Friday

February 24, 2017
Total # Posts: 857

**Chemistry**

Find the ratio of the volumes of NaC3H5O3 soloution to HC3H5O3 (lactic acid) required to prepare a buffer with a pH of 3.90. the solutions are equal in molarity. Ka = 1.4 x 10-4 for HC3H5O3. ratio = ________ mL of NaC3H5O3 per mL of HC3H5O3

*February 22, 2017*

**Chemistry**

Find the pH of a buffer solution with equimolar concentrations of: HCOOH and NaCOOH (Ka = 3.5 x 10-4 for HCOOH)a

*February 22, 2017*

**Algebra**

If there are 8 sharpeners in every box, is the formula that relates s Sharpeners and B boxes B=8s or S=8B?

*February 11, 2017*

**Algreba **

Write an equation of the line that passes through the given point and is perpendicular to the given line (2,3), x+2y=-7

*January 26, 2017*

**history**

how did america's economy change after the civil war.

*January 9, 2017*

**Geometry**

What's the lateral area of a right cylinder if the radius of the base is 12 mm and the altitude of the cylinder is 5 times the base radius?

*December 29, 2016*

**science**

How do scientists explain the fact that some landforms that are far apart and separated by oceans appear to be related?

*December 14, 2016*

**Chemistry**

Consider two equally sized balloons at room temperature, one filled with oxygen gas and one filled with an unknown gas. If the balloon filled with oxygen gas deflates in 37 hours and the other balloon deflates in 26 hours, which of the following is the most likely identity of ...

*December 10, 2016*

**Chemistry**

this man is a savage ^

*December 9, 2016*

**Chemistry**

If 2.00 g of element G reacts with 5.00 g of element M to produce 7.00 g of a compound with the formula G3M2, what is the atomic mass of G if the atomic mass of M is 135.0 amu? Answer is 36 amu but why

*December 9, 2016*

**Chemistry**

If the change in temperature of a sugar added solution of water increased its boiling point by 0.6C how many moles of sugar was added to the water?

*November 28, 2016*

**Physics**

a softball batter hits a fly ball that is caught 3.8 seconds later, 88m from home plate. The ball is caught at the same height from which it was thrown. What was its initial velocity? What is the maximum height above its launch point that it reached?

*November 8, 2016*

**Mathematics**

Butt

*October 30, 2016*

**Math**

A teacher has 27 students in her class.she asks the students to form as many groups of 4 as possible.how many students will not be in a group

*October 12, 2016*

**Algebra**

Thanks and its burrito is 3 and taco is 2 right ?

*September 19, 2016*

**Algebra**

You and a friend eat tacos. You order 2 tacos and 5 burritos which equals $19. Your friend orders 1 taco and 4 burritos which equals $14. Find the cost of a taco and a burrito. Please help

*September 19, 2016*

**Integrated Math**

If (c) were f(x)=-4/(k+7) what value of k would be excluded from the domain? I know that we cant have 0 in the denominator. I solved the following: k+7=0 Value cannot be -7

*September 18, 2016*

**algebra**

How do I solve d=ut+(1/2)at^2

*September 12, 2016*

**Organic chemistry**

How many nodes are in the pi* orbital of a carbon-carbon double bond? Please explain. Thanks in advance.

*September 7, 2016*

**math**

Eight people rob a bank: What percent of the loot belongs to three people if they decide to share it evenly

*July 29, 2016*

**Economics/Finance**

How much Jim can accumulate in a private pension fund over 20 years if the fund offers 5% interest compounded annually, and he can afford to deposit&...

*July 4, 2016*

**physics**

an initially resting 300g car is dragged along a horizontal frictionless table by a massless cord. The cord is attached to vertically hanging 60g mass by a frictionless massless pulley. If the car starts from rest, determine the time it would take for it to move 20 cm.

*June 2, 2016*

**math**

a board of 4 members is going to be formed from the 30 students of a class. The board is formed of a president a vice president a secretary and a treasurer. What is the number of possible boards knowing that each of the 30 students can occupy any post?

*April 24, 2016*

**math**

four girls bought each a swimsuit and decided to borrow among themselves. How many possible ways can they dress up knowing that each girl can use the same swimsuit only once?

*April 24, 2016*

**math(counting)**

an anagram of a word is obtained by permuting its letters. a-how many anagrams does the word "MAIRE" have b-Same question for the word "OISEAU"

*April 24, 2016*

**math(counting)**

in how many different ways can 3 boys and 2 girls sit on a bench? in how many different ways can they sit knowing that the boys have to sit near each other and the girls also

*April 24, 2016*

**Math**

I don't know

*April 20, 2016*

**Geometry- PLEASE HELP!!**

Point $G$ is the midpoint of median $\overline{XM}$ of $\triangle XYZ$. Point $H$ is the midpoint of $\overline{XY}$, and point $T$ is the intersection of $\overline{HM}$ and $\overline{YG}$. Find the area of $\triangle MTG$ if $[XYZ] =150$.

