Friday

August 22, 2014

August 22, 2014

Total # Posts: 2,690

**Biochemistry**

Given that ∆Go’ = -15 kJ/mol and k1 = 1.5 X 10-6s-1, calculate k2.
*August 3, 2011*

**Math**

nvm, just solved it.
*August 3, 2011*

**Math**

Solve the equaton by completing the square. 4x^2-8x-3=0
*August 3, 2011*

**physics**

A tennis ball of mass 0.057 kg is served. It strikes the ground with a velocity of 54 m/s (120 mph) at an angle of 21° below the horizontal. Just after the bounce it is moving at 51 m/s at an angle of 19° above the horizontal. If the interaction with the ground lasts 0...
*August 2, 2011*

**physics**

A ceiling fan has four blades, each with a mass of 0.40 kg and a length of 65 cm. Model each blade as a rod connected to the fan axle at one end. When the fan is turned on, it takes 4.45 s for the fan to reach its final angular speed of 2.3 rev/s. What torque was applied to ...
*August 2, 2011*

**physics**

Martin caught a fish and wanted to know how much it weighed, but he didn't have a scale. He did, however, have a stopwatch, a spring, and a 5.50 N weight. He attached the weight to the spring and found that the spring would oscillate 20 times in 64 s. Next he hung the fish...
*August 1, 2011*

**physics**

A car moving at 35 mi/h is stopped by jamming on the brakes and locking the wheels. The car skids 53 ft before coming to rest. How far would the car skid if it were initially moving at 56 mi/h?
*August 1, 2011*

**Math**

Bryan and Kim are painting a house. Working together they can paint a house in three-fifths the time it takes Kim to paint the house working alone. Bryan takes 15 hours to paint the house alone. How long does it take Kim to paint the house working alone?
*August 1, 2011*

**Math / Linear Equations**

I was looking on a website that teaches linear algebra and it had this problem: 3x - 15 _______ =0 2x + 1 And it says the answer is: x = 5 But I don't understand how to get that answer so I hope someone can give me step by step directions for it.
*July 30, 2011*

**math**

Solve: x(x-3)=x-9 Is this correct? Thanks x^2 - 3x = x - 9 x^2 - 3x -x = 9 x^2 - 4x - 9 = 0
*July 28, 2011*

**math**

2a^2+3=7a 2a^2-7a+3=0 2a-1)*(a-3)=0 2a-1=0 or a-3=0 a=1/2 or a=3
*July 28, 2011*

**math**

solve by factoring 2a^2+3=7a Thanks
*July 28, 2011*

**math**

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2
*July 27, 2011*

**MATH!**

is this correct? Completely factor the following expression: 64y^2-49z^2 Is the answer: 128 y-49
*July 27, 2011*

**Can someone help me with this one Please! :)**

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2
*July 27, 2011*

**Is this correct?**

is this correct? Completely factor the following expression: 64y^2-49z^2 Is the answer: 128 y-49
*July 27, 2011*

**Algebra**

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2
*July 26, 2011*

**math**

Interval notation is a method of writing down a set of numbers. Usually, this is used to describe a certain span or group of spans of numbers along a axis, such as an x-axis. However, this notation can be used to describe any group of numbers. For example, consider the set of ...
*July 26, 2011*

**math**

is this correct? Completely factor the following expression: 64y^2-49z^2 Is the answer: 128 y-49
*July 26, 2011*

**Pre cal**

)a function f is defined as f(x) = 3*2^x describe the end behavior of f, please describe in detail how you got the answer and explain your abbreviations.
*July 25, 2011*

**Pre Cal**

ok, thats wahat i thought but wasn't sure.
*July 25, 2011*

**Pre Cal**

what is the big +x? and so the answer is "so for big +x the function looks like just plain old x, a straight line of slope +1" and "then the numerator is positive x^2 and the denominator looks like x so the result is again looks like x, that same straight line ...
*July 25, 2011*

