Saturday

April 18, 2015

April 18, 2015

Total # Posts: 2,939

**Math**

List all potential rational zeros of 9x^3+6x^2-29x-10
*April 30, 2013*

**chemistry**

Al2(SO4)3+6KOH-->2Al(OH)3+3K2SO4 a)How many grams of potassium hydroxide are needed to completely react with 870 mg of aluminum sulfate? b)If you want to make 7.00 grams of potassium sulfate, how many grams of aluminum sulfate would you need to react? c)How many grams of ...
*April 29, 2013*

**Math**

A multiple choice quiz contains five question. Each question has four answer choices. Michael is not prepared for the quiz and decides to guess for each question. What is the probability that Michael will get at least one question correct? What is the probability that Micheal ...
*April 29, 2013*

**Eng B**

B - Weaves exciting action around a standard formula C - Contains or suggests universal truths refers to today's hot topics
*April 29, 2013*

**english.**

4. b
*April 28, 2013*

**english.**

3. d
*April 28, 2013*

**english.**

Is one C?
*April 28, 2013*

**english.**

1 D. 2 D. 3 C. 4 c.
*April 28, 2013*

**english. **

1. Read the following stanza from “Alone”: Lying, thinking Last night How to find my soul a home Where water is not thirsty And bread loaf is not stone I came up with one thing And I don’t believe I’m wrong That nobody, But nobody Can make it out here alone...
*April 28, 2013*

**Herndon High**

cos15°cos30°- sin15°sin30° =
*April 27, 2013*

**Algebra**

{5x-4y=-21} {-2x+4y=18}
*April 25, 2013*

**Math **

I can't remember how to do simplifying algebraic expressions can anyone help me?
*April 25, 2013*

**chemisrty**

A 21.00 sample of 0.3254M Hcl solution requires 26.09 ml of NaOH solution for complete neutralization. Calculate the volume of NaOH solution in liters, required for the titration.
*April 25, 2013*

**physics**

800+x-1300-400=0 800+x-1700=0 x=900
*April 21, 2013*

**Algebra**

Given the following piecewise function f(x)= {-x+1 for x < 0 {-1 for 0 ≤ x ≤ 3 {-2x for x > 3 a) Find the domain b) Find the range c) Find the intercepts d) Is f continuous on its domain? If not, state where f is discontinuous. e) Graph the function
*April 19, 2013*

**Chemistry**

Write the balanced chemical equation for reaction the following chemical reaction ozone gas , O3 , reacts with 2,3,4,5-tetramethylheptane, CH3-CH(CH3)-CH(CH3)-CH(CH3)-CH(CH3)-CH2-CH3 , to produce carbon dioxide gas, CO2 , and water vapor, H2O
*April 18, 2013*

**probability**

A company manufactured 1, 000 televisions. Testing showed that 20 of the televisons were defective. What is the experimental probability that the next television will be defective?
*April 18, 2013*

**Chemistry**

What is the equation for the reaction of potassium soap with HCL?
*April 18, 2013*

**Chemistry**

In saponification, does sudsing show after adding acid. Why?
*April 18, 2013*

**Got it right **

:0
*April 17, 2013*

**Calculus**

Find two positive numbers whose sum is 8 such hat when the cube of th first number is multiplied by the second number, the result is maximum.
*April 16, 2013*

**Chemistry**

Give the equation for the base hydrolysis of methyl benzoate by KOH. What are the 2 types of molecules being formed in this reaction?
*April 15, 2013*

**Chemistry**

If the molecule triglyceride underwent base hydrolysis, what 4 products would you obtain? Give the condensed formulas.
*April 15, 2013*

**Trig**

Solve the multiple-angle equation. (Enter your answers as a comma-separated list. Let n be any integer. Enter your response in radians.) sec 9x = 2
*April 15, 2013*

**Chemistry**

A balloon contains 2000mL of helium gas at 300K what is the new volume in mL at 600K
*April 15, 2013*

**Math**

Ok, thank you.
*April 15, 2013*

**Math**

x^2(3-x)=k. That's the equation.
*April 15, 2013*

**Math**

Given that the equation x^2(3-x) has 3 real solutions of k, give the set of possible values for k.
*April 15, 2013*