*April 19, 2016*

**Geometry**

Altitudes $\overline{XD}$ and $\overline{YE}$ of acute triangle $\triangle XYZ$ intersect at point $H$. If the altitudes intersect at a $123^\circ$ angle, and $\angle YXH = 26^\circ$, then what is $\angle HZX$ in degrees?

*April 19, 2016*

**Math**

Points J and K, plotted on the coordinate grid, are two vertices of rectangle JKLM. Rectangle JKLM has an area of 7 square units. Point J is located at (2, 1) and point K is located at (-5, 1). Each vertex of the rectangle is located at a point that has integer coordinates.

*April 11, 2016*

**science**

did you find out yet

*April 11, 2016*

**Algebra**

AAAAAAAhhHHHH I need a answer too

*April 7, 2016*

**stas**

find the probability of correctly answering the first 2 questions on a multiple choice test if random guesses are made and each question has six possible answers

*April 4, 2016*

**English**

*than

*March 30, 2016*

**English**

#1 means it took him 5 days to read the book. In other words. He finished the book in 5 days. #2 means he waited 5 days to START reading the book. It doesn't mean he finished reading the book from what I can tell. #3 probably means he finished reading the book in LESS Than...

*March 30, 2016*

**Science**

The force in the horizontal direction doesn't affect the mass. You would need to know the force of gravity (in newtons) on the box and the acceleration of gravity which is 9.8m/s^2 on Earth.

*March 30, 2016*

**Algebra 2**

Q: What represents the sum of a geometric series with 8 terms whose first term is 3 and common ratio is 4. A: 65,535 Is my answer right? I wasn't sure when adding up the terms versus using Sigma notation.

*March 7, 2016*

**science fair**

will a heavy metal spring launch a baseball 7 feet in the air with 5 pounds of preasure

*March 6, 2016*

**Chemistry**

A 3.50L balloon contains 0.178 mol of gas. If 0.094 mol of gas is added to the balloon, what will be the new volume?

*March 2, 2016*

**physics**

A rocket blasts off from rest and attains a speed of 49 m/s in 16 s. An astronaut has a mass of 56.3 kg. What is the astronaut's apparent weight during take off?

*February 8, 2016*

**Physics**

A 1000-kg aircraft going 25 m/s collides with a 1500-kg aircraft that is parked. They stick together after the collision and are moving at 10 m/s. If they skid for 30 seconds before stopping, how far (in meters) did they skid? Hint: Are the aircraft moving at a constant ...

*January 30, 2016*

**Chemistry**

9.299 grams

*January 26, 2016*

**Chemistry**

Molar mass of H2O = 18.0 g/mol 18 g ------> 6.02x10^23 atoms g -------> 3.11x10^23 atoms ( 3.11x10^23) * 18 / 6.02x10^23 5.598x10^24 / 6.02x10^23 = 9.299 gramas hope thi helps!.

*January 26, 2016*

**Chemistry**

Percent of gas (C2H2 ) formed.

*January 26, 2016*

**Chemistry**

What is the percentage of gas (C2H2) formed when 2.66g of calcium carbide (CaC2) reacts completely with 50g water?

*January 26, 2016*

**math**

how long would it take a car traveling 175 mph to go 26 miles?

*January 24, 2016*

**Chemistry**

Calculate the equilibrium constant for the equilibrium knowing that there are 2 moles of O2 H2, 6 moles of O2 and 3 moles of H2O in a jar reactor 2L? 2 H2 + O2 = 2 H2O

*January 21, 2016*

**Math**

WTF YOU ALL GOT IT WRONG LOL I GOT A 3/18 WTF

*January 19, 2016*

**Algebra**

Nevermind guys, I solved it. For future strugglers: equation A: 3a+12s=262.5 equation B: 4a+8s=230 multiply equation B so that a variable can be negated when you add the two equations together. In this case I chose variable (S) so i multiplied equation B by -1.5 so that -3a=-...

*January 19, 2016*

**Algebra**

Math club purchased 3 adult tickets and 12 student tickets for $262.50. Physics club purchased 4 adult tickets and 8 student tickets for $230.00. How much do the adult and student tickets cost?