**Pre Cal**

what does it mean when it says describe the end behavior of f and whats that for f(x)=(x^2+x+3)/(x-1) and f(x)= 3*2^x, please explain everything, and if you use --> tell me what that means, cuz i have no clue
*July 25, 2011*

**Math**

what does ---> +or - infinity mean? and what that for f(x)=(x^2+x+3)/(x-1) and f(x)= 3*2^x
*July 25, 2011*

**Math**

what does it mean to describe the end behavior of f in a graph?
*July 25, 2011*

**Pr-Cal/Trig**

Thanks
*July 25, 2011*

**Pr-Cal/Trig**

1)if the graph of f(x)=cotx is transformed by a horizontal shrink of 1/4 and a horizontal shift left pi, the result is the graph of: a) g(x)= cot[1/4(x-pi)] b) g(x)=cot[1/4(x+pi)] c) g(x)=cot[4(x-pi)] d) g(x)=cot[4(x+pi)] e) g(x)=cot[4x+pi] please include how you got the answer
*July 25, 2011*

**Pre Cal**

If the graph of f(x)=cotx is transformed by a horizontal shrink of 1/4 and a horizontal shift left pi, the result has what equation?
*July 25, 2011*

**Pre Cal**

please explain your b and a.
*July 25, 2011*

**Pre Cal**

a Function f is defined as f(x)=3*2^x a)is f increasing or decreasing? b)write equation for the horizontal asymptote c)describe the end behavior of
*July 25, 2011*

**Pre Cal**

why and how do you know
*July 25, 2011*

**Pre Cal**

Which of the following represents the graph of y=f(x) first shifted down 1 and reflected in the x-axis? a) y=f(-x)-1 b)y=-(f(x)-1) C)y=-f(x)-1 d) y=abs(f(x-1))
*July 25, 2011*

**Math**

subsitute you x in the f(x) equation for what g(x) equals. f(g(x))= 5(x^2+3) +2 =5x^2+15+2 =5x^2+17
*July 25, 2011*

**Pre Cal**

If the graph of f(x)=cotx is transformed by a horizontal shrink of 1/4 and a horizontal shift left pi, the result is what?
*July 25, 2011*

**Pre Cal**

a Function f is defined as f(x)=3*2^x a)is f increasing or decreasing? b)write equation for the horizontal asymptote c)describe the end behavior of f
*July 25, 2011*

**Pre Cal**

Which of the following represents the graph of y=f(x) first shifted down 1 and reflected in the x-axis? a) y=f(-x)-1 b)y=-(f(x)-1) C)y=-f(x)-1 d) y=abs(f(x-1))
*July 25, 2011*

**Pre Cal**

which of the following best describes the behavior of thre function f(x)=(x^2-2x)/(x^2-4) at the values not in its domain? a) one vertical asymptote, no removable discontinuities b) 2 vertical asymptotes c) two removable discontinuities d) one removable discontinuity, one ...
*July 24, 2011*

**math**

a 6' person is standing x feet away form a 10' lamppost. what is the distance d from the base of the lamppost to the end of the person's shadow, expressed as a function of x
*July 24, 2011*

**Pre Cal**

simplify the quotient: [x(5x+1)-3(x^2+1)]/ [(x-1)^2]
*July 24, 2011*

**Pre Cal**

a piece of wire 5 inches long is to be cut into two pieces. One piece is x inches long and is to be bent into the shape of a square. the other piece is to be bent into the shape of a circle. Find an expression for the total area made up by the square and the circle as a ...
*July 24, 2011*

**Pre Cal**

find the surface area of a box of hieght h whose base dimensions are p and q, and that satisfies either one of the following conditions: a) the box is closed. b) the box has an open top. c) the box has an open top and a square base.
*July 24, 2011*

