Thursday

May 28, 2015

May 28, 2015

Total # Posts: 110

**Physical sci**

A copper rod is 22 mm long at room temperature (20c). What length does it expand to when placed in a 757 degrees Celsius furnace?
*March 31, 2015*

**Physical science**

A 478.18g ice cube is taken out of the freezer at -8.5 degrees Celsius. how much heat s needed to turn it in to steam?
*March 31, 2015*

**Math**

Simplify [(4x^2)^-1 / (-2x^-2)^-3]^-2
*February 7, 2015*

**Math**

Simplify the following 1. [(4x^2)^-1]^-2 / [(-2x^-2)^-3]^-2 2. [(8x^9) / (2x^5)]^-2 3. (-15x^-3) / (25x^-5)
*February 4, 2015*

**Math**

Find the value of the variable that would make each equation true. 1. 7^x^2 = 7^2x-1 2. 9^2(x-1) = 9^3x+1
*February 4, 2015*

**Math**

True or False. If possible kindly explain why so that I can understand it. Thanks much. 1. f(x) = 1^x is not an exponential function. 2. Every exponential function is strictly increasing.
*February 4, 2015*

**Math**

Which of the following describes an exponential growth? a. a population grows 5% each year b. the area of a square of side s c. the cost of an apple per kilogram d. the height of a person with respect to his age. Is A the right answer?
*January 23, 2015*

**Math**

Complete the table of values for the function y = 4(1^x/2)^x: x -3 -2 -1 0 1 2 3 y ___ ____ _____ ____ ____ ____ __
*January 23, 2015*

**Math**

Which of the following is a decreasing function? a. y = 7^x - 2 b. y = 7^-x + 2 c. y = 3(5^x) - 5 d. y = 5(3^x) + 3 What function is the reflection of y = 10^x with respect to the y-axis? a. y = -10^x b. y = (-1/10)^x c. y = 10^-x d. y = -10^x
*January 22, 2015*

**Math**

Answer with Always, Sometimes or Never True. Kindly explain why so that I can understand. Thanks. 1. An interior angle and an exterior angle of a triangle are supplementary. 2. The bisector of an angle of an isosceles triangle is also a perpendicular bisector. 3. The sum of ...
*January 22, 2015*

**Math**

Which of the following is a decreasing function? a. y = 7^x - 2 b. y = 7^-x + 2 c. y = 3(5^x) - 5 d. y = 5(3^x) + 3 What function is the reflection of y = 10^x with respect to the y-axis? a. y = -10^x b. y = (-1/10)^x c. y = 10^-x d. y = -10^x
*January 21, 2015*

**Math**

Which function is increasing? a. y = -2^x b. y = 2 (1/2^x) c. y = 3 (4^-x) d. y = -4 (2^x) What is the y-intercept of the function y = 4(2^x) - 2? a. 2 b. -2 c. 4 d. 1 In the function y = 4(3^x) - 1, the graph is asymptotic to ..... a. y = 1 b. y - axis c. y = -1 d. x - axis
*January 21, 2015*

**math**

al has 7 1/2 pounds of flour. he used 3/4 of the flour to make bagels. how many pounds of flour did he use?
*January 15, 2015*

**Math**

If x^2=25-y^2, what is the value of [(d^2)(y)]\[dx^2] at the point (3,4)?
*December 2, 2013*

**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)
*December 1, 2013*

**chemistry**

What is the molarity of a solution containing 18.0g of KCl in 262mL of KCl solution?
*November 6, 2013*

**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
*August 20, 2013*

**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...
*July 31, 2013*

**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 ...
*May 20, 2013*

**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 ...
*May 8, 2013*

**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 ...
*May 5, 2013*

**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?
*May 4, 2013*

**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 ...
*April 8, 2013*

**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 ...
*April 8, 2013*

**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?
*April 8, 2013*

**Creative writing**

Thank you!
*February 28, 2013*

**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?
*February 28, 2013*

**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?
*February 26, 2013*

**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
*February 12, 2013*

**Creative Writing**

How do you describe a pouty face in writing?
*January 27, 2013*

**Math**

Find the Pythagorean triple with the following equations: m=2, n=3... I'm thinking its a no solution?
*January 14, 2013*

