# Posts by David

Total # Posts: 2,261

**Chemistry**

Determine whether a solid forms when solutions containing the following salts are mixed. (Express your answer as a chemical equation. Identify all of the phases in your answer) NaF and AgNo3 MnSO4 and Na2CO3

**EDU**

Need this answered in a few good sentences

**6th Grade Social Studies**

What factors affect the enviroment?

**Physics**

A scaffold of mass 60 kg and length 5.0 m is supported in a horizontal position by a vertical cable at each end.A painter of mass 80 kg stands at a point 1.5 m from one end. (a)Find the tension in the cable nearer to the painter. (b)Calculate the tension in the second cable

**Statistics**

#1- The normal distribution had a mean of 14 and standard deviation of 4. There were 30 people in the study group and the average was expected to be 16. The study was tested at the .05 level of significance. What was the power of the study? 74.2% 80.5% 86.4% 92.7% #2- If a ...

**Chemistry**

2.24M

**Math**

I've been staring at this problem for an hour and have NO IDEA WHAT TO DO! "A quadratic function in the form f(x)=ax^2+bx+c contains the points (-1,0), (0,2), and (2,0)." a) determine the values of a,b, and, c b) Factorise the expression ax^2+bx+c obtained from ...

**french**

le samedi, je joue ou tennis avec mon per'e

**Medical coding Insurance Math**

20$,$ 30.80

**Chemistry**

250mL x 1L/1000mL x 2.50mol Al(OH)3/1L x 3 mol H2SO4/2 mol Al(OH)3 x 1L/18.0 mol H2SO4 x 1000mL/1L = 52.1mL H2SO4

**Macroeconomics**

Say you have a 15% inflation rate and a 10% unemployment rate, and inflation is "public enemy number 1", what fiscal and monetary policies could you use to defeat inlfation?

**algebra**

t=1.8125

**math**

78*43+1=3355

**Chemistry**

An aqueous solution of a compound with a very high molar mass was prepared in a concentration of 82.7 g·L-1 at 25 °C. Its osmotic pressure was 0.540 ·102 Pa. Calculate the molar mass of the compound. Cheers

**6th grade math**

2 ---- t = 9 5

**Math**

At the National Zoo, 12 out of 25 exhibits contain a mammal. Assuming that there are 375 exhibits, how many many are mammals? A) 11 B) 32 C) 132 D) 300 Here is what I am doing: 12/25 = x/375 375 * (12/25) = (x/375) * 375 180 = x But 180 isn't an option

**6th Grade Science**

How do meteorologists forecast weather?

**6th Grade Grammar**

Also, is got a verb?

**6th Grade Grammar**

What is the positive adverb form? ______ , more , most and ______ , less , least

**6th Grade Math**

Thank you!

**6th Grade Math**

This is fractions. Not dividing problems. (Ex: 3/5 is a fraction) 5c = 2/3 (divided by) 2/3

**Physics**

You swing one yo-yo around your head in a horizontal circle. Then you swing another yo-yo with twice the mass of the first one, but you don't change the length of the string or the period. How do the tensions in the strings differ?

**Finance**

Adams Enterprises’ noncallable bonds currently sell for $1,120. They have a 15- year maturity, an annual coupon of $85, and a par value of $1,000. What is their yield to maturity?

**6th grade math HELP**

I need help with definding classify

**MATH**

A set of numbers has “the triple-sum property” (or TSP) if there exist three numbers in the set whose sum is also in the set. [Repetitions are allowed.] For example, the set U = {2, 3, 7} has TSP since 2 + 2 + 3 = 7, while V = {2, 3, 10} fails to have TSP. (a) ...

**social studies**

life, liberty and the pursuit of happiness.

**chemistry**

Trimellitic acid containing carbon, hydrogen, and oxygen has 51.44% C, 2.88% H, and 45.68% O. It can be obtained by oxidation of coal with nitric acid. A 2.416-g sample of this compound was dissolved in 40.00 g of acetone, producing a solution that boils at 56.64°C. Kb for...

**6th grade**

how do I get the answer to: 4/5 pounds of mints for 10 students?

**geometry**

I have no clue

**Biology - Hormones**

estrogen is one

**Chemistry**

The Solvay process for the manufacture of sodium carbonate begins by passing ammonia and carbon dioxide through a solution of sodium chloride to make sodium bicarbonate and ammonium chloride. The equation for this reaction is H2O + NaCl + NH3 + CO2 → NH4Cl + NaHCO3. In ...

**Chemistry**

please help me out, thanks

**Chemistry**

Is that correct?

**Chemistry**

Barium sulfate, BaSO4 is made by the following reaction. Ba(NO3)2(aq) + Na2SO4(aq)----> BaSO4(s) + 2NaNO3(aq) An experiment was begun with 91.77 g of Ba(NO3)2 and an excess of Na2SO4. After collecting and drying the product, 62.3 g of BaSO4 was obtained. Calculate the ...

