Monday

March 2, 2015

March 2, 2015

Total # Posts: 78,348

**Please check my Calculus**

1. Find all points of inflection of the function f(x)=x^4+x^3 A. (0, 0) and (-½, -1/16) B. (-½, -1/16) C. (0, 0) D. (0, 0) and (-¾, -27/256) E. none of these I got A. I found the second derivative and solved for x and plugged in the values to find the ...
*January 12, 2015*

**chemistry exercises**

The concentrated H2SO4 of 155g dissolved in enough amount of water if acidic solution is 2.3L a) what is the mole of H2SO4 b) what is the concentration H2SO4 c) what is the concentration of H+(H3O+) created in the solution d) what is the PH value of solution e) what is the ...
*January 12, 2015*

**chemistry**

2) At 298K, what are the molarities of pure water?
*January 12, 2015*

**chemistry**

The concentrated H2SO4 of 155g dissolved in enough amount of water if acidic solution is 2.3L a) what is the mole of H2SO4 b) what is the concentration H2SO4 c) what is the concentration of H+(H3O+) created in the solution d) what is the PH value of solution e) what is the ...
*January 12, 2015*

**Please check my Calculus**

1. Find all points of inflection of the function f(x)=x^4-6x^3 A. (0, 0) B. (0, 0), (9/2, -2187/16) C. (3, -81) D. (0, 0), 3, -81) E. none of these I got D. I found the second derivative and solved for x and plugged values into original function to get points. 2. Find dy/dx ...
*January 12, 2015*

**Please check my Calculus**

That's a nasty one, all right. f"(x) = 12(240x^6-36x^4-178x^2+5)/(12x^4-2x^2+15)^3 so the numerator is a cubic in x^2, not easy to solve. Not sure why they threw this curve ball.
*January 12, 2015*

**Please check my Calculus**

When I solve 1 without a graphing utility I one get 2 inflection points. How do you get the other two without a graphing utility. Not allowed to use calculators for this.
*January 12, 2015*

**Please check my Calculus**

1. Find all points of inflection: f(x)=1/12x^4-2x^2+15 A. (2, 0) B. (2, 0), (-2, 0) C. (0, 15) D. (2, 25/3), (-2, 25/3) E. none of these I got D. I found the second derivative and equaled it to 0 and solved for x. I plugged the x values in to get my points. 2. Find the ...
*January 12, 2015*

**Please check my Calculus**

#1 ok #2 f' = -3x^2+36x-105 = -3(x^2-12x+35) = -3(x-5)(x-7) f'>0 on (5,7), so D is correct #3 y' = 1+sinx y'=0 only at x = 3pi/2, so (D) is correct
*January 12, 2015*

**Please check my Calculus**

1. Given f(x)=-6/x, choose the correct statement A. The graph of f is concave upward on the interval (negative infinity, 0) B. The graph of f is concave downward on the interval (negative infinity, 0) C. The graph of f is concave upward on the interval (negative infinity, ...
*January 12, 2015*

**Chemistry (Acid-Base)**

2) At 298K, what are the molarities of pure water?
*January 12, 2015*

**Please check my Calculus**

1. Find all critical values for f(x)=(9-x^2)^⅗ A. 0 B. 3 C. -3,3 D. -3, 0, 3 E. none of these I got D. I found the derivative and solved for critical numbers. 2. Find all intervals on which the graph of f(x)=(x-1)/(x+3) is concave upward A. (negative infinity, infinity) ...
*January 12, 2015*

**Please check my Caclulus**

1. Find all intervals on which the graph of y=(x^2+1)/x^2 is concave upward. A. (negative infinity, infinity) B. (negative infinity, -1) U (1, infinity) C. (negative infinity, 0) U (0, infinity) D. (1, infinity) E. none of these I got C. I found the second derivative and used ...
*January 12, 2015*

**Calculus**

Find the absolute maximum and absolute minimum of f on the interval (-4, -1]: f(x)=(x^3+8x^2+19x+12)/(x+4) A. Maximum: None; Minimum: (-2, -1) B. Maximum: (-4, 3); Minimum (-1, 0) C. Maximum: (-4, 3); Minimum: (-2, -1) D. Maximum: None; Minimum: (-1, 0) E. none of these
*January 11, 2015*

**Calculus**

Find the values of x that give relative extrema for the function f(x)=3x^5-5x^3 A. Relative maximum: x= 1; Relative minimum: x=sqrt(5/3) B. Relative maximum: x=-1; Relative minimum: x=1 C. Relative maxima: x=+or- 1; Relative minimum: x=0 D. Relative maximum: x=0; Relative ...
*January 11, 2015*

