Monday

September 26, 2016
Total # Posts: 215

**Biochem**

Using stocks of 0.1 M KH2PO4 and 0.1 M K2HPO4 how much 0.1 M K2HPO4 is needed to prepare 20 mL of a buffer solution at pH 7.2. The pKa of phosphate is 6.82. I know to solve for the ratio using henderson hasselbach but im lots after that! 5.2=6.82+log(A/HA) 1.0024HA=A

*September 19, 2016*

**math**

which property is illustrated by the equation 5/6(-11)=-11(5/8)

*September 9, 2016*

**Math**

15. If it's correct. Thanks for the biggest help

*August 10, 2016*

**Math**

What's the median average of mark makes 10% of 100=10, Lindsay makes 5% of 400=15, and kelly makes 15% of 100

*August 10, 2016*

**Math**

Mark makes 10% of 100, Lindsay makes 5% of 400, Kelly makes 15% of 100, what's the median average?

*August 10, 2016*

**Math**

What is the unit rate of drink 4/5 L in 1/4 hour

*May 2, 2016*

**Chemistry**

To completely react 17g of barium hydroxide, how many grams of hydrochloric acid is needed?

*April 19, 2016*

**math**

Solve the volume of a cylinder with diameter (4 +2x)m, height (5x+1)m v=pi [(4+2x) x (5x+1)]

*April 6, 2016*

**Math**

S working on answer.

*April 6, 2016*

**Math HELP**

Just plug in the 1.5 as the x value, that's what f(x) means. Whenever there is a number within the brackets, it counts as the x value.

*February 3, 2016*

**1 Science Question Unanswered**

OH! Thank you, thank you, thank you! You are truly the BEST Oscar! Thanks! ( ) (

*December 17, 2015*

**1 Science Question Unanswered**

Okay... I got all the answers. Thanks for the helps anyways. :( I just at least need one help. 1. In plants, sexual reproduction occurs when sperm and egg unite to form a... a. gamete b. gametophyte c. sporophyte d. zygote Is it a or d?

*December 17, 2015*

**Science**

Wait, hold on. 4 is b.

*December 17, 2015*

**I'M DESPERATE!!!**

Hel-lo?

*December 17, 2015*

**Science**

Hello? It's me.

*December 17, 2015*

**Science**

1. In plants, sexual reproduction occurs when sperm and egg unite to form a... a. gamete b. gametophyte c. sporophyte d. zygote Is it d? 2. A plant continues to grow throughout its life through the use of s a process called... a. alternation of generations b. photosynthesis c...

*December 17, 2015*

**Science**

1. In plants, sexual reproduction occurs when sperm and egg unite to form a... a. gamete b. gametophyte c. sporophyte d. zygote Is it d? 2. A plant continues to grow throughout its life through the use of s a process called... a. alternation of generations b. photosynthesis c...

*December 17, 2015*

**Physics**

A 1000Kg car is traveling at 40 m/s. a.) if the car stops in 20 seconds, what is the deceleration rate? b.) what friction force will stop the car in 20 seconds?

*December 1, 2015*

**Mathstatistics **

For example is this considered to be appropriate selected statistical test "(50)equal -0.45,p positive .50?

*October 27, 2015*

**Math**

The weight of a person and his luggage should not be greater than 150kg when travelling; (i) If the weight of the laggugge is W and that of a person is 70kg. write an inequality to represent this information (ii) Solf the inequality to find the range of the weight of the lagguge

*July 9, 2015*

**Chemistry**

A) -24.8kJ B)0 C) ?

*April 22, 2015*

**speech**

traditional african mariage is an advantage for men only,not women?

*April 14, 2015*

**Chemistry**

2Mg(s) + O2(g) 2MgO(s) If 9.92 g of Mg reacts with 8.52 g of O2. How many grams of MgO could be produced? I am just very confused and need an answer so that I can look back on how you got there . . .

*January 12, 2015*

**English**

Examples of letters to the person you picked (on the draw lots)

*November 29, 2014*

**physics**

a compound consist of carbon,hydrogen and oxygen only.the percentage by mass are carbon 40.0% and 6,7% hydrogen.calculate the empirical formulae

*September 25, 2014*

**Chemistry**

35.4m is not correct

*September 24, 2014*

**Chemistry**

35.4m

*September 24, 2014*

**Calculus **

The following table shows the percentage of the U.S. Discretionary Budget allocated to education in 2003, 2005, and 2009 (t=0 represents 2000) Year t 3 5 9 Percentage p(t) 6.8 7 6.2 (a) Compute and interpret the average rate of change of P(t) (b) Over the period 2003-2009 (...

