Thursday

September 29, 2016
Total # Posts: 917

**Physics (Sound)**

Cellist Yo-Yo Ma plays a note at 250 Hz. A studio technician performs an analysis of the frequency spectrum and reports that she measured the SIL of its peaks (those of the frequency spectrum): 63 dB at 250 Hz, 58 dB at 500 Hz, 56 dB at 750 Hz, and 51 dB at 1000 Hz. Assuming ...

*September 22, 2016*

**Maths**

One number is 8 more than twice another number. Find the numbers if their sum is 50

*August 27, 2016*

**Maths**

Moss and Roy both decide to go out for a 2 course dinner. Moss' meal cost twice as much as Roy's meal, however Roy spent $3 more than Moss for his dessert. Moss spent $11 on his desert. The bill came to $75. How much did Roy spend for his meal and dessert?

*August 7, 2016*

**math**

What is the base in the power 9

*August 7, 2016*

**precalc**

Letf(x)=2x2 –5 and g(x)=x+4. (a) Find the composite function ( f o g)(x) and simplify. Show work. (b)Find (f og)(3).Showwork.

*July 7, 2016*

**precalc**

Suppose that cos θ = 12/13 and that θ is a Quadrant IV angle. (a) Find the exact value of sin θ. Show work. (b) Find the exact value of sin 2θ. Show work.

*July 7, 2016*

**precalc**

A projectile is launched from a platform 10 feet high with an initial velocity of 72 feet per second, The height h of the projectile at t seconds after launch is given by h = –16t2 + 72t + 10 feet.

*July 7, 2016*

**maths**

the sum of a number and its square is one and a half times their difference. what is the number?

*June 7, 2016*

**Math**

Thank you

*June 1, 2016*

**Math**

How do I work out this problem 8 3/4 + 2 1/2 please help me.

*June 1, 2016*

**Matt**

The area of a curved surface of a d battery with a diameters of 3.2 centimeters and a height of 5.6 centimeters h

*May 26, 2016*

**Calculus (Integration proving)**

Show that 0 <= [(integral)(integral, r to none)sin(pi)xcos(pi)y dA] <= 1/32 where R = [0,1/4]x[1/4]x[1,2]. Thank you.

*May 20, 2016*

**algebra**

The sum of 3 numbers is 24. Twice the smallest number is 2 less than the largest number and the largest number is equal to the sum of the other two. what are the three numbers?

*April 28, 2016*

**life orientation**

identity you 3 human rights violation

*April 17, 2016*

**Chem**

How many grams of oxygen are there exactly in 100.0 g of carbon dioxide?

*April 5, 2016*

**Mathematics**

A curve is defined parametrically x = 1 - √3 sin(2s) y = cos(2s-1) What is the gradient at s=(pi/6)

*March 2, 2016*

**Mathematics**

Parametric Equations x = 9s^2 - 1 y = 1 - 8s^3 Find the cartesian equation?

*March 2, 2016*

**Math**

Parametric Equations x = 9s^2 - 1 y = 1 - 8s^3 find dy/dx in terms of s find the coordinates of stationary points

*February 28, 2016*

**Mathematics**

Parametric Equations x = 9s^2 - 1 y = 1 - 8s^3 find dy/dx in terms of s find the coordinates of stationary points

*February 28, 2016*

**Math**

A blimp flies at 60mph. A round trip of 40miles into the wind and 40 miles with the wind takes 90 minutes. What is the speed of the wind?

*February 16, 2016*

**Calculus**

An object moves from left to right along a parabolic shaped path y=(1/4)x^2. At the point (-2,1) the speed is 1. What normal acceleration is the object experiencing at that point?

*February 16, 2016*

**physics **

A 82 kg runner with a speed of 5.6 m/s makes a sharp turn with a radius of 1.1 m to avoid a collision. What is the magnitude of the frictional force (in N) the ground exerts on the runner during the turn?

*February 10, 2016*

**physics **

A spring is stretched by 8 cm when a force of 2 N is applied. If a force of 5.8 N is applied, how many additional cm does the spring stretch? would it be 8/2 =4*5.8= 23.2

*February 10, 2016*

**math**

7 kids and 2 adults are going to the circus. Kid's tickets are on sale for only half the price of adult tickets. The total cost is $70. How much is one kids ticket? How much is one adult ticket?

*February 10, 2016*

**Physics **

Calculate the speed with which a swimmer enters water if she slides down a frictionless ramp that is 2.6 m high

*February 8, 2016*

**Is444**

A newspaper carrier has $5.30 in change. He has ten more quarters than dimes but two times as many nickles as quarters. How many coins of each type does he has?