**Pre Cal**

a function f is defined as f(x)= square root of (x+4). a) identify the domain of the function b) identify the range of the function c)Compute the intercept d) compute the x intercept E) sketch a graph of the function
*July 24, 2011*

**Pre Cal**

a 6 foot person is standing x feet away form a 10 foot lamppost. What is the distance d from the base of the lamppost to the end of the persons shadow, espressed as a function of x.
*July 24, 2011*

**english**

can you check to see if i identified the verbs correctly and used the correct tense. 1. For as long as I can remember, education has been a constant factor in my life. ( present progressive) 2. I received my first academic award in elementary school and it changed my whole ...
*July 22, 2011*

**business**

Discuss the pros and cons of the following statement: "Egalitarian companies are more innovative".
*July 19, 2011*

**Chemistry**

A line in the Lyman series of the hydrogen atom emission results from the transition of an electron from the n=3 level to the ground state level. a) What n level (#) is the ground state level for the hydrogen atom? b) What is the energy of this photon in Joules? c) What is the...
*July 18, 2011*

**Chemistry**

I don't understand this problem at all, I'm very confused, help would be greatly appreciated
*July 17, 2011*

**Chemistry**

c) What is the frequency (in Hz) and wavelength (in nm) of the emitted photon?
*July 17, 2011*

**Chemistry**

A line in the Lyman series of the hydrogen atom emission results from the transition of an electron from the n=3 level to the ground state level. a) What n level (#) is the ground state level for the hydrogen atom? b) What is the energy of this photon in Joules?
*July 17, 2011*

**Stats**

What z-score corresponds to a raw score of 68.7 when mean=60 and sd=4.3
*July 17, 2011*

**math**

(4y^3 − 5)^2 [4.6] Multiply.. Thanks :)
*July 17, 2011*

**chemistry**

How many grams of CuCl2 are required to make 75 mLof a 0.20M solution?
*July 15, 2011*

**chemistry**

What volume of 0.25M solution can be made from5.0 gof KCl?
*July 15, 2011*

**chemistry**

How many grams of KMnO4 should be used to prepare 2.00 L of a 0.500M solution?
*July 15, 2011*

**math**

Thank you
*July 15, 2011*

**math**

List the terms, coefficients, and degree of the following polynomial: 7x^4 – 3x^2 + 5x + 2/3 Can someone help me with this please. Thank You! :)
*July 15, 2011*

**biology**

Mitochondria vs Chloroplast The major difference between mitochondria and chloroplast is that the latter contains thylakoid membranes and pigment molecules, whereas the mitochondria membranes contain respiratory enzymes not found in chloroplast membranes. Chloroplasts ...
*July 15, 2011*

**Confidentiality of Health Information**

your medical records are private. but it depends on the 3rd parties requestiing the info for it to be made available to them. next time you visit the hospital save the medical records privacy act. almost any medical facility you go now will provide the info to you. someone ...
*July 14, 2011*

**Algebra**

Construct a truth table for (p ^ ~q) <-->q ^ is meant to be a conjunction symbol
*July 14, 2011*

**Algebra**

Construct a truth table for ~q v ~p. I am really lost here.
*July 14, 2011*

**Algebra**

Translate the following statement into English (~r v q)-> ~p The v in the center is for "disjunction" and "or" and that is an arrow meaning "if-then" after the parentheses. p=Jamie is on the train q=Sylvia is at the park r=Nigel is in the car
*July 14, 2011*

**Math**

Can someone help me with this one problem Please! :) Add: (-1/3x^2-1/4x+3/4)+(1/2x^2-1/4x-1/2)
*July 12, 2011*

**math**

List the coefficients of the given polynomial: -x3 – 4x2 + 3x – 6 My answer was going to be: -1, -4, 3, -6
*July 12, 2011*

**Math**

I completely agree with you. I am a visual learner and this book is so hard for me to understand it isn't even funny. I am so stressed out and i thank you for your help really.
*July 10, 2011*

