Sunday

May 29, 2016
Total # Posts: 277

**Chemistry**

A sample of hydrogen gas (H2) is produced in a laboratory by displacement of water. A 645 mL sample of hydrogen is collected at 25 degrees Celsius and a total pressure of 758 torr. Collecting gas by water displacement causes the gas to become saturated with gaseous water vapor...
*May 20, 2016*

**precalc**

use the sum to product formula to simplify sin 42degrees+sin 18 degrees=sin A degrees 0<A<90 degrees A=???degrees
*April 1, 2016*

**algebra word problem**

well, Two of the sides would have to be either 5 or 3. Because 5+5+6=16 and 5x6=30 or 3+3+10=16 and 3x10=30. Does this help?
*March 3, 2016*

**Math**

the number of blocks has 9 in the ones place. The number in the hundreds place is one more than the number in the tens place. Those two numbers equal 11. how many blocks are there.
*December 7, 2015*

**math-7th grade algebra**

Thanks i get it now.
*November 29, 2015*

**math-7th grade algebra**

thanks ms.sue but where did the 0.5 come from?
*November 29, 2015*

**math-7th grade algebra**

Bread has gone sale at the supermarket. the sale price is $3.50 per loaf and the original price was $4.00 per loaf? whats the percent decrease from original price to sale price?
*November 29, 2015*

**Algebra**

Austin drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 8 hours. When Austin drove home, there was no traffic and the trip only took 5 hours. If his average rate was 21 miles per hour faster on the trip home, how far away does ...
*November 1, 2015*

**algebra**

What is the axis of symmetry in -7/x^2-4
*July 30, 2015*

**algebra**

I get f(5)=2*5^2-20*5+5=2*25-100+5=50-100+5=55 not sure what doing wrong
*July 27, 2015*

**algebra**

f(x)=2x^2-20x+5 find vertex is(5,55)correct
*July 27, 2015*

**Math **

What is the relationship between the side length and the apothem of an equilateral triangle?
*July 13, 2015*

**Geometry **

What is the relationship between the side length and the apothem of an equilateral triangle?
*July 13, 2015*

**Geometry **

what is the relationship between the side length and the apothem in a regular hexagon?
*July 13, 2015*

**U.S. History**

Which statement BEST distinguishes the Viet Cong from the North Vietnamese Army? A) The North Vietnamese Army fought beside the allied forces, while the Viet Cong fought against the allied forces. B) The North Vietnamese Army represented the political interests of North ...
*July 1, 2015*

**U.S. History**

What effect did the demobilization that followed World War I have on the American workforce? A) Members of labor unions were viewed as disloyal and were monitored by the FBI. B) Thousands of women and African-Americans lost their jobs as returning servicemen reentered the ...
*July 1, 2015*

**Probability**

The numbers 1 to 15 are placed in a hat, and a number is selected. What is the probability that the number is 4 given it is known to be an even number?
*June 25, 2015*

**Probability**

If three people are randomly selected, find the probability that they will all have birthdays on the same day of the year.
*June 25, 2015*

**Physics**

The white ball in the figure has a speed of 1.67 m/s and the yellow ball is at rest prior to an elastic glancing collision. After the collision the white ball has a speed of 1.43 m/s. To the nearest tenth of a degree, measured counterclockwise from east, what angle does it ...
*April 19, 2015*

**Finance**

A caller informs you that it will take a $70,000 down payment and the investelemt will return $10,000 a year for the next 10 years. He tells you that you that the investment will return 14 percent. If current interest rates are 8 percent, what is the present value of this ...
*April 9, 2015*

**Geo**

What is state that only 2 seasons????
*March 7, 2015*

**calculus**

use a linear approximation to estimate (8.2)^(2/3)
*January 19, 2015*

**Calculus 1**

Write a function that has two infinite limits at two different x-values. Write a function where both one sided limits exist at some x value but the two sided limit do not. I don't understand how this would look, please help!
*January 13, 2015*

**algebra 2 help**

solve it again please? that was the answers idek
*January 12, 2015*

**algebra 2 help**

if 3abs(x+4)=8, then x=? A. {-10,2} B. {-2,2} C. {-19,11} D. {-22,-14} which one? idek I think is B but i am not sure help
*January 12, 2015*

**alegbra 2**

simplify the compound fraction: ((x+h)^(-3)-x^(-3))/(h)
*January 12, 2015*

**alegebra 2 Help**

thats the answer damon sum=x^3 +3hx^2 +3h^2x+ h^3
*January 12, 2015*

**alegebra 2 Help**

idek the next step damon
*January 12, 2015*

**alegebra 2 Help**

yes
*January 12, 2015*

**alegebra 2 Help**

simplify the compound fraction: ((x+h)^(-3)-x^(-3))/(h) where do i start?
*January 12, 2015*