*September 24, 2014*

**Mathstatistics **

I am stuck, I do not know where to start in answering or how to answer appropriate for the selected statistical test?

*August 26, 2014*

**Chemistry**

How would you write the net ionic equation for [Co (en) 2Cl2]Cl with AgNO3. Is it AgNO3 ----> Cl^- + 3Ag^+?

*April 30, 2014*

**math**

what percentage more is 2200 than 1725.

*April 29, 2014*

**Math**

|3x+1|-|2-x|<3

*April 20, 2014*

**chemistry**

The Henry's law constant for CO2 at 20°C is 3.7*10^-2 M/atm. What mass of CO2 (in grams) is present in 355 mL of soda drink if the pressure of CO2 in the can is 2.5 atmospheres at 20°C? (Assume the solubility of CO2 in the soda is the same as water)

*March 17, 2014*

**SAT prep help**

if -2x+5=2-(5-2x), what is the value of x?

*March 1, 2014*

**Chemistry**

Write the total and net ionic equations for the following molecular reaction: HgNO3 (aq) + NaCl (aq) -> HgCl (s) + 2 NaNO3 (aq)

*February 20, 2014*

**math**

Gail and 3 friends all share 1/2 a pie. All the pieces in pie put together make up 180 degrees. Gail and friends finish the pie and each eat an equal piece. They believe each piece has an angle of 25 degrees. Are they right?

*January 7, 2014*

**mental health counseling**

in multiple ways

*November 24, 2013*

**chemistry**

How many grams of I2 are present in a solution if 33.75mL of 0.140M Na2S2O3 solution is needed to titrate the I2solution?

*November 18, 2013*

**math**

A t-shirt manufacturer uses 5/8 yard of material for each shirt, how many shirts can be made fro 14 & 38 yards of material?

*October 5, 2013*

**math 15**

find the minimum height above the surface of the earth so that the pilot at point a can see an object on the horizon at c 125 miles away. assume the diameter of the earth to be 8000 miles.

*August 13, 2013*

**Math Trig Find Quadrant I II III IV**

to Fred: sinx=2sinx+1 0=2sinx+1-sinx 0=sinx+1 sinx=-1 We are going to look for the values of x. sin is < 0 meaning, the values are either in quadrant III/ IV. First, identify the rad equivalent where sin equates to -1. And that would be 270 degrees or 3pi/2 located at the ...

*June 8, 2013*

**Macroeconomics**

If the government imposes a price ceiling of $100 on a market, what would happen in the market as a result of protests of price gauging by the sellers? What would happen to the price and quantity in the market?

*May 12, 2013*

**College Algebra**

I need help in answering this problem,16 ------ . 3 39 ------ 10 to the lowest term

*January 15, 2013*

**Pre Calc 12**

Four consecutive integers have a product of 360 Find the integers by writing a plynomial equation that represents the integers and then solving algebraically.

*December 26, 2012*

**Pre Calculus**

mx3-nx2+5x-1 is divided by x-2 the remainder is -39. When divided by x-1 the remainder is 3. What are the values of m and n. Didn't know how to do the superscript for mx3

*December 26, 2012*

**chemistry**

thanks steve :)

*December 12, 2012*

**chemistry**

how many molecules are present in 1.2 mol of glucose, C6H12O6?

*December 12, 2012*

**science**

What does chlorophyll do for plants?

*November 10, 2012*

**literature**

What are the major events in Act I of A Doll's House?

*October 15, 2012*

**Algebra**

Solve using set builder notation, show all work. 12x-25 is greater than or = to 3x-5(x+6)

*July 28, 2012*

**math**

A square is made up of section A and section B. Section A is 500 sq. ft. and section B is 750 sq. ft. What percent of the square is section A? *

*July 22, 2012*

**math help**

Universal instruments found that the monthly demand for its new line of Galaxy Home Computers t months after placing the line on the market was given by D(t) = 2900 − 2300e−0.08t (t > 0) Graph this function and answer the following questions. (a) What is the ...

