Wednesday

January 18, 2017
Total # Posts: 1,734

**math**

Let α and β be the roots of 3x2+4x+9=0. Then (1+α)(1+β) can be expressed in the form ab, where a and b are coprime positive integers. Find a+b.

*June 18, 2013*

**physics**

Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is unable to catch the ball anymore since the ...

*June 18, 2013*

**physics**

In a synchrotron, electrons are accelerated to speeds close to the speed of light v≈c≈3×108 m/s Suppose that in a synchrotron, 100 billion (1011) electrons move in a circular orbit of circumference L=300 m . Determine the electric current in Amps due the flow...

*June 18, 2013*

**physics**

apply formula v=u-gt v=0 u=14 g=10 then t=1.4s

*June 17, 2013*

**physics**

Potential = electric field intensity * distance 1.44=a*10 a=0.144

*June 17, 2013*

**math**

Find the sum of all primes p, such that p divides up, where up is the p-th Fibonacci number.

*June 17, 2013*

**math**

The real numbers x and y satisfy the nonlinear system of equations {2x^2 − 6xy + 2y^2+ 43x + 43y = 174 x^2 + y^2 + 5x + 5y = 30. Find the largest possible value of |xy|.

*June 17, 2013*

**math**

What is the sum of all possible positive integer values of n, such that n^2+19n+130 is a perfect square?

*June 17, 2013*

**math**

S=1+2(1/5)+3(1/5)^2+4(1/5)^3…. If S=a/b, where a and b are coprime positive integers, what is the value of a+b?

*June 17, 2013*

**math**

Let S(N) denote the digit sum of the integer N. As N ranges over all 3-digit positive numbers, what value of N would give the minimum of M=NS(N)?

*June 17, 2013*

**math**

Find the sum of the squares of the three solutions of the equation x^3+3x^2−7x+1=0.

*June 17, 2013*

**math**

Consider the function defined as f(x)=(x^2+2x+3)^2+4. As x ranges over all real values, what is the minimum value of f(x)?

*June 17, 2013*

**math**

ABCD is a square. Γ1 is a circle that circumscribes ABCD (i.e. Γ1 passes through points A,B,C and D). Γ2 is a circle that is inscribed in ABCD (i.e. Γ2 is tangential to sides AB,BC,CD and DA). If the area of Γ1 is 100, what is the area of Γ2?

*June 17, 2013*

**math**

In an urn, there are several colored balls, with equal numbers of each color. We add 14 balls which are all of the same new color, that is different from those in the urn. It is calculated that the probability of drawing , without replacement, two balls of the same color is ...

*June 17, 2013*

**math**

Let S={1,2,3,4,…,2013} and let n be the smallest positive integer such that the product of any n distinct elements in S is divisible by 2013. What are the last 3 digits of n?

*June 17, 2013*

**math**

Find the minimum possible value of 2cos4θ+8cos3θ+32cos2θ+56cosθ+100

*June 17, 2013*

**math**

If ABC is a triangle with AB=20,BC=22 and CA=24. Let D lie on BC such that AD is the angle bisector of ∠BAC. What is AD^2?

*June 17, 2013*

**math**

ABCD is a square. Γ1 is a circle that circumscribes ABCD (i.e. Γ1 passes through points A,B,C and D). Γ2 is a circle that is inscribed in ABCD (i.e. Γ2 is tangential to sides AB,BC,CD and DA). If the area of Γ1 is 100, what is the area of Γ2?

*June 17, 2013*

**math**

Suppose A,B,C,D, and E are distinct positive integers such that A<B<C<D<E, their median is 10 and their mean is 15. Find the maximum possible value of D.

*June 17, 2013*

**math**

Suppose A,B,C,D and E are distinct positive integers such that A < B < C < D < E,their median is 10 and their mean is 15.Find the maximum possible value of D.