**Algebra**

Find the number of decibels for the power of the sound given. Round to the nearest decibel. A rocket engine, 2.50 * 10^5 watts cm^2 what is the db?
*November 7, 2014*

**physics**

a horse is running with an initial velocity of 11m/s and begins to accelerate at -1.81m/s^2. how long does it take for the horse to stop?
*October 5, 2014*

**physics**

how long will it take the sound of the starting gun to reach the ears of the sprinters if the starter is stationed at the finish line for a 100 meter race? assume that the sound has a speed of about 340m/s.
*October 5, 2014*

**maths**

Sir, I am also getting this as the answer. but the options given are :- a). 2.45 b). 2.3 c). 1.33 d). 1.56
*August 29, 2014*

**maths**

A man goes upstream for a distance of 10 kms in 5 hours. Another man goes downstream the same distance of 10 kms in 3 hours. what is the difference in speeds of two men if the river speed is 0.5 km/hr
*August 29, 2014*

**ap chem**

At what angle (in degrees) must {111} planes of platinum (Pt) be exposed to a collimated beam of thee X-rays in order to obtain by diffraction monochromatic CrKα radiation. ---- I know the relation between d and h+k+l but what does it mean the collimated beam stuff?
*August 26, 2014*

**Finance**

4. Your program plans to acquire a total of 600 end items costing $535 million over a five-year period. The first production contract is to be awarded in FY04. The number of items to be procured (not delivered) each year and their estimated cost (in then-year dollars) is shown...
*August 1, 2014*

**physics**

a stone is projected upward with a speed of 80.0ft/s from a 224 ft tower. find the maximum height and the speed at which it strikes the ground.
*June 21, 2014*

**physics**

a rock is thrown vertically down from a bridge with an initial velocity of 30m/s and strikes the water in 2.0sec. find the velocity with which the rock strikes and the height of the bridge.
*June 20, 2014*

**physics**

a stone is thrown straight upward and rises to a maximum vertical height of 40.0m. with what velocity was it thrown and how long does it take for the stone to return to the initial level from which it was thrown?
*June 20, 2014*

**physics**

a steel ball dropped from a tower strikes the ground in 3.0 seconds. Find the velocity with which the ball strikes the ground and the height of the tower in meters.
*June 20, 2014*

**physics**

at the start of a race , a horse accelerates out of the gate at a rate of 3.00m/s squared. how long does it take the horse to cover the first 25.0m of the race?
*June 20, 2014*

**physics**

on a trip a car covers 42.3 miles in 40.0 minutes. find the average velocity in m/s and km/hr
*June 13, 2014*

**physics**

A boy on a motor scooter is traveling at a velocity of 14.1 m/s when he applies his brakes in order to stop. How much time will it take him to stop if he slows down at a rate of 3.2 m/s2?
*June 11, 2014*

**physics**

A motorist is driving at a constant velocity of 28 m/s when he decides to pass a car that is in front of him. He accelerates at a rate of 2.5 m/s2 for 3.0 seconds while passing the car. What is his velocity at the end of the 3.0 seconds?
*June 11, 2014*

**Chemistry**

Please help me solve this empirical formula.Im so confused C=58.5% H=4.1% N=11.4% and O=26.0% Thank you so much
*May 3, 2014*

**Government**

family
*May 2, 2014*

**physics**

An infinitely long thin metal strip of width w=12cm carries a current of I=10A that is uniformly distributed across its cross section. What is the magnetic field at point P a distance a=3cm above the center of the strip as shown? This one requires some integration! I suggest ...
*April 7, 2014*

**physics**

A series RLC circuit is made with a C=100pF capacitor, an L=100μH inductor, and an R=30Ω resistor. The circuit is driven at 5×106rad/s with a 1V amplitude. What is the current oscillation amplitude in amps
*April 6, 2014*

**physics**

A series RLC circuit is made with a C=100pF capacitor, an L=100μH inductor, and an R=30Ω resistor. The circuit is driven at 5×106rad/s with a 1V amplitude. What is the current oscillation amplitude in amps
*April 6, 2014*

**physics**

Consider a coaxial cable with 2Amps in the center conductor coming out of the page, and 1Amp in the outer conductor going into the page. The center conductor has a radius of 1mm, the outer conductor's inner radius is 2mm, and the outer conductor's outter radius is 3mm...
*April 6, 2014*