**chemistry college**

At a constant temperature of 20oC and the partial pressure of 760 mmHg, the solubility of CO2 in water is 0.169g per 100mL. If the partial pressure is changed to 43,000 mmHg, what is the solubility of CO2?
*January 11, 2015*

**Measurement**

Thanks.
*January 11, 2015*

**Mechanics**

When electrically testing a rotor with an ohmmeter, you should check for shorts, ground, and what?
*January 11, 2015*

**math**

It's B
*January 11, 2015*

**Patton Fuller**

Identify GAAP applied to the health care industry.
*January 11, 2015*

**Algebra 2**

Find the equation of the line that is perpendicular to y=5 and passes through the point (2,3).
*January 11, 2015*

**Legal research**

Which of the following legal publications is NOT typically updated with pocket parts? A) Legal encyclopedias B) Legal dictionaries C) Digests D) Treatises I believe it's D. But then again I thought it maybe C.
*January 11, 2015*

**Legal research**

The most familiar method of locating law review and legal periodicals is the __________ to Legal Periodicals and Books. A. Collection B. Compilation C. Index D. Digest Digest?
*January 11, 2015*

**chemistry**

if the average concentration of PCBs in the body tissue of a human is 4.0 ppm, what mass of the PCB is present in a 64 kg person? is this a significant amount in regards to the health of the person? What is the concentration of a solution of sodium nitrate that contains 35.0 g...
*January 11, 2015*

**chemistry**

if the average concentration of PCBs in the body tissue of a human is 4.0 ppm, what mass of the PCB is present in a 64 kg person? is this a significant amount in regards to the health of the person? What is the concentration of a solution of sodium nitrate that contains 35.0 g...
*January 11, 2015*

**Legal research**

The LexisNexis case abbreviation is: A. LN. B. LX. C. LE. D. LEX. is it A?
*January 11, 2015*

**Writing/English**

What are some tips on writing in an embarrassed tone?
*January 11, 2015*

**Chemistry**

144
*January 11, 2015*

**Chemistry**

How many mL of 0.5 M HCl(aq) are needed to neutralize a 288 mL solution of 0.25 M NaOH?
*January 11, 2015*

**Calculus**

Use the graph of f(x)=x^2/(x^2-4) to determine on which of the following intervals Rolle’s Theorem applies. A. [0, 3] B. [-3, 3] C. [-3/2, 3/2] D. [-2, 2] E. none of these I know what the Rolle's Theorem is but I'm unsure on how you know if the function is ...
*January 11, 2015*

**Calculus**

Let f(x) be a polynomial function such that f(4)=-1, f’(4)=2 and f”(4)=0. If x<4, then f”(x)<0 and if x>4, then f”(x)>0. The point (-4, -1) is which of the following for the graph of f? A. relative maximum B. relative minimum C. critical value D...
*January 11, 2015*

**Spanish**

Explain El Zócalo and its importance.
*January 11, 2015*

**Calculus**

Let f(x) be a polynomial function such that f(-2)=5, f’(-2)=0 and f”(-2)=3. The point (-2, 5) is which of the following for the graph of f? A. relative maximum B. relative minimum C. intercept D. inflection point E. none of these
*January 11, 2015*

**Calculus**

How do I solve it analytically? I'm still confused.
*January 11, 2015*

**Calculus**

Which statement is NOT true of the graph f(x)=(x+1)(x-3)^2? A. f has a relative maximum at (⅓, 256/27) B. f has a point of inflection at (3, 0) C. f has an intercept at (3, 0) D. f has a relative minimum at (3, 0) E. none of these For f'(x) I got 3x^2-10x+3 For f&...
*January 11, 2015*

**Calculus**

Consider f(x)=x^2/(x^2+a), a>0. Determine the effect on the graph of f if a is varied. A. Each y value is multiplied by a B. As a increases, the vertical tangent lines move further from the origin C. The graph of the curve is shifted sqrt(a) units to the left. D. As a ...
*January 11, 2015*

**Calculus**

I think I got it. Is it B?
*January 11, 2015*

**Calculus**

Given f(x) = -1/x, find all c in the interval [-3, -½] that satisfies the Mean Value Theorem. A. c= -sqrt(3/2) B. c= +or- sqrt(3/2) C. The Mean Value Theorem doesn’t apply because f is not continuous at x=0 D. The Mean Value Theorem doesn’t apply because f(-&...
*January 11, 2015*

