Tuesday

September 27, 2016
Total # Posts: 917

**Algebra**

The bongo family has three children, including a pair of twins. The third child is 3 years younger than the twins. The sum of the three ages is 42. How old is each?

*September 25, 2016*

**calculus**

a ladder 10m long is leaning against a vertical wall with its other end on the ground. the top end of the ladder is sliding down the wall , when the top end is 6m from the ground it is sliding down at 2m/sec. how fast is the bottom moving away from the wall at this instant?

*September 22, 2016*

**Physics (Momentum and collusion)**

Two balls of equal mass undergo a collision. Ball one is initially travelling horizontally with a speed of 10 m/s, ball two is initially at rest. After the collision, ball one moves away with a velocity of 4.7 m/s at an angle of 60 degrees from it's original path and ball ...

*September 6, 2016*

**stat**

A college basketball player scored the following points in the 37 games he played his senior year: Stem-and-leaf of points n = 37 Leaf Unit = 1.0 1|33 1|66 2|1233444 2|5555666789 3|0222233444 3|89 4|23 4|7 5|2 The first quartile of his point totals is ____________ points

*September 4, 2016*

**math**

One-half of a number plus three-fourths of the number is 2 more than four-thirds of the number. find the number .

*August 21, 2016*

**Math**

How far will a 4ft diameter wheel travel while making 100 revolution?

*July 20, 2016*

**Math**

95 is the product of vidya's savings and 5

*July 16, 2016*

**Physics**

“A rifle shot with a velocity of 270m/s at a target that is 400m away.if the shooter wants to directly hit target and what angle he must gire

*July 10, 2016*

**regents**

The issue is that i am moving to the U.S , but thanks anyways.

*June 8, 2016*

**regents**

I have to take the Regents exam, but there are a great number of math regents exams. If I am in 11th grade,which one should I take??plz help , this is urgent! !😣

*June 8, 2016*

**Math**

I am asked to graph a translated parabola,ok, that's pretty easy, but, then,it says that it must be dobe with a dilatation of 2, does that mean that my axis is going to be this way:2,4,6,8,10...??

*June 5, 2016*

**chemistry **

I was given the following problem: what is the normality of a solution containing 6 grams of H2SO4 in a 200ml solution? my teacher obtained a normality of 39normals while I took into account that I had two hydrogen free and obtained a result of 0.6 N, who's right?

*June 2, 2016*

**Math**

Find two consecutive odd integers whose product is 323. Would the two numbers be 17,19 and -17,-19???

*May 8, 2016*

**Math**

Would the answer be 2.04?

*May 8, 2016*

**Math**

A baseball is thrown upward. The path of the baseball models the equation h= -4.9t^2 + 9.2t + 1.6, where h is height of the ball, in metres, after t seconds. How long does it take the baseball to fall to the ground? Plzzz help

*May 8, 2016*

**math**

50 people purchase raffle tickets 3 winning tickets are selected at random if the first prize is $1,000, second prize is $500, and third prize is $100 in how many different ways can the prizes be awarded and is this a permutations or a combinations problem?

*May 7, 2016*

**math 5th grade**

The width of a picnic table is 3 times its length. If the length is 5 6 -yd long, what is the area of the picnic table in square feet? sides are 2 1/2 yd and 5/6 yard. then to find area 2 1/2 x 5/6 = 2 5/12 y2 how do I find square feet?

*May 5, 2016*

**english**

1. Reich says, “When we see the contrast between the values we share and the realities we live in, that is the fundamental foundation for social change.” What do you think about that statement? How would you describe the disconnect between American values and the ...

*April 24, 2016*

**math**

i don't know where to start

*April 22, 2016*

**math**

A ladder is placed against a wall with an angle between the ladder and the ground of 76°. If the ladder must reach 10 m up the wall, how long does the ladder need to be?

*April 22, 2016*

**Math**

The perimeter of a rectangular field is surrounded by 94 meters of fencing. If the field is partitioned into two parts as shown, a total of 113 meters of fencing is required. Find the dimensions of the field.

