Saturday

December 10, 2016
Total # Posts: 934

**Chemistry**

What is initial concentration of a sodium acetate if the pH (at epuilibrium) is measured to be 9.30?

*March 20, 2012*

**chemistry**

Calculate the pH of a 0.87 M NaCN solution. Solve it exactly (no assume x=0.1)

*March 20, 2012*

**6 grade math **

how do you work out this problem, find the height of a parallelogram with an area of 224 square meters and a base of 16 meters.show work please thank you

*March 19, 2012*

** 6 grade math**

how do you find the height of a triangle with an area of 245 square inches and a base of 14 inches.

*March 19, 2012*

**6 grade math**

find the height of a triangle with an area of square inches and a base of 14 inches

*March 19, 2012*

**6 grade math**

yes

*March 19, 2012*

** 6 grade math**

how do you find the height of an area of 245 square inches and a base of 14 inches.

*March 19, 2012*

**Chemistry**

Which of the following would you add to a mixture of CaCO3(s) and its saturated solution to increase the molar solubility of CaCO3: more water, Na2CO3, NaOH, NaHSO4? Explain.

*March 19, 2012*

**chemistry**

A solution is saturated with Ag2CrO4. a) Calculate [CrO4^2-] in this saturated solution. b) What mass of AgNO3 must be added to 0.635 L of the solution to reduce [CrO4^2-] to 1.0* 10^-8M?

*March 19, 2012*

**physics**

5.6kg

*March 19, 2012*

**statistics**

dsva

*March 19, 2012*

**Living environment**

acidic substance secreted by glands in the stomach wall is it pepsin enzyme that breaks down starch into maltose is it salivary amylase organ in which bile is stored is it gallbladder

*March 13, 2012*

**chemistry**

Ca(OH)^2 does not completely dissociate. It only partially dissotiates in water to form OH- and Ca+2. An equilibrium mixture of Ca(OH) and its dissolved ions is found to have a pH= 10.3 what is Kc for this dissociation?

*March 13, 2012*

**Science**

Describe a hybrid plasmid. What is this?

*March 12, 2012*

**Stats**

a coin is tossed twice, or until the first "tails" appears, whichever comes first. which of the following is the sample space for this random experiment? A, S=(H, T) B. S=(T, HT, HH) C. S=(T, TT)

*February 23, 2012*

**statistics**

The data listed below shows the number of hospitals in each state, using the data, complete a frequency table using 8 classes. all the data has been ordered from smallest to largest. 7,8,12,14,14,15,15,15,19,21,23,25,29,30,34,36,36,38,40,40,51,53,55,56,59,61,63,71,73,74,75,76,...

*February 22, 2012*

**statistics**

The data listed below shows the number of hospitals in each state, using the data, complete a frequency table using 8 classes. all the data has been ordered from smallest to largest. 7,8,12,14,14,15,15,15,19,21,23,25,29,30,34,36,36,38,40,40,51,53,55,56,59,61,63,71,73,74,75,76,...

*February 22, 2012*

**perimeter problems math**

janet built a 5-inch ny 7-inch rectangle A:what is the perimeter of janets rectangle? B:the perimeter of olivia's rectangle is 150% as long as janet's. what is the perimeter of olivia's rectangle? C. what is the area of janets rectangle? D.the area of walters ...

*February 21, 2012*

**algebra**

28 decreased by 6 times a number is the same as the number

*February 18, 2012*

**IB MATH STUDIES IA**

I meant actually who has better memory

*February 13, 2012*

**IB MATH STUDIES IA**

I am finding whether men or women are smarter. I am doing a chi-squared test to see if theres a correlation. What other sophisticated processes can i do?

*February 13, 2012*

**English**

Find The Subject and Verb in this sentence. Candle wax dripped onto the table and hardened into pools.

*January 31, 2012*

**chemistry**

Hmm idk the answer

*January 31, 2012*

**English**

What is the syntax in,bending, I bow my head and lay my hand upon her hair, combing and think how do woman do this for each other.

