Sunday

October 23, 2016
Total # Posts: 1,119

**algebra**

In an experiment, the population P of bacteria is given by P=1000e^kt,where k is constant.If the size of population bacteria is found to be 3000 after 10 hours, what is the size of the population after 5 hours?Show me the solution please.

*October 10, 2016*

**English**

Thank you for the link, I checked it out, however I still have trouble finding the symbols. I think that the moon and stars could be symbols in the play, as they are mentioned several times, however I'm not sure what they could represent.

*September 30, 2016*

**English**

What symbols are present in the poem, Salt Water Moon, by David French?

*September 30, 2016*

**PHYSICS PLEASE HELP**

Find the electric field on the axis of a uniformly charged solid cylinder, at a distance z from the center of the cylinder. The length of the cylinder is H, its radius is “a”, and the charge density is ρ. (Assume that z > H/2).

*September 28, 2016*

**Pre-Calc 20**

**EDIT** A rectangle has a diagonal of 18cm. The diagonal creates a 60 degree angle at the base of the triangle. Write an exact expression for the base and the height of the triangle. My teacher wants the base and height answered in roots so do you think you could switch the ...

*September 23, 2016*

**Pre-Calc 20**

A rectangle has a diagonal of 18cm. The diagonal creates a 60 degree angle at the base of the triangle. Write an exact expression for the base and the height of the triangle.

*September 23, 2016*

**Math**

My car gets 24 miles per gallon I put 15.1 gallons of gas in my tank how many miles can I drive on 15.1 gallons of gas?

*September 22, 2016*

**Sciene Degree**

Pressure, P, is directly proportional to temperature,T, and P is 28 lb per square inch when T is 112 degress Kelvin. What is the pressure when the temperature is 124 degrees Kelvin? If required, round answer to three decimal places. _____lbs per square inch.

*September 10, 2016*

**Math**

Thank you so much! Oh, and I checked and the first problem doesn't contain a typo.

*September 8, 2016*

**Math**

Hello, I need help solving two systems of equations. I'm not sure how to solve them. They are: 7w+e=8 e+5=9 And the second one is: 7e=107-6d 7e+8d=117 Thanks!

*September 8, 2016*

**Physics**

a ship is headed towards east at a thrust speed of 7.00 knots. A strong wind pressure causes the ship to deviate to the north at 1.00 knots. The sea current is flowing to the southwest at 4.00 knots. Determine the velocity of the ship relative to the earth's surface.

*September 8, 2016*

**English Grammar**

My English question asked if a topic sentence should be short or long.(true or false) I don't know how to answer this question. is this question false.

*July 16, 2016*

**English**

Just a question Can a topic sentence be short?

*July 16, 2016*

**English**

A topic sentence should be very long. 1. True 2. False Please recheck my answer. I say True

*July 16, 2016*

**English**

All sentences in a paragraph must relate to the idea that the topic sentence in the paragraph introduces. 1.True 2. False I say true. Please recheck my answer.

*July 16, 2016*

**Algebra**

coffee shop sells small and large coffee. Each day they sell 510 cups of coffee. If the shop sells 3 times as many large cups as small cups of coffee, How many cups of each size do they sell daily?

*July 14, 2016*

**English**

Thank you Ms. Sue

*July 9, 2016*

**English**

In academic writing, introductions must include a thesis statement. 1.True 2.False I think it true, please recheck my work

*July 9, 2016*

**English**

A brief, concise introduction can be effective. 1.True 2.False I think its true, please recheck my answer.

*July 9, 2016*

**English**

Which of the following is unimportant for an introduction in formal or academic writing? 1.Entertaining the audience 2.Establishing the key point the piece of writing will make. 3.Discussing your opinion on the topic for at least three sentences. 4.Providing all of the ...

*July 9, 2016*

**chemistry 12u**

so is it -log^(2.73) ? for some reason my calculator wont calculate it

*May 10, 2016*

**chemistry 12u**

how do i calculate this.. a solution of nitrous acid has a pH of 2.73 what is the [H3O+] ?

*May 10, 2016*

**math**

Suppose the daily high temperature in a town is 3 degrees above average one day, then 5 degrees below average the next day, then 2 degrees above average, then 1 degree below average, then 6 degrees above average, then equal to the average the next day. Find the mean deviation ...

*May 4, 2016*

**Math**

Isaac throws an apple straight up (in the positive direction) from 1.0 m above the ground, reaching a maximum height of 35 meters. Neglecting air resistance, what is the ball’s velocity when it hits the ground?

*April 18, 2016*

**interest**

Find the balance on an account if you invest $100 at 5% for 10 years compounded monthly.

