assuming that the smallest measurable wavelength in an experiment is 0.330 fm (femtometers), what is the maximum mass of an object traveling at 157 m·s^–1 for which the de Broglie wavelength is observable? mass = ? kg

College Chemistry
What volume of the solution in 5a would be necessary to react completely with 23.00mL of 0.549M NH3 according to the equation: NiSO4+6NH3 -> [Ni(NH3)6]SO4 The molarity of ta is 1.667 x 10^-4M

Calculus
What is the point of inflection of the function f(x)=x^3-8x^2+5x+50? Is the local extrema at f(1/3)=50.8 max and f(5)=0 min? For the second derivative I got f(x)=6x-16 and then got x=16/6 when set to zero.

Chemisty HELP ASAP
In this problem, your answers should be mathematical expressions involving a variable. Consider an ideal gas with an absolute temperature of T1 To what temperature would you need to heat the gas to double its pressure? T2=? I got T2=2P but it is wrong

Chemistry
It is 65.4g/mol

Chemistry
P=.995atm V=.205L n=? R=.0821 Lxatm/molxk) T=298K

Chemistry
n=.0833 mols molar mass=(.0833mols/.528g)=.158g/mol

Chemistry
A 0.528 gram sample of a metal, M, reacts completely with sulfuric acid according to: M+H2SO4 -> MSO4+H2 A volume of 205 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr and...

Chemistry
T2=?

Chemistry
In this problem, your answers should be mathematical expressions involving a variable. Consider an ideal gas with an absolute temperature of T1 To what temperature would you need to heat the gas to double its pressure? T2=? I got T2=T1P times 2 but it is wrong

Chemistry Answer?
Is the answer 3.24x10^-3 g/mol?

Chemistry
A 0.528 gram sample of a metal, M, reacts completely with sulfuric acid according to: M+H2SO4 -> MSO4+H2 A volume of 205 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr and...

Chemistry
T1 is 288K but what is T2?

Chemistry
2.05 g of an unknown gas at 45 °C and 1.00 atm is stored in a 1.15-L flask. What is the density of the gas?

Chemistry
At a certain temperature and pressure, one liter of CO2 gas weighs 1.45 g. What is the mass of one liter of C4H10 gas at the same temperature and pressure?

Chemistry
Is the answer 1.85x10^6 L?

Chemistry
A hot air balloon is filled with 1.39 × 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 105 °C. What is the volume of the air in the balloon after it is heated? Assume that none of the gas escapes from the balloon.

Chemistry
An ideal gas is allowed to expand from 6.00 L to 45.0 L at constant temperature. By what factor does the volume increase? ? Number The pressure will Increase by that factor or decrease by that factor? If the initial pressure was 105 atm, what is the final pressure?

Math HELPPP
In a survey of 2000 adults 50 years and older of whom 40% were retired and 60% were pre-retired, the following question was asked: Do you expect your income needs to vary from year to year in retirement? Of those who were retired, 33% answered no, and 67% answered yes. Of thos...

Calculus
What is the derivative of 7e^(3sin^(4x+5))?

Calculus
What is the derivative of 2^(5x)tan(x^2)

Calculus
What is the derivative of sin(3x+1)^4?

Calculus
Find dy/dx using implicit differentiation of xy + sin^2y=10350. Is it -y/(x+2siny)

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