*February 6, 2016*

**farm disease **

explain the mechanisms as test involved in vaccinating birds against a named disease with special infacises on immunity build up

*February 4, 2016*

**farm disease **

illustrating with two named disease, describe their clinical signs and give confirmative diagnoses of each using pathognomic signs

*February 4, 2016*

**genetics **

a man with blue eye married a girl with broun eye and the mother of the girl has blue eye. What is the probability that their children will have blue eye

*February 4, 2016*

**Language**

I mean A

*January 22, 2016*

**Maths**

The 7th term of an a.p is 11 and the nth term is 3. Find the first five term

*January 19, 2016*

**Physical Education**

^you are corrrect

*December 7, 2015*

**Science.**

Because it was part of the three other time periods that basically came together.

*December 2, 2015*

**Mathematics**

Solve tan2x = 5sin2x Giving all solutions in the interval 0 ≤ x ≤ 180°

*November 18, 2015*

**physics**

ChangePE + changeKE = 0. the change in potential energy of electron is = dPE = qdV = (-e)dV. The change in kinetic energy of electron is = 1/2mV^2 - 0 = 1/2mV^2. put these together and get. (-e)dV + 1/2mV^2 = 0. 1/2mV^2 = (e)dV. mV^2 = 2(e)dV. V^2 = 2edV/m. Insert the figures ...

*October 25, 2015*

**Biology**

How much sterile saline would you have to add to add to 0.25 mL of a serum sample in order to prepare 1/50 dilution of the serum?

*October 20, 2015*

**English**

According to An Inconvenient Truth, what is the role of infrared radiation in global warming?

*September 22, 2015*

**hudson ntsan'wisi**

assess the extent to which bad road use has a direct impact on the physical,emotional, social and economic aspects to the family,the community and the country.

*August 27, 2015*

**Psychology**

Dissociation and selective attention are two possible explanations for the phenomenon of

*August 8, 2015*

**math**

85600

*August 5, 2015*

**Algebra 2**

Thank you so much, that was very helpful:)

*July 23, 2015*

**Algebra 2**

Hey, I just have two questions, Thanks. 1. Find the exact solutions of x² - (y - 6)² = 36 and y = -x² 2. Solve the system,4x² + y² = 20 and y = 4x.

*July 23, 2015*

**Geog **

Would someone please help me with this? Or at least tell me the formula I should be using? I've been trying to get help with this for four days now. I'm VERY frustrated. Assume that a parcel of air is forced to rise up and over a 6000-foot-high mountain. The initial ...

*July 9, 2015*

**math **

What is the volume of a regular pyramid having a base area of 24 square inches and height of 6 in

*June 29, 2015*

**grammar**

Which is the correct answer? I think it is A, but would like a second opinion. It was not _____ who left the door unlocked this morning. A. I B. me C. myself

*June 24, 2015*

**grammar**

Which one has the correct pronoun? The team of reporters stunned their audience when the results of the election were revealed. The team of reporters stunned its audience when the results of the election were revealed.

*June 24, 2015*

**chemistry**

1. Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions book for this test. You also may use the formulas on pages 238 243. A student increases the temperature of a 556 cm3 balloon from 278 K to 308 K. Assuming constant pressure...

*June 15, 2015*

**math**

Question 5.5. Sandra throws an object into the air with an initial vertical velocity of 38 feet per second, from a platform that is 30 feet above the ground. How long will it take the object to hit the ground? (Points : 1) 1 second 2 seconds 3 seconds 4 seconds i think its 4 sec

*June 11, 2015*

**math**

Question 5.5. Sandra throws an object into the air with an initial vertical velocity of 38 feet per second, from a platform that is 30 feet above the ground. How long will it take the object to hit the ground? (Points : 1) 1 second 2 seconds 3 seconds 4 seconds

*June 11, 2015*

**math**

Question 2.2. The height of a triangle is 5 m less than its base. The area of the triangle is 42 m2. Find the length of the base. (Points : 1) 12 m 11 m 8 m 7 m i think it's 12m

*June 11, 2015*

**english**

a, it think i figured it out

*June 11, 2015*

**english**

Question 28.28. Identify the sentence that is not punctuated correctly. (Points : 5) "Why did he call you “Bug” just then? Is that your nickname?" she asked. "Wait," she called, "I've still got to find a copy of the poem ‘Fire and ...

*June 11, 2015*

**Algebra**

I'm trying ti find the correlation coefficient for the following: The scores of 10 students on their midterm exam (x) and on their final (y) yielded the following data. Σx = 638 Σx2 = 43,572 Σy = 690 Σy2 = 49,014 Σxy = 44,636 Is the answer 0.547? ...