*June 17, 2013*

**calculus**

find equation of tangent line for x^(1/3) + y^(1/2)=2 at point (1,1)

*June 16, 2013*

**calculus**

estimate ln(e^2+0.1)-ln(e^2)

*June 16, 2013*

**calculus**

estimate ln(e^2+0.1)-ln(e^2)

*June 16, 2013*

**calculus**

estimate change in f using the linear approximation and compute both error and the % error f(x)= (3+x)^1/2 a=1 change in x=0.5

*June 16, 2013*

**algebra**

karas custom tees experienced fixed costs of $200 and variable costs of $5 a shirt. Write an equation that can determine the total expenses encountered by kara custom tees . let x be number of shirts, c be cost of producing x shirts

*June 16, 2013*

**calculus**

estimate change in f using the linear approximation and compute both error and the % error f(x)= (3+x)^1/2 a=1 change in x=0.5

*June 16, 2013*

**Physics**

11 c) please!!!

*June 15, 2013*

**Physics**

11 c) Is the net charge positive or negative?

*June 15, 2013*

**Physics**

Is this correct for 10 d)= P=1/3T * int(-L*w*(Imax)^2*sin(wt)*cos(wt), 0 , 3T) Thanks!!!

*June 15, 2013*

**Physics**

10 d) Positive or negative?

*June 15, 2013*

**Physics**

(t*s^2)/(2*(PI^2)*b*(b^2-a^2))

*June 15, 2013*

**Physics**

11 c) please!

*June 15, 2013*

**Physics**

and 10 d), please

*June 15, 2013*

**Physics**

f= 1/(2*pi*sqrt(L*C))?

*June 15, 2013*

**Physics**

10 b) please!

*June 15, 2013*

**Physics**

10 b) 10 d) and 11 c) please!!!!

*June 15, 2013*

**Physics**

robbo 10 b)

*June 15, 2013*

**Physics**

robbo, the same that 9 a)

*June 15, 2013*

**Physics**

Please 11 c) and 10!

*June 15, 2013*

**Physics**

I think a b is missing! t*s^2/(2*PI^2*b*(b^2-a^2) )

*June 15, 2013*

**Physics**

8 f) Result of e multiplied by 2*pi*b*d

*June 15, 2013*

**Physics**

Please OVNI, 11 c)

*June 15, 2013*

**Physics**

BG, do you have 10 c and d?

*June 15, 2013*

**Physics**

BG, 8 d) B= mu_0*(r^2-a^2)*s/(2*r*pi*(b^2-a^2))

*June 15, 2013*

**Physics**

5 e) v= m*g*R/(B^2*W^2)

*June 15, 2013*

**Physics**

Hi BG, can you put the results for 8 a, b,c?

*June 15, 2013*

**Physics**

Please, problem 8!!!

*June 15, 2013*

**Physics**

Phy, do you have problem 8?

*June 14, 2013*

**algerbra**

What is the median and the 1st or lower quartile of the following data: 4, 12, 15, 20, 24, 30, 32, 35

*June 6, 2013*

**Algebra**

The class average on a math test was 82 and there are 8 students in the class. If seven of the scores are 80, 90, 78, 100, 76, 74, and 82, what must the 8th score be to produce the average of 82?

*June 6, 2013*

**physics**

What is the radius of an automobile tire that makes a complete turn in 0.1 sec and has a linear speed of 24.0 m/s?

*June 4, 2013*

**Statistics**

For the mean add them all up and divide by 6. For the median line them in order. Find the average of the middle two numbers

*May 26, 2013*

**Calculus**

P = 2L + 2W 150 = LW 150/L = W P = 2L + 300/L Can you finish from here?

*May 26, 2013*

**math**

GREETINGS

*May 18, 2013*

**algebra**

x - 2.5 < or equal to 8

*May 17, 2013*

**math**

Start by arranging the numbers in order Plant 1 4 10 20 25 Since there are 4 numbers, the first quartile is 10 and the third quartile is 20. Find the difference = 10. Do the same for the rest of the plants and you will find the largest interquartile range.

*May 17, 2013*

**Physics**

From a height of 30.5 , a 1.45 bird dives (from rest) into a small fish tank containing 49.0 of water. What is the maximum rise in temperature of the water if the bird gives it all of its mechanical energy?

*May 16, 2013*

**Philosophy**

Anything is possible it must be possible that something is possible help you decide what is true help you know what to write about to correct wrong ideas ethos

*May 15, 2013*

**math**

how to describe a model that represents 3/3x4/4?

