Wednesday

September 28, 2016
Total # Posts: 1,332

**Math**

Alvin, Calvin and Melvin are running laps around a track. Alvin runs a lap every 4 minutes, Calvin runs a lap every 6 minutes and Melvin runs a lap every 9 minutes. If they start off at the same point, how many minutes will it take before all three of them are back at the ...

*June 11, 2013*

**math help mepls**

180

*June 7, 2013*

**heeeeeeeeeeelp math**

90

*June 6, 2013*

**statistics**

Test the following function to determine whether it is a probability function. If it is not, then make it into a probability function. (Give your answers correct to one decimal place.) R(x) = 0.2, for x = 0, 1, 2, 3, 4 (a) List the distribution of probabilities. R(0) = R(1) = ...

*May 29, 2013*

**math**

Sorry, but this is the way it is written, that is why I do not understand it.

*May 29, 2013*

**math**

I don't know, is the answer 5-10=5 for mean????

*May 29, 2013*

**math**

Consider the probability function. (Give your answers exactly.) P(x) = 5 − x 10 , for x = 1, 2, 3, 4 (a) Find the mean. (b) Find the standard deviation.

*May 29, 2013*

**Math**

Find z, given the following. (Give your answer correct to two decimal places.) x = 56, ì = 45 and ó = 5.3 z =

*May 28, 2013*

**Math**

Find the area under the standard normal curve between z = 0.7 and z = 2.15, P(0.7 < z < 2.15). (Give your answer correct to four decimal places.)

*May 28, 2013*

**math**

Sorry I hit the wrong one, not sure who this is but it helped me too...you also answered one of my questions and I was saying thank you for it.

*May 28, 2013*

**math**

Thank you

*May 28, 2013*

**Statistics answer check**

I got 3.48 as the answer

*May 27, 2013*

**Statistics**

The survival rate during a risky operation for patients with no other hope of survival is 87%. What is the probability that exactly four of the next five patients survive this operation? (Give your answer correct to three decimal places.)

*May 27, 2013*

**Statistics**

Consider the probability function. (Give your answers exactly.) P(x) = 5 − x 10 , for x = 1, 2, 3, 4 (a) Find the mean. (b) Find the standard deviation.

*May 27, 2013*

**Statistics**

Test the following function to determine whether it is a probability function. If it is not, then make it into a probability function. (Give your answers correct to one decimal place.) R(x) = 0.2, for x = 0, 1, 2, 3, 4 (a) List the distribution of probabilities. R(0) = R(1) = ...

*May 27, 2013*

**statistics**

Find P(A or B). (Give your answer correct to two decimal places.) P(A) = 0.35, P(B) = 0.5, and P(A and B) = 0.18

*May 26, 2013*

**Statistics**

I did the same thing that Gayle done on this for x and then y which was both wrong answers.

*May 26, 2013*

**Statistics**

No it is written in book as (SS(x), so I have not ideal what to do on this one It ask for three answers in first question and 1 answer in the second part and I have missed all of it and I keep coming up with the same answers so I am not sure what I am doing on this one

*May 26, 2013*

**Statistics**

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) Incorrect: Your ...

*May 26, 2013*

**statistics**

Sorry, did not realize that I had done it twice was working on different problems...thought I had posted another question.

*May 26, 2013*

**statistics**

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) Incorrect: Your ...

*May 26, 2013*

**math**

if the pre-image's perimeter was 104 units, what is the images's perimeter

*May 19, 2013*

**Math (Algebra) (Distance Between 2 Lines)**

If real numbers a and b satisfy a^2 + b^2 = 64, what is the distance between the lines ax + by = 1 and ax + by = 417 ?

*May 13, 2013*

**Math (Algebraic Manipulation) Help me please**

An operation produces A−1/A from a fraction A= m/n, where m ≠ n and m ≠ 0. If the initial value of A is 24/47 and the operation is repeated 2012 times, the final output is a/b, where a and b are coprime positive integers. What is a+b?

*May 13, 2013*

**Math (Algebra)**

If positive integers x and y satisfy the equation xy−5x−10y+43=0, the sum x+y is constant. What is the value of x+y?