**Caluclus**

Find the absolute maximum and absolute minimum of f on the interval (-1,2]: f(x)=(-x^3+x^2+3x+1)/(x+1) A. Maximum: (1, -2); Minimum: (-1, 2) B. Maximum: (1, -2); Minimum: None C. Maximum: None; Minimum: None D. Maximum: None; Minimum: (-1, 2) E. None of these I got to my ...
*January 11, 2015*

**Calculus**

A particle is moving along the x-axis according to the position function s(t)=3t^2-t^3. What is its maximum velocity? A. 1 B. 2 C. 3 D. 4 E. none of these I thought velocity was the derivative but I'm not sure with this problem.
*January 11, 2015*

**Phycis**

Two kids of mass 10 kg and 15 kg are trying to balance a see saw of total length 6 metres with fulcrum at the centre if one of the kid is sitting aat on end the distance of other from the centre in metres is
*January 11, 2015*

**Calculus**

Find all points of extrema on the interval [0, 2pi] if y=x+sinx (-1.-1+(3pi/2)) (pi, pi) (-1,0) ((3pi/2), 0) none of these I got pi as my critical number but I'm confused with the intervals.
*January 11, 2015*

**Calculus**

Find dy/dx for 5x^2-2xy+7y^2=0 I'm getting confused with signs.
*January 11, 2015*

**Maths **

If you roll a dice 18 times how many 4's would you be expected to get?
*January 10, 2015*

**language arts**

The correct answer for the question is B & D.
*January 10, 2015*

**Biology**

How do rocks store oxygen, and how did they come to store them?
*January 10, 2015*

**ratio **

Jake sold 36 tickets to the school fair, and Jeanne sold 15 tickets. What is the ratio, in simplest form, of the number of tickets Jeanne sold to the number of tickets Jake sold ?
*January 10, 2015*

**ratios**

Write three ratios equal to 7/2
*January 10, 2015*

**ratio **

Write a ratio for the situation in three ways comparing the first quantity to the second quantity A zoo has 14 monkeys and 18 chimpanzees
*January 10, 2015*

**maths**

24 out of 60 pupils lik red. What angel would be used for red on a pie chart?
*January 10, 2015*

**maths**

Work out: 2^3 + root 49
*January 10, 2015*

**Physics**

A bath toy is floating stationary in water such that half of the toy is above water and half of the toy is below the water. A kid pulls the toy 3.9 cm down into the water and then lets go. The toy then proceeds to bob up and down. It bobs up and down 26 times in a minute. NOTE...
*January 10, 2015*

**Chemistry.**

you want a mole ratio. Take the smallest number, .0045, divide it into each of the other moles... O 1 C 2 H 4 C2H4O is the empirical formula, and I would even on this guess structure as CH3OH
*January 10, 2015*

**chemistry**

this is what I have is it good: this is the question: Explain how one of the major concepts learned in CHM 111 applies to everyday life. One major concept that was learned in CHM 111 that applies to everyday life is stoichiometry. Stoichiometry is founded on the law of ...
*January 10, 2015*

**chemistry**

stoichiometry how does it relate to real life?
*January 10, 2015*

**Physics and Maths**

A sphere of uniform density d1 has a radius R. It also consists of a hollow sphere of radius r. the sphere floats slightly on water of density d2. Find r.
*January 10, 2015*

**math **

What measures the spread of data?
*January 10, 2015*

**Maths **

A is due East of B. What is the bearing of B from A?
*January 10, 2015*

**Maths **

The probability of getting heads on a biased coin is 0.6. what is the probability of getting tails on this coin?
*January 10, 2015*

**statistic and probability**

There are two independent multiple-choice quizzes where quiz 1 has eight questions and quiz 2 has 15 questions. Each question in the first quiz has four choices and each question in the second quiz has five choices. Suppose a student answers the questions in the quizzes by ...
*January 10, 2015*

**statistik and probability**

Two samples of sizes 8 and 10 are drawn from two normally distributed populations having variances 21.8 and 36, respectively. Find the probability that the variance of the first sample is more than twice the variance of the second sample. Interpret its value.
*January 10, 2015*

**Eng225 introduction to film **

Which of the following is generally true of the role of actors in movies
*January 9, 2015*

**Chemistry**

Answer contains three significant figures. Molarity=moles/Volume (L) Calculate moles of CaCl2, followed by moles of Cl2: [19.6g*(1 mole/110.984g)]=-moles of CaCl2 moles of CaCl2*(2 moles of Cl/1 moles of CaCl2)= moles of Cl moles of Cl/0.500L= molarity of Cl
*January 9, 2015*