*January 19, 2016*

**Maths**

The nth term and the sum of n terms of a geometric sequence are 5 and 55 respectively. If the commom ratio is -(1/2)n find the first term and value of n

*January 13, 2016*

**Math**

If a person throws 3 darts at a dartboard, how many possible combinations are there to get a sum of 34?

*January 5, 2016*

**Physics**

A baseball player hits a home run over the left-field fence, which is 104 m from home plate. The ball is hit at a point 1.08 m directly above home plate, with an initial velocity directed 35.0° above the horizontal. By what distance does the baseball clear the 3.00 m high ...

*December 8, 2015*

**US History**

probaly england

*December 2, 2015*

**math**

how much dose 1 cup of sugar cost?

*December 2, 2015*

**Chemestry**

Iron metal reacts with oxygen gas to form rust, iron (III) oxide. Which of the following correctly shows the balanced equation for this reaction?

*December 2, 2015*

**math help pls pls**

the answer is sometimes i recommend you google it first

*December 2, 2015*

**Algebra**

17n+11 - (5n+6) - (4n+5) =9

*November 28, 2015*

**Calculus**

The amount remaining of a radioactive substance after t hours is given by A(t) = 100ekt. After 12 hours, the initial amount has decreased by 4%. How much remains after 48 hours? What is the half-life of the substance?

*November 23, 2015*

**Physics**

Damon, Where do you suggest I look for an approximate mph figure. I realize we are ignoring key factors, but surely someone can give me an educated guess - - e.g. the body would hit the ground at 100 mph plus or minus 10 mph. Thanks

*November 20, 2015*

**Physics**

A 180 pound body is dropped from a helicopter 5 miles (26400 ft.) up - - what maximum speed would the body attain, in miles per hour, before hitting the ground? Disregard gravity, air density, etc. factors, a very rough approximation is all that is needed. Thanks.

*November 20, 2015*

**Physics**

If a 180 pound body is dropped from an airplane 5 miles (26400 ft.) up: a/ how long would it take for the body to reach the ground? b/ what would be the maximum speed the body would attain in miles per hour? Close approximations are all that are required here. Thanks.

*November 20, 2015*

**Physics**

If a 180 pound body was dropped from a plane 5 miles in the air - how long would it take for the body to reach the ground?

*November 19, 2015*

**math**

Independent random samples, each containing 800 observations, were selected from two binomial populations. The samples from populations 1 and 2 produced 320 and 400 successes, respectively. Construct a 90% confidence interval for the true difference in population proportions ...

*November 18, 2015*

**math**

Suppose x has a binomial probability distribution with n = 200 and p = 0.60. Use the normal approximation to the binomial to find P (X > 130).

*November 18, 2015*

**Physics**

The instruments attached to a balloon have a mass of 5kg. The balloon is released and exerts an upward force of 100 N. After the balloon has accelerated for 10s, the instruments are released. What is the velocity of the instruments at the moment of release?

*November 2, 2015*

**Physics**

The driver of a car is going 90 km/hr suddenly sees a barrier40m ahead. It takes the driver .75 sec to apply the brakes, and the average acceleration during braking is -10m/s^2. Will the car hit the barrier and use calculation to show work.

*October 31, 2015*

**Physics**

10.234234

*October 29, 2015*

**Trig**

mercury rotates around the sun in approx. 89 earth days (or 7,689,600 s. use a calculator to approximate its angular speed. choices: 4.09x10^-7 0.035 0.071 8.17x10^-7

*October 21, 2015*

**Did you read The Pig Man And Me**

John Quinn does not explain the rule about the paddle to Paul, the narrator of “The Pigman & Me.” How does this one action affect the rest of the essay?

*October 11, 2015*

**HELP SCIENCE ASAP**

How are fish, amphibians, reptiles, and birds alike? How are they different? Include at least two similarities and two differences.

*October 7, 2015*

**ela**

Which section of a personal narrative requires the most development? a. introduction b. conclusion c. character introduction d. plot my answer is a can you check it for me

*October 5, 2015*

**ELA HELP FAST**

Which section of a personal narrative requires the most development? a. introduction b. conclusion c. character introduction d. plot

*October 5, 2015*

**Social Studies**

what do you mean

*October 5, 2015*

**Social Studies**

What examples are given of a limited government and an unlimited government in the section? How did each type of government affect its citizens? Japans government

*October 5, 2015*

**Math**

24÷8+4×3=6

*September 15, 2015*

**History**

Its fine i got my dad to help me. Thank you

*September 13, 2015*

**History**

"The renewable energies roadmap unveiled earlier this month by the Commission sets a target of 20% for the share of total energy supply to come from renewable sources. “It is not the first time that targets for renewable energy have been fixed. In 1997, the European ...

