Saturday

February 13, 2016
Total # Posts: 988

**Chemistry**

You have the alkane C7H16. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.
*November 15, 2008*

**Chemistry**

You have the alkane C7H17. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.
*November 15, 2008*

**Chemistry**

You have the alkane C6H17. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.
*November 15, 2008*

**Chemistry**

Two people were given 1.75 g salicylic acid and 2.00 mL of acetic anhydride. If the density of acetic anhydride is 1.0820 g/mL, how many grams of aspirin could they have prepared. Is the answer 4.7 g
*November 14, 2008*

**Calculus**

What is the local linearization of e^x^2 near x=1? Is the answer 1+2x
*November 14, 2008*

**Calculus**

A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another mile, it is going 80 mph, and the plane has traveled another 5 miles and is going 500 ...
*November 12, 2008*

**Calculus**

A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another 5 miles and is going 500 mph. At that moment, how fast is the distance between the ...
*November 11, 2008*

**Hard Calculus**

Is the answer then -4 x 10^-13
*November 9, 2008*

**Hard Calculus**

The gravitational force, F, on a rocket at a distance, r, from the center of the earth is given by F=k/r^2 where k = 10^13 newton • km2. When the rocket is 10^4 km from the center of the earth, it is moving away at 0.2 km/sec. How fast is the gravitational force changing ...
*November 9, 2008*

**Hard Calculus**

Is the answer for part B -1C
*November 9, 2008*

**Hard Calculus**

A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase as the dose ...
*November 9, 2008*

**Math Word Problem**

At 6am a few bacteria fall into a can of syrup in a broken garbage bag. The conditions of warmth, moisture, and food are perfect for growth and the population doubles every 20 minutes. By 6pm the bacteria are overcrowded and dry and their food is gone.At what time does the ...
*November 9, 2008*

**Calculus**

The gravitational force, F, on a rocket at a distance, r, from the center of the earth is given by F=k/r^2 where k = 10^13 newton • km2. When the rocket is 10^4 km from the center of the earth, it is moving away at 0.2 km/sec. How fast is the gravitational force changing ...
*November 9, 2008*

**Calculus**

A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase as the dose ...
*November 9, 2008*

**Calculus**

(A) Find the equations of the tangent lines to the circle x^2 +y^2=25 at the points where x=4. (B) Find the equations of the normal lines to this circle at the same points. (The normal line is perpendicular to the tangent line at that point.) (C) At what point do the two ...
*November 7, 2008*

**Calculus**

(a) Find dy/dx given that x^2+y^2-4x+7y=15. (b) Under what conditions on x and/or y is the tangent line to this curve horizontal? Vertical? For part A, I simplifid it to -(2x+4/2y+7) For part B,I am confused on what to do?
*November 7, 2008*

**Implicit Functions**

Find the slope of the tangent to the curve at the point specified. x^3+5x^2y+2y^2=4y+11 at (1,2) So far I simplified it to -(3x^2-10y/5x^2+4y-4) which I think then simplifies to -(8/3). What do I do from here....?
*November 7, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

Find dy/dx of the function 10x^2+4y^2=sqrt(7). Is the answer 20x+8y=0
*November 5, 2008*

**Derivatives**

Find dy/dx for the function, xy-x-12y-3=0. Is the answer -14,I got this from 1-1-12=0, which solves to -14.
*November 5, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

(a) Find the tangent line approximation for sqrt(9+x) near x=0. (b)Find a formula for the error, E(x),in the tangent line approximation found in part (a). For part A, is the answer y=3. For part b, I don't understand , any help would be greatly appreciated.
*November 5, 2008*

**Calculus**

Find the derivative of 10x^2+4y^2=sqrt(7). Is the answer 20x+8y=0
*November 5, 2008*

**Calculus**

Find the derivative of the function, xy-x-12y-3=0. Is the answer -14,I got this from 1-1-12=0, which solves to -14.
*November 5, 2008*

**Calculus**

According to the US Census, the world population P, in billions, is approximately P=6.342e^(0.011t); where t is in years since January 1, 2004. At what rate was the world's population increasing on January 1, 2005? Give your answer in millions per year. Is the answer 6412 ...
*November 5, 2008*

