Friday

February 12, 2016
Total # Posts: 904

**Chemistry**

Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.
*September 28, 2011*

**Please help!**

Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.
*September 28, 2011*

**Help please:-)**

What is the most important key to an effective essay?
*September 28, 2011*

**Chemistry**

Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.
*September 28, 2011*

**Algebra 1 Scientific Notation**

1.462828271x10^99
*September 26, 2011*

**math**

the sum of the lenths of any two sides of a triangle must be greater than the third side. if a triangle has one side that is 17 cm and a second side that is 4cm less than twice the third side, what are the possible lenths for the second and third side?
*September 26, 2011*

**Algebra**

A runner wants to run 11.6 km. She knows that her running pace is 8.1 miles per hour. How many minutes must she run?
*September 22, 2011*

**geometry**

A.
*September 22, 2011*

**Chemistry**

For the following acid-base reaction, calculate the mass (in grams) of each acid necessary to completely react with and neutralize 5.00 g of the base. HCl(aq)+ NaOH(aq)->H20(l)+NaCl(aq) Please explain how to do this.
*September 16, 2011*

**social studies**

why might the earliest farming communities have developed along the Nile,Tigris,and Euphrates
*September 15, 2011*

**social studies**

how did rivres in southwest asia enrich the soil
*September 15, 2011*

**math**

the cube of what number is 2197?
*September 14, 2011*

**physics**

A baseball player hits the ball at a speed of 20.1 m/s and an angle of 30 degrees. What is the baseball's horizontal velocity? What is the baseball's vertical velocity? How long does it take the baseball to get 28m in front of home plate?
*September 11, 2011*

**physics**

ummmmmmmmmmmm who the heck are you??? im asking a simple physics question if you have a problem then you can take it somewhere else darling:)
*September 11, 2011*

**physics**

A baseball player hits the ball at a speed of 20.1 m/s and an angle of 30 degrees. What is the baseball's horizontal velocity? 1m/s What is the baseball's vertical velocity? 2m/s How long does it take the baseball to get 28m in front of home plate? 3 seconds
*September 11, 2011*

**7th grade social studies**

how did rivers enrich the soil
*September 7, 2011*

**Chemistry**

Boron has only two naturally occurring isotopes. The mass of boron-10 is 10.01294 amu and the mass of boron-11 is 11.00931 amu. Use the atomic mass of boron to calculate the relative abundance of boron-10. Atomic mass of boron is 10.81 How do I solve this?
*September 7, 2011*

**Chemistry**

Thank you!
*September 7, 2011*

**Chemistry**

An alpha particle,4He2+ , has a mass of 4.00151 . Find the value of its charge to mass ratio in C/kg. How do I solve this?
*September 7, 2011*

**Chemistry**

What is the chemical name for BeCrO4*5H2O?
*September 7, 2011*

**math**

Find the distance that the earth travels in seven days in its path around the sun. Assume that a year has 365 days and that the path of the earth around the sun is a circle of radius 93 million miles. [The path of the earth around the sun is actually an ellipse with the sun at...
*September 2, 2011*

**Chemistry**

That's how I did it but the computer said it was wrong. I guess I'll have to ask the teacher about it. Thanks for your help!
*August 31, 2011*

**Chemistry**

Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 2.7 (femtometers) and the radius of the atom is approximately 70 (picometers). The volume of the nucleus is 8.2×10^−8 pm^3 And the volume of the atom is 1.4×10^6 pm^3 I ...
*August 31, 2011*

**geometry**

If X=5 units, x=11 units, h=10 units, what is the area of trapezoid shown above
*August 28, 2011*

**history**

what animal was a source of food for early hunters yet is not in existence today?
*August 18, 2011*

**history**

Where do archaeologists believe early Americans came from?
*August 18, 2011*

**Math**

Samual is 5 in , taller than Jackie - 8 shelly is 0.7 in taller than Jackie whos taller?
*August 18, 2011*

**Math**

The temperature at 3:00 am was -17 f by noon the temperture was -17.8 f at what time was it the coldest?
*August 18, 2011*

**math**

Evaluate write in simplest form Y - for y = -6 and z = -20 z
*August 18, 2011*

**CalcULUS**

nevermind
*July 16, 2011*

**CalcULUS**

Find slope of f(x)=x^3–2x^2+2x+2 on the interval (–3–1).
*July 16, 2011*

**CALCULUS**

Consider the function f(x)=sqrt(2–5x^2), –5≤x≤1. The absolute minimum value is ____ and this occurs at x equals ______? Found the max value to be 2 at x=0.
*July 16, 2011*