*September 13, 2015*

**psychology**

Dr. Jefferson is conducting an experiment in which she is interested in the effects of caffeine on visuospatial ability in adult participants. She conducts an experiment in which she gives one group a pill containing 20mg of caffeine and a second group a placebo pill. One hour...

*September 13, 2015*

**Psychology**

A researcher has conducted an experiment in which she has given participants a placebo, 10mg, and 20mg of a drug. She then measured their anxiety, blood pressure, and heart rate in response to the drug. How many levels does this experiment’s independent variable have?

*September 13, 2015*

**Psy 326**

We use _______________ to communicate the patterns and distribution of our measured variables.

*August 24, 2015*

**physics**

A bird watcher meanders through the woods, walking 0.744 km due east, 0.925 km due south, and 3.97 km in a direction 18.3 ° north of west. The time required for this trip is 1.765 h. Determine the magnitudes of the bird watcher's (a) displacement and (b) average ...

*August 14, 2015*

**Physics**

Knowing that you have the mass of each sun, M1=M2=M which is 2x10^30 kg, and you have the distance between the two stars a=1 AU, you can use Kepler's third law to solve for the period in seconds: p^2=((4pi)^2(a)^3)/(Gm) where p is measured in seconds, a is measured in ...

*August 14, 2015*

**physics**

A bird watcher meanders through the woods, walking 0.544 km due east, 0.925 km due south, and 3.58 km in a direction 17.3 ° north of west. The time required for this trip is 1.957 h. Determine the magnitudes of the bird watcher's (a) displacement and (b) average velocity.

*August 12, 2015*

**Langauge Please Help**

The novel to kill a mockingbird feature a main character named scout. Scout is also the voice that tells the story. What point of view is used in the novel? A.First Person B.Third-Person Limited<----------- C.Third-Person Omniscient The prefix a- can mean "none" ...

*August 11, 2015*

**Math**

A ball is thrown, and its height is recorded a number of different times. The ball reaches a maximum height of 20 m after 1.5 s. How do you sketch this relation from just a vertex. Grade 11 functions

*July 18, 2015*

**Math- algebra**

An experiment stain of bacteria is being used to treat an oil spill. A colony of 2^13 cells will be sufficient to ocean up the spill. If the colony is started with a single cell, and cells increase in number by splitting every 15 minutes, in how many hours will the colony ...

*June 5, 2015*

**Chemistry**

i like chicken oh yes i do

*May 9, 2015*

**Math**

430

*May 5, 2015*

**Algebra 2**

An object is moving at a speed of 3 + 2 𝑓𝑡/𝑠. How long would it take the object to travel 20 𝑓𝑡? [looking for actual solution and not decimal approximation]

*May 1, 2015*

**Chemistry physics**

3.25x10-3 kg of gold is deposited onto the negative electrode of an electrolytic cell in a period of 2.78 hours, what is the current through this cell in amperes? Assume that the gold ions carry one elementary unit of charge

*March 31, 2015*

**Physics**

If 3.25x10-3 kg of gold is deposited onto the negative electrode of an electrolytic cell in a period of 2.78 hours, what is the current through this cell in amperes? Assume that the gold ions carry one elementary unit of charge

*March 31, 2015*

**Math**

Would it be 122?

*March 15, 2015*

**Math**

If the standard error of measurement is 3, and a person scores 125, Standard error of measurement with one standard deviation would put the score at ____?

*March 15, 2015*

**math**

A rectangular piece of carpet is place on the floor of a rectangular room leaving a margin of 1 m around it. If the room measures 8 m by 6 m find the area of the room not covered by the carpet.

*March 10, 2015*

**Physics**

Carl hits a 0.05 kg golf ball giving it a speed of 65 m/s. What impulse does he impact to the ball?

*March 6, 2015*

**Calculus (Partial Derivatives)**

A car dealer determines that if gasoline-electric hybrid automobiles are sold for x dollars apiece and the price of gasoline is y cents per gallon, then approximately H hybrid cars will be sold each year, where H(x,y)=6000−13x^(1/2)+2(0.1y+20)^(3/2). She estimates that t...

*March 4, 2015*

**Calculus (Partial Derivatives)**

A car dealer determines that if gasoline-electric hybrid automobiles are sold for x dollars apiece and the price of gasoline is y cents per gallon, then approximately H hybrid cars will be sold each year, where H(x,y)=6000−13x^(1/2)+2(0.1y+20)^(3/2). She estimates that ...

*February 28, 2015*

**Calculus (Partial Derivatives)**

It's supposed to be Q(x,y)=40xy^(1/5)

*February 28, 2015*