**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
*October 18, 2012*

**algebra**

x/8=-8/30 30x=-64 x=-64/30=-32/15
*March 11, 2012*

**Physics**

never mind. I figured out that it was 0.254m^2
*March 11, 2012*

**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.
*March 11, 2012*

**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 ...
*February 24, 2012*

**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.)
*February 24, 2012*

**Education**

how much influence do you believe the government should have in deciding what is or is not being taught?
*February 10, 2012*

**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
*February 10, 2012*

**Physics**

what is 15E3 and how do you know the mass of Near?
*December 13, 2011*

**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 ...
*December 13, 2011*

**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 ...
*December 13, 2011*

**math**

class 33 girls x+5 boys x x+x+5=33 2x=28 x=14 boys and 19 girls
*December 13, 2011*

**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 ...
*December 13, 2011*

**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 ...
*December 13, 2011*

**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...
*November 18, 2011*

**math**

1188 ft^3
*November 17, 2011*

**math**

no the answer is 253
*November 17, 2011*

**math**

yes. z+26 would be written in a word problem as 26 more than z
*November 17, 2011*

**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 ...
*November 17, 2011*

**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
*November 17, 2011*

**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?
*November 13, 2011*

**algebra**

multiply both sides by x to get 30+20-20x=x 50=21x x=50/21
*October 30, 2011*

**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
*October 30, 2011*

**Math**

A)$910.00 B)35%
*October 30, 2011*

**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%
*October 30, 2011*

**Math**

35/80=.4375 answer times 100 is 43.75%
*October 30, 2011*

**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
*October 30, 2011*

**Physics**

oh, thank you. I forgot to do that after my calc homework
*October 30, 2011*

**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?
*October 30, 2011*

**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...
*October 30, 2011*

**Physics**

How much force is required to accelerate 7.0 g object at 11000 "g's" in a centrifuge?
*October 30, 2011*

**Math**

(x+8)(x-8)
*October 30, 2011*

**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 ...
*October 30, 2011*

**Living environment**

(4) diffusion
*October 27, 2011*

**Calculus**

find the dy/dx of s(t)= (4/3pi)sin3t+(4/5pi)cos5t
*October 19, 2011*

**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
*October 18, 2011*

**Calculus**

find the limit as x approaches zero of (3sin2x)/sin7x and show work is it 6/7?
*October 18, 2011*

**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
*October 18, 2011*

**Calculus**

find the limit as x approaches zero of (3sin2x)/sin7x and show work
*October 18, 2011*

**Math**

sam made 21 wilbur made 27 7x+6=9x 6=2x x=3 7x3=21 9x3=27 27-21=6
*October 18, 2011*

**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?
*October 13, 2011*

**Math**

1) 5hours 15 minutes 2)10 minutes
*October 13, 2011*

**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?
*October 13, 2011*

**11 French**

sentence two: symbolisent sentence three: L'Allemagne soccer= foot check case with croire put commas in last sentence
*October 13, 2011*

**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
*October 13, 2011*

**6th grade math**

4min24sec <or= x <or= 5min12sec
*October 12, 2011*

**Valid statements**

1) a beta 2)delta is either an theta or a sigma
*October 12, 2011*

**Math**

d: x>a
*October 12, 2011*

**calculus**

find the horizontal tangents of the curve and show work y=5x^3-3x^5
*October 12, 2011*

**algebra**

-18+|-12| -18+12 -6
*October 12, 2011*

**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
*October 12, 2011*

**math**

55-22=33 33/55=x/100 55x=3300 x=3300/55 x=60%
*October 12, 2011*

**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
*October 12, 2011*

**math**

.45<9.06, no
*October 12, 2011*

**Calculus**

find the horizontal tangents of the curve and show how. y=x^3-2x^2+x+1
*October 12, 2011*

**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?
*October 10, 2011*

**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
*October 10, 2011*

**algebra**

C(66)=0.42(66)+39 C(66)=ll.72
*October 2, 2011*

**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.
*October 2, 2011*

**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 ...
*October 2, 2011*

**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 ...
*December 15, 2010*

**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 ...
*December 15, 2010*

**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?
*December 15, 2010*

**Algebra 7th Grade**

what is the third term of 1/2
*November 29, 2010*

**science**

why do teachers tell u to go do some homework...and they have not taught u it huh???
*May 4, 2010*

**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!!!!
*March 16, 2010*

**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?
*January 27, 2010*