Friday

April 18, 2014

April 18, 2014

Total # Posts: 98

**Math**

If x^2=25-y^2, what is the value of [(d^2)(y)]\[dx^2] at the point (3,4)?

**Math**

At what point on the graph of y=(1/2)x^2-(3/2) is the tangent line parallel to the line 4x-8y=5? A. (1/2,-3/8) B. (1/2,-11/8) C. (2,3/8) D. (2,1/2) E. (-1/2,-11/8)

**chemistry**

What is the molarity of a solution containing 18.0g of KCl in 262mL of KCl solution?

**Calculus**

Find the limit of the following as x ->2 6-x, if x<2 2x+1, if x is greater than or equal to 2

**Creative Writing**

[Much like the wind that swirled around with a few fallen leaves, his mind whirled and buzzed with thoughts that would continue to move around, but never leave.] I can't think of a good way to describe thoughts like the 'wind.' Can anyone help, or does this already...

**Creative Writing**

I'm trying to explain something to one of my friends, and unfortunately, I'm not too good at that. Can someone help me explain (in a not-confusing way) WHY you put the comma in this sentence? [Millie, go get the papers off my desk.] or [What's wrong with you, you i...

**Calculus**

Using the equation x(t)= t^3 - 12t + 1, find the displacement during the first 3 seconds. And then find the velocity during the first 3 seconds. See, I know how to find velocity, but there's a question after that that says to find velocity when t=3...so how do you find it ...

**Creative writing**

This is a question I should know the answer to, but for some reason, I don't. People in my class write their dialogues like this: ["Carrie," I said, "What was my sister's name?"] Is that comma after 'said' supposed to be there, or should it ...

**Creative writing **

More descriptive ways to explain the color red instead of just saying it? I already compare it to the color of blood. Any other ideas?

**Creative Writing**

She didn't really give us a definition, just examples. She said that Shrek was a good one. And she told us of some story where Cinderella actually liked cleaning and didn't want to go to the ball. Things like that. A lot of kids turned theirs in today, just the story w...

**Creative Writing**

I know I asked this earlier, but right now I want to know if this is close enough to the original Alice in Wonderland to be a fractured fairytale (I've never seen Alice in Wonderland before and don't have enough time to watch it and write this before it's due): I w...

**Creative writing**

I have to write a fractured fairy tale, and I have 2 questions. 1) is Alice in Wonderland a fairy tale? And 2) If I wrote something about Alice who falls asleep in wonderland and is killed and forced to be there forever, does that count as a fractured fairly tale?

**Creative writing**

Thank you!

**Creative writing **

Does it make sense to say that someone was "spiraling towards the earth at breakneck speed" or should I pick a better word than spiraling? Any suggestions?

**Creative writing**

I want to write a story that is told ONLy through one person's mind; what this one person is thinking and saying, with no other characters speaking. How would you go about formatting it?

**Calculus**

Find the maximum height of a ball thrown upward from the top of a 640 ft tall building with an initial velocity of 128 ft/s

**Creative Writing**

How do you describe a pouty face in writing?

**Math**

Find the Pythagorean triple with the following equations: m=2, n=3... I'm thinking its a no solution?

**Chemistry **

How many moles of hydrochloric acid (pKa of HF=3.14) must be added to 500.0 mL of 0.30M sodium fluoride (NaF) to give a buffer of pH 3.50? Ignore the volume change due to the addition of hdrofluoric acid

**algebra**

x/8=-8/30 30x=-64 x=-64/30=-32/15

**Physics**

never mind. I figured out that it was 0.254m^2

**Physics**

The electric field between the plates of a paper-separated (K = 3.75) capacitor is 9.01X10^4 V/m. The plates are 1.95 mm apart and the charge on each plate is 0.775 µC. I figured out that the capacitance is 4.4e-9F but I need help finding the area.

**Physics**

A point charge (m = 1.0 g) at the end of an insulating string of length L = 51 cm (Fig. 16-66) is observed to be in equilibrium in a uniform horizontal electric field of E = 9200 N/C, when the pendulum's position is as shown in Fig. 16-66, with the charge d = 2.0 cm above ...

**Physics**

What is the total charge of all the electrons in a 13 kg bar of silver? (Silver has 47 electrons per atom and an atomic mass of 108 u.)

**Education**

how much influence do you believe the government should have in deciding what is or is not being taught?

**MATH**

Angle C and Angle D are vertical angles. The conclusion is that angle C and angle D are complementary. Which is a counterexample of this conclusion. * 2 vertical angles which are not complementary or * 2 complementary angles which are not vertical

**Physics**

what is 15E3 and how do you know the mass of Near?

**Physics**

The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroid's center. Eros is roughly box-shaped, with dimensions 40 km 6 km 6 km. Assume Eros has a density (mass/volume) of abo...

**physics**

The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroid's center. Eros is roughly box-shaped, with dimensions 40 km 6 km 6 km. Assume Eros has a density (mass/volume) of abo...

**math**

class 33 girls x+5 boys x x+x+5=33 2x=28 x=14 boys and 19 girls

**physics**

The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroid's center. Eros is roughly box-shaped, with dimensions 40 km 6 km 6 km. Assume Eros has a density (mass/volume) of abo...