*April 17, 2016*

**interest**

Find the balance on an account if you invest $100 at 5% for 10 years compounded annually.

*April 17, 2016*

**math**

The student to teacher ratio is 19:1 at a local school and there is a total of 500 students and teachers. How many teachers and how many students are there. I'm not sure how to begin to set this up since I have two unknowns and not only one.

*April 11, 2016*

**Math**

If pasta sells for $3.55 for a 20-ounce box a. What is the price per ounce? Round to the nearest cent. $3.55/20 = $.18 per ounce b. How many ounces do you get per dollar? Round to the nearest tenth of an ounce. I'm not sure how to solve this answer. Thank you.

*April 11, 2016*

**Physics **

A box slides down a frictionless, 10-meter, 30o incline. Calculate the gravitational potential energy at both the beginning and end of the motion. Calculate the work done by GRAVITY as the box slides down the incline. Compare this to the overall change in gravitational ...

*March 22, 2016*

**Math**

I think you would take your final answer and divide? I might be wrong tho

*March 19, 2016*

**Science**

Name each compound by ionic, hydrogen, or molecular compound and name the following? Im stuck on these! help please!! 1- Al2S3 2- SrI2 3 - CL2O5 4 - FeCl2 5 - BeH2

*March 6, 2016*

**Chemistry **

Name each compound by ionic, hydrogen, or molecular compound. And name the following? 1- P2O3 2 - MnO2 3 - Al2S3 4 - SO3 5 - NH3 6- SrI2 7 - CL2O5 8 - FeCl2 9 - BeH2

*March 6, 2016*

**Social Studies**

oops, switched. TESSA is right

*February 26, 2016*

**Social Studies**

idk, but 13 a, 14 d?

*February 26, 2016*

**Business**

Price auction on ebay are an exampke of a. e-business B. Information C. Entertainment D. Communication my answer is a. e-business Please help me

*February 12, 2016*

**Calc**

A ball is launched straight up from the edge of a cliff that is 250 m high. The ball's motion is given by s = 35t - 4.9t^2 where s is the ball's height in meters above the cliff top at time t seconds. With what velocity does the ball strike the ground at the base of ...

*February 9, 2016*

**Maths lit, economics, lifesciences, agriculture, lifeorientation, sepedi, english**

What career path should i follow

*February 6, 2016*

**Math**

What is the final price of a $24 sweatshirt if there is a 20% discount applied and then a 7% sales tax added?

*February 5, 2016*

**Statistics**

If a teacher is grading on a curve, the median is 78 and the standard deviation is 9.6, how do i find out the ranges for grades? ex, an A is the top 15% of the curve. I know it has to do with the z score and that is the # of standard deviations the score is from the median, ...

*February 3, 2016*

**Birthday**

Thank you Reed and thank you MS. Sue

*January 23, 2016*

**Birthday**

HI Ms.Sue i didn't know my mom did this but thank you so much for everthing

*January 23, 2016*

**Birthday**

Today is my daughters birthday .Thank you for helping her with her homework.Thank you Ms.Sue aslo she really like you, her name is Kaylah.

*January 23, 2016*

**Math**

The length of a rectangle is 8 cm longer than its width , if the perimeter is 84 cm , what is its area

*January 20, 2016*

**Math**

The length of a rectangle is 8 cm longer than its width , if the perimeter is 84 cm , what is its width

*January 20, 2016*

**Math**

A student got 70% on the first test She got 77% on the second test What is the percent increase ? This was all that was given in question

*January 18, 2016*

**math**

Marisa invests $1650 for 3 years, at which time her investment is worth $2262.7. What interest rate , compounded annually, would yield the same results? Found your answer to 2 decimal places.

*January 13, 2016*

**geography**

All of the following are a kind of government EXCEPT a(n).... (a)direct monarchy (b)oligarchy (c)city-state (d)absolute monarchy I am not sure but I think it is absolute monarchy.....

*January 5, 2016*

**Math**

Find the total area between y=x+12 and Y=3x+1 between x=0 and x=2.

*November 29, 2015*

**history**

were Helen Keller and John Reed more or less patriotic than United States soldiers who fought in the military during the war? Explain.

*November 8, 2015*

**chemistry **

Given two liters of 0.496M KCl describe how you would use this solution to prepare 250.0 ml of 0.175M KCl.

*November 7, 2015*

**Math**

how many times do the graphs of y=3sinx and y=3sin3x intersect for x in the interval [0, 2012]

*November 6, 2015*

**algebra**

thank you

*November 2, 2015*

**algebra**

you are buying orange juice for $4.50 per container and have a gift card worth $7. TheFunction f(x)=4.50x-7 represents your total cost f(x) if you buy x containers of orange juice and use the gift card. How much do you pay to buy 4 containers of orange juice? Is this correct: ...