*June 3, 2015*

**math**

On August 18, Sullivan Company received an invoice in the amount of $6,700, having terms of sale of 4/15 EOM. What is the discount date?

*May 20, 2015*

**anatomy and physiology**

1)Provide the name and chemical symbol of 4 chemical elements you find in the human body. Select 1 of the 4 chemical elements, make the drawing of the atom and label the nucleus, protons, neutrons and electrons. 2)Make a drawing showing the molecular structure (it represents/...

*May 17, 2015*

**Chemistry**

a gas occupies 2 m3 at 100k and exerts a pressure of 100kpa. What volume will the gas occupy if the temperature is increased to 400.0k and the pressure is increased to 200.0kPa?

*May 4, 2015*

**Introduction to business**

2. Ida works on creating ways to ensure that customers receive goods at the right time and correct location. Ida is involved in her firm's ________ strategy. A. pricing B. transportation C. product D. promotion 3. Mario is part of a strategic planning team. He has ...

*May 1, 2015*

**Introduction to business**

1. In which stage of the product life cycle are profits at their highest? A. Introductory stage B. Decline stage C. Maturity stage D. Growth stage

*May 1, 2015*

**math**

What is the root of 345 without the use of tables?

*April 21, 2015*

**physics**

I can answer your question satisfactorily. I can help you with your assignments. Kindly email me midborn71 at g mail dot com for any assistance you may want. Thanks

*April 21, 2015*

**Physics**

The university skydiving club has asked you to plan a stunt for an air show. In this stunt, two skydivers will step out of opposite sides of a stationary hot air balloon 2,500m above the ground. the second skydiver will leave the ballon 20 seconds after the first skydiver but ...

*April 5, 2015*

**Math**

Your store’s average basket (transaction) size for the month of March was $11.50 and you believe the average basket size will remain the same for your store in April. One of your hourly employees had an average basket size of $9.00 for the month of March and averaged 125 ...

*April 1, 2015*

**math**

The apocalypse started in NY where 100 people were infected. From there the zombie apocalypse continued to spread. After 17 minutes the number of people infected 200 people.assume that no human have figured out how to kill the zombie or stop it from spreading for the first 24 ...

*March 15, 2015*

**math**

If you buy two DVDs for $8 each and one poster for for $6 and there was a 40% store discount what was the sales price of the purchase How do I get started I am confused???

*March 3, 2015*

**biology**

Is it 1:keeping the amount of DNA in the cell at a minimum level?

*March 1, 2015*

**biology**

Hello, I got this question wrong on a homework assignment and I still can't find the correct answer. The reduction of the chromosome number during meiosis is most important for: 1: keeping the amount of DNA in the cell at a minimum level. 2: allowing the growth of the cell...

*March 1, 2015*

**Chemistry**

Thank you Dr Bob

*February 27, 2015*

**Chemistry**

True of False, Amorphous solids have crystal structures.

*February 27, 2015*

**math**

compare 2 fractions with different numerators and denominators

*February 8, 2015*

**Spanish 1**

Oops just noticed now I made an error where "el fiesta" is written twice :/

*February 7, 2015*

**Spanish 1**

Please excuse me for this, I know it's not well done but please look it over. Thanks Hola Amigo, Tú son invitado a una dia fiesta Valentines. En mi casa el 14 de Feburero. El fiesta empezie en desayuo y terminars en cena. Llevar los pijamas a el fiesta a el fiesta...

*February 7, 2015*

**English**

How about, "The disgusting meals of Hard Luck Airlines convinced us to return by ship."

*February 7, 2015*

**algebra **

Annie is two years more than three times as old as her son, Jared. If the difference between their ages is 26, how old are Annie and Jared?

*January 13, 2015*

**Spanish 1**

Wow okay, thanks ill have to look it over closely and change it.

*January 10, 2015*

**Spanish 1**

Thanks

*January 10, 2015*

**Spanish 1**

El Taco Barato Restaurante es un lugar en centro. Mis amigos y yo comimos allí la semana posada. La comida Fue muy barata. Los camareros no deseó trabajar. Pedí un plato especial, el taco pescado. Fue cinco dólares, y uinió con un refresco. ...

*January 10, 2015*

**MATH**

Julia and Kevin are playing games at the arcade. Julia started with $15, and the machine she is playing costs $0.75 per game. Kevin started with $13, and his machine costs $0.50 per game. After how many games will these two kids have the same amount of money remaining? Set up ...

