Thursday
October 2, 2014

Posts by sarah


Total # Posts: 4,005

Math
Tim Worker buys a new sofa for $549.95. He pays 20% down and takes an installment loan to complete the purchase. He makes 12 payments which include his principal and a $50.00 finance charge. What is the APR on his loan? The down payment is $ The amount financed is $ The ...
July 8, 2013

probability
A stock market analyst figures the probabilities that two related stocks, A and B, will go up in price. She finds the probability that A will go up to be 0.6 and the probability that both stocks will go up to be 0.4 What should be her estimate of the probability that stock B ...
July 7, 2013

probability
Assume that there is an urn containing seven $50 bills, six $20 bills, five $10 bills, four $5 bills, and one $1 bill and that the bills all have different serial numbers so that they can be distinguished from each other. A person reaches into the urn and withdraws one bill ...
July 7, 2013

math
there are 6 white balls and 4 black balls.i takeout 2 balls at random,one at a time,without replacement.What is the probability that the second ball i take is black
July 6, 2013

math - help please
Assume that 2 cards are drawn in succession and without replacement from a standard deck of 52 cards. Find the probability that the following occurs: the second card is a 9, given that the first card was a 9.
July 6, 2013

probability
For a family with 2 children, the sample space indicating boy (B) or girl (G) is BB, BG, GB, and GG. If each of the outcomes is equally likely, find the probability that the family has 2 girls, given that the first child is a girl.
July 6, 2013

chemistry
can you explain how to find the bond order of (σ1s)^2(σ1s*)^2(σ2s)^2(σ2s*)^2(σ2p)^2(π 2p)^4(π 2p*)^2... I know that Bond order = (number of bonding electrons - number of antibonding electrons)/2 but i have no idea what to do..
July 3, 2013

Science
How far will a ball travel in 4.2 s if a baseball thrower pitches ball at 43 ms-1? (make sure you have the correct units)Velocity (ms-1) = Distance (m) / Time (s)
June 29, 2013

Math
Find the area of a circle whose circumference measures 100 cm. Area (to the nearest square centimeter) = cm2 I plugged in everything C = 2 r C=2x3.14x100= 628 <<< The computer said it was WRONG ! Then, I tried C= 2X3.14X50= 314 !!! If I am wrong can you EXPLAIN to me ...
June 28, 2013

Math
Omg Thank you !! I now know how to solve this type of problem the correct way ! Thank you so much !
June 28, 2013

Math
How did you get 26.67?
June 28, 2013

Math
Compute the area of a triangle with a base of 15 cm and an altitude of 10.5 in. Area (to the nearest tenth) = cm2 I plugged everything into the area formula which is A = (1/2)bh . A=.5x15x10.5= I got 78.75 rounded 78.8. The computer keeps saying I am wrong. What am I doing ...
June 28, 2013

Chemistry
nevermind dr. bob i figured it out.. the volume was 25 mL
June 27, 2013

Chemistry
is it 404?
June 27, 2013

Chemistry
do you know what the molar mass is?
June 27, 2013

Chemistry
we needed to make the solution's concentration about 0.002 M.
June 27, 2013

Chemistry
we did 1 dilution and do you need to know how much water is added? I attempted the problem and the hint that was given said..."use the mass of iron nitrate and the volume of your final solution to determine the concentration of the final solution."
June 27, 2013

Chemistry
If you weigh out 2.083 g Fe(NO3)3·9H2O, what is the final concentration of the dilute Fe(NO3)3 solution that you make?
June 27, 2013

Math
17,977.5
June 26, 2013

Math
You are given the job of laying carpet for a six-story building. At each floor the dimensions of the floor are 75 meters in length by 40 meters in width. A stairwell takes up a space 2.5 m by 1.5 m, and cuts through each floor. If the rest of the floor area is to be carpeted, ...
June 26, 2013

Math
A cylinder has a radius of 2 feet and a height of 18 feet. Volume (to the nearest tenth) = a0 cubic feet i TRIED to work out this problem. The answer I got was 226.3 I used the cylinder volume formula which is π r2 h.! The computer says my answer is wrong. what am I doing...
June 25, 2013

Math
V = 4/3r3. A sphere has a radius of 4 inches. Volume (to the nearest tenth) = cubic inches The answer I got was 261.2 but it was wrong.
June 25, 2013

physics
a 17 kg sled is being pulled along the horizontal snow covered ground by a horizontal force of 22 N. starting from rest the sled attains a speed of 1.9 m/s in 7.8 m find the coefficient of kinetic fiction between the runners of the sled and the snow.
June 25, 2013