**History help!!!**

Thanks! can you delete this post?
*January 9, 2015*

**History help!!!**

What are the benefits of drilling for crude oil, or petroleum, in the US and Canada?
*January 9, 2015*

**Math**

You want to make an investment in a continuously-compounding account over a period of three years. What interest rate is required for your investment to double in that time period? Round the logarithm value and the answer to the nearest tenth. is it 2.3
*January 9, 2015*

**Quick english help**

Is it necessary to capitalize colleagues in a sentence?
*January 9, 2015*

**Math**

Which of the following is another representation of the polar coordinate -9, -90 degrees? Is it 9,270 degrees
*January 9, 2015*

**science**

are these right plz tell me
*January 9, 2015*

**Math**

Find the quotient of the following expression: 7(cos 5pi/6 +isin 5pi/6) / -2(cos pi/2 +isin pi/2) I got -7/4+ 7 square root 3/4 i. Is this correct?
*January 9, 2015*

**LA - 1 question**

B is the correct answer
*January 9, 2015*

**Math**

Express -5(cos pi/2 +isin pi/2) in rectangular form. I got -5i. Is this correct?
*January 9, 2015*

**Math**

Find the following product -5(cos pi/3 +isinpi/3)*2(cos pi/6+ isin pi/6' I got 10i. is this correct?
*January 9, 2015*

**English **

If you are said to have blank, then you are full of energy, or the breath of life. What is the blank?
*January 9, 2015*

**physics**

weight of a person in newton on mars who weigh 882N on earth ( g = 9.8m/s^2). weight of person on earth who weighs 333N on mars.
*January 9, 2015*

**physics**

weight of a person in newton on mars who weigh 882N on earth ( g = 9.8m/s^2)
*January 9, 2015*

**physics**

A vertically hanging bungee cord has a length of 6 m and k = 50N/m. What is the new length of the bungee if a student of mass 40 kg is suspended from the lower end?
*January 8, 2015*

**psychics**

physics sorry
*January 8, 2015*

**6TH GRADE MATH**

y=11+(15/3) Y=11+5 Y=16
*January 8, 2015*

**Math**

How to simplify e^27x?
*January 8, 2015*

**math**

The perimeter of a sheet of paper is 38 cm. If the width is 8 cm what is the length of the paper? P = 2L + 2W 38 = 2L + 2(8) 38 = 2L + 16 22 = 2L 11 = L is 11 the answer
*January 8, 2015*

**English (Dracula)**

its fine i will ask my teacher
*January 8, 2015*

**English (Dracula)**

yes, but it doesnt explain his history in the first few chapters
*January 8, 2015*

**English (Dracula)**

i know the answers to the last two questions. But i cant find anything about his history in the first few chapters
*January 8, 2015*

**Pre-Calc/Trig**

yes, thanks i can :)
*January 8, 2015*

**Pre-Calc/Trig**

Complete the following for each system that involves one or more quadratic equations: Solve the system algebraically 7y^2-5x^2+20x=3 5x^2+21y^2=209
*January 8, 2015*

**math**

(√3x-3)-(√x-3)=√x
*January 8, 2015*

**physics**

An MRT Train accelerates at a rate of 2.75 m/s^2 from rest for 3.00 seconds.How fast will the train be moving after that time?
*January 8, 2015*

**Physics and Math**

The answer is the spring is depressed by 1.6m
*January 8, 2015*

**Physics and Math**

The spring is depressed by how much? The answer is 1.6m. But how?
*January 8, 2015*

**Physics and Math**

A small ball with a mass of 1 kg rolls down a long frictionless inclined ramp, which is at an angle 3o Degree above the horizon. A linear spring, whose length is not negligible, is attached to the bottom of the ramp. The ball is released from a distance of 1 m above the spring...
*January 8, 2015*

**Algebra**

1/(x-5) = 7/2x x = 7?
*January 8, 2015*

**Algebra**

Does x(x-7) = 0 have two solutions, 0 and 7?
*January 8, 2015*

**Algebra**

1/8 + 2/t = 17/8t Is t = 1 the only solution?
*January 8, 2015*

**ELA**

I'd go with B. From the passage, it does not seem like the Jews thought they would stay forever in the ghetto.
*January 7, 2015*

**Chem-Stoich**

Thanks, this helped me figure out what I needed to do, I got 0.25% CaCl2
*January 7, 2015*

**math**

The perimeter of a sheet of paper is 38 cm. If the width is 8 cm what is the length of the paper?
*January 7, 2015*

**sixth grade math**

Cfkjfjghthcbbn
*January 7, 2015*

**Physical Science**

0.04 m/s
*January 7, 2015*

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