*January 8, 2015*

**PHYSICS**

An automobile accident investigator needs to determine the initial westerly velocity of jeep (m=1720 kg) that may have been speeding before colliding head-on with a Volkswagen (m=1510 kg) that was moving with a velocity of 75.7 km/h east. The speed limit on this road is 90 km/...

*December 27, 2014*

**Spanish 1**

Okay ill have to change that, thank you for looking that over.

*December 19, 2014*

**Spanish 1**

Thank you :)

*December 19, 2014*

**Spanish 1**

¡Hola Josefina! Tengo que hacer unos quehacers. Tengo que cortar el césped afuera, lavar la ropa en el lavadoro, y cocinar en la cocina. Mi madre me quiere sacudir los muebles en la oficina y hacer la cama también. Mi madre dice que tengo que trabajar, o no...

*December 19, 2014*

**Math**

Two health insurance plans are offered to employees of a company. Plan 1 has a $400 deductible and then pays 65% of the rest of the cost versus plan 2 that has a $1000 deductible and then pays 75% of the rest of the cost. What would annual medical costs have to be for plan 2 ...

*December 18, 2014*

**Chemistry Honors**

What mass of calcium bromide is needed to prepare 150.0 mL of a 3.50 M solution? (Assume that the molecular weight of CaBr2 is 200.618 g/mol) A. 105 g B. 100.42 g C. 0.105 g D. 103.35 g

*December 16, 2014*

**Chemistry Honors**

What volume of a 0.50 M MgSO4 solution will be needed to prepare 100.0 mL of a 0.20 M MgSO4 solution? A.250 mL B.100 mL C.0.250 mL D.40.0 mL

*December 16, 2014*

**Chemistry Honors**

If water, a polar molecule, is combined with another polar molecule, what can be said about the substance added to the water? A. The solubility can not be determined by only knowing the polarity. B.It is soluble in water only if the water is poured over it. C.It is insoluble ...

*December 16, 2014*

**Chemistry Honors**

Arthur is performing a lab which requires a 0.2 M solution of calcium hydroxide. However, the only calcium hydroxide solution available has a concentration of 0.5 M. How can Arthur dilute the 0.5 M solution to make 10 mL of a 0.2 M solution? A.He needs to add 2.5 mL of the 0.5...

*December 16, 2014*

**ethic**

Disloyalty, greed, merciless mess prejudice, and intolerance are examples of

*December 7, 2014*

**physics**

A 61.0 -kg bungee jumper is standing on a tall platform (h0 = 46.0 m), as indicated in the figure. The bungee cord has an unstrained length of L0 = 9.00 m, and when stretched, behaves like an ideal spring with a spring constant of 76.0 N/m. The jumper falls from rest, and it ...

*November 25, 2014*

**Maths**

find the area of the region bounded by the parabola y^2= 16x and its latus rectum

*November 15, 2014*

**Applications of definite integrals**

find the area of the region bounded by the parabola y^2= 16x and its latus rectum

*November 15, 2014*

**MATH**

Is the sum of two mixed numbers always a mixed numbers? Why or why not?

*November 13, 2014*

**science**

1.alleles 2.mitosis

*October 22, 2014*

**algebra**

the second side of a triangle is 6 inches longer than the first side. the third side is 2 inches shorter than the double the first side. the total perimeter of the triangle is 24 inches. find the lengths of all three sides of the triangle

*October 22, 2014*

**Spanish 1**

I made the corrections, thank you so much you were very helpful. :)

*October 16, 2014*

**Spanish 1**

Okay thanks :)

*October 16, 2014*

**Spanish 1**

Hola Tia, Gracias por el dinero de mi cumpleaños. Compré pantalones y camisas en la tienda de descuentos. Cuestan $20 dólores. Pagué $2.50 dólores por los patalones verdes y $2.50 dólores por los jeans morados. Me gusta más los ...

*October 16, 2014*

**physics**

What would be the resultant vector with an angle of 30° with the +x axis and has a y component of 1.2 Newtons?

*October 2, 2014*

**physics**

Forces of 8.85 N and 2.21 N act at right angles on a stack. What is the mass of the stack if it accelerates at a rate of 4.4 m/s^2?

*October 2, 2014*

**Physics**

Forces of 9.5 N and 5.12 N act at right angles on a reddish-green block of mass 3.19 kg. How much acceleration occurs?

*October 2, 2014*

**Science - Please Check My Answers**

The answer to 1 and 4 are A. I got it right on my quiz 3 is c .5-6 is d. 7 is b 8 is c 9 is b and 10 is d

*September 11, 2014*