**participial phrases**

I'm in the 4th grade and my teacher stated use the following participial phrases in a sentence of mine own, 1; Riding a bicycle, is great form of excersing. 2; being afraid, of the dark can be very frighting. having found the solution, now heres where I'm stuck can yo...

**Physics**

A 26.0 kg block is connected to an empty 1.00 kg bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.490 and the coefficient of kinetic friction between the table and the block is 0.320. Sand is gradually...

**math**

1188 ft^3

**math**

no the answer is 253

**math**

yes. z+26 would be written in a word problem as 26 more than z

**Physics**

A 26.0 kg block is connected to an empty 1.00 kg bucket by a cord running over a frictionless pulley (Fig. 4-57). The coefficient of static friction between the table and the block is 0.490 and the coefficient of kinetic friction between the table and the block is 0.320. Sand ...

**Math**

No. She fell asleep 1/2 way through sleeping.That left 6/12 of the trip to go. She woke up and still had 1/2 of the distance she traveled while she slept so she had 1/3 of half way to go. which means she slept for 4/12 of the trip or 1/3. Your answer is 1/3

**Calculus**

At time t >or= to 0, the position of a particle moving along the x-axis is given by x(t)= (t^3/3)+2t+2. For what value of t in the interval [0,3] will the instantaneous velocity of the particle equal the average velocity of the particle from time t=0 to time t=3?

**algebra**

multiply both sides by x to get 30+20-20x=x 50=21x x=50/21

**math**

85/x=80/100 (i got 80 because it was 100%-20%) 85*100 = 80*x 8500=80x divide both sides by 80 x = $106.25

**Math**

A)$910.00 B)35%

**Math**

NO. .35 is not a variable. Another way you could do it to prove that your answer is 43.75% is... 35/80= x/100 35*100=80*x 3500=80x divide both sides by 80 x= 43.75%

**Math**

35/80=.4375 answer times 100 is 43.75%

**math**

old cds = x new cds = 2.5x 4old cds + 9 new cds = 159 4(x) + 9(2.5x)=159 4x+22.5x=159 26.5x=159 x=6 so old cds cost $6. and new cds cost 2.5(6)=$15. Check: 4(6)+9(15)=159 24+ 135 =159 159=159

**Physics**

oh, thank you. I forgot to do that after my calc homework

**Physics**

I keep getting Vf= 1.56 m/s which webassign says is wrong. It's in the chapter about Newtons laws of motion so, even though it is not included in the question, could that have a bearing on my answer, and if so how?

**Physics**

Jean dangles her watch from a thin piece of string while the jetliner she is in takes off. She notices that the string makes an angle of 22° with respect to the vertical while the aircraft accelerates for takeoff, which takes about 18 seconds. Estimate the takeoff speed of...

**Physics**

How much force is required to accelerate 7.0 g object at 11000 "g's" in a centrifuge?

**math**

26

**Math**

(x+8)(x-8)

**Physics**

A city planner is working on the redesign of a hilly portion of a city. An important consideration is how steep the roads can be so that even low-powered cars can get up the hills without slowing down. It is given that a particular small car, with a mass of 1090 kg, can accele...

**Living environment**

(4) diffusion

**Calculus**

find the dy/dx of s(t)= (4/3pi)sin3t+(4/5pi)cos5t

**Math (Algebra)**

apple= x-24 banana= x 7x=10(x-24) 7x=10x-240 -3x=-240 x=80calories per banana check: 7(80)=10(80-24) 560=560

**Calculus**

find the limit as x approaches zero of (3sin2x)/sin7x and show work is it 6/7?

**Grammar**

walk is the verb and i pretty sure that let's is a gerund acting as a subject noun but you may want to check that

**Calculus**

find the limit as x approaches zero of (3sin2x)/sin7x and show work

**Math**

sam made 21 wilbur made 27 7x+6=9x 6=2x x=3 7x3=21 9x3=27 27-21=6

**Physics**

A ball is thrown horizontally from the roof of a building 55 m tall and lands 50 m from the base. What was the ball's initial speed?

**Math**

1) 5hours 15 minutes 2)10 minutes

**Physics**

A ball thrown horizontally at 22.3 m/s from the roof of a building lands 31.0 m from the base of the building. How high is the building?

**11 French**

sentence two: symbolisent sentence three: L'Allemagne soccer= foot check case with croire put commas in last sentence

**physics(Quick!)**

vo= 0 a=5.5m/s^2 v= 28 m/s t=? v=vo+at at=v-vo t=(v-vo)/a t=28/5.5 t=5.09 seconds

**6th grade math**

4min24sec <or= x <or= 5min12sec

**Valid statements**

1) a beta 2)delta is either an theta or a sigma

**Math**

d: x>a

**calculus**

find the horizontal tangents of the curve and show work y=5x^3-3x^5

**algebra**

-18+|-12| -18+12 -6

**Calculus**

find an equation for the line tangent to the curve at the given point and show how y=(x^4+2)/x^2, x=-1

**math**

55-22=33 33/55=x/100 55x=3300 x=3300/55 x=60%

**College Algebra**

f(x-1)=4(x-1)^2+5(x-1)+4 F(x-1)= 4(X^2-2x+1)+5x-5+4 f(x-1)= 4x^2-8x+4+5x-1 f(x-1)= 4x^2-3x+3

**math**

.45<9.06, no

**Calculus**

find the horizontal tangents of the curve and show how. y=x^3-2x^2+x+1

**vectors**

The summit of a mountain, 2075 m above base camp, is measured on a map to be 4585 m horizontally from the camp in a direction 32.4° west of north. Choose the x axis east, y axis north, and z axis up. What are x, y, and z?

