Tuesday
November 25, 2014

Posts by Tom


Total # Posts: 1,112

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

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

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

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

chemistry
is a element an atom?
January 22, 2013

math help
340-127=213pages in the morning before the afternoon 253-213=40pages read in the afternoon
January 22, 2013

Pol 201 American National Goverment
some of these answers are wrong, do not trust them.
January 20, 2013

Physics
Suppose you have a very long straw that can reach from a cup of water on the ground level to the top of a very tall building. When you use a pump to suck on the straw in order to bring water up, a. you can bring the water up to any height with no problem. b. you can bring the ...
January 18, 2013

Pre-Algebra
3.25 for one batch of cookie 16.5/3.25= ___ batches of cookies
January 17, 2013

math
x=5 6x5=30+4=34
January 17, 2013

science
nvm i see it
January 17, 2013

science
Au-gold ag-sliver sn-tin hg-mercury pb-lead k-potassium w-tungsten fe-iron that's not what i meant. what does each abrevation mean in latin? the orgin name?
January 17, 2013

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