**math**

Thanks Reiny it helped alot
*July 12, 2011*

**physics**

A 3 kg toy car with a speed of 10 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 3 m/s. If the cars are locked together after the collision with a speed of 4.80 m/s, how much kinetic energy is lost?
*June 26, 2011*

**Algebra 1**

complete. 6t to the 2nd power - 23t + 20=(3t - 4)(2t - .....)
*June 26, 2011*

**Algebra 1**

Complete. g to the 2nd power - 8g+16=(g - 4)(g....4)
*June 26, 2011*

**Math**

Luis is 10 years older than his brother. Next year, he will be three times as old as his brother. If the brother's age is represented by a, what is Luis' age? What will be the brother's age next year?
*June 26, 2011*

**statistics**

Suppose you want to test the claim that mu is not equal to 3.5. Given a sample size of n = 31 and a level of significance of alpha = 0.10 when should you reject Ho? A) Reject Ho if the standardized test statistic is greater than 2.575 or less than -2.575. B) Reject Ho if the ...
*June 21, 2011*

**peresonal finance**

how does education plays a critical role in financial success
*June 3, 2011*

**American Studies**

Affordable housing and improved transportation allowed people to begin to move away from central cities to the suburbs Think: When did affordable housing and highways come about? The industrial revolution gave rise to urbanization Think: When was the first occurrence of ...
*May 28, 2011*

**American Studies**

Identify two causes of urbanization (growth in city life) and explain how each changed the geography of the United States.
*May 28, 2011*

**calculus**

Pretend the program in Senegal had been reducing infant mortality at a rate of 12.2 % per year. How long would it take for infant mortality to be reduced by 31 %?
*May 15, 2011*

**chemistry**

If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9 of the radioactive material has decayed so that you can safely wear the shoes again?
*May 12, 2011*

**math **

heelp me with scientific nottion
*May 2, 2011*

**history**

In the 1950's, how did some corperations expand to protect themselves against the dangers of economic downturns?
*April 26, 2011*

**families in crisis**

What are some of the unique challenges facing Native American (Indian American) families, as described in pp. 471-487 in Ferguson? (Shifting the Center: Understanding Contemporary Families by Susan Ferguson) How is ageing seen differently in the Apache community than it is ...
*April 21, 2011*

**Chemistry**

A 10.0 ml sample of vinegar which is an aqueous solution of acetic acid, requires 16.5ml of a 0.500M NaOH solution to reach the endpoint in a titration (where the moles of acid are equal to the moles of base). What is the molarity of the acetic acid solution?
*April 19, 2011*

**finance**

It would take 11 years
*April 14, 2011*

**math**

Write a formula for the height of a trapeziod based on the formula for it area A= 1/2(base1 + base2)h
*April 13, 2011*

**Math**

Five balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white.
*April 10, 2011*

**Calc**

Suppose f(x,y) = A - (x^2 + Bx + y^2 +Cy). What values of A, B, and C give f(x,y) a local maximum value of 15 at the point (-2,1)? Any help would be appreciated!
*April 4, 2011*

**math**

Umm I think Its 60, if I know what you mean, if its a triangle. ( learned that if you press alt and 0176, it will give you the degree sign. A triangle is 180°. You take 40+80, and get 120. So then you take 180-120, and get 60°.
*April 3, 2011*

**physics**

2339
*April 3, 2011*

**Polynomial- Doublecheck2**

Thank You :)
*April 3, 2011*

**Polynomial- Doublecheck2**

I asked this earlier, but I didn't get an answer. I'm glad though, because I found a couple of typos. I can get someone to check these for me... I have to get an A, and I was wondering if someone could double check these for me. I am about 95% sure they are right, but ...
*April 3, 2011*

**math polynomials**

Alright, thank you:)
*April 3, 2011*

**math polynomials**

Simplify 4q^2-5q-1+8q^2+8q-9 A. -4q^2+3q+8 B. 12q^2+3q-10 C. -12q^2-13q-10 D. -4q^2-13q+8 I'm pretty sure its B. 12q^2+3q-10 Add (4x-2y) + (7x-5y) A. 11x+3y B. 11x-7y C. -3x+3y D. -3x-7y I think this one is B. 11x-7y, also.
*April 3, 2011*