**Math**

45 students assuming that when you say no one go the same order you mean that the first student could have gotten choc and choc and the second student got choc and vanilla and so on

**Math**

16

**Math**

16

**algebra**

C(66)=0.42(66)+39 C(66)=ll.72

**physics**

I'm really confused by this. What am i supposed to use for t in the first equation if i only know that t going up is t and t going down is 4-t. I can't find two variables with one equation and the first equation is solving for hf.

**physics**

Two stones are thrown vertically up at the same time. The first stone is thrown with an initial velocity of 12.5 m/s from a 12th-floor balcony of a building and hits the ground after 4.6 s. With what initial velocity should the second stone be thrown from a 4th-floor balcony s...

**Chemistry**

For the reaction: 2H+(aq) + CO3-2(aq) --> CO2(g) + H2O(l) A. Calculate the deltaHºrxn for the reaction. Given deltaHºf for CO3-2(aq) = -677.1 kJ/mol. B. Using the above reaction, what would be the final temperature of a coffee cup calorimeter when 0.104 mol of hyd...

**Chemistry**

A 16.48 g sample of potassium permanganate is dissolved in a 250.0 mL volumetric flask. A 125.1 mL sample of the potassium permanganate solution is added to 75.3 mL of 5.110 M hydrobromic acid in which 32.3 mL of ethanol has been dissolved (d = 0.7891 g/mL) in 3.337 L sealed r...

**Chemistry**

A 10.0 mL sample of 12.1 M hydrochloric acid is added to 90.0 mL of distilled water and added to a sealed 1.04 L reaction vessel containing 1.463 g of calcium hydrogencarbonate at 22.1ºC and 743 mmHg. What is the pressure of carbon dioxide gas?

**Algebra 7th Grade**

what is the third term of 1/2

**science**

why do teachers tell u to go do some homework...and they have not taught u it huh???

**English - oral**

How to structure a 1 minute speech. I have to write it on an achievement i had. My one is a sports 1st place ribbon. PLEASE HELP!!!!

**physics**

a person walks first a constant speed of 5.00m/s along a straight line from point A to point B and then back along the line from point B to A at a constant speed of 3.00m/s. (a) what is her average speed over the entire trip? (b) what is her average velocity over the entire trip?

**chem**

True/false 1. will addding a strong acid (HNO3) to a solution that is 0.010M in Ag(NH3)2(^+) will tend to dissociate the complex ion into Ag+ and NH4+ 2.adding a strong acid (HNO3)to a solution that is 0.010M in AgBr2(^-) will tend to dissociate the complex ion into Ag+ and Br...

**chemistry**

1. if 10mL of 0.004M AgNO3 is added to 10mL of 0.0024M K2CrO4, is either Ag+ or CrO4(2-) in stoichiometric excess? if so, which is in excess? 2. the Ksp for BaCrO4 is 1.2x10-10. will BaCrO4 precipitate upon mixing 10 mL of 1x10-4M Ba(NO3)2 with 10mL of 1.0x10-4M K2CrO4?

**chemistry**

thanks for your help, it worked out :)

**chemistry**

a buffer composed of 0.50mol acetic acid and 0.50mol sodium acetate is diluted to a volume of 1.0L. The pH of the buffer is 4.74. How many moles of NaOH must be added to the buffer solution to increase its pH to 5.74?

**chemistry**

thanks yall for your help

**maths**

i need help with writing expressions A) double the sum of 25 and 8 i think it is(2x25+8) B) the quotient of 15 and 3 subtracted from the product of 4 and 9 i think it is (5/3-4x9) C) the difference between 20 and 5 multiplied by the sum of 8 and 2 I think it is 20-5x8+2 D) 3 t...

**english**

Write an application letter in answer to the below. You may make up details but do not copy directly form sample letters in the study unit or any other source. Your letter should sound professional, but should also reflect something of your own personality. Remember that the a...

**written communications**

when your ordering goods from a distributor the best way to indicate the items you wish to order is to a. mention the items several times in the letter b. list items oj a separate sheet to accompany the letter c. list the items after the signature of the letter d. list the items

**Gen 105**

What sentence is nonagist We should hire a young person who knows more about technology. We should hire a person who knows more about technology.

**algebra**

How do you divide and simplify this? squareroot of 162a/6a^3 Thanks sqrt[162a/(6a^3)] = sqrt (27/a^2) = (sqrt 27)/a

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