# Posts by Sophie

Total # Posts: 489

**math**

3.6

**math**

Find a parametric description for the ellipse having the focus F=(0,-4), corresponding directrix y=3, and eccentricity e=3/4.

**math**

What is the distance between the parallel planes: ax+by+cz=d1 and ax+by+cz=d2?

**math**

Is it possible for the lengths of a right triangle to form a geometric sequence? If yes, determine the lengths and the measures of the acute angles. if it's not possible, explain why not.

**math**

illuminated by the rays of the setting Sun, Kelly rides along on a merry-go-round casting a shadow on a wall. The merry-go-round is turning 36 deg per sec. Kelly is 25 ft from its center, and the Sun's rays are perpendicular to the wall. At what rate is the shadow moving ...

**Math**

What is the distance between the parallel planes 2x+y-3z=13 and 2x+y-3z=35?

**math**

why do you have = signs in part a?

**math**

Given the plane 2x-3y+7z=4, a) Find the equation for the line perpendicular to the plane that intersects the plane at the point P=(6,5,1). b) How far is it from the point (4,-2,3) to the plane?

**math**

Apply logarithms to create a linear relationship: ((x^3)(y^1.5))/(z^.5)=k

**english homework**

Are there language errors? please

**english homework**

nobody?! please help me

**english homework**

Hello, sorry I just saw the last message then I would like help in order to correct the dialogue: spelling, vocabulary, grammar... Be intransigent even if it's my second language tell me if something can seem illogical Look at the dialogue: D: doctor M: patient's ...

**english homework**

thanks

**english homework**

Hello! I have to write a dialogue with 3 characters, the subject is "hello doctor!" I probably make a doctor with a patient and the patient's mother, my idea consists of simulating (a lot of )illnesses in order to not to go to school (it's about the little ...

**math**

oups sorry 36x3=3 yards

**math**

36 inches=3 yards 36=1,2,3,4,6,6,9,12,18,36 W<12 W>6

**physics**

20.7

**Calc**

find the slope of the tangent to the curve: y^2=x^3/xy

**Calculus**

find the derivative of 4x(lnx+ln9)-9x+e

**Calculus**

find the derivative of g(a)=sin(arcsin(9a))

**physics**

a crate is pushed to the top of a frictionless inclined plane 15 m long with a force of 25 N. If the crate weighs 125 N, how high is the inclined plane? 0.5 m 1 m 3 m or 5 m

**math**

what is 8x-2y=-6 please help in simple form

**maths**

i have got to find the perimeter of a triangle that has one side of 8x-7w another that says 3x+9y and then another that says 3y+5w whats the perimeter of the triangle ??? please help

**science**

How many moles of oxygen molecules, O2, are required to produce 0.268 mol of K2Cr2O7? Show your work.

**Physics**

An isolated 3 kg object is moving in the positive y direction along the -y axis at 2 m/s; when it reaches the origin it breaks into two pieces sending a 1 kg fragment in the +y direction at a speed of 3.7 m/s. what are the velocity and direction of the other piece immediately ...

**Physics**

a 60 kg person falls off a 15 kg sled moving at 2 m/s. The person doesn't move after falling. Assuming no friction with the ice, and not other net forces acting on the sled, what is the change in velocity of the sled after the person falls off.

**10th grade math help**

How do you solve? 3-3sinx-2cos^2(x) = 0

**4th grade algebra**

-21... oh the days of fourth grade... have fun!

**math gr.6**

im in 6th grade but i have this book that says scott forson its blue

**Foreign Languages**

ok french and russian

**Foreign Languages**

o ok

**Foreign Languages**

how do you say goodafternoon in evry laungega

**english 6th grade**

what if it says Marco, my older brother, likes to play ________________ tennis. my older brother is underlined would that be nonrestrictive or restrictive

**english 6th grade**

Please help Ms.Sue its a six grade level.

**english 6th grade**

what does restrictive and nonrestrictive mean???????

**science**

what man made object has the greatest acceleration ?

**spanish 6th grade**

tnks

**spanish 6th grade**

how do you say what is your favorite food in spanish

**science**

is it condensationi am not sure

**science need help!**

i am doing questions and i just want to say i need help the question says ____________ affects how much moisture is in the air i don't get it

**math**

the area of a rectangle is 60cm.the length is 11cm more than the width. find the width.

**psyc**

Studies that have overcome methodological problems in examining intelligence scores for African-Americans as compared to people of Anglo- Saxon descent revealed: that the test results were useless because racial prejudice invalidated them. that African-Americans scored higher ...

**psyc**

According to Noam Chomsky, language is primarily acquired through: an innate mental module. our parents correcting us. imitating our parents. trial and error. I chose B. Is this right?

**psychology**

Now I am a little confused...was my first option right?

**2nd grade,science**

run dance play talk so much more!!!