*May 14, 2013*

**Bio**

a cell membrane pump

*May 13, 2013*

**World Geography**

1. a 2. b 3. d 4. a 5. b 6. b 7. d 8. c 9. a 10. c 100% correct 10/10

*May 10, 2013*

**statistica**

To find the range subtract the smallest value from the largest. 9.0 - 2.0

*May 10, 2013*

**statistics**

.0733

*May 5, 2013*

**math**

s = sundaes b = banana splits s = 4b shop sels 4 times as many sundaes as banana splits 3.60(s) +4.25(b) = 3730 replace s with 4b 3.60(4b) + 4.25(b) =3730 Solve for b and then find s from 4 times b.

*May 3, 2013*

**chemistry**

24 times 12.45 grams and then change your answer to kilograms by dividing by 1000

*May 3, 2013*

**Statistic**

at least 47

*April 27, 2013*

**physic**

3) A shell is fired from ground level with a muzzle speed of 350 ft / s and elevation and angle of 60 . Find (a) parametric equation for the shell’s trajectory (b) the maximum height reached by the shell (c) the horizontal distance traveled by the shell (d) the speed of ...

*April 24, 2013*

**calculus**

3) A shell is fired from ground level with a muzzle speed of 350 ft / s and elevation and angle of 60 . Find (a) parametric equation for the shell’s trajectory (b) the maximum height reached by the shell (c) the horizontal distance traveled by the shell (d) the speed of ...

*April 24, 2013*

**6th grade Math**

38kg 4g divide by 12

*April 23, 2013*

**math**

if it took jeff 14 minutes to drive 10 1/2 mile how long will it take him to travel 23 miles?

*April 17, 2013*

**public speaking**

Which of the following is NOT true about persuasive speaking compared to informative speaking?

*April 17, 2013*

**statistics**

LSAT test scores are normally distributed with a mean of 490 and a standard deviation of 110. Find the probability that a randomly chosen test-taker will score between 320 and 600. (Round your answer to four decimal places.)

*April 16, 2013*

**Physics**

A 50g tennis ball is thrown with a velocity of 12 m/s. It strikes a wall and rebounds with a velocity of 10 m/s. a) What is the ball's initial and final momentum? b) what is the impulse on the ball? c) Thje ball is in contact with the wall for .10 second. with what force ...

*April 15, 2013*

**accounting**

Hillsborough Co. has an available-for-sale investment in the bonds of Schuyler with a carrying (and fair) value of $90,220. Hillsborough determined that due to poor economic prospects for Schuyler, the bonds have decreased in value to $58,450. It is determined that this loss ...

*April 14, 2013*

**Math ( Polynomial )**

This time three questions - 1. If (x^2 - 1 ) is a factor of polynomial ax^4 + bx^3 + cx^2 + dx + e, show that a + c + e = b + d = 0. 2. Let R1 and R2 be the remainders when polynomials x^3 + 2x^2 - 5ax - 7 and x^ 3 + ax^2 - 12 x + 6 are divided by ( x + 1 ) and ( x - 2 ) ...

*April 13, 2013*

**Math ( Polynomial )**

This time three questions - 1. If (x^2 - 1 ) is a factor of polynomial ax^4 + bx^3 + cx^2 + dx + e, show that a + c + e = b + d = 0. 2. Let R1 and R2 be the remainders when polynomials x^3 + 2x^2 - 5ax - 7 and x^ 3 + ax^2 - 12 x + 6 are divided by ( x + 1 ) and ( x - 2 ) ...

*April 13, 2013*

**Math ( Polynomial )**

If the polynomial, x^4 - 6x^3 + 16x^2 - 25x + 10 is divided by another polynomial x^2 - 2x + k, the remainder comes out to be x + a, find k + a, please work the complete solution instead of giving simply an answer.

*April 13, 2013*

**Physics :(( help please TT**

Anonymous, you're wrong, check back next week for solution.

*April 12, 2013*

**science**

You are wrong hgj.

*April 11, 2013*

**Math**

An ordered triple of real numbers (a,b,c) is called friendly, if each number is equal to the product of the other 2. How many friendly triples are there? Details and assumptions The numbers need not be equal to each other. The numbers need not to be pairwise distinct (which ...

