Friday

January 30, 2015

January 30, 2015

Total # Posts: 93

**precalculus **

After 3 hours the number of bacteria in a culture is observed to have doubled. Find the time that it takes the culture to grow to 30 times its initial size.
*October 21, 2014*

**precalculus**

After 3 hours the number of bacteria in a culture is observed to have doubled. Find the number of bacteria present after 8 hours.
*October 21, 2014*

**geography**

List as many ways as you can remember about how you are involved in the burning of fossil fuels on a dily basis.
*July 8, 2014*

**english**

on my first baby-sitting job ,I found that one must have____patience to take care of young children
*November 3, 2013*

**chemistry**

2.4g of a compound of carbon, hydrogen and oxygen gave on combustion, 3.52g of CO2 and 1.44g of H2O. The relative molecular mass of the compound was found to be 60. a)What are the masses of carbon, hydrogen and oxygen in 2.4g of the compound? b)What are the emperical and ...
*October 20, 2013*

**chemistry**

2.4g of a compound of carbon, hydrogen and oxygen gave on combustion, 3.52g of CO2 and 1.44g of H2O. The relative molecular mass of the compound was found to be 60. a)What are the masses of carbon, hydrogen and oxygen in 2.4g of the compound? b)What are the emperical and ...
*October 20, 2013*

**Geometry**

Find the surface area of a cylinder whereas diameter is 9 ft and height is 24 ft
*March 28, 2013*

**math**

need help
*March 7, 2013*

**math**

2x^2+7x+3/x^2-2x-15
*March 7, 2013*

**math**

okay my answer is correct 128,246
*July 15, 2012*

**math**

If the the total enrollment in LA county combined schools was 1,583,283 students in 1997, approximately how many of those student were Asian at 8.1 8.1% choices: 194,467, 904,055, 128,246 , 19,546,704, 1,282,459 my answer is 128,246 multiplied 1583283*8.1%= 128,24592.3
*July 15, 2012*

**probability**

i figured it out 5*5*5=125
*July 15, 2012*

**probability**

i typed the wrong answer it is 125
*July 15, 2012*

**probability**

3. A bag contains five different lightbulbs. The bulbs are the same size but each has a different wattage. If you select three bulbs at a random,how many different outcomes will be in the sample space if the bulbs are selected without replacement? I understand there is 5 ...
*July 15, 2012*

**Math**

thanks for the explaning it. I understand that much better
*July 14, 2012*

**Math**

The mean of five numbers is 8. If one of the numbers is removed from the list, the mean becomes 7. what is the number that was removed. I could not figure this out.
*July 14, 2012*

**statistic**

age days in hospital 40 11 36 9 30 10 27 5 24 12 a. draw a scatter diagram (completed) b. does there appear to be a correlation between age and number days in the hospital? no Find the r value for this problem to verify your answer? R=.16 c what is the regression equation for ...
*July 14, 2012*

**statistic **

age days in hospital 40 11 36 9 30 10 27 5 24 12 a. draw a scatter diagram (completed) b. does there appear to be a correlation between age and number days in the hospital? no Find the r value for this problem to verify your answer? R=.16 c what is the regression equation for ...
*July 13, 2012*

**TI 84 Plus**

How do i get to the regression equation on the ti84 plus calculator. I am working on a math problem trying to view my equation once i plugged in the data
*July 13, 2012*

**statistic**

If the total enrollment in LA County Combined schools was 1,583,283 students in 1n 1997, approximately how many of those students were Asian. Other =2.70% White =20.30% Black =11.80% Asian = 8.10% Hispanic 57.10% answer: I multiplied 1,583283*0.0810=128,246 Is this correct?
*July 13, 2012*

**statistic**

1.The state highway patrol stops every 5th car on highway 210 to check drivers' licenses and registrations. Which sampling technique are they using? systematic sampling -chose this one convenience sampling cluster sampling simple random sampling stratified sampling 2.You ...
*July 13, 2012*

**statistic**

thanks!
*July 12, 2012*

**statistic**

except for the company you use for your cell phone I meant to take that out.
*July 12, 2012*