**math**

-20 If The signs are the same, its positive. If the signs are different its negative.
*April 2, 2011*

**math**

really? The answer is -8.
*April 2, 2011*

**Urgent Math please check**

Very Important I can get someone to check these for me... I have to get an A, and I was wondering if someone could double check these for me. I am about 95% sure they are right, but just need a fresh set of eyes. I know I've been sending alot, but I really need them to be ...
*April 2, 2011*

**math**

Thank you so much, Reiny. I really appreciate you taking time for so many questions.
*April 2, 2011*

**math**

I have 14 questions and I was wondering if someone could check my answers. This is a do or die situation. If I don't get an A, I may not get to graduate. I really appreciate you taking your time to double check theses for me. Thanks if you do. I know its a lot. They are ...
*April 2, 2011*

**Math**

If you multiply each by -2 -1*-2=2 2*-2=-4 -4*-2=8 8*-2=-16 -16*-2=32 So the missing numbers are 8,-16
*April 2, 2011*

**math-triangles**

finding the hypotenuse for triangles with only one measure of 7.8 m and two angles with degrees of 90 and 40. The picture is a right triangle with the right angle on the bottom left(labeled S). The hypotenuse goes from the top left(making angle Q with the line going up from S...
*April 1, 2011*

**math--Tangents**

Thanks
*April 1, 2011*

**math--Tangents**

Find the measurement of angle X given that tan X=0.5736 . Round to the nearest degree.
*April 1, 2011*

**Calculus**

"The production amount, Q, of an item manufactured by a company is modeled by the CobbDouglas function Q = 200(K^0.6)(L^0.4)(T^0.3) where K is the quantity of capital investment, L is the quantity of labor used, and T is the investment in training. Capital costs are $17 ...
*March 30, 2011*

**Pre Calc Trig**

Verify the following: tan( a + p/2) = -cot a a= alpha and p= pie since I do not have that button.
*March 29, 2011*

**Physics**

Oh and use the speed of sound of air (at 20 degrees C) to be v=343m/s.
*March 24, 2011*

**Physics**

Since it one end is open and the other is shut, the ear canal is considered a closed pipe. We set L = 2.3cm = 0.023m. The frequency for a closed pipe is fn=n(v/4L)=v/wavelength where n=1,2,3,.. referring to the number of overtones/harmonics. L=(1/4)*wavelength so we solve for ...
*March 24, 2011*

**alegbra 2**

if the length and width of the rectangle are 5 and 11 inches respectivly what is the approimate circufrence of the circle if the rectangle is inscribed inside the circle?
*March 24, 2011*

**Chemistry **

Describe how to prepare an aqueous 100 mL stock solution of 2 M sodium chloride solution.
*March 22, 2011*

**physics**

A car traveling at 26 m/s undergoes a constant decleration of 12 m/s^2. About how long di=oes it take the car to come to a stop?
*March 11, 2011*

**perimeter and area**

hvhj
*March 9, 2011*

**spanish**

True
*March 6, 2011*

**College Physics**

Vector A points in the negative y direction and has a magnitude of 6 units. Vector B has twice the magnitude and points in the positive x direction. Find the direction and magnitude of vec A-B and Vec B-A?
*March 2, 2011*

**Calc**

"Let f(x,y)=2(x^2)y-(y^3)+x-4. a) Find the local linearization of f at (3,1) b) Compute the directional derivative of f at (3,1) in the direction towards the point (-2,3). At (3,1), is the function f increasing or decreasing in the direction towards the point (-2,3)? Give...
*March 1, 2011*

**Calc**

The temperature at any point in the plane is given by the function T(x,y)= 100/(x^2+y^2+1). Find the direction at the point (3,2) in which the temperature does not increase or decrease. Help, please? Thanks!
*February 28, 2011*

**Calc**

The question that I'm stuck on is this: "Let f(x,y)= x^(2)*ln(y). Find the average rage of change of f as you go from (3,1) to (1,2) and find the instantaneous rate of change of f as you leave the point (3,1) toward (2,1)." Any help would be appreciated. Thanks!
*February 27, 2011*