English
Okay, thank you so much!
June 24, 2013

Math
I need help with this I keep putting the numbers in wrong on the formula ! PLEASE HELP Price of article = $315.50 Down payment = $31.55 Monthly payment amount = $16.50 Duration of payments = 20 months True annual interest rate to the nearest tenth = % Formula: I(Interest)= 2YC...
June 24, 2013

Math
formula
June 24, 2013

Math
Weird lol Well this is the formula I= 2yc/m(n+1) y = payments per year; c = total interest paid; m = amount financed; n = total number of payments. I do not know how to plug the numbers in right with this equation.
June 24, 2013

Math
I got 4.72& the computer says the answer was wrong.
June 24, 2013

Math
Your service contract for washer repair maintenance is offered at $48 per year. If a customer wants to pay it off in equal monthly installments for one year and if the true annual interest charge is 18%, what should his monthly payment be?
June 24, 2013

math
Your service contract for washer repair maintenance is offered at $48 per year. If a customer wants to pay it off in equal monthly installments for one year and if the true annual interest charge is 18%, what should his monthly payment be?
June 23, 2013

Math
Price of article = $315.50 Down payment = $31.55 Monthly payment amount = $16.50 Duration of payments = 20 months True annual interest rate to the nearest tenth= %
June 23, 2013

Chemistry
So would it be (3)(.750)/13? .1731 would be the answer?
June 21, 2013

Chemistry
Consider this molecular-level representation of a gas. 5 orange 6 green---> 3 pairs 6 blue If the partial pressure of a diatomic gas is .750 atm, what is the total pressure?
June 21, 2013

Math
Weights of the vegetables in a field are normally distributed. From a sample Carl Cornfield determines the mean weight of a box of vegetables to be 180 oz. with a standard deviation of 8 oz. He wonders what percent of the vegetable boxes he has grouped for sale will have a ...
June 19, 2013

Math
Weights of the vegetables in a field are normally distributed. From a sample Carl Cornfield determines the mean weight of a box of vegetables to be 180 oz. with a standard deviation of 8 oz. He wonders what percent of the vegetable boxes he has grouped for sale will have a ...
June 18, 2013

math
Express your answer as a decimal (to the nearest hundredth). What part of an hour is 40 minutes?
June 18, 2013

math
On Team B 80% of the football players weigh more than 200 pounds. If 41 men are on the team, how many weigh more than 200 pounds?
June 18, 2013

English Composition II
The practical context of an e-mail includes all of the following EXCEPT:
June 4, 2013

Math
The mass of a jar of beans is 525 g. If the jar has a mass of 25 g, the beans alone must have a mass of:
June 4, 2013

Math
In a right triangle, there is arithmetic sequence. If the shortest side is 15 cm long, what is te length of the other 2 sides. ( hint use pytageron Therom)
June 4, 2013

Math
In a right triangle, there is arithmetic sequence. If the shortest side is 15 cm long, what is te length of the other 2 sides. ( hint use pytageron Therom)
June 4, 2013

Statistics
Air America has a policy of booking as many as 15 persons on an airplane that can seat only 14. (Past studies have revealed that only 86% of the booked passengers actually arrive for the flight.) Find the probability that if Air America books 15 persons, not enough seats will ...
June 2, 2013

Statistics
Air America has a policy of booking as many as 15 persons on an airplane that can seat only 14. (Past studies have revealed that only 86% of the booked passengers actually arrive for the flight.) Find the probability that if Air America books 15 persons, not enough seats will ...
June 2, 2013

Statistics
Individuals who have a certain gene have a 0.50 probability of contracting a certain disease. Suppose that 1,940 individuals with the gene participate in a lifetime study. What is the standard deviation of the number of people who eventually contract the disease? Round your ...
June 2, 2013

Statistics
In an elementary school, 25% of children wear glasses. Suppose that a random sample of 64 children is selected. Find the mean number of children in the sample who wear glasses. Round your answer to the nearest integer.
June 2, 2013

Statistics
In an elementary school, 25% of children wear glasses. Suppose that a random sample of 64 children is selected. Find the mean number of children in the sample who wear glasses. Round your answer to the nearest integer.
June 2, 2013

Statistics
In an elementary school, 25% of children wear glasses. Suppose that a random sample of 64 children is selected. Find the mean number of children in the sample who wear glasses. Round your answer to the nearest integer.
June 2, 2013

