Friday

April 18, 2014

April 18, 2014

Total # Posts: 175

**calculus**

A ball was tossed into the air. its height, in metres, is given by h(t)= - 4.9t^2 + 6t + 11, where t is time, in seconds. Write an expression that represents the average rate of change over the interval 2<t<2 + h.

**calc**

How long will it take for the population to reach 10 times its initial level? y=50(e)^(0.5t)

**Calculus**

Identify the coordinates of any local extrema of the function y=e^x - e^(2x).

**Calculus**

Determine the equation of the line perpendicular to the tangent line to the function f(x) = 1/2 (e^x)at the point on the curve where x=ln3.

**Calculus**

Solve: 20 = 10 (2^x)(ln2)

**vectors **

Find the distance between the parallel line and plane: l: r=[2,0,1] + t[1,4,1] pi: 2x - y + 2z = 4

**Calculus**

Write a scalar equation of each plane, given its parametric equations. x = 3 - 2s + 2t y = 1 + 3s + t z = 5 - s - 2t

**VECTORS **

Write a scalar equation of each plane, given its vector equation. [x,y,z] = [3,7,-5] + s[1,2,-1] + t[1,-2,3]

**English**

What is the point of view of the followng quote from the story Journey "you turn onto this road, which winds among the foothills and forests and goes through several small villages"

**calculus**

What conditions must be satisfied by vectors u and v for this to be true? |u + v| >|u - v|

**CALCULUS **

Under what conditions does |proj of a on b| = |proj of b on a| for two non zero vectors? Show why.

**english**

what are the indefinite pronouns

**Math 6th grade**

45 divided by three is 15!

**Math--**

The answer is (A)

**chemistry**

What is the chemical equation for: 1. Cyclohexane and Potassium Manganate VII 2. Cyclohexen and Potassium Manganate VII

**6th Grade Math**

blue yellow yellow green green red blue yellow yellow green green red blue yellow yellow green green red blue yellow yellow green green red blue yellow yellow green green red blue yellow yellow green green red blue yellow yellow green green red blue yellow yellow green green r...

**6th grade**

Modifies means describes

**6th grade**

4.5

**6th grade science**

Well you can get a small candle, light it up,put wax on a plate, stick it on the plate,pour a little water on the plate about an inch,and then put the glass cup on it.it will suck up the water.it has to do with the water taking the oxygens place.

**6th grade science**

Well you can get a small candle, light it up,put wax on a plate, stick it on the plate,pour a little water on the plate about an inch,and then put the glass cup on it.it will suck up the water.it has to do with the water taking the oxygens place.

**6th Grade Science**

they use radars from the satelites

**6th Grade Grammar**

several,and fewer

**Chemistry **

How much would 3.45* 10^21 C12H22 O11 molecules weigh

**6th grade**

puzzled unsure befuddled lots:)

**English**

fill in the blanks!

**6th Grade Math**

maybe rectangular prism

**6th grade - English**

ugly and beautiful

**6th Grade Grammar**

past perfect!

**6th Grade Grammar**

past perfect

**Chemistry**

What are the balanced equation for the following reactions: HCl and Sodium Hydrogen Carbonate HCl and Copper oxide HCl and Calcium carbonate HCl and Magnesium NaOH and Ammonium Chloride

**Chemistry**

What is the boiling point of heaxane?

**Pre Algebra**

Which product equals 3t-12? a. 4(t-3) b. (4-t)3 c. 3(t-4) d. (3-t)4

**6th grade science**

I am having trouble with getting focused on WANTING to do my schoolwork. I want good grades and I am just not motivated!!

**6th grade science**

I am having trouble with getting focused on WANTING to do my schoolwork. I want good grades and

**Geometry**

The midpoint of line segment AB is (1,2). The coordinates of A are (-3,6). Find the coordinates of B. I know how to figure out midpoint, but I'm having trouble figuring out how to do this problem. Any help would be appreciated. :)

**7th grade**

1/3 converts too?

**5th grade math**

what is -7+(-3)=_______

**5th grade math**

Ms. Sue is right a foot does equal 12 inches

**math**

the area of the circle was measured to be 29/30 of it original area.find the percentage error made in measuring area.

**SOCIOLOGY**

what are task groups, self/awareness groups

**Geography**

this is good

**English-Jane Eyre**

I'm so sorry to trouble you with these typos! And thanks so much for the corrections! But in my computer, I don't have any upside down exclamatory marks. They are both apostrophes. I don't know why it shows that way. (weird!!) And when you said hyphens, doesn't...

**English-Jane Eyre**

This is a book review that I have wrote for Jane Eyre by Charlotte Bronte. Could you please check if I have any obvious mistakes and give me a comment for this? Or a grade out of 20? 1. Title: Jane Eyre 2. Author: Charlotte Bronte 3. Genre: Romance, Gothic, Bildungsroman 4. Da...