**Math**

Simplify the following expression, and rewrite it in an equivalent form with positive exponents. 24x^3y^-3/72x^-5y^-1 My answer was going to be: 24/72*x^3/x^-5=y^=3/y^-1
*July 10, 2011*

**Math**

Thanks for your help. I wasn't even using the ^2 outside the parenthesis. Thank YOu! Ashley
*July 10, 2011*

**Math**

Raise the quantity in parentheses to the indicated exponent, and simplify the resulting expression. Express answers with positive exponents (-33xy^-1/66x^0y^-3)^2 This is the answer i am getting from TRYING to follow my online book. Please Help Me. Thank You! -33/66*x^-3/y^-1y...
*July 10, 2011*

**Math**

Simplify the following expression squareroot -14 squareroot -56 (My answer is going to be 7)
*July 10, 2011*

**Math ( Algebra)**

Short Answer: Raise the quantity in parentheses to the indicated exponent, and simplify the resulting expression. Express answers with positive exponents (-33xy^-1/66x^0y^-3)^2
*July 10, 2011*

**Math**

A sales representative must visit five cities. There are direct air connections between each of the cities. Use the multiplication rule of counting to determine the number of different choices the sales representative has for the order in which to visit the cities. ____choices
*July 7, 2011*

**Algebra 1 **

I have a problem that says: Combine these two statements into a single mathematical statement: x>2 and x<7. I'm not sure if I'm supposed to do this by graphing a number line or not, is there a way to do it without a number line?
*July 4, 2011*

**chemistry**

How many grams of Na2CO3 are required to completely react with 35.6mL of a 0.315M HCl solution? Na2O3(s) + 2HCl(aq) --> 2NaCl(aq( + CO2(g) + H2O(I)
*July 2, 2011*

**chemistry**

How many grams of Na2CO3 are required to completely react with 35.6mL of a 0.315M HCl solution? Na2O3(s) + 2HCl(aq) --> 2NaCl(aq( + CO2(g) + H2O(I)
*July 2, 2011*

**HS Science **

I have 4 questions 1 What is the equation for the acid ionization constant of HI? 2 Give the oxidation numbers of all atoms in NaMnO4 3 An atom changes its oxidation number from -2 to -5. Is it oxidized or reduced? How many electrons did it take to do this? 4 An atom changes ...
*June 30, 2011*

**biochemistry**

Why do you think the proximal and distal histidines are invariant between myoglobin, the alpha subunit and the beta subunit?
*June 30, 2011*

**statistics**

Thank you sooo much!! Also thanks for posting steps and not just an answer.
*June 30, 2011*

**statistics**

The proportion of baby boys born in the United States has historically been 0.512. You choose an SRS of 55 newborn babies and find that 47% are boys. Do ALL calculations to 5 decimal places before rounding. (d) In a random sample of 55 newborn babies, what is the probability ...
*June 30, 2011*

**calculus**

I see that someone else on here had the same problem, I wanted to find the solutions for 5xe^x+1 but its not really an equation.
*June 28, 2011*

**calculus**

If |2x - 1 | > 3 , then which of the following could not be a value of x?
*June 27, 2011*

**Physics**

A 36 kg box hangs from a rope. What is the tension in the rope if the following are true? (a) The box moves up a steady 5.0 m/s? (b) The box has vy = 5.0 m/s and is slowing down up at 5.0 m/s2?
*June 21, 2011*

**Chemistry**

Calculate the amount of energy required for the formation of one mole of MgSe bonds (not lattice energy). The radius of the magnesium ion is 0.65 A, and the radius of the selenide ion is 1.98 A. Note that 1 A=10^-10m.
*June 17, 2011*

**Chemistry**

Calculate the amount of energy required for the formation of one mole of MgSe bonds (not lattice energy). The radius of the magnesium ion is 0.65 A, and the radius of the selenide ion is 1.98 A. Note that 1 A=10^-10m.
*June 17, 2011*