**Engineering/Algebra**

A cardboard tube has a failure stress of 4,960,000 N/m^2 and an axial stress of 75 N/cm^2, find the factor of safety of the tube. Is the answer 66133.33
*November 4, 2008*

**Engineering/Algebra**

A cardboard tube is loaded with a 15.3 N axial load. The tube has an outside diameter of 2.5 cm and a wall thickness of .035 cm. Find the axial stress in the cardboard tube. Is the answer 75 N/cm^2? If so can you show me your way of getting to this answer.
*November 4, 2008*

**Engineering/Algebra**

A balsa wood glider wing has the following properties during flight: Thickness= 0.3175 cm I= 0.0733 cm^4 Moment= 4.2 N-cm Find the bending stress in the wing. Express your answer in N/m^2. Is the answer either 9.096 N/m^2 or 18.192 N/m^2
*November 4, 2008*

**Engineering/ Algebra**

A balsa wood glider wing has the following properties during flight: Thickness= 0.3175 cm I= 0.0733 cm^4 Moment= 4.2 N-cm Find the bending stress in the wing. Express your answer in N/m^2. Is the answer either 9.096 N/m^2 or 18.192 N/m^2
*November 4, 2008*

**Engineering/ Algebra**

A balsa wood glider wing has the following properties during flight: Thickness = 0.3175 cm I = 0.0733 cm^4 Moment = 4.2 N-cm Find the bending stress in the wing. Express your answer in N/m^2. Is the answer 9.09 N/m^2 or 18.19 N/m^2
*November 4, 2008*

**math**

what percent is 23 students out of 51 students and how do you solve it
*October 30, 2008*

**Algebra**

keep it clean here.
*October 29, 2008*

**Calculus**

Explain the global optimization process for a continuous function over a closed interval. Be sure to identify all steps involved and clearly explain how the derivative is utilized in this process. Would this be a good explanation? The process of global optimization refers to ...
*October 27, 2008*

**Calculus**

Explain the global optimization process for a continuous function over a closed interval. Be sure to identify all steps involved and clearly explain how the derivative is utilized in this process. Does this have to do with the first derivative rule or second derivative rule ...
*October 27, 2008*

**Calculus**

A rectangular beam is cut from a cylindrical log of radius 30 cm. The strength of a beam of width w and height h is proportional to wh^2. Find the width and height of the beam of maximum strength. Is the width 45 and the height 20.
*October 26, 2008*

**Calculus**

A rectangular swimming pool is to be built with an area of 1800 square feet. The owner wants 5-foot wide decks along either side and 10-foot wide decks at the two ends. Find the dimensions of the smallest piece of property on which the pool can be built satisfying these ...
*October 25, 2008*

**Calculus**

Explain the global optimization process for a continuous function over a closed interval. Be sure to identify all steps involved and clearly explain how the derivative is utilized in this process. Does this have to do with the first derivative rule or second derivative rule ...
*October 25, 2008*

**Calculus (Global Max)**

Explain the global optimization process for a continuous function over a closed interval. Be sure to identify all steps involved and clearly explain how the derivative is utilized in this process. Does this have to do with the first derivative rule or second derivative rule ...
*October 25, 2008*

**Calculus**

The hypotenuse of a right triangle has one end at the origin and one end on the curve y=x^(7)e^(-7x) , with x greater than or equal to 0. One of the other two sides is on the x-axis, the other side is parallel to the y-axis. Find the maximum area of such a triangle. Round your...
*October 21, 2008*

**Calculus**

Find a forula for the following function. A line with slope 5 and x-intercept 10 is the answer y(x)= 5x-50
*October 16, 2008*

**Calculus**

Find a formula for the following function. A parabola opening downward with its vertex at (6,1) and y -intercept equal to -35. (y-1)^2=4(-35)(x-6) Please help
*October 16, 2008*

**Algebra**

Find a forula for the following function. A line with slope 5 and x-intercept 10 is the answer y(x)= 5x-50
*October 16, 2008*

