Monday

August 3, 2015

August 3, 2015

Total # Posts: 897

**Science**

Which of the following is a mechanism used by humans to defend against any disease-causing organism 1)the creation of antibodies 2)the injection of vaccines 3)the production of mucus membranes 4)the use of antibiotics
*March 18, 2014*

**American History **

Which organization specifically promoted support for the war among the American people? A. the Committee on Public Information B. the Red Cross C. the Council of National Defense D. the War Industries Board
*March 17, 2014*

**Math**

Mrs. Marcincavage allowed each student in her math class to drop the lowest of their five test scores. When Matthew dropped the lowest of his test scores, a 60, his test average increased by 5 points. What is Matthew’s new test average?
*March 3, 2014*

**Chemistry**

One day at the fertilizer factory, your boss Mr. Haber comes to you with a problem. The process used by the factory to produce ammonia,the raw material for your fertilizer, is just not optimized. He would like to modify the conditions to achieve a better yield of ammonia in ...
*February 25, 2014*

**Chem- Bronsted bases**

Which of the following substances can act as a Bronsted base in aqueous solution? (Select all that apply.) H2O NH3 H2 CH3NH2 O2 PH41+ CO32-
*February 23, 2014*

**chemistry**

If 16.0 mL of 8.5 ✕ 10-2 M HClO4 is added to 22.0 mL of 7.6 ✕ 10-4 M KOH, what is the pH of the solution?
*February 23, 2014*

**AP Chem**

How would you find a formula for a salt that contains NH4+ and is basic? I understand how to determine if a salt is acidic or basic but i don't know how you would go in reverse.
*February 18, 2014*

**chemistry **

What is the molarity of a solution with a volume of 974 mL containing 17 g of CuSO4?
*February 18, 2014*

**Chemisty**

A 25-mL sample of 0.160M solution of NaOH is titrated with 17 mL of an unknown solution of H2SO4. What is the molarity of the sulfuric acid solution? A. 0.004M H2SO4 B. 0.235M H2SO4 C. 0.117M H2SO4 D. 0.002M H2SO4
*February 18, 2014*

**Chemistry**

I need to make a calorimeter for my high school chemistry class. Any suggestions? I have a few ideas but I can't figure out how I would light the food on fire from inside the container. I have to burn the food and measure the heat through water. thank you!!!!!
*February 11, 2014*

**keiser university**

Healthcare Finance Questions 1. Community Hospital has annual net patient revenues of $150 million. At the present time, payments received by the hospital are not deposited for six days on average. The hospital is exploring a lockbox arrangement that promises to cut the six ...
*February 2, 2014*

**Physics**

How do I put pictures
*January 28, 2014*

**Physics**

Spring on Incline The block in the figure is initially at rest on an inclined plane at the equilibrium position that it would have if there were no friction between the block and the plane. How much work is required to move the block 25 cm down the plane if the frictional ...
*January 28, 2014*

**Math**

Department store A charges 9.75% tax; department store B charges 7.25% tax. if a shopper's pre-tax receipt is between $11.57 and $81.43, write and graph a compound inequality that describes the difference in taxes paid for the two locations (to the nearest cent.) I wrote: ...
*January 23, 2014*

**Math**

Cody wants to go on his senior class trip. He finds a job that pays $7 per hour and he also mows lawns for $9 an hour. He needs to earn $693 to pay for the trip, excluding spending money. 1. Write an inequality describing Cody's goal in terms of hours at his job, x, and ...
*January 23, 2014*

**Math**

True or False: 1. if [w-7]<-3, then w-7>3 (NOTE: In this case "[ ]" indicate absolute value.) I did: 3+7<w-7<-3+7 10<w<4 So, I think it's False 2. If -4 < -2t + 6 < 10, then 2>t+6>-5 I worked the equation and got: 5>t>-2 So, I ...
*January 23, 2014*

**Math**

How would you graph an equation like x+y=4 or y-1=-1x-2? I know you have to change the form, i just don't remember how to do it.
*January 23, 2014*