**Math**

A ball is thrown with an initial velocity of 10 m/s from a height of 2 meters. At what time does the ball hit the ground?
*June 17, 2011*

**physics **

A car goes at a constant velocity of 15 m/sec for 4 seconds. How far does the car go in that time?
*June 16, 2011*

**Claflin**

A reflecting, spherical Christmas tree ornament has a diameter of 8.0 cm. A child looks at the ornament from a distance of 20 cm. Describe the image she sees. image location in centimeters.
*June 13, 2011*

**physics**

This refers to the shuttle orbir question: my response to answers posted: So would I take the answer from the formula for a circumference of a circle(24900.26337) and divide it by 17,265 to get 1.442239408(~1.44h)? How I got the circumference: 2 x pi x 3963=24900.26337
*June 12, 2011*

**physics**

I also tried 180mi/51.3(t)=3.50877193h. Then i took 80mi/that answer to get 22.8mph. Is that the right approach?
*June 11, 2011*

**physics**

Would the time southbound be if I were to half 5.46? Or, I looked it up that it would take about 1 h 30 min from austin to san antonio. I ended up taking 80mi/1.5h=53mph. If thats not a good way to go about it, how do I figure out the time southbound?
*June 11, 2011*

**physics**

A student wanted to drive from Austin to san Antonio ,80 mi south of Austin on highway I35. Unfortunately he entered in the wrong direction and drove to waco-100 miles north of Austin –before he noticed his error. In waco ,he turned around,drove back to Austin and ...
*June 11, 2011*

**physics**

I took 1.91m x 100cm and got 191cm and then divided it by .000000047s and got 4,063,829,787 cm/s. Is that just about correct?
*June 11, 2011*

**physics**

An electron travels 1.91 m in 4.72x10^-8s. How fast does it travel? Answer in cm/s
*June 11, 2011*

**physics**

I tried 1.44 h, but I got the answer wrong. Can you please tell me what I may be doing incorrectly with the significant figures? thanks
*June 11, 2011*

**physics**

So would I take the answer from the formula for a circumference of a circle(24900.26337) and divide it by 17,265 to get 1.442239408(~1.44h)? How I got the circumference: 2 x pi x 3963=24900.26337
*June 11, 2011*

**physics**

The average speed of an orbiting space shuttle is 20100 mi/h. The shuttle is orbiting about 196 mi above the Earth’s surface. Assume the Earth’s radius is 3963 mi. How long does it take to circle the Earth? Answer in units of h ( hours)
*June 11, 2011*

**physics**

Thanks! I have one more question: how did you get the .717m for the man?
*June 11, 2011*

**physics**

A man jogs at a spee of 1.1 m/s. His dog waits 1.6s and then takes off running at a speed of 3.8 m/s to catch up with the man. How far will they each have traveled when the dog catches up with the man?Answer in units of m
*June 11, 2011*

**physics**

Two ants race across a table 70 cm long. One travels at 5.7 cm/s and the other at 3.99999 cm/s. When the first one crosses the finish line,how far behind is the second one? Answer in units of cm
*June 11, 2011*

**physics**

I multiplied 68.1 X 5.099043638x10^14=3.472448717x10^16 to get the ocean area. Then to get the average depth i took 1.21mix1609m=1946.89. Then i multiplied the ocean area and volume i got to equal 6.760475683x10^19. To get the mass, I took that answer and multiplied it to 1000...
*June 11, 2011*

**physics**

Assuming that 68.1% of the Earth's surface is covered with water at average depth of 1.21 mi. ,estimate the mass of the water on Earth. One mile is 1.609 km and the radius of the earth is 6.37 x 10^6 m. Answer in units of kg
*June 11, 2011*

**Chemistry**

How many grams of Mg are needed to react completely with 3.80 L of a 2.50 M HF solution? Mg + 2HF MgF2 + H2
*June 9, 2011*

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