Statistics
In an elementary school, 25% of children wear glasses. Suppose that a random sample of 64 children is selected. Find the mean number of children in the sample who wear glasses. Round your answer to the nearest integer.
June 2, 2013

Statistics
In an elementary school, 25% of children wear glasses. Suppose that a random sample of 64 children is selected. Find the mean number of children in the sample who wear glasses. Round your answer to the nearest integer.
June 2, 2013

Statistics
Assume that in a binomial experiment that n = 12, p = 0.28, and x = 4. Use the binompdf command in the TI-84 calculator to find the probability. Round your answer to 2 decimal places.
June 2, 2013

Statistics
The probability that a randomly selected individual in a certain community has made an online purchase is 0.45. Suppose that a sample of 10 people from the community is selected, what is the probability that at most 3 of them has made an online purchase? Round your answer to 2...
June 2, 2013

Statistics
The probability that a student uses the Academic Resource Center on a regular basis is 0.26. In a group of 18 students, what is the probability that exactly 8 of them use the Academic Resource Center on a regular basis? Round your answer to 2 decimal places.
June 2, 2013

Discrete Math
Apparently I was not the only one who was confused if this was True or False? This was the professor's response: "Nice! #6 is not counted, because question is somewhat ambiguous: Homogeneous linear recurrence relations are not linear combinations of power functions. ...
May 31, 2013

Discrete Math
True or False? Homogeneous linear recurrence equations are linear combinations of power functions. I think the answer is false because although a homogeneous linear recurrence equation is a linear combination, it is composed of constant coefficients. However to solve this ...
May 31, 2013

math - discrete math
Thank you for the help MathMate I really appreciate it :) And yes in this question order matters. I apologize this was a 3 part question and that was mentioned in part a). I was able to understand all parts but the last one. Your explanation makes sense.
May 28, 2013

math - discrete math
A vending machine dispensing books of stamps accepts only one-dollar coins, $1 bills, and $5 bills. How many ways are there to deposit $10 for a book of stamps? Note: I have the answer but do not know how to solve for it. Answer: 1,217
May 28, 2013

Physic Please Help
A pilot direct his plane north and the plane's velocity in still air is 245km/hr. If there is a strong wind of 105km/hr blowing west, what is the ground velocity of the plane?
May 28, 2013

History
True or False. (If false correct it) The ancient Greeks were interested in philosophy, not nature,so they did little to advance scientific knowledge. Please help! Thank you :)
May 24, 2013

Geometry
Find the volume of a rectangular box. The faces have areas of 15, 25, and 60.
May 22, 2013

Math Geometry
How do you put your knowledge of quadrilaterals to kites?
May 22, 2013

Please answer this question as soon as posibble
I did the paraphrases for the story is it the correct way. Lifeguard Assignment Chris doesn’t like children, but he works as lifeguard at the Brigeland Community swimming. He does not like children a lot, but he is working as a lifeguard at the Brigeland Community ...
May 22, 2013

English Please answer ASAP
I did the paraphrases. I want to know is it the correct way r no
May 22, 2013

English Please answer ASAP
Lifeguard Assignment Chris doesn’t like children, but he works as lifeguard at the Brigeland Community swimming. He does not like children a lot, but he is working as a lifeguard at the Brigeland Community swimming pool. He spends most of his time at the swimming pool. It...
May 22, 2013

Calculus II
Find the sum of the series (infinity above sigma) signma and n = 4 3^n-2 divided by 2^2n-3 please I really need help on this
May 20, 2013

statistics
Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the population of a city that has 500,000 people. ...
May 20, 2013

statistics
Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the population of a city that has 500,000 people. ...
May 20, 2013

Algebra
PLEASE
May 20, 2013

Algebra
A triangle has an area of 60 in^2. Its base is 10 inches and its height is √x inches. What is the value of x? What is the height of the triangle? Please show all work that you use to determine your answer. (Hint: The formula for the area of a triangle is A= 1/2bh where b...
May 20, 2013

world geography
i need help with number 16. can anyone help me?
May 19, 2013

Math
Sarah was given a sum of money. She spent the same amount of money each day. She spent 2/7 of her money in 6 days. After another 5 days, she had $20 left. How much money did she have at first.
May 19, 2013

mathematic
ans of c ???? is 1 ????
May 18, 2013

statistics
its wrong :(
May 18, 2013

statistics
can any one tell me the ans of D plz ???
May 18, 2013

physic
1. Given the following velocity-time graph: V-T Graph 10 Velocity, m/s 5 10 15 Time -10 a. Calculate the displacement at the end of 20 seconds.
May 16, 2013