*November 2, 2015*

**Math**

Thank you!!!

*October 29, 2015*

**Math **

Sarah starts at a point 26 miles from school and runs toward school at 6 miles per hour. Ryan starts from school 1.3 hours later and runs towards Sarah at 8 miles per hour. Let x be the number of hours Sarah has been running Write an expression in terms of x for the distance ...

*October 29, 2015*

**Math**

My professor gave our class a study guide for our midterm. On that study guide, there were 10 prompts he wanted us to know. Out of the 10, there were 3 prompts that I wasn't confident in. For the midterm, he picked 5 prompts out of the 10. Out of those 5 prompts, 3 of the ...

*October 23, 2015*

**Calculus**

Estimate the relative rate of change of f(t)=5t^2 at t=4. Use change of 0.01.

*October 20, 2015*

**Algebra**

Suppose that you deposit $1735.50 in a savings account that pays 9.25% annual interest with interest created to the account at the end of each year. Assuming no withdrawals are made, find the balance in the account after 4 years

*October 18, 2015*

**Math**

A number is chosen at random from among all 5-digit numbers containing only the digits 1,2,3,4, and/or 5. Find the probability that the digits are all different.

*October 17, 2015*

**logarithm**

If log base 2 of x and log base 2 of y are distinct positive integers and log base x of 2 plus log base y of 2 equal to 0.5. xy=?

*October 17, 2015*

**Calculus**

6e^3t=9e^2t

*October 13, 2015*

**Calc**

6e^3t=9e^2t

*October 13, 2015*

**Math**

A round silo is 55 feet tall and has a 18 foot radius. How high would a load of 31000 cubic feet of grain fill the silo?

*October 7, 2015*

**Math**

A country's Consumer Price Index (CPI) is a measure of the cost of living. The inflation rate is the annual relative rate of change of the CPI. Use the data in the following table to estimate the inflation rate for each of years 2007–2012. Year 2007 CPI 202.077 Year ...

*September 30, 2015*

**Math**

Distribution of exam 2 scores is unimodal and symmetric with a mean of 78 and a standard deviation of 4.6 points. What exam score corresponds to z- score of -2.46

*September 27, 2015*

**Algebra**

Using two lawnmowers and working together Tom and Anne can mow the lawn in 36 minutes. It takes Anne 90 minutes if she mows the lawn herself. How long would it take Tom to do the job working alone?

*September 24, 2015*

**Math**

If you deposit 10,000 every year into an account paying 5% interest compounded annually, how long will it take to accumulate 1,000,000?

*September 20, 2015*

**Math**

Find the effective rate of interest for 5% compounded monthly.

*September 18, 2015*

**Math**

Carletta has 23000 dollars to invest. As her financial consultant, you recommend that she invest in Treasury Bills that yield 7%, Treasury Bonds that yield 8%, and corporate bonds that yield 9%. Carletta wants to have an annual income of 1800 dollars, and the amount invested ...

*September 14, 2015*

**math**

that is what I thought thank you!

*September 2, 2015*

**math**

How do I work 2s^3-4r^2 if s=5 and r=1?

*September 2, 2015*

**Physics **

A 60-kg soccer player kicks a stationary 0.4 kg ball giving it a speed of 14 m/s. The player's foot is in contact with the ball for 0.08 second. What is the average force on the ball?

*August 31, 2015*

**Physics **

A 60 kg soccer player kicks a stationary 0.4 kg ball giving it a speed of 14 m/s. The player's foot is in contact with the ball for 0.08 second. What is the average force on the ball? P.S What formula/s should I use?

*August 29, 2015*

**math**

if about 32,680 kilobytes of memory is still available how many more pictures can they take

*August 27, 2015*

**Math 10**

Thank you so much. It really helps me 😂

*August 27, 2015*

**Math 10**

EXPONENTIAL EQUATION Find the X 3^x - 82/9 = -3^-x

*August 27, 2015*

**math**

15, 30,45,60 20,40,60,80 LCM= 60 60 divided by 15= 4

*August 26, 2015*

**Physics**

A newly discovered particle, the SPARTYON, has a mass 895 times that of an electron. If a SPARTYON at rest absorbs an anti-SPARTYON, what is the frequency of each of the emitted photons (in 1020 Hz)? The mass of an electron is 9.11×10-31 kg.

*August 16, 2015*

**Physics**

Take element Z = 24 from the periodic table. Ionize it 23 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the electron?