*January 18, 2012*

**Math**

The endpoints of one diagonal of a The The endpoints of one diagonal of a rhombus are (0, -8) and (8, -4). If the coordinates of the 3rd vertex are (1, 0), what are the coordinates of the 4th vertex? (7, -12) (7, -8) (-8, -4) (-4, -12)

*January 18, 2012*

**Algebra I**

(3x to the fourth - 5x squared - 6x +5) + (-4x cubed + 6x squared + 7x -1)

*January 17, 2012*

**math**

i don't know that's what i need help with

*January 15, 2012*

**science-VERY URGENT**

No, don't pick b because it's an isolating situation.

*December 11, 2011*

**science-VERY URGENT**

I would say C. No promises though. But go with c

*December 11, 2011*

**science-VERY URGENT**

Yeah hummingbirds is the answer

*December 11, 2011*

**science-VERY URGENT**

Hummingbirds. They have a huge beak thing to poke down the long tube. And they love red. Mice come out at night Bees have to land

*December 11, 2011*

**Biology**

Probably rough endoplasmic reticulum. An enzyme is a protein. You call it rough because it is studded with ribosome units. Ribosomes make proteins. More protein "factories" equals more enzyme to be released Note: Lysosome's are were you send proteins to be destroyed

*December 11, 2011*

**MATH**

SUPPOSE IT TAKES NO MORE THAN 25 MIN FOR YOU TO GET TO SCHOOL. IF YOU HAVE TRAVELED FOR 13.5 MIN ALREADY, HOW MUCH LONGER, AT MOST, MIGHT YOU TAKE TO GET TO SCHOOL? PLS HELP ME. I NEED TO SOLVE AN INEQUALITY THAT MODELS THIS PROBLEM. THANKS

*November 30, 2011*

**MATH**

THE AVERAGE WIND SPEED INCREASED 19 MILES/H FROM 8 AM TO 12 NOON. THE AVERAGE WIND SPEED DECREASED 5 MI MI/H FROM 12 NOON TO 4 PM. AT 4 PM, THE AVERAGE WIND SPEED WAS AT LEAST 32 MI/H. WHAT IS THE MINIMUM VALUE OF THE AVERAGE WIND SPEED AT 8 AM? NEED TO SOLVE AN INEQUALITY ...

*November 30, 2011*

**math, inequalties**

THIS SEASON, NORA HAS 125 AT BATS IN SOFTBALL. BY THE END OF THE SEASON SHE WANTS TO HAVE AT LEAST 140 AT BATS. HOW MANY MORE AT BATS DOES NORA NEED TO REACH HER GOAL? PLEASE HELP, I NEED TO WRITE AND SOLVE AN INEQUALITIES THAT MODEL THE SITUATION. THANKS

*November 30, 2011*

**math, inequalties**

IT WILL TAKE AT LEST 360 POINTS FOR KIKO'S TEAM TO WIN THE MATH CONTEST. THE SCORES FOR KIKO'S TEAMMATES WERE94, 82, AND 87, BUT ONE OF KIKO'S TEAMATES LOST 2 OF THOSE POINTS FOR AN INCOMPLETE ANSWER. HOW MANY POINTS MUST KIKO EARN FOR HER TEAM TO WIN THE CONTEST

*November 30, 2011*

**3rd Grade math**

What multiplication fact can be found by using the arrays of 2x9 and 5x9?

*November 29, 2011*

**Calculus**

5.60 ft and 5.60 ft

*November 20, 2011*

**science**

help im stuck!!!!!!!

*November 3, 2011*

**science**

How did Archimedias prove mathematically that salt water and diving were related to buoyancy?

*November 3, 2011*

**social studies geography**

I need help with social studies definition of social ranking

*November 1, 2011*

**math**

After flying at an altitude of 600 meters,a hot air balloon starts to descend when its ground distance from the landing pad is 10 kilomeers.What is the angle of depression for this part of the flight?

*November 1, 2011*

**science**

a 425 g cylinder of brass is heated to 90/0 degree C and placed in a calorimeter containing 334 g of water at 25.0 degree C. The water is tirred and its highest temperature is recorded as 32.0 degree C. From the thermal energy gained by the water, determine the specific heat ...

*October 28, 2011*

**science**

as 390 g of hot milk cools in a mug, it transfers 30,000 J of heat to the environment. What is the temperature change of milk? The specific heat of milk is 3.9 J/g degree C.

*October 28, 2011*

**science**

how many kilojoules of heat must be transferred to a 480 g aluminum pizza pan to raise its temperature from 22 degree c to 234 degree c? The specific heat of aluminum in this temperature range is 0.97 J/g degree C.

