# Posts by heidi

Total # Posts: 131

**math**

if tammy can clean 1/2 the area in an hour by herself and melissa can clean 1/3 the area by herself in an hour then how long will it take them to clean the area together.

*December 1, 2016*

**math models**

Martin invested $6,500 in a bank at a simple interest rate of 6.5%. How much interest would he receive after 4 years? Use I=PRT

*October 6, 2016*

**Math**

1.64 as a mixed number in simplest form

*August 30, 2016*

**Math**

What is 5/6 of 1/2

*May 1, 2016*

**Algebra**

Simplify by reducing (4y^2z^3-8yz^2)/(yz^2-2z)

*April 5, 2016*

**geometry**

a parabola whose axis is parallel to the y axis passess through the points {1,1), (2.2) and (-1,5). Find the equation of the parabola

*December 30, 2015*

**Physics, Statistics**

Consider a series of 8 flips of a fair coin. (a) Calculate the probabilities for obtaining 0-8 heads. We will consider each of these nine outcomes to be macrostates of the system. (b) Calculate the entropy for each of these macrostates. I was able to figure out part A, but I&#...

*December 4, 2015*

**Algebra I**

It is the formula my teacher gave me so I suppose that's what I'm supposed to do. Thank you.

*October 21, 2015*

**Algebra I**

Tommy owes 3000 on his credit card. He is paying 14.5% interest compounded monthly. If it takes him 4 years to pay off the balance, what was the total amount that he ended up paying. Okay, so it gives me the equation a=p(1+r/n)^nt I did 3000(1+.145/12)^48 and got $5339.52 Is ...

*October 21, 2015*

**Chemistry**

How many atoms are in 448 grams of carbon?

*September 28, 2015*

**Physics**

suppose you want to design a capacitor that uses mica as the dielectric material which has K = 7 and a dielectric strength of 150 MV/m. It is intended to store at least 1.- J of energy and be able to withstand a voltage up to 250 volts without electric breakdown. a) What is ...

*September 16, 2015*

**Physics**

suppose you want to design a capacitor that uses mica as the dielectric material which has K = 7 and a dielectric strength of 150 MV/m. It is intended to store at least 1.- J of energy and be able to withstand a voltage up to 250 volts without electric breakdown. a) What is ...

*September 16, 2015*

**Physics**

Consider the following model for the electrostatic stretching of DNA. A spring with spring constant kDNA = 250 pN/m is tethered to an immobile surface on one end and a charge of qDNA = −350e on the other. A uniform electric ﬁeld of magnitude |E| = 2.5 N/C is ...

*September 3, 2015*

**In need of algebra help!**

You are making a rectangular table. The area of the table should be 10 ft^2. You want the length of the table to be 1 ft shorter than twice its width. What should the dimensions of the table be? Okay, so, I'm not sure how to put this into an equation. The example in the ...

*March 30, 2015*

**Math**

Andrew has a combination of 8 quarters, dimes and nickels that add up to a value of 95 cents. How many of each coin does Andrew have?

*March 27, 2015*

**Math**

a basketball tournament starts with 64 teams. after one loss the team is out. how many games does the team that wins the tournament have to play? 64/2=32 32/2=16 16/2=8 8/2=4 4/2=2 2/2=1 The answer is 6 games. How would I write the number sentence?

*March 17, 2015*

**math**

The ratio of one side of a polygon to the corresponding side of a similar polygon is 5:8 The perimeter of the second polygon is 96. What is the perimeter of the first polygon.

*February 5, 2015*

**math**

what is the base 10 of 469 3rd grade

*August 21, 2014*

**Statistics/Probability**

The life span of a calculator has a normal distribution with a mean of 60 months and a standard deviation of 5 months. If a calculator is randomly selected, find the probability that the calculator has a life span of. (1) more than 50 months (2) between 4 years and 6 years.

*July 10, 2014*

**Statistics/Probability**

The probability the New Year's day is on Saturday is a randomly chosen year is 1/7. 15 years was chosen randomly. Find the probability that, (1) Exactly four of these years have a New Year's day on a Saturday. (2) At least two of these years have New Year's day on ...

*July 9, 2014*

**Statistics**

The life of an electric light bulb is known to be normally distributed with a mean of 2000 hours and a std. of 120 hours. Find the probability that the life of such a bulb would be. (a) greater than 2150 hours (b) within the range of 1850 hours to 2090 hours

*July 8, 2014*

**statisticss**

The time taken by a man to deliver milk is normally distributed with, mean 12 minutes and standard deviation 2 minutes. He delivers milk everyday estimate the probability that he takes. (a) longer than 17 minutes (b) between 9 and 13 minutes

*July 8, 2014*

**Math (statistics)**

In an examination a candidate is given the four answers to four questions but is not told which answer applies to which question. He is asked to write down each of the four answers next to its appropriate question. b). show that there are 6 ways of getting just two answers in ...