**Calc: Difference quotients**

"Use difference quotients with delta(x)=0.1 and delta(y)=0.1 to estimate fx(1,3) and fy(1,3) where f(x,y)=e^(-x)sin(y)." I don't know how to solve this problem. Could someone walk me through it? Thank you so much!
*February 27, 2011*

**chemistry**

What is the pH of a solution prepared by dissolving 7.5g HCl in water to make 375mL of solution?
*February 27, 2011*

**physics**

A water balloon dropped from a dorm window does not break on impact. From what height would you need to drop the balloon to double the speed of the balloon?
*February 25, 2011*

**math**

a river flows at 2km/hr and sarah takes 6 hrs to row 16km up the river and 16km back.how fast did she row?
*February 23, 2011*

**5th grade math**

the johnsons has ben verry bussy and havet done laundry in several weeks the dirty cloth pile hase 540 cloths they figur they can put 27 pices of clothing in a singal load. how many loads of laundry will the johnsens family to do to wash all the itams of clothing
*February 15, 2011*

**sciene**

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball?
*February 9, 2011*

**Chemistry**

Thanks. Would it matter which molarity I use if I used M1V1 = M2V2
*February 5, 2011*

**Chemistry**

How do I find the molarity of Fe(SCN)2+? I know the molarity of SCN=0.1 and the molarity of Fe is 0.0001. The volume of SCN is 5 mL and the volume of the Fe is also 5mL. I also think that I use M1V1=M2V2.
*February 5, 2011*

**Chemistry**

How many moles of dinitrogen pentoxide are needed to produce 1.25 moles of nitric acid?
*February 3, 2011*

**Chemistry**

How many moles of nitric acid will be produced when 0.35 moles of water reacts?
*February 3, 2011*

**math**

In a gift wrapping department, a customer can choose from x different papers, y different ribbons, and z different greeting cards. There are 160 different paper, ribbon, and greeting card combinations possible. List three of the possible combinations. Need help...please.
*February 2, 2011*

**math**

The third and seventh terms of an arithmetic sequence are 10 and 20. 1) What is the value of the 1st term? 2) What is the value of the 9th term? 3) What is the equation to find the nth term in the sequence? HELP!! PLEASE!!
*February 2, 2011*

**Chemistry 1**

How many grams of a stock solution that is 92.5 percent H2SO4 by mass would be needed to make 250 grams of a 35.0 percent by mass solution? Can you please teach me how to do this? I get the other stoichiometry stuff, but this one tripped me up because I don't know how to ...
*February 1, 2011*

**chemistry**

A 0.100 mol sample of H2S is placed in a 10.0 L reaction vessel and heated to 1132°C. At equilibrium, 0.0285 mol H2 is present. Calculate the value of Kc for the reaction below at 1132°C. 2 H2S(g) 2 H2(g) + S2(g)
*January 31, 2011*

**Calculus**

A particle moves at varying velocity along a line and s=f(t) represents the particle's distance from a point as a function of time, t. Sketch a possible graph for f if the average velocity of the particle between t=2 and t=6 is the same as the instantaneous velocity at t=5...
*January 29, 2011*

**Chem**

What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution?
*January 27, 2011*

**Calc**

lim as x --> infinity of (x^2-16)/(x-4) is 8 By graphing, find an interval for near zero such that the difference between your conjectured limit and the value of the function is less than 0.01. In other words, find a window of height 0.02 such that the graph exits the sides...
*January 25, 2011*

**physics**

Can you help me with this one also? I know how to do it with 3 vectors but I can't seem to draw it with 4 vectors. The magnitudes of the four displacement vectors shown in the drawing are A=16.0 m, B=11.0 m, C=12.0 m, and D=26.0 m. Determine the (1) magnitude and (2) ...
*January 23, 2011*

**need help **

i'm in the 4th grade i need a socialstudy project to do rightnow i cant seam to think of anything can you help me please and thankyou
*January 23, 2011*

**physics**

A person is standing at the edge of the water and looking out at the ocean (see the drawing). The height of the person’s eyes above the water is h=1.6 m, and the radius of the earth is R=6.38x10^6 m (use as a precise value). (1) How far is it to the horizon (in meters, ...
*January 23, 2011*

**calculus**

Use a graph to estimate the limit: lim θ->0 (sin(5θ)/θ) Note: θ is measured in radians. All angles will be in radians in this class unless otherwise specified.
*January 22, 2011*