**Math**

They may mean perpendicular to the previous question: y=3x+6
*January 23, 2014*

**Math**

1. What is the equation in standard form of a perpendicular line that passes through (5,1)? 2. What is the x-intercept of the perpendicular line? 3. What is the equation in standard form of a parallel line that passes through (0,-2)? 4. On the parallel line, find the ordered ...
*January 23, 2014*

**Math**

Use the point-slope form linear equation given to complete the following problems. y-3=3(x+1) 1. What is the slope of the given line? Here's what I did: y-3=3(x+1) y-3+3=3x+3 y=3x+6 m=3 Correct so far? 2. What point does this line pass through, which is the basis of this ...
*January 23, 2014*

**please help me!! with this science!!!!!**

Also this is from my quiz so i know all of these are right because it says whether or not i got the question right and what the correct answer is.
*December 11, 2013*

**please help me!! with this science!!!!!**

Question 1: Second-level consumer Question 2: High average air temperatures are critical to the lizard's survival. Question 3: Deciduous forest- moderate temperatures and rainfall. Question 4: Salt level Question 5: Increased drought cutting off water flow in streams ...
*December 11, 2013*

**earth**

3. What can scientists learn from the rate at which radioactive elements decay?
*December 10, 2013*

**IPC**

the highest pressure ever produced in a laboratory setting was about 2000000 atm. if we have a .000010 liter sample of a gas at that pressure until it is equal to 0.275 atm, what would the new volume of that gas be?
*December 3, 2013*

**IPC**

synthetic diamonds can be manufactured at pressures of 60000 atm. if we took 2.00 liters of gas at 1.00 atm and compressed it to a pressure of 60000 atm, what would the volume of that gas be?
*December 3, 2013*

**IPC**

in a thermonuclear device, the pressure of 0.050 liters of gas within the bomb casing reaches 4000000 atm. when the bomb casing is destroyed by the explosion, the gas is released into the atmosphere where it reaches a pressure of 1.00 atm. what is the volume of the gas after ...
*December 3, 2013*

**Science(IPC)**

1.00 L of a gas at standard temperature and pressure is compressed to 473 ML. what is the new pressure of the gas?
*December 3, 2013*

**geometry**

Deshawn built a model train car. The length of the model train car is 6 in. The scale Deshawn used to build the model train car is 1:36. What is the actual length of the train car in FEET?
*December 2, 2013*

**science**

Does Anyone know the answer?? 1 either B or C
*November 24, 2013*

**Chemistry**

Ca+Cl2->CaCl2
*November 19, 2013*

**Chemistry**

How many moles of CaCl2 are produced when this reaction is started with 4.70 grams of chlorine gas?
*November 19, 2013*

**Chemistry**

Thank you so much!
*November 19, 2013*

**Chemistry**

If 5.0 grams of Zinc were added to 35.0 grams of H2SO4, how many grams of hydrogen gas would be evolved?
*November 19, 2013*

**grammar**

What parts of speech are the words "take possession" is this a verb phrase? Is take a "helping verb" here?
*November 7, 2013*

**AP Chemistry**

At 298K and 1 atm, a 0.5 mol sample of O2 and a seperate 0.75 mol sample of CO2 gas have the same: A. mass B. density C. average molecular speed D. average molecular kinetic energy E. number of atoms Please explain, and thanks for helping!
*November 6, 2013*

**AP Chemistry**

Equal masses of Ne and Ar are placed in a rigid, sealed container. If the total pressure in the container is 1.2 atm, what is the partial pressure of Ar?
*November 6, 2013*

**walden University**

how that would change if the dependent variable was yes/no obesity instead of BMI. What cofounders should be included in this analysis?
*November 5, 2013*

**tsu**

Mortgage lenders base the mortgage interest rate they offer you on your credit rating. This makes it financially critical to maintain a credit score of 700 or higher. How much more interest would you pay on a $195,000 home if you put 20% down and financed the remaining with a ...
*November 5, 2013*