**Chemistry**

The Solvay process for the manufacture of sodium carbonate begins by passing ammonia and carbon dioxide through a solution of sodium chloride to make sodium bicarbonate and ammonium chloride. The equation for this reaction is H2O + NaCl + NH3 + CO2 ¨ NH4Cl + NaHCO3. ...

**MATH**

Let’s agree to say that a positive integer is prime-like if it is not divisible by 2, 3, or 5. How many prime-like positive integers are there less than 100? less than 1000? A positive integer is very prime-like if it is not divisible by any prime less than 15. How many ...

**math**

4. For the curve with y = -2x3 + x - 6, find: (b.) the gradient at the point (-1, -5) (c.) the equation of the tangent line at the point (-1, -5).

**Math**

Find the value(s) of x, so that f’(x) = 0 for the function f(x) = 4x3 – 6x2 – 24x.

**Physics**

(9.0e^9)(1)(1)/(1)^2 = 9.0e^9 (9.0e^9)(1/4)(1) = 2.25e^9 2.25e^9/(1/2)^2 = 9.0e^9 1/2*d

**chemistry**

One gram of TNT, C7H5N3O6, has 1.33 ´ 1022 hydrogen atoms. How many carbon atoms are there in 1.00 g of TNT?

**calculus**

(6+2y)/(3*sqrt(9-y^2)) = Ae^(kt) How do you show the steps to figure what y equals?

**calculus**

(6+2y)/(3*sqrt(9-y^2)) = Ae^(kt) How do you show the steps to figure what y equals?

**economic**

3. Consumer spending on durables falls, draw a graph to analyze the effects of this change in real interset. 4. The Canadian demand for Mexican Pesos is downward sloping and supply of pesos is upward sloping. Assume a system of flexible exchange rate between Mexico and Canada...

**Physics**

53

**Chemestry**

the solubility of a gas is 0.34g/L at STP. What is it's solubility at a pressure of 0.80 atm and the same temperature?

**Chemistry**

i don't no

**Math**

Carrie and Crystal live at a equal distances from school. Carries walks to school at an average rate of 3 miles per hour and Crystal rides her bike at an avergae rate of 9 miles per hour. It takes Carrie 20 minutes longer than Crystal to get to school. How far do Crystal and ...

**History**

This should actually be historian Richard Pipes

**History**

Why is historian Orlando Figes so against Lenin's actions - especially in the February and October revolutions

**6th Grade Grammar**

Thank you.

**6th Grade Grammar**

The sixth grade class *had wrote* several papers about the great sphinx. How should the words in the asterisks be written? A. had written b. has wrote c. correct as is

**6th Grade Grammar**

Thank you.

**6th Grade Grammar**

Present perfect, past perfect or future perfect. This month, we have learned about the great sphinx.

**6th Grade Grammar**

Present perfect or past perfect. The two have worked together to write a book.

**6th Grade Grammar**

Past perfect or present perfect. Raj has told the reporter about his new ideas.

**6th Grade Grammar**

Past perfect or present perfect. A reporter has interviewed him several times.

**English**

Its a letter to the editor we are analysing.

**English**

Language Analysis Please help me find persuasive techniques/statements in the following article.. I've never done this before, and I've "stewed" over the subject for the last couple of days, but I'm absolutely incensed that the Victorian Government will ...

**math**

how would you factorise a) 9x^2 - 49 b) 9x^2 - 121 c) 49x^2 - 25x^2 thankyou

**Science 6th Grade**

When the frequency of a note is twice the frequency of another, the notes are a(n) ______________ apart.

**Science 6th Grade**

Light, XRays, and radio waves contain _____________ with different amounts of energy.

**computers**

i need this decrypted if anyone can help that would be great 1b4a045c34a0573ca57657a1021dc171

**chemistry**

Most natural gas consists of about 90% methane, CH4. Assume that the solubility of natural gas at 20 C and 1 atm gas pressure is about the same as that of CH4, 0.02 g/kg water. If a sample of natural gas under a pressure of 20 atm is kept in contact with 1.00 *10^3 kg of water...

**math**

Nature's best wants to combine nuts they sell for $3.60 a pound with dried fruit they sell for $2.40 a pound to create a trail mix. How much of each snack should they use to make 10 pounds of trail mix that would sell for $3.30 a pound? Thank you!

**Computer**

OMG totally didn't see that, thank you!

**Computer**

This problem is a base conversion problem masquerading as a "word problem". You are responsible for controlling the stage lights at a small theater. The control box has control switches for 10 separate lights, and each switch can make its corresponding light off, red...

**Chemistry-Equation**

1.67 mol in a balanced equation there 6 mol of oxygen for every 1 mol of glucose; so ratio is 6 to 1. 10 mol oxygen/ 6 = 1.67...

**math**

I just have to tell if the are equal or equivalent or both, or neither. I think the answer is both but not sure

**math**

L,M,N,O and l,m,n,o are they equal, equivalent or neither? I can not figure this out please help.