*July 8, 2014*

**Statistics**

An unbiased die is thrown seven times. Find the probability of throwing it at least five six's.

*June 30, 2014*

**math**

In an examination a candidate is given the four answers to four questions but is not told which answer applies to which question. He is asked to write down each of the four answers next to its appropriate question. b). show that there are 6 ways of getting just two answers in ...

*June 30, 2014*

**Chemistry**

A butane lighter had a mass of 24.643 grams before lighting and a mass of 24.592 grams after. How many mL of CO2 were produced? Assume STP.

*June 9, 2014*

**Chemistry**

5.2 grams of magnesium metal are place in 400.0 mL of 1.0 M hydrochloric acid. The balanced equation for the reaction is: Mg + 2HCl = MgCl2 + H2. How many moles of H2 gas were produced?

*June 9, 2014*

**math**

what means out of 100?

*December 20, 2013*

**math**

brick= (3/4)+(3/4) brick=(6/4)=1.5

*November 11, 2013*

**calculus**

27 ft of wire is to be used to form an isosceles right triangle and a circle. Determine how much of the wire should be used for the circle if the total area enclosed is to be a minimum? Maximum?

*November 11, 2013*

**algebra**

you invest $2800 in an account that pays an interest of 5.5%, compounded continuously. calculate the balance of your account after 12 years.

*August 6, 2013*

**math**

Decrease

*May 18, 2013*

**math**

40% to 525 what is original amount.

*May 18, 2013*

**science**

A satellite completes one revolution of a planet in almost exactly one hour. At the end of one hour, the satellite has traveled 2.0 × 107 meters and is only 10 meters away from its starting point. What is the numerical value of the satellite's average velocity after ...

*April 11, 2013*

**Physics**

Thank you so much... Huge help

*March 6, 2013*

**Physics**

Calculate the ratio of the drag force on a jet flying at 1049 km/h at an altitude of 10.0 km to the drag force on a prop-driven transport flying at 560 km/h and at an altitude of 5.00 km. The density of air is 0.380 kg/m3 at 10.0 km and 0.670 kg/m3 at 5.00 km. Assume that the ...

*March 6, 2013*

**Physics**

A block with mass m = 16.1 kg slides down an inclined plane of slope angle 24.3o with a constant velocity. It is then projected up the same plane with an initial speed 3.35 m/s. How far up the incline will the block move before coming to rest?

*March 6, 2013*

**Physics**

Two blocks with masses m1 = 1.40 kg and m2 = 3.00 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.390.In the figure m1 is on top of a horizontal table ...

*March 6, 2013*

**Statistics**

A unbiased die is thrown seven times. Find the probability of throwing at least five six's.

*March 3, 2013*

**health**

When a person has episodes of hypomania that shift back and forth with mild depression for at least two years, he or she has what form of bipolar disorder? A. BP-NOS B. Cyclothymic Disorder C. Bipolar I Disorder D. Bipolar II Disorde A?

*February 25, 2013*

**health**

In 2004, which ethnic or racial group was at a lower risk of suicide for people ages 65 or older? A. Hispanics B. Asian and Pacific Islanders C. Non-Hispanic Blacks D. Non-Hispanic Whites c

*February 14, 2013*

**Physics**

A downward force of 5.1 N is exerted on a -7.3 mcirco C charge. What is the magnitude of the electric field at this point?

*February 9, 2013*

**math**

Mine was wrong this is my husbands work. I am having a hard time understanding this math. (daughters 5th grade).Does place value start to the right of the decimal with tens?

*January 15, 2013*

**math**

I'll try.... 17; 17.001; 17.107; 17.11

*January 15, 2013*

**math**

can you put the following nmbers in order form least to greatest? 17.11; 17.107; 17; 17.001

*January 15, 2013*

**business math**

sam buys a $10,000.00 teasury bill at 5 1/2% what is the effective ratr?

*October 1, 2012*

**math**

if two angles are supplementery and one is 48 degrees more than 3 times the other what is the measure of the smaller angle

*September 16, 2012*

**organic chemistry**

how to calculate the % oil of thyme in thyme ? We did an experiment titled : the extraction of Thymol in thyme oil and the prof wants us to calculate the % oil of thyme in thyme... how do I do that ? Thanks

*June 17, 2012*

**organic chemistry**

how to calculate the % oil of thyme in thyme ? We did an experiment titled : the extraction of Thymol in thyme oil and the prof wants us to calculate the % oil of thyme in thyme... how do I do that ? Thanks

*June 17, 2012*

**organic chemistry**

how to calculate the % oil of thyme in thyme ? We did an experiment titled : the extraction of Thymol in thyme oil and the prof wants us to calculate the % oil of thyme in thyme... how do I do that ? Thanks

*June 17, 2012*

**Organic chemistry**

If the aspirin crystals were not completely dried before the melting point was determined, what effect would this have on the observed melting point ?