**Calculus**

Use analytical methods to find the exact global maximum and minimum values of the function f(x)=8x-ln(4x) for x >0. If a global maximum or minimum does not exist, enter the word NONE. For the global maximum at x=none, But for the Global minimum at x=? Is the Global minimum ...
*October 16, 2008*

**SCIENCE**

WATS THE REACTION BETWEEN IRON AND SULPER AND WATS THE ENERGY BETWEEN THEM
*October 9, 2008*

**math**

Is anyone familar with Sharon Wells Math? How do you solve a word problem using their program?
*October 6, 2008*

**Social Studies**

Rain can collect easily in a dried out waterbed called a _____________
*September 30, 2008*

**Calculus**

f(x)=x^3(x^(4)-8) Find f '(x) by multiplying out before taking the derivative Is the answer x^12+-8+x^12-8x^3 simplified to 2x^12-8x^3+-16
*September 30, 2008*

**Chemistry**

Alexander, who weighs 159lbs , decides to climb Mt. Krumpett, which is 5460ft high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100g bar contains 10g of fat, 40g of protein, and 50g of carbohydrates.Alexander wants to know ...
*September 29, 2008*

**Chemisrty**

I am getting 22.6, but it says that is the wrong answer. 450*2000*4.18=3762000 159*5460*9.8=8507772 I am setting them equal to eachother and getting 2.26, but it says the answer is wrong. Please help.
*September 29, 2008*

**Chemisrty**

Alexander, who weighs 159lbs , decides to climb Mt. Krumpett, which is 5460ft high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100g bar contains 10g of fat, 40g of protein, and 50g of carbohydrates.Alexander wants to know ...
*September 29, 2008*

**Chemistry**

Alexander, who weighs 159 , decides to climb Mt. Krumpett, which is 5460 high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100- bar contains 10 of fat, 40 of protein, and 50 of carbohydrates.Alexander wants to know exactly how...
*September 27, 2008*

**Chemisty**

Is it 450 calories I don't know what you mean by 2mgh
*September 27, 2008*

**Chemisty**

Alexander, who weighs 159 , decides to climb Mt. Krumpett, which is 5460 high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100- bar contains 10 of fat, 40 of protein, and 50 of carbohydrates.Alexander wants to know exactly how...
*September 27, 2008*

**Calculus**

Find the derivative. g(x)=cos(x^6) Isn't the answer -6xsin(x^6)
*September 27, 2008*

**Calculus**

Find the derivative of the given function w=((t^3)+8)^103 Isnt the answer 309t((t^3)+8)^102
*September 27, 2008*

**Chemistry**

If 560.70 g of water (22degrees) is displaced, what volume of gas displaced it? Any help would be greatly appreciated. I am thinking about using PV=NRT, but do I assume the value of the pressure is 1. Also using 560.7 do i determine the amount of moles?
*September 26, 2008*

**Chemistry**

A gaseous mixture of and contains 30.8 nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 505mmHG ? I am getting .41 * (505/750)= .27 .27 is my answer, is this right.
*September 26, 2008*

**Chemistry**

Which metal would you expect to generate more gas when exposed to a weakly acidic solution, K or Ca? I say K because it only needs to lose one electron. Is this true?
*September 24, 2008*

**Calculus**

At STP, 1.00 g of calcium is placed into an acidic solution, and 407 mL of hydrogen gas is collected. What is the ratio of moles of calcium consumed to moles of hydrogen produced? a)1.37:1.00 b)1.00:1.64 c)0.928:1.00 d) 0.500:1.00 Is the answer A, if so, can you explain the ...
*September 22, 2008*

**Chemistry**

Butane,C4H10 , is a component of natural gas that is used as fuel for cigarette lighters.At 1.00atm and 23 degrees Celsius , how many liters of carbon dioxide are formed by the combustion of 1.00 of butane? 2C4H10+13O2 yields 8CO2+10H2o Any help would be greatly appreciated
*September 21, 2008*

**Chemistry**

Butane, , is a component of natural gas that is used as fuel for cigarette lighters.At 1.00 and 23 , how many liters of carbon dioxide are formed by the combustion of 1.00 of butane? 2C4H10+13O2 yields 8CO2+10H2o
*September 21, 2008*