**Finance**

P5. A thirty U.S. Treasury bond has a 4.0 percent interest rate. In contrast, a ten-year Treasury bond has an interest rate of 2.5 percent. A maturity risk premium is estimated to be .2 percentage points for the longer maturity bond. Investors expect inflation to average 1.5 ...
*November 2, 2013*

**Math. Please help**

Emory tosses a nickle four times. The probability that he gets at least as many heads as tails is? Explain
*November 2, 2013*

**Math**

A coin is loaded in such way that a tail is three times as likely to occur as a head. If the coin is flipped twice. Find the probability that two heads occur
*November 2, 2013*

**Math**

Twenty marbles are in a bag. There are 5 green marbles, 9 blue marbles, and the rest are red. Two marbles are drawn at random without placement. Find the probability that neither is blue
*November 2, 2013*

**Math**

A coin is loaded in such way that a tail is three times as likely to occur as a head. If the coin is flipped twice. Find the probability that two heads occur
*November 1, 2013*

**Math**

Twenty marbles are in a bag. There are 5 green marbles, 9 blue marbles, and the rest are red. Two marbles are drawn at random without placement. Find the probability that neither is blue
*November 1, 2013*

**Math**

Assume that 3 dice are thrown simultaneously. What is the probability that exactly one 4 will come up?
*November 1, 2013*

**Math**

" kelly has twelve cards numbered 1 to 12. what is the probability of picking three even-numbered cards consecutively, if the first two cards are not replaced?
*November 1, 2013*

**Math. **

You repeatedly toss a fair coin for 5 times. What is the probability that heads comes up at least 3 times before tails comes up twice?
*November 1, 2013*

**Math**

Emory tosses a nickle four times. The probability that he gets at least as many heads as tails is? Explain
*November 1, 2013*

**Math**

Assume that 3 dice are thrown simultaneously. What is the probability that exactly one 4 will come up?
*November 1, 2013*

**Math**

Twenty marbles are in a bag. There are 5 green marbles, 9 blue marbles, and the rest are red. Two marbles are drawn at random without placement. Find the probability that neither is blue
*November 1, 2013*

** Math**

A coin is loaded in such way that a tail is three times as likely to occur as a head. If the coin is flipped twice. Find the probability that two heads occur
*November 1, 2013*

**grammar / english (10th grade)**

Two sentences: 1) The race among the three relay teams was close; none of the three; however, is giving up hope of winning. 2) The race among the three relay teams was close; however, none of the three is giving up hope of winning. Which is the correct one grammatically? ...
*October 22, 2013*

**physics**

I don't know.
*October 17, 2013*

**Math**

Aaron has two types do iodine in his lab. He has brand 213 iodine, which costs 36 cents per ounce. He also has brand 856 iodine, which costs 1.58$ per ounce. How many ounces of brand 213 should be used if he has 63 ounces of brand 856 and wants to make a mixture that costs ...
*October 10, 2013*

**physics**

Spring on Incline The block in the figure is initially at rest on an inclined plane at the equilibrium position that it would have if there were no friction between the block and the plane. How much work is required to move the block 25 cm down the plane if the frictional ...
*October 9, 2013*

**world history**

the meaning of paleolithic age
*October 6, 2013*

**Spanish**

Thank you very much!
*September 22, 2013*

**Spanish**

I need to make each statement into a question using the interrogative words. Can someone revise the questions Adónde Cuándo Cuántos De dónde Dónde Por qué Qué Quién ¿ Dónde caminan Paco y Rosa? Paco y Rosa ...
*September 22, 2013*

**math **

We are doing improper fractions and they are talking about the Tee-pee method ,what is it
*September 17, 2013*

**physics lon capa **

A car starts from rest and travels for 4.93 s with a uniform acceleration of +1.53 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.99 m/s2. If the brakes are applied for 2.83 s, how fast is the car going at the end of the braking period?
*September 14, 2013*