**anthropology**

Chiefdoms are characterized by all of the following except
*April 14, 2013*

**Chemistry**

How many grams of NaF should be added to 612 ml of 0.4 M HF (Ka = 6.8 x 10-4) to produce a buffer solution where pH = 3.10?
*April 12, 2013*

**problem solving**

ou are completing the final exam in your class. Your instructor’s assignment instructions state that you may only use the following resources: library books, class notes, texts, and the instructor. You and your roommate discussed one of the questions, but you wrote your ...
*April 12, 2013*

**Chemistry **

How much energy would be released when 675 grams of steam is condensed to water
*April 11, 2013*

**place vowlue**

2 tens and333 hundreds
*April 10, 2013*

**Math**

3+3+4+4=14 feet for each window,3 feet wide and 4 feet high.You have 5 windows so what is 5x14?
*April 9, 2013*

**Algebra**

Given f(x)=-4+lnx; Find the inverse of f. f^-1=?
*April 7, 2013*

**Math**

a curve is such that dy/dx=4x+7. the line y=2x meets the curve at point 'P'. Given that the gradient of the curve at P is 5. State the coordinates of P.
*April 7, 2013*

**math**

ONE-NINTH
*April 7, 2013*

**math**

1rad=180/pi degrees. so 174=f degrees. cross multiply and get f=174 x 180/pi. where f represents the unknown degrees.
*April 7, 2013*

**MATH**

Complete the square method.
*April 7, 2013*

**MATH**

ok, divide throughout by logv3 and then you will get a quadratic equation and solve for t.
*April 7, 2013*

**MATH**

remember to divide the terms when subtracting in logarithms.
*April 7, 2013*

**science asap**

altitude on the horizontal axis and pressure on vertical because the independent variable always goes on the horizontal axis, and in this case pressure changes depending on the altitude.
*April 7, 2013*

**math**

What does a lower perfect square and a upper perfect square mean.
*April 7, 2013*

**Math**

a curve is such that dy/dx=4x+7. the line y=2x meets the curve at point 'P'. Given that the gradient of the curve at P is 5. State the coordinates of P.
*April 7, 2013*

**Pre-Algebra**

6,7,8
*April 7, 2013*

**Math**

Yeah it's 1. 22-12-9=1
*April 7, 2013*

**Math**

No it is not.
*April 7, 2013*

**math**

Write the slope Intercept form of the depletion of the line that contains -4,6 and 6,-1
*April 6, 2013*

**Philosphy**

what is the role of the agent intellect? I know it illuminates and then abstracts the phantasm, but not really understanding completely..thank you
*April 6, 2013*

**geometry**

LMNO is a parallelogram. If NM = x + 15 and OL = 3x + 5, find the value of x, then find NM and OL
*April 5, 2013*

**Analytical chemistry**

A 25.0-mL solution of 0.0660 M EDTA was added to a 33.0-mL sample containing an unknown concentration of V3 . All V3 present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a 0.0450 M Ga3 solution until all the EDTA reacted, requiring 13...
*April 4, 2013*

**Analytical chemistry**

Calculate pCd2 at each of the following points in the titration of 40.00 mL of 0.0040 M Cd2 with 0.0040 M EDTA in the presence of the auxiliary complexing agent NH3. The solution is buffered at a pH of 11.00. Take the NH3 concentration to be a constant 0.100 M. The formation ...
*April 4, 2013*

**chemistry**

A 50.00-mL sample of groundwater is titrated with 0.0900 M EDTA. Assume that Ca2 accounts for all of the hardness in the groundwater. If 11.40 mL of EDTA is required to titrate the 50.00-mL sample, what is the hardness of the groundwater in molarity and in parts per million of...
*April 4, 2013*

**chemistry**

The concentration of saturated NaOH is 50.0% w/w and the density is 1.52 g/mL. If exactly 8.50 mL were diluted to 1.000 L, what would be the concentration?
*April 4, 2013*

**chemistry**

A solution of the primary standard potassium hydrogen phthalate, KHC8H4O4, was prepared by dissolving 0.4877 g of potassium hydrogen phthalate in about 50 mL of water. Titration with a KOH solution required 17.65 mL to reach a phenolphthalein end point. What is the molarity of...
*April 4, 2013*

**Analytical chemistry**

A 24.393 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 80.601 g of water. A 12.404 g aliquot of this solution is then titrated with 0.1059 M HCl. It required 31.61 mL of the HCl solution to reach the methyl red ...
*April 4, 2013*