**Chemistry**

Imagine that you have a 7.00 gas tank and a 3.00 gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 145 , to what pressure should you fill the ...
*September 21, 2008*

**Calculus**

For each value of h, evaluate the following function. Round your answer to four decimal places. lim h->0 (4+h)^(3)-64/h A) h=0.01 B) h=0.001 C) h=0.0001 D) h=-0.01 E) h=-0.001 F) h=-0.0001 For A I got 48.9 For B I got 48.99 For C I got 48.999 For D I got 47.9 For E I got 47...
*September 21, 2008*

**Calculus**

For each value of h, evaluate the following function. Round your answer to four decimal places. lim h->0 (4+3)^(3)-64/h A) h=0.01 B) h=0.001 C) h=0.0001 D) h=-0.01 E) h=-0.001 F) h=-0.0001 For A I got 48.9 For B I got 48.99 For C I got 48.999 For D I got 47.9 For E I got ...
*September 21, 2008*

**Calculus**

I am given the function P=9e^(-0.9t) In the funcion form P=(P initial)(a^t) what are the values of P initial and a P initial is 9 what is a?
*September 21, 2008*

**CHemistry**

Butane, , is a component of natural gas that is used as fuel for cigarette lighters.At 1.00 and 23 , how many liters of carbon dioxide are formed by the combustion of 1.00 of butane?
*September 21, 2008*

**Chemistry**

When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas. How many grams of calcium carbonate are needed to produce 81.0 of carbon dioxide at STP? Is the asnwer 80.95
*September 21, 2008*

**Chemistry**

Imagine that you have a 7.00 gas tank and a 3.00 gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 145 , to what pressure should you fill the ...
*September 21, 2008*

**Chemistry**

If it takes three "breaths" to blow up a balloon to 1.2 , and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 balloon. Express your answer in moles using two significant figures Would the answer be 0.38 mol?
*September 18, 2008*

**Chemistry**

If it takes three "breaths" to blow up a balloon to 1.2 , and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 balloon. Express your answer in moles using two significant figures Would the answer be 0.38 mol?
*September 17, 2008*

**Calculus**

Find the volume of the solid generated by revolving the region enclosed in the triangle with vertices (4.6,4.6), (4.6,0), (6.7,4.6) about the x-axis.
*September 16, 2008*

**physics**

can someone help with the question below, it really give me a hard time "thought experiments" were to be conducted on moving trains or rocket ships. Answer following question: 1. What would the results of the free fall experimen be if you set the apparatus up and ...
*September 16, 2008*

**7th grade**

is a pea a fleshy or dry fruit
*September 14, 2008*

**Calculus**

Find a formula for the derivatives of the function m(x)=1/(x+1) IS the answer -1/(x+h)(x+h+1)
*September 13, 2008*

**Calculus**

Use algebra to evaluate the limit of lim h->0 (2-h)^(3)-8/h. Is the answer -12
*September 12, 2008*

**Calculus**

Use algebra to evaluate the limit of lim h->0 (2-h)^3-8/h. Is the answer -12
*September 12, 2008*

**Calculus**

Use algebra to evaluate the limit of lim h->0 (2-h)^3-8/h. Is the answer -12
*September 12, 2008*

**Calculus**

Find a formula for the derivatives of the function m(x)=1/(x+1) Please help.....Any assistance would be greatly appreciated.
*September 12, 2008*

**math**

what is this word unscrambled cryhootiamxtmoi
*September 12, 2008*

**Calculus**

Let a=8, f(x)=|x-8|/x You are given lim x->a- f(x)=lim x->8- |x-8|/x Is the limit of the value 0.
*September 11, 2008*

**Calculus**

Let a=8, f(x)=|x-8|/x You are given lim x->a+ f(x)=lim x->8+ |x-8|/x Is the limit of the value 0.
*September 11, 2008*

**Calculus**

Let a=8, f(x)=|x-8|/x Is the value of the limit 0.
*September 11, 2008*

**Calculus**

consider k(t)=(e^t)/(e^t-7) on[-7,7] Is this function continuous on the given interval? If it is continuous, type "continuous". If not, give the t -value where the function is not continuous. The function is not continous and it is not continous on 7 (which is the t=...
*September 11, 2008*