**physics lon capa **

A car starts from rest and travels for 4.93 s with a uniform acceleration of +1.53 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.99 m/s2. If the brakes are applied for 2.83 s, how fast is the car going at the end of the braking period?
*September 14, 2013*

**physics**

-------------------------------------------------------------------------------- A tennis ball with a speed of 11.4 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 8.64 m/s. If the ball is in contact...
*September 14, 2013*

**Physics**

At t=0 a particle starts from rest at x=0, y=0 and moves in the xy plane with an acceleration a=(4.0i+3.0j)m/s^2. Determine (a) the x and y components of velocity, (b) the speed of the particle, and (c) the position of the particle, all as a function of time. (d) evaluate all ...
*September 12, 2013*

**chemistry**

A gas has a density of 5.56 g/L. a. What volume in milliliters would 4.17 g of this gas occupy? b. What would be the mass in kilograms of 1 m3 of this gas?
*September 11, 2013*

**chemistry**

A gas has a density of 5.56 g/L. a. What volume in milliliters would 4.17 g of this gas occupy? b. What would be the mass in kilograms of 1 m3 of this gas?
*September 11, 2013*

**chemistry**

A gas has a density of 5.56 g/L. a. What volume in milliliters would 4.17 g of this gas occupy? b. What would be the mass in kilograms of 1 m3 of this gas?
*September 11, 2013*

**Chemistry**

a chemist needs 2.00 grams of a liquid compound witha density of 0.785 g/cm^3 density. what volume of compund is required?
*September 3, 2013*

**Chemistry**

a chemist needs 2.00 grams of a liquid compound witha density of 0.785 g/cm^3 density. what volume of compund is required?
*September 3, 2013*

**math**

solve for x x-7/6=x+3/7
*August 20, 2013*

**Geometry **

If the distance from the top of a building to the tip of its shadow is 150 feet and the sun makes a 75 degree angle with the wall as shown in the image below, what is the length of the shadow?
*August 8, 2013*

**History**

Passed in 1935, Roosevelt's most significant reform measure was the
*August 4, 2013*

**math**

julia studied math for 3 1/3 hours during the 4 days before her last math test what was the average amount of time she studied each day
*May 14, 2013*

**Math**

The question I put in is all the information that was stated.
*May 4, 2013*

**Math**

A house.
*May 4, 2013*

**Math**

LeAnn is a carpet layer. She has agreed to carpet a house for $18 per square yard. The carpet will cost her $11 per square yard, and she knows that there is approximately 12% waste in cutting and matching. If she plans to make a profit of $580.80, how many yards of carpet will...
*May 4, 2013*

**math**

he purchased a total of 120 shares at a price of 3018 what was the unit price per share (4.2d)
*April 30, 2013*

**math**

3x-4y=-6 2x+6y=11
*April 28, 2013*

**Math**

What is the greatest number of points of intersection with three circles that have 6 intersections using four straight lines?
*April 25, 2013*

**Physics**

Two converging lenses are separated by 23.60 cm. The focal length of each lens is 12.60 cm. An object is placed 35.80 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right. Answer in cm
*April 23, 2013*

**Physics**

An object is placed 19.6 cm to the left of a diverging lens (f = -7.84 cm). A concave mirror (f = 11.2 cm) is placed 27.3 cm to the right of the lens Find the final image distance, measured relative to the mirror (cm)
*April 23, 2013*

**Algebra**

Solve the equation. Leave answer in simplest radical form. n^2-2n+1=5
*April 18, 2013*

**Physics**

A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +3.0. What is the magnification when the convex side is used as a mirror, the object remaining the same distance from the mirror?
*April 17, 2013*

**Physics**

Identical objects are located at the same distance from two spherical mirrors, A and B. The magnifications produced by the mirrors are mA = 7.2 and mB = 1.1. Find the ratio fA/fB of the focal lengths of the mirrors.
*April 17, 2013*