**geometry**

When the number w is multiplied by 4, the result is the same as when 4 is added to w. What is the value of 3w

**geometry**

If p is an interger and 3 is the remainder when 2p+7 is divided by , then p could be what?

**physics**

1.8*10^4

**Math**

A farmer has a dog, two geese and three bags of corn. He comes to a river. The boat to ferry him across the river can only hold the man plus two of his six possessions at a time. The farmer knows that if he is not right there the dog will eat a goose or a goose will eat the ...

**math**

(3n^4)^4 = 3d^3 x d^9 = 5e^4 x 6e^5 = thanks

**Literature**

In "A Pair of Silk Stockings," are a symbol of

**11th grade**

Factor f(x) = x^4 + x^3 – 8x^2 + 6x + 36 completely. Show all steps.

**chemistry**

When the glucose solution described in part A is connected to an unknown solution via a semipermeable membrane, the unknown solution level rises. Based on this information, what can be said about these two solutions? a.) The unknown solution had the lower concentration. b.)The...

**chemistry**

When the glucose solution described in part A is connected to an unknown solution via a semipermeable membrane, the unknown solution level rises. Based on this information, what can be said about these two solutions? a.) The unknown solution had the lower concentration. b.)The...

**chemistry**

nevermind i got it

**chemistry**

In the reaction A to products, A is found to be 0.489 M at t=72.0 s and 0.468 M at t=82.2 s What is the average rate of the reaction during this time interval? Do I take the Ln (0.468/0.489) = -0.04395 / 10.2 = 4.3 * 10^3. yet the comp says its wrong. i have to put it to two ...

**chemistry**

A 355g sample of a saturated solution of KNO3(s) in water is prepared at 25.0 degrees C. If 50g H2O is evaporated from the solution at the same time as the temperature is reduced from 25.0 to 0.0 degrees C, what mass of KNO3(s) will recrystallize? i have no idea where to start...

**chemistry**

Nope he has not responded

**chemistry**

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have possibly been made. (Putting...

**chemistry**

so would the answer be 4.8 * 10 ^ -2?? if its fewer?

**chemistry**

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have possibly been made

**chemistry**

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have possibly been made

**Statistics**

How do you know the p-value on megastat. On minitab It looks like it gets a different p-value than megastat. I got a number from megastat of 2.35E10 and on minitab it was 0.000.

**math**

Without finding the exact answer, select which of the following numbers is the best estimate of each sum or difference and justify your choices: -2/3, 0, 2/2/3. a. 1/9 + 2/5 – 1/3 – 3/4 I am confused on where to begin on this question.

**chemistry**

How many milliliters of glycerol, C3H8O3(d=1.26g/mL), must be added per kilogram of water to produce a solution with 4.85 mol % C3H8O3? Kinda lost -.-;

**chemistry**

If a hydrate of the formula decomposes when heated to produce HCl, what change would you expect to occur when a piece of blue litmus paper is held in the path of the vapor released? [Litmus paper is paper impregnated with an acid-base indicator that is blue in the presence of ...

**chemistry**

sorry would i multiply the moles of O2 by the 1(0.208) to get the concentration which is proportional to the molarity?

**chemistry**

Okay, so this is how I think I should set it up? can you confirm it at least. Anyways I would try to find moles of O2 using ideal gas law (1.00 atm)(0.283)/(0.0821)(298) = n moles O2. then I would multiply 0.208 by the 1 L of water?? Then divide the moles of O2 / by L of water...

**chemistry**

Under an O2 pressure of 1.00 atm, 28.31 mL of O2 dissolves in 1.00 L H2O at 25 degrees. Determine the molarity of O2 in an aqueous solution at equilibrium with air at normal atmospheric pressure. The volume percent of O2 in air is 20.80 \%. (Have no idea how to go through with...

**chemistry**

oh. that's the complete opposite of what i thought. thanks

**chemistry**

An ideal liquid solution has two volatile components. In the vapor in equilibrium with the solution, the mole fractions of the components are (a) both 0.50; (b) equal, but not necessarily 0.50; (c) not very likely to be equal; (d) 1.00 for the solvent and 0.00 for the solute. ...

**chemistry**

Under an O2 pressure of 1.00 atm, 28.31 mL of O2 dissolves in 1.00 L H2O at 25 degrees. Determine the molarity of O2 in an aqueous solution at equilibrium with air at normal atmospheric pressure. The volume percent of O2 in air is 20.80 \%. (Have no idea how to go through with...

**chemistry**

nope. have to contact my teacher about this.

**chemistry**

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH? Ok...I got 480, and the systems says there's a rounding error. I did it again and I got 480. Someone help me?

**biology 102**

I've already done it, thank you. Was wondering if there were any other predictions.

**biology 102**

A prediction (educated guesses as to what the potential results may be) for each experiment listed below: 1) knee-jerk reflex 2) pupillary reflex (shield left eye, shine bright light into right eye, observe pupils) 3) 2-point threshold 4) temperature discrimination 5) ...