*July 20, 2012*

**math help**

determine the intervals where f(x) = e^((-x^2)/2) is increasing and where it is decreasing

*July 20, 2012*

**algebra**

What is the answer for 4.(5)(5)-35+21-(-3)(-3)(-3)

*July 7, 2012*

**Inverse Functions**

Given that g is the inverse function of f, and f(3)=4, and f'(3)=5, then g'(4)= ?

*June 5, 2012*

**math**

thank you for your help

*June 3, 2012*

**math**

The call letter of a radio station must have 4 letters.The first letter must be a K or a W. How many different station call letters can be made if repetitions are not allowed? *(If repetitions are allowed?)* *Important

*June 3, 2012*

**math**

The call letter of a radio station must have 4 letters.The first letter must be a K or a W. How many different station call setters can be made if repetitions are not allowed? If repetitions are allowed? I have the answers just need to know the work

*June 3, 2012*

**biology**

what all do i need to know for GCSE biology my teacher is absolutely rubbish i tried websites but i don't find them helpful thankyou

*April 15, 2012*

**Chemistry**

The formaldehyde content of a pesticide preparation was determined by weighing 0.3124g of the liquid sample into a flask containing 50.0mL of 0.0996M NaOH and 50mL of 3% H2O2. Upon heating, the following reaction took place: OH- + HCHO + H2O2 -> HCOO- + 2H2O After cooling, ...

*March 28, 2012*

**Chemistry**

A 25.00mL sample of a household cleaning solution was diluted to 250.0mL in a volumetric flask. A 50.00mL aliquot of this solution required 40.38mL of 0.2506 M HCl to reach a bromocresol green end point. Calculate the weight/volume percentage of NH3 in the sample. (Assume that...

*March 28, 2012*

**Chemistry**

What is the likely source of error from reading a graph where the absorbance (y-axis) versus concentration (x-axis) shows non-deal behaviour. The graph is going in what looks like a line of best fit but then curves off a the end. At the end of the graph there is a curve and it...

*March 27, 2012*

**Spanish-SraJMcGinthank you**

Thank you so much for explaining it-I think I got it this time.

*March 22, 2012*

**Spanish-SraJMcGin please help ?**

I'm so confused with these-please check them. ¿Estudias algo los sábados? No, no estudio nada los sábados.Do I need the no, no or just one no, estudio? ¿Hablas a francés a veces? No, no hablo nunca a francés. Once again, do I need ...

*March 22, 2012*

**Spanish-Check please! I need help**

Please check-I'm having a problem interpreting these questions and I have to answer them for homework. Could you please check my translation I'm not sure what these questions mean and I have to answer them for homework ¿Qué necesitas para comer en cereal?...

*March 21, 2012*

**Spanish-Thank you both for assisting-I really appreciate it-**

Thank you both for helping I appreciate it - I rechecked the first question-I copied it exactly as it was written so I'll just answer it as if I need a bowl, spoon, etc. Thank you again.

*March 21, 2012*

**Spanish-Help Please**

Thank you for doing that-I'm stuck on these questions

*March 21, 2012*

**Spanish-Help Please**

I'm not sure what these questions mean and I have to answer them for homework ¿Qué necesitas para comer en cereal?does this ask what I need to eat cereal-like a spoon , bowl etc? 2. ¿Qué ríes mucho cuándo miras a los payasos?Do you...

*March 21, 2012*

**Spanish-Please check answers**

Thank you for the corrections- I always forget that "a"

*March 20, 2012*

**Spanish-Please check answers**

Thanks alot-I really appreciate it Ms. Sue

*March 20, 2012*

**Spanish-Please check answers**

Él no va nunca.He never goes Él ve alguien.He sees someone. Él no ve nadie.He doesn’t see anyone.

*March 20, 2012*

**spanish**

Ellos vienen a despedirse esta noche. Daniel see esta afeitando. Patricia value a powers may contenta. Roberta see esta quitando last chaqueta. Los nines van and laver see last manos.

*February 8, 2012*

**Physics**

Consider a frictionless track as shown in the figure below. A block of mass m1 = 5.75 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 8.00 kg that is initially at rest. Calculate the maximum height to which m1 rises after the ...

*October 26, 2011*

**uncc**

the half-life of 234U, uranium-234, is 2.52 x 10^5yr. If 98.5% of thee uranium in the original sample is present, what length of time (to the nearest thousand years) has elasped

*October 25, 2011*

**Chemistry**

Calculate the pH of a 0.10 M NaHX salt solution. Ka (H2X) = 2.1 x 10-2 Ka (HX-) = 4.5 x 10-8 Can someone explain the steps to do this please?