**Algebra**

A baseball player hits a baseball into the air with an initial vertical velocity of 48 feet per second from a height of 3 feet. 8. Write an equation that gives the baseball’s height as a function of the time (in seconds) after it is hit. 9. After how many seconds does the...
*March 31, 2013*

**Physics**

The power radiated by the sun is 3.90 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.50 1011 m. The earth's axis of rotation is tilted by 27° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator ...
*March 26, 2013*

**Physics**

A stationary particle of charge q = 1.4 10-8 C is placed in a laser beam (an electromagnetic wave) whose intensity is 3.5 103 W/m2. Determine the magnitudes of the (a) electric and (b) magnetic forces exerted on the charge. If the charge is moving at a speed of 3.7 104 m/s ...
*March 26, 2013*

**Physics**

A beam of polarized light with an average intensity of 17.1 W/m2 is sent through a polarizer. The transmission axis makes an angle of 27° with respect to the direction of polarization. Determine the rms value of the electric field of the transmitted beam. Answer in N/C
*March 26, 2013*

**chemistry quick question**

...just change the methyl part to ethyl.... 2-ethyl-4-heptanol!
*March 25, 2013*

**Physics**

A series circuit contains only a resistor and an inductor. The voltage V of the generator is fixed. If R = 10 Ω and L = 4.2 mH, find the frequency at which the current is one-half its value at zero frequency? Answer in Hz
*March 21, 2013*

**Physics**

That wasn't the right answer, but thank you anyways!
*March 21, 2013*

**Physics**

In the absence of a nearby metal object, the two inductances (LA and LB) in a heterodyne metal detector are the same, and the resonant frequencies of the two oscillator circuits have the same value of 510.0 kHz. When the search coil (inductor B) is brought near a buried metal ...
*March 21, 2013*

**Physics**

A series RCL circuit has a resonant frequency of 1530 Hz. When operating at a frequency other than 1530 Hz, the circuit has a capacitive reactance of 5.0 Ω and an inductive reactance of 33.0 Ω. What is the value of L? (Answer in H) What it the value of C? (Answer in F)
*March 21, 2013*

**Physics**

Suppose that the light bulb in the figure is a 61.8-W bulb with a resistance of 218 Ω. The magnetic field has a magnitude of 0.37 T, and the length of the rod is 0.59 m. The only resistance in the circuit is that due to the bulb. What is the shortest distance along the ...
*March 14, 2013*

**Chemistry**

The number of moles NaOH needed to reach the equivalence point is mol, which means we must add liters of NaOH. The total volume of solution at the equivalence point will be liters. From the above information, the molarity of NaF at the equivalence point is M.
*March 13, 2013*

**Lang. Arts**

Why do you have to be so rude!?
*February 26, 2013*

**Chemistry**

at a pressure of 390.0 kPa, a sample of ideal gas containing 110. moles of propane is collected at a tempature of 55 degrees celcius. find the volume of the propane tank used
*February 25, 2013*

**Chemistry**

at a pressure of 390.0 kPa, a sample of ideal gas containing 110. moles of propane is collected at a tempature of 55 degrees celcius. find the volume of the propane tank used
*February 25, 2013*

**Physics**

A particle of mass 6.80 10-8 kg and charge 4.4-µC is traveling due east. It enters perpendicularly a magnetic field whose magnitude is 29.0 T. After entering the field, the particle completes one-half of a circle and exits the field traveling due west. How much time does...
*February 22, 2013*

**Physics**

Two resistances, R1 and R2, are connected in series across a 15-V battery. The current increases by 0.050 A when R2 is removed, leaving R1 connected across the battery. However, the current increases by just 0.025 A when R1 is removed, leaving R2 connected across the battery. ...
*February 21, 2013*

**Physics**

A cylindrical aluminum pipe of length 1.52 m has an inner radius of 2.20 10-3 m and an outer radius of 3.00 10-3 m. The interior of the pipe is completely filled with copper. What is the resistance of this unit? (Hint: Imagine that the pipe is connected between the terminals ...
*February 21, 2013*