*August 15, 2015*

**Physics**

An atom is ionized so that it has only one electron. When the electron drops from the n = 6 shell to the n = 1 shell, an X-ray of wavelength 193.76 pm is emitted. What is the atomic number?

*August 12, 2015*

**PHYSICS**

The temperature of the cosmic background radiation is measured to be 2.7 K. What is the wavelength of the peak in the spectral distribution at this temperature? What frequency corresponds to this wavelength?

*August 10, 2015*

**PHYSICS**

Suppose that at least 13.0 eV is needed to free an electron from a particular element, i.e., to ionize the atom. What is the lowest frequency photon which can accomplish this? And, what is the corresponding wavelength for that photon? Give frequency for answer 1 and wavelength...

*August 10, 2015*

**Physics**

Monochromatic light of wavelength, λ is traveling in air. The light then strikes a thin film having an index of refraction n1 that is coating a material having an index of refraction n2. If n2 is larger than n1, what minimum film thickness will result in maximum ...

*August 6, 2015*

**Physic**

A positive charge of 4.90 μC is fixed in place. From a distance of 3.20 cm a from the fixed positive charge, a particle of mass 5.00 g and charge +3.20 μC is released from rest. What is the speed of the +3.20 μC when it is 7.50 cm away from the fixed positive ...

*July 28, 2015*

**science: chemistry**

How many moles of NaOH must be added to 1.0 L of 2.6 M HC3H5O3 to produce a solution buffered at each pH? 1)pH= 4.28 2)pH=pKa

*July 23, 2015*

**science: chemistry**

A buffered solution is made by adding 47.4 g C2H5NH3Cl to 1.00 L of a 0.68 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)

*July 23, 2015*

**Physics **

A bridge is 200 m long. A car weighing 2.5 metric tons is 50 m from one end of the bridge and a trucj weighing 6 metric tons is 80 m from the other end. The bridge is uniformly paved and weighs 20 metric tons. How much force does the vertical support at each end exert?

*July 19, 2015*

**Physics **

A 30-N non-uniform pole, 5m long, was used to carry a load of 400 N by two men. The load was hung at the middle of the pole. Find the center of gravity of the pole if the force exerted by each man on each end were 220 N and 210 N respectively.

*July 19, 2015*

**Physics **

The ends of a rope are tied to two hooks on a ceiling. A set of books weighing 36.0 N is tied and hung on the rope so that the segments of the rope make angles of 35 degrees and 50 degrees respectively with the horizontal. Compute for the tension on each segment of the rope.

*July 19, 2015*

**Physics **

A borad, 3m long, is hinged at point a and is supported by a vertical rope at point b, 2m from a. A boy weighing 200 N stands at the end of the board at point c. Neglecting the weight of the board, calculate the force on the rope.

*July 19, 2015*

**Physics **

A uniform rod 1.2 m long has weight of 1000 dynes and 2000 dynes at its ends. At what point on the rod can it be balanced horizontally if the rod weighs 2500 dynes?

*July 19, 2015*

**Physics **

A weight of 340 N is suspended from a pole by means of a rod 4m long and a rope tied to one end 3m above. Find the tension on the rope the force of the rod.

*July 19, 2015*

**Physics **

A girl weighing 310 N sits on a hammock supprted by two ropes. Each tied 60 degree from vertical posts. What is the tension on each rope?

*July 18, 2015*

**Math**

How much does it cost in dollars to watch the 5.00 hour-long coverage of the Super Bowl on a 115 Watt television set? Assume that one kWh electricity costs 9.41 cents.

*July 14, 2015*

**Physics**

The electric potential at a position located a distance of 20.1 mm from a positive point charge of 6.50×10-9C and 12.1 mm from a second point charge is 1.26 kV. Calculate the value of the second charge.

*July 13, 2015*

**Physics**

Four identical point charges of q = 4.64 nC are at the four corners of a square with a side length of 13.5 cm as shown in the figure. What charge Q should be placed at the center of the square to keep the other four charges in equilibrum?

*July 9, 2015*

**Physics**

Answer True or False to each case. Coulomb's law states that the force between static charges Q1 and Q2 is proportional to Q1 Q2. is proportional to the total charge Q1+Q2. is K Q1Q2/r where K is a universal constant. is proportional to 1/r2. is a force of attraction.

*July 9, 2015*

**geometry**

In triangle ABC, X and Y are the midpoints of BC and AC, respectively. The perpendicular bisectors of BC and AC intersect at a point O inside the triangle. If angle C = 47 degrees, then find the measure of angle XOY?

*June 5, 2015*

**French**

HELP!!

*June 2, 2015*