**statistic**

Choose ALL that represent quantitative data. the amount of time you spend studying each week your street address how many years you have owned your car the company that you use for cell phone service the number of people who live with you your score on the last MAT 115 test my...
*July 12, 2012*

**statistic**

I guess to look at it would fall into the salary range. i was looking at average is how i got my answer thanks!
*July 12, 2012*

**statistic **

Which "average" would be best to use in the following situation? The accountant for a small company is asked to determine the average salary of its employees. The company is owned by two brothers who each make over $300,000 per year. The accountant makes $80,000 per ...
*July 12, 2012*

**statistic**

what type of correlation would you expect to exist between people's height and their shoe size? My answer is a positive correlation.
*July 12, 2012*

**statistic**

thanks i am getting it
*July 12, 2012*

**statistic **

The data below represent the ages of female actors at the time of winning an Oscar (1956 - 1996). 41 27 34 34 41 30 61 42 49 27 31 60 34 35 74 21 29 39 39 37 61 26 31 33 41 33 38 30 26 37 41 49 26 35 28 24 35 42 33 38 81 45 What is the frequency for the class 41 - 50? the ...
*July 12, 2012*

**math**

ok, I understand now thanks!
*July 12, 2012*

**math**

Suppose 48% of the general population of thw world has blood type O, 27% blood type A, and 23% blood type B. a. what is the probability that someone has type AB blood( assume that there are only four blood types? b. Of tjere are 30 people in a room,how many would you expect to...
*July 12, 2012*

**Probability**

thanks!
*July 11, 2012*

**Probability**

If a women with a BMI below 25 are considered to be normal weight, how many of these women would be classified as overweight? If you choose a woman at random, what is the probability that she will be overweight. Chart below BMI Frequency 15.0-19.9 9 20.0-24.9 12 25.0-29.9 25 ...
*July 11, 2012*

**math**

4/11 got it thanks!
*July 7, 2012*

**math**

2/11 got it
*July 7, 2012*

**math**

I hope i am on the right track. Please look at my answer so I am doing correctly. The letters of the word mathematics are written on separate pieces of paper and put in a hat. What is the probability of drawing a vowel from the hat? (vowels are a, e, i, o u.) Number of letters...
*July 7, 2012*

**math**

Tom plans to purchase a used car for $18,450. The dealership will finance his purchase at 10.5% APR for 48 months. Calculate the amount of Tom's monthly payment if he makes a down payment of $3,450 on the car
*July 6, 2012*

**math **

How much interest will you earn on $5,000 if you invest the money in a 5-year certificate of deposit earning 3% compounded quarterly. Round your answer to the nearest cent.
*July 6, 2012*

**math**

thanks
*July 6, 2012*

**math**

Mary has seven decorative vases to arrange on a shelf. How many different arrangements are possible?
*July 6, 2012*

**probability**

11 in mathematics so 2/11
*July 5, 2012*

**probability**

The letters of the word mathematics are written on separate pieces of paper and put in a hat. What is the probability of drawing the letter m from the hat? my first answer is 2/12= 1/6 someone else has 2/11 please show us the correct answer thanks!
*July 5, 2012*

**math**

If your class has 10 males and 14 females in it, how many different committees consisting of 4 males and 4 females may be chosen.
*July 4, 2012*

**math**

1. A card is drawn from an ordinary deck of 52 playing cards. What are the odds in favor of drawing an ace? 2. The letters of the word mathematics are written on separate pieces of paper and put in a hat. What is the probability of drawing a vowel from the hat? (vowels are a, ...
*July 4, 2012*

**world history**

The animating principles of Benedict's rules for monks are the quest for salvation and
*April 26, 2012*

**Chemistry**

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.
*March 4, 2012*

**math**

the factors of 8 that she can roll are 4,8,and 8 there are 6 sides to the cube therefore six posibilites total so 3/6 chance because 2/6 chance of rolling 8 and 1/6 chance of rolling 4 2/6 +1/6=3/6
*March 1, 2012*