*May 13, 2013*

**Math (Algebra) Remainder Theorem**

What is the remainder when f(x)=x^2220 + x^2215 + x^2210 + … + x^10 + x^5 + x^0 is divided by x^4 + x^3 + x^2 + x + 1? Note that: x^0 = 1

*May 13, 2013*

**math**

Stacey used her 20% discount card to buy 7 cans of tomatoes and 15 cans of mushrooms for $10.64. The next day Brian spent $ 7.21 on 17 cans of tomatoes and 5 cans of mushrooms in a "30% off" sale. Find the undiscounted pre- sale price of each type of can.

*May 12, 2013*

**Math (Calculus) (Implicit Differentiation)**

The equation of the line tangent to (x^2+y^2)^4=16x^2y^2 at (x,y)=(−1,1) is ay = bx + c, where a, b and c are positive integers. What is the value of a+b+c?

*May 12, 2013*

**Math (Algebraic Manipulation)**

An operation produces A−1/A from a fraction A= m/n, where m ≠ n and m ≠ 0. If the initial value of A is 24/47 and the operation is repeated 2012 times, the final output is a/b, where a and b are coprime positive integers. What is a+b?

*May 12, 2013*

**Math (Algebra) (Distance Between 2 Lines)**

If real numbers a and b satisfy a^2 + b^2 = 64, what is the distance between the lines ax + by = 1 and ax + by = 417 ?

*May 12, 2013*

**Math**

Sam measured the length of an insect. He found it was between 3 1/2 inches and 3 3/10 inches long. Write a mixed number that could be the length of the insect

*May 9, 2013*

**Math (Trigonometry)**

Thank you very much! You're good! :)

*May 9, 2013*

**Math (Trigonometry)**

What is the maximum value of [9sinθ+2sin(θ+π/3)]^2?

*May 9, 2013*

**Math (Probability)**

Four players are playing a game involving choosing positions on a grid of size 3×8. Each player chooses a random position on the grid, then all players reveal their choices and a token is placed on each of the positions. The probability that the tokens form the vertices ...

*May 7, 2013*

**Math (Percentage)**

The price of a hat is reduced by a% from its regular price, and then is raised by a% from the reduced price. If the resulting price is an 81% discount from the regular price, what is a?

*May 7, 2013*

**Math (Trigonometry)**

θ is an acute angle such that tan(θ) = 12. What is the value of 5√5⋅(sinθ+cosθ)?

*May 7, 2013*

**Math (Trigonometry)**

In triangle ABC, we have AB = 16, BC = 29 and CA = √1097. What is the integer that is closest to 100 sin∠ABC?

*May 7, 2013*

**Science**

Identify six renewable (as opposed to depleted) sources of energy.

*May 2, 2013*

**Math 112**

for either standard form of the parabola, describe what happens to the shape of the parabola as p increases

*April 29, 2013*

**Math**

A rectangular livestock pen with THREE SIDES of fencing is to be built against the barn. The fencing is 1050ft long. Find the dimensions of the maximum area that can be enclosed. What is the maximum area?

*April 23, 2013*

**math**

A child’s kite is on top of a straight pine tree. A ladder is placed against the tree and touches the kite. The ladder forms a 45-degree angle with the flat ground. The base of the tree is 9 feet away from the base of the ladder. With only this information, how can you ...

*April 19, 2013*

**english**

how to do i do good on a ela multiple choice comprehension test. like can you give me some tips?

*April 15, 2013*

**Maths**

The first one can be any color. But after you draw it there will be only 9 of that color left. So the odds of drawing the same color again are 9/39.

*April 15, 2013*

**PHYSICS**

If you need me to show you how i can

*April 14, 2013*

**PHYSICS**

I dont know why that just happened?!

*April 14, 2013*

**PHYSICS**

How are you in sixth grade and doing these questions?! You must be really smart!

*April 14, 2013*

**PHYSICS**

The answer is 7m for the first one and B is yes she will

*April 14, 2013*

**mathematics**

Need help with these: Write the expression as a logarithm of a single quality. a) 3log[base5](a) + 4log[base5](b) - 2log[base5](c) b) 3log(2)-(1/3)log((x)^(2) - 1) I appreciate help.

*April 8, 2013*

**algebra**

Tom decides to make a rectangular desk top from a plywood door that was stored in the basement. The door was 2 feet longer than twice its width. To get the desired size desk he cuts 3 inches off its length and 1/2 foot off its width. If the plywood he cut off had a total area ...

*April 6, 2013*

**math**

find the value of k such that the equation e^(2x)=krootx has exactly one solution.

