Tuesday
August 30, 2016

Posts by brittany

Total # Posts: 918

Trig
1. Establish the identity: sin(theta+3pi/2)=-cos(theta) 2. Find the exact value of 2(theta) if sin(theta)=5/13 3. Show that: csc2(theta)-cot2(theta)=tan(theta) 4. Find the exact value of tan(cos^-1(square root of 3/2) 5. Approximate the value rounded to two decimal places: csc...
December 7, 2011

science
which of the following is a testable hypothesis helium, ammonia, oxidation-reduction?
December 6, 2011

physics
A hockey player shoots a puck, exerting a constant force of 30.0 N on the hockey puck for 0.16 seconds. What is the magnitude of the impulse given to the puck? 190 kg ∙ m/s 98 kg ∙ m/s 9.6 kg ∙ m/s 4.8 kg ∙ m/s
December 2, 2011

geometry
the angles in a pentagon measure x-30,x+20,x-30, x+30 and x find the measure of each angle.
November 28, 2011

geometry
the angles in a hexagon are 135, 62, 151, 140, x and x +6. find the measure of the missing angles.
November 28, 2011

chemistry
What is the solubility of silver carbonate in 0.1 M Na2CO3
November 17, 2011

chemistry
What is the solubility of silver carbonate (Ag2CO3) in pure water
November 17, 2011

world history
How did powerful families of Japan like the Fujiwara legitimate their power at court?
November 8, 2011

geometry
If the sum of the lenghts of two sides of a triangle is 15, what is the largest possible integral value for the third side?
October 17, 2011

chemistry
PE increases
October 11, 2011

Language
Buttering
October 6, 2011

Algebra 2
How do you find a shaded area of a rectangle of 24 ft and 40 ft and 100 ft
October 1, 2011

help please!:-)
It wasn't right :(
October 1, 2011

World History 201
I need help with one T or false guestion. I don't know if this is true or false As a christian, persian king khosrow I forbade zoroastrian teaching troughout his empire.
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

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

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