*June 9, 2012*

**algebra**

How do I divide 3sqrt40 by 3sqrt5?

*June 2, 2012*

**psy**

17. <11{6[1(07)71]}> The higher the price of an antique, the greater people’s expectation that the object is rare. That, in turn, makes the antique appear more valuable. If the statements above are correct, then offering an antique for sale at a bargain price (...

*April 2, 2012*

**psy**

<11{6[1(07)71]}> The higher the price of an antique, the greater people’s expectation that the object is rare. That, in turn, makes the antique appear more valuable. If the statements above are correct, then offering an antique for sale at a bargain price

*April 2, 2012*

**Math**

The length of a rectangle is 10cm greater than the width. The area is 551cm^2. Find the length and width

*March 9, 2012*

**Math**

x^2+bx+45, Find the value for b such that the trinomial is a square

*March 8, 2012*

**math**

Mr.Shea saved $2,500 in April. His monthly salary is Twice the amount he saved in April. In May, he saved a certain amount of money.He spent $4,200 more than the amount he saved. How much did he save in May.

*December 7, 2011*

**math**

you have a 20 x 20 area and you have 4 14 foot fences plus 4 4 foot fences and you need to house 9 dogs and none can be together how do you do it?

*November 18, 2011*

**Chemistry**

Beginning with the ideal gas equation show how density of a vapor may be determined? I have so far: n = (PV)/(RT) d= m/V n= m/MW by rearranging i get d = P(m/MW)/RT

*October 18, 2011*

**English**

MLA has updated. Now you have to include what sort of medium was used. in this case you should end with Print if a print source or Web if a web source. The other piece might be in the teacher asked you to include the url.

*October 1, 2011*

**algebra**

im just looking for problem set up

*September 16, 2011*

**algebra**

the number of students is 150 more than adults, the student tickets are $3 and adult tickets are $5 the total sales was 4730 how many students attended

*September 16, 2011*

**Chemistry**

How many grams of hydrogen can be produced by the electrolysis of water with a current of 0.290 A running for 5.00 min?

*August 17, 2011*

**english/phonlogy**

I need help in a project. I'm teaching a group of german students and I have noticed they say things like 'dis' and 'lai' instead of 'this' and 'lie'. I should identify the phonology problem and explain it precisely what it is. Please, can ...

*July 6, 2011*

**arithmetic**

WHAT IS THE ARITHMETIC MEAN OF 3, 5, 7, 9 AND 11

*June 29, 2011*

**discrete math**

Fill in the blanks: For all sets A and B, if A is in the set of B, then A union B in in the set of B. Proof: Suppose A and B are any sets and A in in the set of B. [we must show that __________] Let x be and element of _______. [we must show that __________] by definition of ...

*April 15, 2011*

**Chemistry**

225g

*March 19, 2011*

**microbiology**

Which are the two other pathways necessary to obtain enough energy to accomplish the task?

*February 26, 2011*

**Chemistry**

To what volume should you dilute 50.0 mL of a 4.50 M KI solution so that 28.5 mL of the diluted solution contains 2.75 g of KI?

*January 21, 2011*

**english**

Thank you very much!!! The verb tenses are both present perfect?

*November 29, 2010*

**english**

or this... When a student has chosen to continue his or her education, her or she has started towards being financially secure in life.

*November 29, 2010*

**english**

When a student has chosen to continue their education, they have started towards being financially secure in life. Is that better?

*November 29, 2010*

**english**

When a student has chosen to continue their education, they have also started towards being financially secure in life. has chosen is part tense participle Is "have also started" present perfect tense?

*November 29, 2010*

**Physics**

Beatrice throws the 1st calculator straight up from the edge of the roof of a building. She drops a 2nd calculator off the side of the building 2 seconds after she has thrown the first one. If the height of the building is 40m, what must the initial upwards velocity of the 1st...

*November 12, 2010*

**PHysics**

.) Bailey has taken up parkour. She attempts to clear the gap between two buildings. Bailey is on a roof which is 50m high and she is attempting the jump to a building that is 42m high. a.) If the two buildings were built touching (i.e. there is no gap) How long would it take ...