*April 4, 2013*

**math**

What is the value of u in the following system of linear equations? 4u + 3v = –1 3u + 2v = 1 a) 5 b)-11/2 C)-7 d)19/3

*April 2, 2013*

**math**

What is the value of t in the solution to this systems of linear equations? 2s – 3t = –1 3s – 4t = 0 a)–5 b)3 c)-7/3 d)4

*April 2, 2013*

**math**

What is the value of t in the solution to this systems of linear equations? 2s – 3t = –1 3s – 4t = 0 a)–5 b)3 c)-7/3 d)4

*April 2, 2013*

**la**

do you want our opinion for that?

*April 2, 2013*

**math**

Flight Path. In this problem you will use a cosine function to model the flight path of a plane that begins its descent from 20000 ft when it is 45 miles from the airport. Find the fuction p(x)= ACos(wx)+B that that gives the altitude in ft when the plane is x miles from the ...

*April 2, 2013*

**college algebra**

How much paper would you need to wrap a box 10cm wide, 25cm high, and 50cm long?

*April 2, 2013*

**calculus **

Flight Path. In this problem you will use a cosine function to model the flight path of a plane that begins its descent from 20000 ft when it is 45 miles from the airport. Find the fuction p(x)= ACos(wx)+B that that gives the altitude in ft when the plane is x miles from the ...

*April 1, 2013*

**math**

so there's a total of 15 marbles and there's 6 yellow marbles. thus the probability is 6/15

*April 1, 2013*

**math**

A firm issues bonds with a face value of 1000, a coupon rate of 7% and that will mature in 10 years and the market yield is 10% and pay interest semiannually what is the value. Please help

*March 31, 2013*

**math**

If a company issues bonds with a face value of $1000, a coupon rate of 7%, and that will mature in 10 years. The current market yield is 10%. if the bonds pay interest semiannually, what is the value of the bonds? please he;p with the formula?

*March 30, 2013*

**math**

If I need $25,000 in 4 years. Waht amount must i invest today if the investment earns 12% compounded semiannualy?

*March 30, 2013*

**statistics**

1234

*March 25, 2013*

**Calculus 2**

Hello, I don't know what test to use for this series: Determine the sum of the following series: inf E n=1 (2^n + 9^n) / 12^n thank you!

*March 22, 2013*

**am literature**

what does ethos pathos and logos mean

*March 17, 2013*

**Math**

Randy throw a base ball straight upwards, releasing it 6 ft above the round, and giving it an initial speed of v = 128 ft/sec. Use the formula h = -16t^2 + vt + 6 ft( where t = time , h = height ) to find the maximum height of the ball to reach this height.

*March 15, 2013*

**math**

a factory can produce 45 containers of yogurt in t minutes, 950 grams of fruit are used for every 25 containers of yogurt b) find in terms of t the time taken by the factory to produce 100 containers of yogurt c) if t=6 find the amount of fruit used in producing containers of ...

*March 5, 2013*

**maths and physics**

A cannon is placed on a hillside pointing up the hill, where the hill is at an angle a Pi/4 to the horizontal. The cannon points at an angle Pi/6 to the slope. and a shot is red uphill with initial speed v0. (i) Find the maximum value of the distance between the ...

*March 3, 2013*

**physics**

A truck of mass 13,100 kg is acted upon by a driving force of 8900 N. The motion is opposed by a frictional force of 2230 N. Find the acceleration.

*March 3, 2013*

**physics**

20 m/s 2 J

*February 25, 2013*

**calculus 2**

thanks steve!

*February 23, 2013*

**calculus 2**

integrate e^(2x) / (e^(4x) + 9) am I allowed to simplify the e^(2x) with the e^(4x)? Thank you

*February 23, 2013*

**I need help**

this is the Answer jiskha try it

*February 23, 2013*

**I need help**

1:compare and contrast 2:Taxies represent the modern world 3:things that we might not value until it’s too late 4:Nicole and Camille left work, went to the gym, and ate dinner before 7 p.m. 5:intercontinental

*February 23, 2013*

**trig sub question**

thank you Steve

*February 22, 2013*

**trig sub question**

Hello, I have a question concerning trigonometric substitution. let's say we have integral of dx/sqrt(9x^2 + 4), so after doing a few steps we have: 2/3 integral of sec0/sqrt((2tan0)^2 + 4*) d0 (the * is for later on) the next step turns into: 2/3 integral of sec0/(sqrt(...