**arithmetic**

21terms/3terms=7groups of 3terms 237(last group)-129 (middle group)=36 237(group7)-36=201(group6) group6-36 group5-36 129(group4)-36=95(group3) group3-36 group2-36 add up all group terms(237+201+165...) Hope thats what your looking for if not sorry, but that should be right
*March 1, 2012*

**Physics**

Workers have loaded a delivery truck in such a way that its center of gravity is only slightly forward of the rear axle, as shown in the drawing. The mass of the truck and its contents is 6675 kg. Find the magnitudes of the forces exerted by the ground on the following. (a) ...
*March 1, 2012*

**Chemistry**

ok so for the second part this is what I did. 0.082=x/4=0.328g 0.08969=x/2=0.179g I feel like I have done something wrong though
*February 19, 2012*

**Chemistry**

Ok so for the first part I got x=0.08969 for H2 and x=0.082 for He. but how do I convert to molecules? Working on the second part now
*February 19, 2012*

**Chemistry **

You have two gas-filled balloons, one containing He and the other H2. The H2 balloon is twice the size of the He balloon (let the He balloon have a volume of 1 -L and the H2 balloon. a volume of 2 L). The pressure of gas in the H2 balloon is 1 atm while that in the He balloon ...
*February 19, 2012*

**Math-geometry**

f t t f f
*July 12, 2011*

**chemistry**

A buffer is formed by mixing 100 mL of 0.2 M HClO2 and 200 mL of 0.7 M KClO2. What volume of 0.2 M KOH can be added before the buffer capacity is reached?
*March 2, 2011*

**math **

find the fracton notation for the ratio 73/88
*February 18, 2011*

**oz**

IT TAKES 60oz of grass seed to seed 2400ft^2 of lawn. at this rate, how much will be needed for 4400ft^2 of lawn?
*February 17, 2011*

**P I **

the amount in a savings account increased from $60 to $84. what i sthe precent increase?
*February 17, 2011*

**MPG**

a passenger car will go 525 miles on 17.5 gallons of gasoline in city of driving. what is the rate miles per gallon?
*February 17, 2011*

**notation**

precent notation of 5/8
*February 17, 2011*

**commission rate**

a salesperson earns 150 commission selling 3,000 worthof television sets. what is the commission rate?
*February 17, 2011*

**Math **

The cost for a 30-second ad during the 2010 Super Bowl was $2.8 million. Assuming the rate per second to be constant, what was the average cost per ad that was broadcast during the Super Bowl in 2010? Express your answer as a whole number to the nearest thousand dollars.
*February 13, 2011*

**algebra**

-6m+3/11=7
*January 20, 2011*

**9th grade**

you push a book on a table so that its velocity is constant. If the force you apply is 15 N, what is the force due to sliding friction
*November 1, 2010*

**10th grade**

HOW DO YOU YOU ADD ALL THE HEARD MATH WITH THE EASY
*September 30, 2010*

**3rd grade**

24
*September 9, 2010*

**math**

(x/8)+ (x/8)= 9/8
*September 5, 2010*

**idk, math i guess**

is it 1/3
*July 14, 2010*

**idk, math i guess**

its not homework a family bet.....thnk you
*July 14, 2010*

**idk, math i guess**

my uncle said wat is the anwser please (he is a middle school drop out)
*July 14, 2010*

**idk, math i guess**

ms sue
*July 14, 2010*

**idk, math i guess**

my uncle is to lazy to reduce wat is the finished product plzz
*July 14, 2010*

**idk, math i guess**

thnks !!!!
*July 14, 2010*

**idk, math i guess**

if the average person drinks 8(8 oz.) glasses of warter per day,rather than a person who drinks 12 8 oz. of warter after a morning excersise session has consumed what fraction of the daily average?.
*July 14, 2010*

**Chemistry Honors 10th **

How much heat is required to warm 122 g of water by 23.0 degrees Celsius?
*April 21, 2010*