**chemistry**

The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.4. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.75 M B(aq) with 0.75 M HCl(aq). (b) after addition of 25.0 mL of HCl (c) after addition of 50.0 mL of HCl (d) after addition...
*April 4, 2013*

**chemistry**

0.650 L of 0.420 M H2SO4 is mixed with 0.600 L of 0.280 M KOH. What concentration of sulfuric acid remains after neutralization?
*April 4, 2013*

**Chemistry**

Of the 3 types of fat, which type of fat would react with the greatest amount of bromine? Least amount of bromine? a. saturated fat b. mono-unsaturated fat c. poly-unsaturated fat
*April 2, 2013*

**physics**

block 1 has mass m1 = 480 g, block 2 has mass m2 = 540 g, and the pulley is on a frictionless horizontal axle and has radius R = 5.2 cm. When released from rest, block 2 falls 76 cm in 5.2 s (without the cord slipping on the pulley). What is the pulley's rotational inertia...
*April 2, 2013*

**physics**

The average rate at which energy is conducted outward through the ground surface in a certain region is 66.8 mW/m2, and the average thermal conductivity of the near-surface rocks is 2.13 W/m·K. Assuming a surface temperature of 8.01°C, find the temperature (in ...
*April 1, 2013*

**physics**

In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that ...
*April 1, 2013*

**Statistics**

A) 0.153 B) 0.753 C) 0.095
*March 30, 2013*

**Philosophy**

Show that (P → Q) ↔ (¬P ∨ Q) in fitch
*March 29, 2013*

**Math**

thanks
*March 28, 2013*

**Math**

What is 9/20 in simplest form?
*March 28, 2013*

**french**

I need to complete activity 11 noms et prenoms with the verb appeler, it's French 3 in the la routine quotidienne packet?
*March 27, 2013*

**Chemistry 140A**

A gas cylinder containing 6.38 mol of neon has a pressure of 491 mm Hg at 295 K. If 3.22 mol of helium is added to this cylinder, at constant temperature and volume, what will be the pressure in the cylinder?
*March 26, 2013*

**Form a polynomial f(x)**

Form a polynomial f(x) with the real coefficients having the given degree and zeros. Degree 5; Zeros: -3; -i; -6+i f(x)=a( )
*March 26, 2013*

**College algebra**

Form a polynomial f(x) with the real coefficients having the given degree and zeros. Degree 5; Zeros: -3; -i; -6+i f(x)=a( )
*March 26, 2013*

**Find the complex zeros**

Find the complex zeros of the polynomial function. Write f in the factored form. f(x)=x^3-3x^2+7x-5 f(x)=
*March 26, 2013*

**Use the intermediate value**

Use the intermediate value theorem to show that the polynomial function has a zero in the given interval. f(x)=4x^3+6x^2-7x+1; [-4,-2] f(-4)=
*March 26, 2013*

**math **

I need help with these two problems please. Completely factor the polynomial. 8x^3+16^2+8x+16 Factor the trinomial completely. y^3-14y^2+48y
*March 24, 2013*

**Science**

Which would you measure in millimeters , a capacity of a juice box or the capacity of a water pitcher?
*March 23, 2013*

**quantitative chemistry**

Na2HAsO4 neutral compound
*March 22, 2013*

**Chemistry**

At 122C the pressure of a sample of nitrogen gas is 0.830 atm. what will the temperature in Celsius be at 3.00 atm, assuming constant volume ?
*March 20, 2013*

**Biology**

What was a event in Darwins life that lead him to the theory of evolution. When i googled it those were the only two that came up. And our teacher told us to not to do those
*March 20, 2013*

**Biology**

What was a event in Darwins life that lead him to the theory of evolution. When i googled it those were the only two that came up. And our teacher told us to not to do those
*March 20, 2013*

**Biology**

Research and discuss an event in Charles Darwins' life that lead to his theory of evolution. Events could be directly in Charles Darwin's life or could be individuals whose ideas Darwin incorporated into his work. Besides the voyage to Beagle and the visit to the ...
*March 20, 2013*

**Chemistry**

In an experiment with a titration of Vitamin C with Iodine, why must the iodine dropper be standardized?
*March 19, 2013*