*February 22, 2013*

**Math**

it was not negative that was a subtraction sign

*February 20, 2013*

**Math**

so lets say i had 4w-8-1w i take 4w+1w= 5w then i have -8 left and i do 5w-8

*February 20, 2013*

**Math**

help me combine like terms. like how do you do it with different signs in the problem. 17 + 4w - 12 - w

*February 20, 2013*

**marketing**

what is market segmentation

*February 19, 2013*

**math**

If the digits of a number may be any one of 0 through 9 (except the first digit cannot be zero), and the system of alternating signs of coefficients is used to create a polynomial, what is the least number m of real zeros the polynomial can have? What is the greatest number M ...

*February 11, 2013*

**math**

A box with an open top is to be constructed from a rectangular piece of cardboard with dimensions W inches by L inches by cutting out equal squares of side x at each corner and then folding up the sides. (W = 12 in. and L = 20 in). Find the values of x for which the volume is ...

*February 9, 2013*

**7th grade science help ASAP 2 questions!**

22. The joints highlighted in the image below are ______________ joints. image of transparent body with the spine highlighted

*February 7, 2013*

**math**

I am a 2-digit number with a 1-digit decimal. I am bigger than 54 but smaller than 56. 2 of my digits are even. When you divide my whole number by the digit in my decimal place, the answer has no remainder. What are the biggest and smallest numbers I could be?

*February 5, 2013*

**Calculus 2**

thanks!

*February 2, 2013*

**Calculus 2**

I have this integral that I don't know how to solve: ∫ (x-3)/sqrt(x) Would I multiply both parentheses first? or just turn it into (x-3)(x^-0.5)?

*February 2, 2013*

**calculus**

okay so there must be a mistake with the system, thanks for clearing that up Damon.

*February 2, 2013*

**calculus**

Using an upper-case "C" for any arbitrary constants, find the general indefinite integral ∫ (-2-t)(-9-t^2) dt Now I multiplied both parentheses to get: ∫ (18 + 2t^2 + 9t + t^3) dt now I integrated and got: 18t + 2t^3/3 + 9t^2/2 + t^4/4 + C but I'm ...

*February 2, 2013*

**Math**

2x-5=39 2x=39-5 2x=34 x=17

*January 29, 2013*

**math**

come on i waitied almost for 20 minutes and this is what i get. -_- not cool

*January 29, 2013*

**math**

A park ranger finds that 35% of the park visitors stay at the campground. Of 105 visitors stayed at the campground in one day, how many visitors did the park have that day? i got 36.75 people and then i rounded and got 37 people.

*January 29, 2013*

**calculus**

Thank Steve. But how do you get 60 or 70? or the -1?

*January 28, 2013*

**calculus**

it's integral, not interal, sorry for the mistake

*January 28, 2013*

**calculus**

find the derivative of: g(x) = interal(a=7x, b=6x) (u+5)/(u-5) du Hint: interal(a=7x, b=6x) (u+5)/(u-5) du = interal(a=0, b=6x) (u+5)/(u-5) du + interal(a=7x, b=0) (u+5)/(u-5) du

*January 28, 2013*

**math**

EXPLAIN HOW YOU CAN BREAK 6X7 ARRAY IN TO SMALLER ARRAYS .WHAT ARE THE NEW FACTS?

*January 28, 2013*

**Physics**

pickett!!!

*January 27, 2013*

**math**

If a farm as 13 heads and 36 feet. How many chicken are there and how many rabbit are there?

*January 25, 2013*

**math**

If a farm as 13 heads and 36 feet. How many chicken are there and how many rabbit are there?

*January 25, 2013*

**physics**

nevermind, got it, had to switch calculator from degrees to radian, hehe

*January 23, 2013*

**physics**

The displacement of a particle in centimeters is given by y=8 sin (2πft). If f=20 Hz, find the displacement and the velocity of the particle at a time t=0.01 s and 0.07 s. (ans: y=7.61 cm, v=3.11 m/s, y=4.70 cm, v= -8.13 m/s) After I plug in f to get w and switch to this ...

*January 23, 2013*

**ANSWER MY QUESTION **

IS AN ATOM AN ELEMENT

*January 22, 2013*