**math **

what fraction of 1 liter is 1 milliliter?
*February 5, 2010*

**8th grade**

how does a rodeo star get around
*October 6, 2009*

**math**

i am a three-digit number. i am made up of three different numerals. i am divisble by eleven.
*September 10, 2009*

**math**

The sum of what 2 prime numbers equals 16?
*January 4, 2009*

**math**

1).Write the first five terms of the sequence whose nth term is -10n-1. 1ST_ 2ND_ 3RD_ 4HT_ 5TH_
*December 11, 2008*

**Math**

What is the cardinal number for the follwing sets? 1). 101,102,103,104,....121 2). (1,2) (101,102) (0,105)
*December 11, 2008*

**Math**

What is the cardinal number for the following sets? A) 101,102,103,104,.......121 B) (1,2), (101,102), (0,105)
*December 11, 2008*

**math**

what is 121 divided by 4(8 - 2)!
*October 18, 2008*

**Math**

Which best describes the relationship between the lines with equations 8x+y=6 and 16x+2y=0 (a) perpendicular (b) parallel (c) same line (d) neither parallel nor perpendicular
*September 4, 2007*

**fractions URGENT!!!!!!!!!!!!!!!**

Is 2/3 the smallest out of 1/3? Are you asking if 2/3 is smaller than 1/3? If that's your question, the answer is no. If that's not your question, please rephrase so teachers will understand. Thanks. =)
*February 26, 2007*

**simple intrest**

I got 834, and 1.70 write down that answer and write me back and tell me if its right my daughter asked me for help but i really don't get it please tell me if its right
*February 20, 2007*

**chemistry**

I have to find the weight percent of Na2Co3 for my lab report that's due tomorrow but I have no idea how to do it. In the lab I had to wdight 0.4 g of the unknown soda ash sample into an erlenmyer flask and add about 50 mL of deionized water. Then I had to add 2 drops of ...
*September 20, 2006*

**chemistry**

The KHP used in the titration with NaOH was contaminated with sodium hydrogen phyhalate (NaHC8H4O4), but you didn't know it. State the effect of the final result (falsely high, falsely low, or unaffected) Explain. thanks These problems must be reasoned through. (1)mols KHP...
*September 20, 2006*

**chemistry**

HCl is titrated with NaOH. When doing the titration, some of the NaOH splashed onto the inside surface of the Erlenmyer flask, and you forgot to rinse it into your sample. Would the systematic error be falsely high, low, or unaffected and why? Thanks. As I understand the ...
*September 17, 2006*

**chemistry**

We are determining the molarity of HCl by titration of HCl. What would be the complete equation and the net ionic equation? THanks What are you titrating it with? Won't that make a difference in the equation we write? It's titration of HCl with NaOH. molecular equation...
*September 17, 2006*

**chemistry**

If a solution of 0.10 M silver nitrate, AgNO3, is slowly added to a solution containing 0.010 M potassium iodate, KIO3, and 0.20 M sodium bromate, NaBrO3, what precipitate will form first. Will this precipitate form nearly completely (99%) before the second precipitate starts ...
*September 13, 2006*

**chemistry**

The percentage of phosphourus in a detergent product may be determined by sample treatment including the precipitation of magnesium ammonium phosphate MgNH4PO4*6H2O (MW=245.41), using an excess of both magnesium and ammonium ions. The separated ans washed precipitate is then ...
*September 12, 2006*

**chemistry**

Calculate the ionic strength of the solution. a) 100 mL of 0.8M magnesium perchlorate, Mg(ClO4)2, is added to 900 mL of 0.30M perchloric acid, HClO4. No reaction. B)25 mL of 0.200M potassium iodide, KI, are mixed with 75 mL of 0.0300 M silver nitrate, AgNO3. Silver iodide ...
*September 8, 2006*

**chemistry**

HCL is tritrated with NaOH. KHP is then added. A possible source of systematic error in this experiment is failure to dry the KHP. If this occured, would the final wt% NA2CO3 be falsely high, falsely low, or unaffected. Give reasoning. Thanks. You have left out much of the ...
*September 6, 2006*

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