**sequnces**

my teacher said to find out about a sequce and find the man it is named after . it is 1,1,2,3,5,8,13,21........ and i have got to find out the rest

**math(sequences)**

plese help me

**math(sequences)**

well my teacher said to find out what this sequece ment and who was the man who invented it .it goes like 1,1,2,3,5,8,13,21 ............... and i have got to find out the rest too the last number

**trig**

Give the phase shift in radians (along x) of f (x) = sin(x plus 4t+3/7)

**trig**

Give the phase shift in radians (along x) of f (x) = sin (x - 3pi/5

**trig**

Please answer b)only a) If a triangle has angles of 35 and 65 degrees, what is the measurment of the third angle? Is it a right triangle? b)Find all angles of a right triangle triangle RST given that r = 18 cm and s = 20 cm

**trig**

Find all angles of a right triangle triangle RST given that r = 18 cm and s = 20 cm

**trig**

Work out the following identities a) sin theta/cos theta b) tan theta cos theta

**trig**

If an angle is pie radians, what is the arc length in radians?

**trig**

If an angle is 1 radian, what is the arc length in radians?

**chemistry**

b) Would a precipitate form? The Ksp of AgCl(s) is 1.8 x 10-10. Also, please check if my answer to be is also correct or not When comparing the ion product to Ksp, I see that 0.001375 is greater than 1.8 x 10^-10, therefore a precipitate will form.

**chemistry**

Question:A solution of AgNO3 (45 mL/0.45 M) was mixed with solution of NaCl (85 mL/1.35 x 10-2 M) a) Calculate the ion product of the potential precipitate. My answer: mol AgNO3 = M x L = 0.45 M x 0.045 M = 0.02025 mol NaCl = M x L = 0.0135 M x 0.085 L = 0.0011475 (Ag^+) = mol...

**chemistry**

Please judge my answer Question:A solution of AgNO3 (45 mL/0.45 M) was mixed with solution of NaCl (85 mL/1.35 x 10-2 M) a) Calculate the ion product of the potential precipitate. b) Would a precipitate form? The Ksp of AgCl(s) is 1.8 x 10-10. Answer: For a, doing the ion prod...

**chemistry**

Please judge my answer, thank you Question: What is the pH of a 1.24 mol/L solution of HCN(aq) if its Ka = 6.2 x 10-10? Answer: It is imperative to initially set up ionization. THen, it becomes important to write the Ka expression, after which setting up an ICE table becomes n...

**chemistry**

Please judge my answer: Question: 24 mL of 0.39 mol/L acetic acid is titrated with a standardized 0.33 mol/L KOH solution. Calculate the pH of the solution after 17 mL of the KOH solution has been added. Assume the Ka of acetic acid is 1.8 x 10-5. Answer: The equation for this...

**chemistry**

rats....:)

**chemistry**

Please let me know if my answer to the following question is correct. Question: What is the concentration of a weak base if its Kb = 1.4 x 10-11 and its pH = 8.75? Answer: Converting pH to H^+ concentration using the formula H^+ = 10^-ph, therefore 10^-8.75 gives an H^+ concen...

**chemistry**

Please let me know if my answer is correct. Question: A weak base with a concentration of 1.3 mol/L has a percent ionization of 0.72%. What is the Kb of this weak base? Answer: Calling the weak base SHO, SHO --> S^+ plus HO^-. I know that the formula for Kb, therefore, will...

**chemistry**

Please let me know if my answer to the following question is correct. Question: 25 mL of standardized 0.45 mol/L NaOH is titrated with 21 mL of 0.35 mol/L acetic acid. Calculate the pH of the solution. Answer: Add 25 mL and 21 mL to get 46 mL. Add 0.45 mol/L and 0.35 mol/L to ...

**ALGEBRA WITH PIZZAZZ**

anybody have the riddle to why do elephants have ivory tusks.

**science**

Does the mass of tap water change when salt is added.

**government**

So in communism, it is the government that controls the economy whereas in democracy the people control it?

**government**

Do not they both mean that the government is solely in charge, not the people?

**government**

What is the difference between a totalitarian and a communist government? Thank you!

**social studies-Ms. Sue**

Thanks a million!

**social studies-Ms. Sue**

"Immigrants have frequently been accused of taking jobs from "real" Americans. Politicians who oppose immigrants often use this as a reason. The problem with this argument is that many immigrants work very hard for minimum (or lower) wage that doesn't attrac...

**social studies**

Is there a specific reason why these politicians like to use immigrants as a scapegoat?

**social studies**

According to Wikipedia, "the problems which are purportedly caused by immigrants equally exist amongst native-born populations as well, and that politicians often use immigration as a convenient scapegoat to distract the public from real social, political and economic pro...

**Calculus**

How do you prove area of a circle? Integrate an incremental area dArea = r dr dTheta from r=0 to R, and Theta from zero to 2PI radians. Area= INT INT dTheta rdr dTheta Area= 2PI (1/2 R^2)= PI R^2

**social studies**

gender issues applied to learning and development Boys’ stereotypes in k-12 to Grade 2 . How these issues will affect boys’ learning and development? Girls’ stereotypes in K-12 TO Grade 2. – How these issues will affect girls’ learning and development?...

**science**

tell me about the carbon cycle. what are the steps in it? http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CarbonCycle.html