*October 21, 2011*

**physics**

A projectile is fired straight up at a speed of 15 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 .

*October 12, 2011*

**physics**

A projectile is fired straight up at a speed of 15 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 .

*October 12, 2011*

**calculus**

find all points at which the tangent line to the graph of y=x3 is parallel to the line y=27x+5

*October 3, 2011*

**Physics**

Two objects attract each other gravitationally with a force of 2.9 10-10 N when they are 0.29 m apart. Their total mass is 4.0 kg. Find their individual masses.

*October 2, 2011*

**science**

One of the characters Mendel studied was the position of the flowers. He crossed plants that had flowers at the tips of the stems with plants that had flowers along the sides. He allowed the F1 plants, which had flowers along the sides, to self-fertilize. In the F2 generation...

*October 1, 2011*

**science**

A segment of double-stranded DNA contains 31% Adenine (A) bases. a. What are the percentages of the other three bases in the DNA segment? (Count bases on both strands.) C: T: G:

*September 28, 2011*

**science**

There are about 300,000,000 US citizens. If we wanted to assign each person a unique identifier, using DNA sequences, how long a DNA sequence would we need? (Here’s another way of phrasing the question: How many bases of DNA are required for there to be at least 300 ...

*September 28, 2011*

**Math**

The measure of one angle in a linear pair is 30 more than twice the measure of the other angle. Find the measure of the angles. (I really need help! Thanks)

*September 19, 2011*

**chemistry**

A glass apparatus contains 26.223 g of water when filled at 25 °C. At this temperature, water has a density of 0.99704 g/mL. What is the volume of this apparatus?

*September 12, 2011*

**chemistry**

A glass apparatus contains 26.223 g of water when filled at 25 °C. At this temperature, water has a density of 0.99704 g/mL. What is the volume of this apparatus?

*September 12, 2011*

**chemersty**

Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter your answer with the correct number of significant figures. 885.75 g + 10.151 g - 25.50 g

*September 10, 2011*

**Maths**

Stuck! Help! 2.5 cubed? Xxxxx

*August 22, 2011*

**math**

in a distribution of 160 values with a mean of 72,at least 120 fall within the interval 67-77. approximately what percentage of values should fall in the interval 62-82? use chebyshev's formula.

*June 28, 2011*

**Math**

17 cents per piece

*April 13, 2011*

**science**

please help!

*March 19, 2011*

**science**

lena carried out an investigation to find the energy content in bacon rind she lit the bacon rind with a bunsen burner and held it beneath a test tube of water she stirred the water and recorded it temperature! why did lena stir before recording the temperature?

*March 19, 2011*

**science**

does noone know

*March 18, 2011*

**science**

please help

*March 18, 2011*

**science**

urgent

*March 18, 2011*

**science**

the list below shows three ways in which metals can react. a) strongly heat the metal in the air. b)add small pieces of the metal to cold water. c)add small pieces of the metal to dilute acid. in each case choose a b or c calcium oxide hydrogen (using zinc) magnesium chloride ...

*March 18, 2011*

**Physics**

My teacher didn't specify if 9.821 m/s^2 is the value of the North Pole. We don't have class this week because of Spring Break and it's due the morning we get back, so I can't ask him any questions. But I got C through F now, thank you!

*March 4, 2011*

**Physics**

Consider a pendulum of length 4.557 m. The acceleration of gravity is 9.832 m/s2 . a) What is its period at the North Pole? Answer in units of s. b) What is its frequency? Answer in units of Hz. c) What is its period in Chicago, where g = 9.803 m/s2? Answer in units of s. d) ...

*March 4, 2011*

**Physics**

A trapeze artist swings in simple harmonic motion with a period of 3.2 s. The acceleration of gravity is 9.81 m/s2 . Calculate the length of the cables supporting the trapeze. Answer in units of m.

*March 4, 2011*

**Physics**

A mass of 0.38 kg is attached to a spring and is set into vibration with a period of 0.22 s. What is the spring constant of the spring?

*March 4, 2011*

**math (calculus)**

A cap of a sphere is generated by rotating the region about the y-axis. Determine the volume of this cap when the radius of the sphere is 5 inches and the height of the cap is 1 inch.

*February 13, 2011*