Geometry
A simple graph G has 200000 edges and for any 3 vertices v,w,x, at least one of the edges vw,wx,xv is not present in G. What is the least number of vertices that G can have?
May 16, 2013

Math
The squares of a 2×500 chessboard are coloured black and white in the standard alternating pattern. k of the black squares are removed from the board at random. What is the minimum value of k such that the expected number of pieces the chessboard is divided into by this ...
May 16, 2013

Physics
Two point charges +q=1 ìC and −q=−1 ìC with mass m=1 g are fixed at the positions ±r ⃗ 0 with |r 0 |=1 m . The charges are released from rest at t=0 . Find the time ô in seconds at which they collide.
May 15, 2013

Algebra
What is the largest prime factor of 5^8 +2^2 ?
May 15, 2013

Calculus help!
Describe the following surface and give traces where available: 16x^2 + 16y^2 - 9z^2 = 0
May 10, 2013

physics
the gravity on mars is 3.69 meters/second^2. if you had a pendulum on mars that was 1.8 meters long. what would the period be?
May 8, 2013

Chemistry
Which two elements is the second transition series (y through Cd) have four unpaired electrons in their 3+ ions?
May 7, 2013

Chemistry
An unknown solid acid is either citric acid or tartaric acid. To determine which acid you have, you titrate a sample of the solid with NaOH. The appropriate reactions are as follows: Citric acid: H3C6H5O7 (aq) + 3NaOH (aq) -> 3H2O (l) + Na3C6H5O7 (aq) Tartaric acid: ...
May 7, 2013

Chemistry
Estimate how many microwave photons with 1=12 cm must be absorbed to raise the temperature of your eye by 3 degree C. Assume the mass of an eye is 11 g and its specific heat capacity is 4.0 J/g/k
May 7, 2013

geomerty
Find the area of the regular polygon. Round your answer to the nearest tenth. the individual sides are 10 the radius is 13.07
May 4, 2013

math
would it be 3 pi 4 sq units
May 4, 2013

Physics
Here's a neat trick. If your average ceramic bowl has a mass of 200 g, what is the difference in Newtons between the weight of the bowls on the top of her head before and after she does the trick?
May 4, 2013

chem
Chromium(III) chloride(aq) + potassium sulfide(aq) what are the products of this reaction
April 30, 2013

chem
takes 190. seconds for a sample of carbon dioxide to effuse through a porous plug and 295 seconds for the same volume of an unknown gas to effuse under the same conditions. What is the molar mass of the unknown gas? Enter your answer to 3 significant figures.
April 29, 2013

Biology
Is 9th grade biology hard? Is it interesting...?? I love life science but I just wondering if 9th grade biology hard??? I'm taking biology next year.
April 29, 2013

Science 8R - help!
why... would I ask for geography this have something to do with SCIENCE (aka food webs) What is consumers???
April 29, 2013

chem
For the following combination of reactants, enter the formulae of the products in the space provided and give their states. (Separate multiple products with a comma ",". Type your answer using the format Na2SO4(aq) for Na2SO4(aq). Do not balance the equation. If ...
April 28, 2013

chem
oops just the last part
April 28, 2013

chem
I actually figured out how to do that one. but i have another one Question Part Points Submissions Used 1 –/1 0/4 Total –/1 .This question has some parts which are scored using special conditions. Question Part 1: A deduction of 10% of the points for this question ...
April 28, 2013

chem
How many grams of TiCl4 are needed to produce 17.8 g of titanium? what equation do i use?
April 28, 2013

Algebra
A freight train leaves Chicago traveling West at 35 mph. An hour later a passenger train leaves Chicago traveling on a parallel track at 60 mph. How far from Chicago will the passenger train catch up to the freight train?
April 28, 2013

L.o
Identify nd describe 3 environmental health hazards tht cause ill health,crises nd disasters in south africa?
April 28, 2013

chem
The half-life of is 30.0 days. What fraction of a sample of this isotope will remain after 16.2 days?
April 27, 2013

math
if 1,x,y is a geometric sequence and x,y,3 is an arithmetic sequence, compute the maximum value of x+y
April 27, 2013

chem
What is the empirical formula of the compound with a mass percent composition of 70.0% Fe and 30.0% O? (Type your answer using the format CH4 for CH4
April 27, 2013

chem
What is the empirical formula of the compound with a mass percent composition of 70.0% Fe and 30.0% O? (Type your answer using the format CH4 for CH4
April 27, 2013

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