Friday

April 18, 2014

April 18, 2014

Total # Posts: 1,295

**math**

what's the sum of infinite terms?

**math**

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

**math**

If z=−√2/2+√2/2 i, what is the value of −(z^−52)? i is the imaginary unit where i^2=-1

**math**

A 999-digit number starts with 9. Every 2 consecutive digits is divisible by 17 or 23. There are 2 possibilities for the last 3 digits. What is the sum of these 2 possibilities?

**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.

**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 b...

**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...

**physics**

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

**physics**

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

**math**

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

**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|.

**math**

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

**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?

**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)?

**math**

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

**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)?

**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?

**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 co...

**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?

**math**

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

**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?

**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?

**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.

**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.

**calculus**

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

**calculus**

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

**calculus**

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

**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

**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

**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

**Physics**

11 c) please!!!

**Physics**

11 c) Is the net charge positive or negative?

**Physics**

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

**Physics**

10 d) Positive or negative?

**Physics**

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

**Physics**

11 c) please!

**Physics**

and 10 d), please

**Physics**

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

**Physics**

10 b) please!

**Physics**

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

**Physics**

robbo 10 b)

**Physics**

robbo, the same that 9 a)

**Physics**

Please 11 c) and 10!

**Physics**

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

**Physics**

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

**Physics**

Please OVNI, 11 c)

**Physics**

BG, do you have 10 c and d?

**Physics**

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

**Physics**

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

**Physics**

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

**Physics**

Please, problem 8!!!

**Physics**

Phy, do you have problem 8?

**algerbra**

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

**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?

**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?

**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

**Calculus**

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

**algebra**

x - 2.5 < or equal to 8

**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.

**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?

**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

**math**

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

**statistica**

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

**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.

**chemistry**

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

**Statistic**

at least 47

**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 t...

**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 t...

**6th grade Math**

38kg 4g divide by 12

**math**

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

**public speaking**

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

**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.)

**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 d...

**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 i...

**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 ) respe...

**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 ) respe...

**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.

**Physics :(( help please TT**

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

**science**

You are wrong hgj.

**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 me...

**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 me...

**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 a...

**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.

**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 d...

**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 an...

**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.

**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 ...

**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.

**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.

**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 g...

**spanish**

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

**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 ...

**Spanish**

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

**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 ___...

**math**

1340 UNFAVORABLE

**Chemistry**

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

**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?

**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?...

**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 chemi...

**Englisj**

ok. Thank you.

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