**Chemistry**

A student completed the standardization procedure & found that the value for her dropper was 0.133 mg Vitamin C/dp l2. The student then selected a juice & titrated it with the iodine from the dropper bottle. The sample turned blue with the addition of the 19th drop. How many ...
*March 19, 2013*

**Chemistry**

During the standardization procedure of the iodine dropper, a student used 10.0 mL of a 1.00 mg.mL standard of Vitamin C. After adding 41 drops of iodine to the 10.0 mL of the standard, the sample was a deep blue. Calculate how many mg of Vitamin C are titrated by each drop of...
*March 19, 2013*

**Physics**

Somehow, I got the right magnitude, but my x and y are different. my x=-21.35 and y=13.9 how?
*March 18, 2013*

**Physics**

A charge of -3.66C is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.0978 m). The charges on the circle are -4.04C at the position due north and +6.20C at the position due east. What is (a) the magnitude and (b) ...
*March 18, 2013*

**word puzzle**

italian
*March 18, 2013*

**geography**

thank you Ms. Sue, i appreciate it :)
*March 18, 2013*

**geography**

landlocked and high elevation?
*March 18, 2013*

**geography**

THANK YOU bolivia-is it because of their high indig. population and poverty? col-coca leaf? central Colombia brzil-#1 producer in oranges, soybean, sugarcane, and coffee. Most common resources include iron ore, aluminum, and gold has complete access to Atlantic ocean\ brasilia...
*March 18, 2013*

**geography**

1. Bolivia is pretty isolated--why? 2. Columbia has an important resource--what is it, where is it? 3. Brazil has many resources--where are they? Access? 4. Why is Brazilia a forward capital? 5. What is Cuba's access? Why does the US have a trade embargo against? What ...
*March 18, 2013*

**geomerty**

the hexagon GIKMPR and triangle FJN are regular the dashed line segments form 30 degree angles
*March 17, 2013*

**Physics**

A 5.81 10-5 H solenoid is constructed by wrapping 62 turns of wire around a cylinder with a cross-sectional area of 8.20 10-4 m2 When the solenoid is shortened by squeezing the turns closer together, the inductance increases to 8.94 10-5 H. Determine the change in the length ...
*March 17, 2013*

**Physics**

The coil of a generator has a radius of 0.12 m. When this coil is unwound, the wire from which it is made has a length of 5.8 m. The magnetic field of the generator is 0.21 T, and the coil rotates at an angular speed of 26 rad/s. What is the peak emf of this generator? Answer ...
*March 17, 2013*

**Physics**

The coil of a generator has a radius of 0.12 m. When this coil is unwound, the wire from which it is made has a length of 5.8 m. The magnetic field of the generator is 0.21 T, and the coil rotates at an angular speed of 26 rad/s. What is the peak emf of this generator? Answer ...
*March 17, 2013*

**Math - Grade 5**

A shop sells candies by weight. Monisha bought 2 full bags of chocolates and 3 full bags of gummy bears for $23.50. If 3/4 of a bag of chocolate cost as much as 5/6 of a bag of gummy bears, find the cost of 1 full bag of chocolates.
*March 16, 2013*

**Math - Grade 5**

After saving 4/5 of his salary every month, Zacky has $150 left. Micah saves 6/7 of his salary every month. If both guys save an equal amount each month, how much is their combine salary?
*March 16, 2013*

**artist**

Is it possible for a band or artist to make topical or political commentary in a song today while focusing on turning a profit?
*March 14, 2013*

**chemistry**

I need 1L of a pH 4 buffer with a total molarity of 1. Propose a buffer system and a recipe to achieve this goal. (acetic acid/acetate would probably be a good choice.) help please!
*March 12, 2013*

**chemistry**

I need 1L of a pH 4 buffer with a total molarity of 1. Propose a buffer system and a recipe to achieve this goal. (acetic acid/acetate would probably be a good choice.) help please!
*March 12, 2013*

**chemistry**

1L of a buffer composed of acetic acid and sodium acetate has a pH of 4.3 (total molarity=0.0774) what is the capacity of 200mL of the buffer to survive an addition of HCl without changing by more than 0.4 pH units? i am so lost please help! i know you use the henderson ...
*March 12, 2013*

**chemistry**

I need 1L of a pH 4 buffer with a total molarity of 1. Propose a buffer system and a recipe to achieve this goal. (acetic acid/acetate would probably be a good choice.) help please!
*March 12, 2013*