*April 10, 2013*

**Math (Number Theory )**

An ordered triple of real numbers (a,b,c) is called friendly, if each number is equal to the product of the other 2. How many friendly triples are there? Details and assumptions The numbers need not be equal to each other. The numbers need not to be pairwise distinct (which ...

*April 10, 2013*

**applied calculus**

3. a) Write out the limit definition for the derivative of y = xx. Attempt to solve it. b) Write out the limit definition for the derivative of the inverse trig function from question 2. Attempt to solve it. c) Discuss the value of implicit differentiation. (Use questions 1 ...

*April 9, 2013*

**applied calculus**

Let y=〖tan〗^(-1) x Rewrite it as an equation involving a trig function. Use implicit differentiation to determine an expression for y.

*April 9, 2013*

**applied calculus**

1. Consider the function y = xx (for x> 0). a) Why does the derivative rule for xn not apply? b) Why does the derivative rule for ax not apply? c) What are the four magic properties of logarithms? d) Take the ln of both sides. Use the properties of logarithms and implicit ...

*April 9, 2013*

**Applied calculas**

3. a) Write out the limit definition for the derivative of y = xx. Attempt to solve it. b) Write out the limit definition for the derivative of the inverse trig function from question 2. Attempt to solve it. c) Discuss the value of implicit differentiation. (Use questions 1 ...

*April 8, 2013*

**Applied calculas**

Let y=〖tan〗^(-1) x Rewrite it as an equation involving a trig function. Use implicit differentiation to determine an expression for y.

*April 8, 2013*

**Applied calculas**

1. Consider the function y = xx (for x > 0). a) Why does the derivative rule for xn not apply? b) Why does the derivative rule for ax not apply? c) What are the four magic properties of logarithms? d) Take the ln of both sides. Use the properties of logarithms and implicit ...

*April 8, 2013*

**Statistics**

Events and are mutually exclusive. Suppose event occurs with probability and event occurs with probability . Compute the probability that occurs or does not occur (or both). Compute the probability that either occurs without occurring or and both occur.

*April 8, 2013*

**math**

I think there's an easier way to do this, 7^6/7^7 would be equals to 7^-1. According to the Law of Exponents powers with a same base number in division is simply subtracted.

*April 1, 2013*

**Spanish**

I tried on 8 but i didn't get 9. I do not know how to do these, so please help. Thank You. 8. Which of these sentences is correct? Juego baloncesto. Juego a la baloncesto. *Juego al baloncesto. 9. Which of these sentences is correct? Juego al golf. Juego golf. Juego a la ...

*March 28, 2013*

**spanish**

Thank You. Will you please answer the last one I just posted?

*March 28, 2013*

**spanish**

15. If you do an activity every day, which expression would you use to express that? siempre *todos los días nunca muchas veces a veces 16. If you do an activity always, which expression would you use to express that? *siempre nunca todos los días muchas veces a ...

*March 28, 2013*

**Spanish**

Thank You. Will you pleasse answer the last one I posted?

*March 28, 2013*

**Spanish**

5. Fill in the blank with the correct form of the verb jugar. yo __________ My Answer: yo juego 6. Fill in the blank with the correct form of the verb jugar. nosotros __________ My Answer: nosotros jugamos 7. Fill in the blank with the correct form of the verb jugar. ellos ...

*March 28, 2013*

**math**

1340 UNFAVORABLE

*March 28, 2013*

**Chemistry**

#7 -D #8 -B...is that better?

*March 28, 2013*

**Chemistry**

you are right I think #3 is B...#4 is A and #5 is A...haven't done 7 and 8 yet...how am I doing?

*March 28, 2013*

**Chemistry**

1. Which of the following metals is oxidized by calcium ions? *potassium zinc iron lead 2. The first electrochemical cell was invented by ____. Michael Faraday *Alessandro Volta James Maxwell Benjamin Franklin 3. Why can't a lead storage battery be recharged indefinitely...

*March 28, 2013*

**science**

Dest

*March 27, 2013*

**Chemistry**

1. Which metal is the most easily oxidized? A.) highly active metal *B.) moderately active metal C.) slightly active metal D.) an inactive metal 2. What happens in a voltaic cell? *A.) Chemical energy is changed to a electrical energy. B.) Electrical energy is changed to ...

*March 27, 2013*