**statistics**

Suppose the average body temp is 98.6 assume the variable is normally distributed with a standard deviation of .74 degrees. suppose a sample of 100 is taken. what is the probability that the mean is below 98.4??? Between 98.5 AND 98.7??
*March 21, 2014*

**statistics**

the average act score submitted to a certain university is 26. to be eligible for admission, a student must score in the top 6% of applicants. if the scores are normally distributed with a standard deviation of 2.4, what is the minimum score needed to be considered for admission?
*March 21, 2014*

**Physics**

A baggage cart full of luggage is coasting at a speed vA across the airport taxiway. When eighteen percent of the mass of the cart and luggage is thrown off the cart, parallel to the ground and in the forward direction, the cart is brought to a halt. If the direction in which ...
*March 3, 2014*

**Physics**

A hailstone traveling with a velocity of 43 meters/second comes to a virtual stop 0.28 seconds after hitting water. What is the magnitude of its acceleration in the water?
*January 31, 2014*

**English**

I e-mailed him yesterday. This is the correct answer.
*January 5, 2014*

**math**

can some one tell me the simplified cube radical form of (64x^5y^7)^1/3
*October 9, 2013*

**Physics**

Automobile Airbags. The human body can survive an acceleration trauma incident (sudden stop) if the magnitude of the acceleration is less than 250 m/s2. If you are in an automobile accident with an initial speed of 60 km/h (37 mi/h) and you are stopped by an airbag that ...
*September 9, 2013*

**Social studies**

In which colony were people most likely to make their living by fishing. A. New Hampshire B. North Carolina C. Pennsylvania D. Massachusetts E. Virginia I put d am I correct
*September 2, 2013*

**Mathis**

I am sooty I made a mistake with the question it is 187 not 186 and I still don't understand where you get 7 and 9 from
*August 21, 2013*

**Mathis**

Fiona is dissatisfied with her current weekly salary. If she received a raise of $0.50 per hour and worked an additional 4 hours each week her weekly salary would then be $500. What is Fiona current salary a) $380 b)$400 c)$420 d)440 e) not e ought information I put d can you ...
*August 21, 2013*

**Physics**

Wrong answer
*July 15, 2013*

**pyhsic question for count iblis**

ibis ,I beg to differ,the door slowly open because the ball bounces back elastically,please don't be certain,when u are wrong
*May 22, 2013*

**Science**

6.58
*May 20, 2013*

**Physics**

26.5
*May 6, 2013*

**math**

alicie plans to use a square iece of plywood forthe tabletop. She wants to put tiles on each outside edge of th taletop Each tile measures 2 inche by 2 inches of each outside edge of teh tableop
*March 26, 2013*

**science**

According to Newton's second law of motion, _____? A. F = mv B. F = m/a C. a = Fnet /m D. F = ma I think it is B..?
*March 14, 2013*

**economics?**

If you were president, would you be more interested in your economic advisors' positive views or their normative views ? Why ?
*March 11, 2013*

**Math**

3 times the square root of 4/9
*March 9, 2013*

**not sure where to begin**

In what ways is your standard of living different from that of your parents or grandparents when they were your age? Why have these changes occurred ?
*March 7, 2013*

**pre alger**

Suppose that a car normally sells for $16,500 and is now on sale for $14,000. What is the percent of discount? If necessary, round your answer to the nearest tenth.
*March 5, 2013*

**biology**

Think of diets from an energy perspective. Where is the energy coming from, and how many organisms does it move through before it gets to the human? In what form is most of the energy in when it gets to the human, and how is that energy unleashed by the body?
*March 1, 2013*

**biology**

Apply the Law of Conservation of Energy to food. Trace the energy from its beginning point, to the point where it was stored or used.
*March 1, 2013*

**biology**

Apply the concept of RESPIRATION. What happens inside of a human being when he or she eats various foods? During Respiration, is the energy in the food converted into heat, or into some other chemical (name the chemical!)
*March 1, 2013*

**aCCOUTNING**

explain how improperly counting ending inventory affects the income statement and the balance sheet
*February 27, 2013*

**biology**

Can a snail survive in an aquarium with no living plants in it? What do fish owners do to compensate if their aquarium has no plants?
*February 23, 2013*

**biology**

oh, a snail and Elodea
*February 23, 2013*

**biology**

27. Pretend you are a carbon atom that was part of a molecule of CO2 dissolved in the water at the beginning of the experiment. Describe a path you could take through both organisms in this experiment, including the molecules you would be a part of and the chemical reactions ...
*February 23, 2013*