**Calculus**

For f(x)=(3x^2-5x+2)/(2x^2-6) complete the statements. f(x)->_________ as x->-infinity f(x)->_________ as x->infinity In the blanks, I say for the first one infinity then -infinity for the second one.
*September 11, 2008*

**Calculus**

COnsider g(x)=(8)/(x-6) on (6,13) (a) Is this function continuous on the given interval? If it is continuous, type "continuous". If not, give the x -value where the function is not continuous. Is is continous? If not? what interval then?
*September 11, 2008*

**Calculus**

consider k(t)=(e^t)/(e^t-7) on[-7,7] Is this function continuous on the given interval? If it is continuous, type "continuous". If not, give the t -value where the function is not continuous. Is the t value 0
*September 11, 2008*

**Calculus**

consider k(t)=(e^t)/(e^t-7) on[-7,7] Is this function continuous on the given interval? If it is continuous, type "continuous". If not, give the t -value where the function is not continuous. I say continous, am I wrong? If I am wrong what interval is it on?
*September 11, 2008*

**Calculus**

COnsider g(x)=(8)/(x-6) on (6,13) (a) Is this function continuous on the given interval? If it is continuous, type "continuous". If not, give the x -value where the function is not continuous. Is is continous? If not? what interval then?
*September 11, 2008*

**Calculus**

Is this function continuous on the given interval? 7x+(x^2/3) on[-5,5] I say no, because it is undefined at some value in the interval.
*September 10, 2008*

**Calculus**

COnsider g(x)=(8)/(x-6) on (6,13) (a) Is this function continuous on the given interval? If it is continuous, type "continuous". If not, give the x -value where the function is not continuous. Is is continous? If not? what interval then?
*September 10, 2008*

**Calculus**

consider k(t)=(e^t)/(e^t-7) on[-7,7] Is this function continuous on the given interval? If it is continuous, type "continuous". If not, give the t -value where the function is not continuous. I say continous, am I wrong? If I am wrong what interval is it on?
*September 10, 2008*

**algebra**

When solving for the roots of a quadratic equation, three (3) possibilities may arise what are these three possible cases? What do each of these cases mean?
*September 10, 2008*

**Calculus**

Consider the function f(x)=sin(1/x) Find a sequence of x-values that approach 0 such that (1) sin (1/x)=0 {Hint: Use the fact that sin(pi) = sin(2pi)=sin(3pi)=...=sin(npi)=0} (2) sin (1/x)=1 {Hint: Use the fact that sin(npi)/2)=1 if n= 1,5,9...} (3) sin (1/x)=-1 (4) Explain ...
*September 9, 2008*

**Calculus**

Consider the function f(x)=sin(1/x) Find a sequence of x-values that approach 0 such that (1) sin (1/x)=0 {Hint: Use the fact that sin(pi) = sin(2pi)=sin(3pi)=...=sin(npi)=0} (2) sin (1/x)=1 {Hint: Use the fact that sin(npi)/2)=1 if n= 1,5,9...} (3) sin (1/x)=-1 (4) Explain ...
*September 9, 2008*

**Calculus**

Consider the function f(x)=sin(1/x) Find a sequence of x-values that approach 0 such that sin (1/x)=0 sin (1/x)=1 sin (1/x)=-1 Is sin sin (1/x)=0 and sin (1/x)=-1 does not exist. What is sin (1/x)=1 then.
*September 8, 2008*

**Calculus**

Consider the function f(x)=sin(1/x) Find a sequence of x-values that approach 0 such that sin (1/x)=0 sin (1/x)=1 sin (1/x)=-1 Is sin sin (1/x)=0 and sin (1/x)=-1 does not exist. What is sin (1/x)=1 then. How would I show the sequence of values, any help would be greatly ...
*September 8, 2008*

**Calculus**

Use algebraic manipulations to evaluate lim x->infinity for the function. f(x)=x^2+4/x+3 Is the answer 1 or interdemediate?
*September 8, 2008*

**Calculus**

Find a value of the constant k such that the limit exists. lim x->1 (x^2-kx+4)/(x-1) Is the answer 5?
*September 8, 2008*