Thursday
April 24, 2014

Posts by brittany


Total # Posts: 825

chemistry
What mass of H2SO4 would be required to react with 0.59 mol of NaOH?

Math
How do I find the relative maximum and minimum and the zeros of f(x)=-x^3+16x^2-76x+96??

english
what does SS stand for in Shurley Method?

Geometry
(3,-6)

phyics
Find the horizontal range of a baseball that leaves the bat at an angle of 63 degrees, with the horizontal with an initial velocity of 160 km/hr. discard air resistance

physics
the diver acheives a horizontal velocity of 3.75 m/s from a diving platform located 6.0 m above the water. How far from the edge of the platform will the diver be when she hits the water?

Statistics
A study shows that 10% of americans are left-handed. Find the probability that at most one student is left handed in a class of 20 students.

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...

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

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

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

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

chemistry
What is the solubility of silver carbonate in 0.1 M Na2CO3

chemistry
What is the solubility of silver carbonate (Ag2CO3) in pure water

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

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?

chemistry
PE increases

Language
Buttering

Language
Buttering

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

help please!:-)
It wasn't right :(

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.

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.

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.

Help please:-)
What is the most important key to an effective essay?

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.

Algebra 1 Scientific Notation
1.462828271x10^99

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?

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?

geometry
A.

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.

social studies
why might the earliest farming communities have developed along the Nile,Tigris,and Euphrates

social studies
how did rivres in southwest asia enrich the soil

math
the cube of what number is 2197?

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?

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:)

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

7th grade social studies
how did rivers enrich the soil

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?

Chemistry
Thank you!

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?

Chemistry
What is the chemical name for BeCrO4*5H2O?

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...

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!

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 fo...

geometry
If X=5 units, x=11 units, h=10 units, what is the area of trapezoid shown above

history
what animal was a source of food for early hunters yet is not in existence today?

history
Where do archaeologists believe early Americans came from?

Math
Samual is 5 in , taller than Jackie - 8 shelly is 0.7 in taller than Jackie whos taller?

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?

math
Evaluate write in simplest form Y - for y = -6 and z = -20 z

CalcULUS
nevermind

CalcULUS
Find slope of f(x)=x^3–2x^2+2x+2 on the interval (–3–1).

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.

math
Thanks Reiny it helped alot

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?

Algebra 1
complete. 6t to the 2nd power - 23t + 20=(3t - 4)(2t - .....)

Algebra 1
Complete. g to the 2nd power - 8g+16=(g - 4)(g....4)

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?

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 s...

peresonal finance
how does education plays a critical role in financial success

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 suburb...

American Studies
Identify two causes of urbanization (growth in city life) and explain how each changed the geography of the United States.

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 %?

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?

math
heelp me with scientific nottion

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

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 out...

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?

finance
It would take 11 years

math
Write a formula for the height of a trapeziod based on the formula for it area A= 1/2(base1 + base2)h

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.

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!

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°.

physics
2339

Polynomial- Doublecheck2
Thank You :)

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 ...

math polynomials
Alright, thank you:)

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.

math
-20 If The signs are the same, its positive. If the signs are different its negative.

math
really? The answer is -8.

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 ...

math
Thank you so much, Reiny. I really appreciate you taking time for so many questions.

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 al...

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

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)...

math--Tangents
Thanks

math--Tangents
Find the measurement of angle X given that tan X=0.5736 . Round to the nearest degree.

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 p...

Pre Calc Trig
Verify the following: tan( a + p/2) = -cot a a= alpha and p= pie since I do not have that button.

Physics
Oh and use the speed of sound of air (at 20 degrees C) to be v=343m/s.

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 ...

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?

Chemistry
Describe how to prepare an aqueous 100 mL stock solution of 2 M sodium chloride solution.

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?

perimeter and area
hvhj

spanish
True

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?

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...

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!

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