**biology**

People with a lactose intolerance are able to take products such as Lactaid that contain the lactase enzyme with their meals. These products can be taken in pill form. Considering the fact that the pill form of the enzyme would have to travel through the person's stomach, ...
*February 17, 2013*

**biology**

substrate concentration and pH affect enzyme activity. Is there another environmental condition you think could affect enzyme activity How would you test your hypothesis?
*February 17, 2013*

**biology**

30. Enzymes function most efficiently at the temperature of a typical cell, which is 37 degrees Celsius. Increases or decreases in temperature can significantly lower the reaction rate. What does this suggest about the importance of temperature-regulating mechanisms in ...
*February 17, 2013*

**economics**

data collected in the imaginary economy of karabekiar reveals that when price of bork increased by 20%, the quantity of bork sold decreased by 15% and the quantity of perf demanded decreased by 10% what is the cross-price elasticity of demand between perf and bork?
*February 7, 2013*

**math--please check**

Change the logarithmic equation to an equivalent equation involving an exponent. log8^64=2 **note that the 8 should be lower than the g** 8^(log64)=8^2 64=8^2 is this correct
*January 9, 2013*

**math/calculus**

solve the equation loga(x-5)- loga (x+9)=loga(x-7)-loga(x+9) all a's are lower please show work
*January 7, 2013*

**math**

solve the following exponential equation e^x-4=-e^-x please show work
*January 7, 2013*

**math/calculus**

The function f is defined as follows: f(x)={x+6 if -5 less than or equal to x<1 f(x)={9 if x=1 f(x)={-x+5 if x>1 a. find the domain b. locate any intercepts, if any
*January 6, 2013*

**Chemistry**

"You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 165.0 ppm and is initially uniform through the thickness of the steel. The ...
*December 15, 2012*

**Physics**

1. If a bar magnet is broken into two pieces, how many magnetic poles are there? 2. A long straight wire carries a current in the direction shown in the following figure. At the point labeled A, is the direction of the magnetic field left, right, up. Down, into the page, or ...
*October 29, 2012*

**Chemistry**

Given 1.01 g of H2 in the reaction H2 + 1/2 O2 = H2O. The Delta H for solution is 143 kJ. What is the delta H for the reaction?
*October 20, 2012*

**math**

A box with a square base and no top is to be made from a square piece of cardboard by cutting 4-in. squares from each corner and folding up the sides, as shown in the figure. The box is to hold 196 in3. How big a piece of cardboard is needed?
*September 3, 2012*

**math**

A wire 320 in. long is cut into two pieces. One piece is formed into a square and the other into a circle. If the two figures have the same area, what are the lengths of the two pieces of wire (to the nearest tenth of an inch)?
*September 3, 2012*

**math**

Two fishing boats depart a harbor at the same time, one traveling east, the other south. The eastbound boat travels at a speed 1 mi/h faster than the southbound boat. After nine hours the boats are x = 45 mi apart. Find the speed of the southbound boat.
*September 3, 2012*

**math**

Wendy took a trip from city A to city B, a distance of 560 mi. She traveled part of the way by bus, which arrived at the train station just in time for Wendy to complete her journey by train. The bus averaged 40 mi/h, and the train averaged 110 mi/h. The entire trip took 10 1 ...
*September 3, 2012*

**physics**

A small mailbag is released from a helicopter that is descending steadily at 1.01 m/s. (a) After 4.00 s, what is the speed of the mailbag? v = m/s (b) How far is it below the helicopter? d = m (c) What are your answers to parts (a) and (b) if the helicopter is rising steadily ...
*August 30, 2012*

**physics**

A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? m (b) How long does it take to reach its highest point? s (c) How long does the ball take to hit the ground after it reaches its highest point? s (d) What is its velocity when it returns to...
*August 30, 2012*

**physics**

An object moves with constant acceleration 3.65 m/s2 and over a time interval reaches a final velocity of 10.4 m/s. (a) If its initial velocity is 5.2 m/s, what is its displacement during the time interval? m (b) What is the distance it travels during this interval? m (c) If ...
*August 30, 2012*

**physics**

Runner A is initially 9.0 mi west of a flagpole and is running with a constant velocity of 2.0 mi/h due east. Runner B is initially 5.0 mi east of the flagpole and is running with a constant velocity of 5.0 mi/h due west. How far are the runners from the flagpole when they meet?
*August 29, 2012*

**physics**

A car traveling east at 42.4 m/s passes a trooper hiding at the roadside. The driver uniformly reduces his speed to 25.0 m/s in 4.00 s. (a) What is the magnitude and direction of the car's acceleration as it slows down?
*August 29, 2012*