*November 12, 2010*

**Physics**

.) Beth launches a rocket out in the courtyard. It stays in the air for 7.25 seconds before coming back down. a.) How high did it get? b.) With what velocity did it hit the ground upon returning to Earth? c.) What is its rate of acceleration as it slows down, reaches the peak ...

*November 12, 2010*

**world history**

how do i do a report that is due in 2 day that is on the 5 themes of geography and has to do with a current event i need help and i am having a break down how can i work like this HHHHHEEEEEELLLLLLLPPPPPPP ME

*November 2, 2010*

**Algebra**

A single-engine airplane carries enough fuel for an 8-hour flight. After the airplane has been flying for 1 h, the fuel tank begins to leak at a rate that would empty the tank in 12 h. How long after the leak begins does the plane have until it runs out of fuel?

*November 2, 2010*

**Math**

A cyclist and a jogger start from a town at the same time and head for a destination 11 mi away. The rate of the cyclist is twice the rate of the jogger. The cyclist arrives 1.1 h before the jogger. Find the rate of the cyclist.

*November 2, 2010*

**medicine**

What is a unit price and where is it found on?

*July 11, 2010*

**Com220**

Measuring the quality of care is essential to being able to identify which areas of patient care need improvement. A positive patient outcome is one measure of quality. What role do health care workers play in determining quality care?

*June 21, 2010*

**3rd grade math**

Mrs.Rossi wrote the following clues for a mystery number: •It is a 4 digit number •The tens are double the ones. •The thousands are double the tens. •The sum of the digits is 19. What number is it?

*April 27, 2010*

**Physics**

3000 Joules of energy in the form of heat are added to a copper block with a mass of 1 kg. What is the blocks temperature change?

*April 24, 2010*

**algebra**

Evaluate and tabulate the values of y for the given values of x. Tabulate your answer in the form of ordered pairs (x, y). y = 2x, for x = -2, -1, 0, 1, 2

*February 28, 2010*

**english**

Maya Angelou was a singer, actor, civil rights worker, journalist, and director. She was been through so much and has transcended into one of the world’s most famous authors. Out of all her past occupations, she is best known for her literary works.

*February 24, 2010*

**english**

thanks so much

*February 24, 2010*

**english**

I need help with my annotated bibliography thesis for Maya Angelou!!!!!!!? It is for a research paper. I has to include a bibliography of Maya Angelou and 3 of her works. I just need help with the thesis for the annotated bibliography.

*February 24, 2010*

**math**

I think it would be 30000000km^3

*February 21, 2010*

**PHYSICS**

A charged disk of radius R that carries a surface charge density ó produces an electric field at a point a perpendicular distance z from the center of the disk, given by: Consider a disk of radius 10 cm and positive surface charge density +3.7 mC/m2. A particle of ...

*February 11, 2010*

**reimbursement methodolgies**

You're reviewing reimbursement for a Medicare surgical craniotomy case. The case falls into DRG 1, which has a relative weight of 3.0970 and a geometric mean LOS of 6.3. The hospital's current standard reimbursement rate is $1500. Calculate the DRG reimbursement for ...

*January 26, 2010*

**Computers**

I have to generate OOP code for a system that tracks my CDs and DVDs. I have gotten through the defining of class and subclass and don't know what to do next. Do I need to create the records and then sort?

*December 18, 2009*

**psychology**

factors that enhance or impede information flow in each step of the process

*December 5, 2009*

**biology**

What is the difference between genetic mutation and transgenic organisms?

*September 27, 2009*

**business statistics**

For the following independent random samples, use the z-test and the 0.01 level of significance in testing as an approximation to the unequal variances t-test when comparing two sample means? H0: µ1 = µ2 versus H1: µ1 ≠ µ2. x¯1 = 33.5 s1 = 6....

*August 4, 2009*

**business statistics**

A sample of 40 investment customers serviced by an account manager are found to have had an average of $23,000 in transactions during the past year, with a standard deviation of $8500. A sample of 30 customers serviced by another account manger averaged $28,000 in transaction...

*August 4, 2009*

**2nd grade english**

Need ideas on how getting an education is so important for children. please answer. Thx

*July 25, 2009*

**Science**

Can anyone find a site that gives all the general types o0f human cells/

*June 30, 2009*

**PSY 210**

Need help with this paper

*June 29, 2009*

**PSY 210**

paper summarizing each phase of the sexual response cycle for males, females, and commonalities for both males and females. Include a brief description of any sexual dysfunctions which can occur and common methods of treatment.

*June 29, 2009*

**Marketing 230**

How does an organization establish an IMC plan? What are some of the different stages that company goes through when developing their IMC strategy?

*June 29, 2009*