**6th grade**

ok thank you so much! :)

**6th grade**

but what if the problem is 16 2/7 - 10

**6th grade**

sooo will it be the same if you had 16 2/7 -10 ______________ you would have to change 10 into 9 and and put 7/7 so it would be like this 16 2/7 -10 7/7 but you would have take something to make it a problem

**6th grade**

how do you solve a problem when you have one whole # with a whole # and fraction. this is subtracting ex: 16 -10 2/7 ________________

**math**

11/850 b/c 13/52*12/51*11/50

**english**

why is Theodor a hero and why is he so important

**Calculus**

Find the derivative by the limit process. 6/√(8x)

**Calulus**

Consider the following function. f(t) = 3t2 − 3 (a) Find the average rate of change of the function below over the interval [3, 3.1]. (b) Compare this average rate of change with the instantaneous rates of change at the endpoints of the interval. (at t = 3) (at t = 3.1)

**calculus**

The tangent line to the graph of y = h(x) at the point (-6, 9) passes through the point (6, 2). Find the following values. (a) h(-6) (b)h '(-6)

**Physics**

an canoe is 5.67 in m how long in cent?

**5th grade**

l=32 l=2 (e) l=5 (e) l=(2xe)+(5xe)=L e=4 m=8 o=20

**calculus**

Determine the equation of a curve in the xy-plane that passes through the point (0, 1) and has the slope x2 sin 4x at any point (x, y) on the curve.

**math**

3x³=90

**math**

-3.1

**writing**

I have to write a thesis statement on a belief i have that have changed and why

**General Chemistry**

What happens to the rate of evaporation of a liquid after… a. a decrease in temperature b. an increase in the surface area of a liquid exposed to air c. an increase in the intermolecular forces

**math**

This is a place for homework help, not for chatting and randomness.

**science**

The greatest velocity a falling object reaches is called its what?

**chemistry**

how many grams of copper hydroxide can b prepared from 2.7g of copper (II) nitrate and excess sodium hydroxide?

**chemistry**

how many grams of copper hydroxide can b prepared from 2.7g of copper (II) nitrate and excess sodium hydroxide?

**Math**

set S is composed of the square of every element of the set {-5,5}. what is S?

**Chemistry**

im not quite sure what to do with this problem... the info I have: -balanced equation= (CuCl2*2H20)=>CuCl2+2H2O -initial mass of copper compound: 0.94g Q: use stiochiometry to find the theoretical yield for the mass of copper (II) chloride we also used 30mL of water in our ...

**3rd grade**

How many day in a leep year?

**2nd grade**

no, mainly igneous rocks come from lava.

**art**

i am researching a piece of art work by frida kahlo and i need more infomation about he work, any sujestions?

**calculus**

Which has more area, the region in the first quadrant enclosed by the line x+y=1 and the circle x^2+y^2=1, or the region in the first quadrant enclosed by the line x+y=1 and the curve sqrt(x)+sqrt(y)=1? Justify your answer.

**Algebra**

what is "5x + 7 = 22" simplified? x

**social studies ww1**

what was united states policy toward the war when it broke out PLEASE HELLLLP

**social studies**

world war one

**social studies**

why did the nations of Europe go to war

**science**

a teacher does 140 J of work in 20 s. How much power did he use?

**science**

in the course of a short race,a car does 50,000 J of work in 7 s. What is the power of the car during a race?

**science**

a libraian lifts a box of books that weighs 93 N a distance of 1.5 m. How much work does he do?

**science**

as you push a lawnmower the horizontal force is 300 N. If you push the mower a distance of 500 m, how much work do you do?

**science**

dr.bob222 i don't get it can u give me the answer

**science**

how much power, in watts, is needed to cut a lawn in 50 min if the work ivolvled is 100,000 j

**science**

how much power, in watts, is needed to cut a lawn in 50 min if the work ivolvled is 100,000 j

**science**

suppose you are pulling a wagon with the handle at an angle. How can you make your task easier?

**math**

2

**social studies**

why did the us want to build a canal across panama 2 how did the us gain control of the panama canal zone 3 how did the people of panama feel about us control of the canal zone why 4 what agreement did the us make with panama in 1977 5 what are the countries of central America

**english**

were public places segregated in 1948

**science**

what is orbital motion and lubricant

**science8 intergeted**

what is lubricant and orbital motion

**chemistry, science**

Carbon is also removed from the atmosphere during the process of weathering. carbon dioxide combines with water to form carbonic acid. this reacts with calcium silicate (in rocks) to produce calcium ions, bicarbonate ions and silicon dioxide (silica) the chemical equation for ...

**physics**

1008176.54J

**General Chemistry**

Question 1: In the Balmer-Rydberg equation, what value of m is used to determine the wavelengths of the Balmer series? m=? Question 2: List a possible set of four quantum numbers (n,l,ml,ms) in order, for the highest energy electron in gallium,Ga.

**science**

what factors affect the friction forces between two surfeces 2a what is the law of universal gravitation

**science**

1a-b)what are the four types of friction what factors affect the friction force between two surfaces

**Math Data Management**

In how many ways can the 12 members of a volleyball team line up, if the captain and assistsant captain must remain together? Thank you in advance.

**French**

Some interesting facts about the euro tunnel, the eurostar and the shuttle?

**english**

thank u

**english**

Ihave just read me it is a disaster,sorry for the errors

**english**

Dear americans,I would like to retranscribe me the speech of obama in high school in Norfolk (video is on youtube) please make it for a French desperate person (it is my first year at high school) what methods shall I be able to use to understand English better?

**tech**

in tech we are reasearching inventors chefs and designers i chose to research, Gordan Ramsey i have all ready found out most of my info which i need to collect but i am having trouble with, .who is his inspieation. and .why did he become a chef.

**Trig problems**

Part 1) Evaluate tan 7.5 Part 2) Evaluate exactly cos (-(45pi(4)))