*October 28, 2011*

**SS**

Thanks.:D What are the 2 others? Does anyone else know?

*October 26, 2011*

**SS**

What are the 3 most visited "natural attractions" in the U.S.?

*October 26, 2011*

**Math**

wedsday

*October 26, 2011*

**SOCIAL STUDIES**

In 1900 for health reasons the course of what river was changes in the U.S. making it world's only river to flow backwards?

*October 20, 2011*

**algebra**

Dale is choosing between two exercise routines. In Routine #1, he does only running, burning 10 calories per minute. In Routine #2, he burns 10 calories walking. He then runs at a rate that burns 8 calories per minute. For what amounts of time spent running will Routine #1 ...

*October 17, 2011*

**Chemistry**

At2 26.3C, F2 molecules have a certain value of rms speed. At what temperature would the rms speed of O2 molecules be the same?

*October 16, 2011*

**social studies**

what is the landmarks of newjersey?

*October 13, 2011*

**Finance**

I have a case study to do and I'm not sure how to go about it. I need to find the present value for three different offers, all of which have a 10% rate and ordinary annuities. This is the first offer: $1,000,000 now $200,000 each year for years 6 through and including ...

*October 11, 2011*

**math**

find the average 2 1/3 3 3/4

*September 19, 2011*

**math**

find the average 5/8,2/5,1/40

*September 19, 2011*

**math**

8/25 / 1/5 *6/5

*September 19, 2011*

**Chemistry**

I have this question and I am pretty sure on what to use to solve it but I am just stuck. The reaction of 8 g of hydrogen and 28 g of carbon monoxide gave 16 g of methanol. What was the theoretical yield if the percent yield was 50%? actual yield ________________ X 100% = ...

*September 16, 2011*

**geometry**

MN and ML are oppisite rays if

*September 9, 2011*

**Math 7**

How do you plot the answer ( on a number lime) if all three answers are the same?

*September 8, 2011*

**Chem**

write the dissociation of acetic acid identifying the base,acid,H donor, and H receiver C2H4O2+H2O - H3O+C2H3O2 is hydronium the H donor and is C2H3O2 the base?

*September 6, 2011*

**Chem**

my guess is 10,000 because ph is a log scale but that seems off

*September 6, 2011*

**Chem**

How many more [H+] are there in a sol’n of pH2 than pH6?

*September 6, 2011*

**watson go to birmingham**

same

*August 25, 2011*

**watson go to birmingham**

what are the watsons like? do you thing their "weird"?

*August 25, 2011*

**MATH PLEASE HELP!!!!!**

i got 5.5

*August 25, 2011*

**History**

homo sapiens came to north america by...????

*August 24, 2011*

**physics**

. A water heater can has a power of 350 W. It is placed in a container filled with 1 litres of water with a temperature of 40 ºC. The heater is then allow to run for 1 hour. How much water will there be left in the container after 1 hour? (Specific heat capacity of water...

*August 7, 2011*

**physics**

A diver descent 100 m below sea level. If the density of sea water is 1024 kg m-3, find the pressure she will experience.

*August 7, 2011*

**math 1012**

what is the sum of the lengths 39cm and 2m

*August 4, 2011*

**Geometry**

I have a question! Can someone please answer the same question but with the numbers 35, 56, 35, 84,110

*July 24, 2011*

**Pre Calc**

Verify the following identity: sin(x)*cos(x)*(cot(x)+tan(x))=1 show work

*July 5, 2011*

**Physics**

A 0.02 kg-lead bullet traveling 200 m/s strikes an armor plate and comes to a stop. If all of it's energy is converted to heat that it absorbs, what is the temperature change?

*June 25, 2011*

**chemistry**

If 1.5 mol of each of the following compounds is completely combusted in oxygen, which one will produce the largest number of moles of H2O and why?

*June 21, 2011*

**Physics**

A 3.00-liter aluminum cylinder at 5.00°C is filled to the brim with gasoline at the same temperature. If the aluminum and gasoline are warmed to 52.0°C, how much gasoline spills out? [Hint: Be sure to account for the expansion of the container. Also, ignore the ...

*June 15, 2011*

**algebra 2**

if a3 = 20 and a6=41 for an arithmetic sequence, find a1

*June 5, 2011*

**7th math**

Simply the expression. -1 - (-3x + 2) - 7x + 8

*May 23, 2011*

**2nd Grade Math**

How do you complete a mysterious missing digit using subtraction Question example Tens. Ones 8. ____ ____. ____ -5. 7 3. ____. Answers

*May 23, 2011*

**physics**

A moving object has a kinetic energy of 133 J and a momentum with magnitude of 39.8 kg·m/s. Detemine the mass (kg), and velocity (m/s) of the object.

*May 19, 2011*

**science**

list two things green plants need to grow and thrive

*May 17, 2011*

**science**

I would like to know migration helps butterflies survive?

*May 17, 2011*

**Thermo engineering**

The driveshaft of a building’s air-handling fan is turned at 300 RPM by a belt running on a 0.3-m-diameter pulley. The net force applied by the belt on the pulley is 2000 N. determine the torque applied by the belt on the pulley, in N.m, and the power transmitted, in kW.

*May 10, 2011*

**Thermo Dynamics**

Air loses heat to the surroundings at a rate of Q.= t/6 where out Q. is in Watts and t is time in seconds. For 20 minutes of operation, determine the heat loss from the air in kWhr???

*May 10, 2011*

**Math**

Hai take 12 minutes to walk to school. He wants to get there.15 mins early to meet with his lab partner. What time shod he leave his house is school starts at 8:10 am?

*May 3, 2011*

**Algabra**

I need help solving this using U- Substitution (x^2-4)^2 + (x^2-4) -6=0

*April 27, 2011*

**Finance**

Using Monte Carlo simulation, calculate the price of a 1-year European option to give up 100 ounces of silver in exchange for 1 ounce of gold. The current prices of gold and silver are $380 and $4, respectively; the risk-free interest rate is 10% per annum; the volatility of ...

*April 25, 2011*

**Math: Statistics**

My homework has a list of numbers and I'm working with standard deviation. I know the standard deviation as well as the mean and everything, but it says to find "the weight that is 3 standard deviations below the mean." What is the formula for that, and can I do ...

*April 19, 2011*

**physic**

b) •It is done by Carbon dating. Carbon is the basic basic building block of life and has an amazing memory. Rays of the Sun which are radioactive enter our atmosphere and collide with Nitrogen atoms to create the radioactive isotope, Carbon-14. •We have both Carbon-...

*April 16, 2011*

**math**

At the end of an basketball game daniels couch told him he scored 20% of all of his teams points. If Daniel scored 19 points exactly how many points did his team score?

*April 7, 2011*

**trig**

Match each ratio in the first row with an equivalent ratio from the second row if angle A plus angle B = 90 degrees. SinA CosA TanA CscA SecA CotA SinB CosB TanB CscB SecB CotB Does this question even make sense?

*April 6, 2011*

**Calculus**

Using L'Hopital's Rule, find the limit: lim x->0+ (as x approaches 0 from the right) of sinx/x^(1/3)

*March 28, 2011*

**Fractions-easy 5th grade**

Multiply and divide. 1) -2 4/11(-2) 2) 5 1/7 / 4 1/8

*March 19, 2011*

**algebra**

y=-2,8

*March 19, 2011*

**math**

50+55=x x=105

*March 19, 2011*

**algebra**

fx^3+18fx^2+81fx+12 ____________________ 4

*March 19, 2011*

**Math**

Divide and multiply. 1) -2 4/11(-2) 2) 5 1/7 / 4 1/8

*March 19, 2011*

**Physics**

A coil is made up of 19 square loops with the sides equal to 5.3 cm. The coil is placed in a uniform 350 mT magnetic field with the axis of the coil parallel to the magnetic field. If the field reverses direction in 0.17 seconds, what is in volts, the average emf induced in ...

*March 11, 2011*

**geometry**

Quadrilateral ABCD is a rhombus with diagonals AC and BD. if angle M equals 25 find the measures of angles 2 , 3 , 4 and 5

*March 10, 2011*

**physics**

A 3.00 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 1.94 m in 1.70 s. (a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between the block and the incline. (c) ...

*March 10, 2011*

**physics**

A 3.3 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 4.2 m/s2, find the force exerted by the rope on the bucket of water

*March 10, 2011*

**Physics**

A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 104 m/s, and the radius of the orbit is 5.30 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.70 106 ...

*March 4, 2011*