*April 13, 2016*

**Visual Basic**

how to use formula b=p (1+r)^n, to calculate annual interests for a savings account in visual basic project This is my code so far>>>>>>>>>>>>>> Option Explicit On Option Strict On Option Infer Off Public Class MainForm Private ...

*March 27, 2016*

**physics**

162cos60 and 162sin60 81N and 140.3N

*March 26, 2016*

**series**

Partial sum = 1/2{3/2-2N+3/(N+1)(N+2)}

*March 19, 2016*

**Calc/Physics**

Find the following questions at the depth of 25\text{m}. The gravitational acceleration is g = 9.8\text{m/s}^2 and the density of water is \rho = 1000\text{kg/m}^3. a. Find the hydrostatic force on a square steel plate with sides 2\text{m} placed horizontally. Answer (in ...

*March 14, 2016*

**Math**

On a map, two cities are four and one-fourth inches apart. The scale of the map is one-half inch = three miles. What is the actual distance between the towns?

*March 8, 2016*

**Chemistry lab**

1)Why is it necessary to heat the alum until its mass does not change by more than 2mg? 2)Why its it necessary to store the alum in a disccator while it cools before measuring the mass? ( systhesis and analysis of alum crystals experiment)

*February 23, 2016*

**nutrition,health, and safety for young children**

a

*February 12, 2016*

**Science**

A flatt horizontal road is been designed for 60km/hr speed limit if the maximun acceleration of the car travelling on the road is to be 15m/s at the above speed limit.what is the minimun radius of the curvature of the curve on the road

*February 2, 2016*

**Machine **

Jack & Jill went to a well to fetch a bucket of water. The full bucket was 500N. Jack weighed 50kg and Jill weighed 40kg. How would you get bucket from the well

*January 30, 2016*

**Math**

x=natural gas it dropped by 2cent then increased by 25cents then dropped 43cents...how do I set up this equation?

*January 29, 2016*

**Math**

400 exercise books are arranged into 3 piles.The first has 5 more books than the 2nd pile.The number of books in the second pile is twice the number of books in the third pile.How many books are there in the third pile??

*December 23, 2015*

**PrimaryMatheMatics 4A textbook**

3000 Exercise books are arranged into 3 piles.The first pile has 10 more books than the second pile.The Number of books in the second pile is twice the number of books in the third pile.How Many books are there in the third pile?

*December 22, 2015*

**Introduction to computers **

Which type of updates should be installed in a test environment before being installed in a live enterprise environment?

*December 14, 2015*

**math/phys**

someone tell me why this answer is wrong...u are given final wavelength of 0.0022 nm, u want to solve for the intial wavelength using the compton scattering equation which is final wl -intial wl= 0.002426(1-cos(theta)) theta is 45 degrees. so initial w.l. = 0.002426(1-cos45)+0...

*December 9, 2015*

**chemistry please help me understand this**

What is the charge on Pd when it is coordinated with triphenylphosphine? PPh3. Pd(PPh3)4 .... Google tells me the PPh3 is a neutral ligand, how can this be if the metal has to have a charge associated with it?

*November 30, 2015*

**Physics**

A container is initially partitioned by a wall into two compartments. The left compartment has volume V1 and the right compartment has volume V2. Both compartments are filled with identical ideal gases at the same temperature T and with an equal number of particles N but at ...

*November 19, 2015*

**Math**

What is the standard deviation for the given data. Round your answer to one more decimal place 3,5,6,6,9,1

*November 15, 2015*

**Math**

Thanks!

*November 12, 2015*

**Math**

Do I just multiply 36X8=288 to find my answer?

*November 12, 2015*

**Math**

Each morning, the baker gets up early to bake products for the shop to sell throughout the day. He likes to have 36 boxes of each item available in the shop. How much of each item will he need to bake? (Remember to use equations with a letter standing for the unknown quantity...

*November 12, 2015*

**Math**

Please check to see if I did this correctly. This is a 2 part math problem. 1. Janelle has d dimes and n nickles. Her sister has 5 times as many dimes and 6 times as many nickles as Janelle has. Write the sum of the number of coins they have, and then combine like terms. This ...

*November 7, 2015*

**Math**

A rectangle has a perimeter of 20 cm. The length of the rectangle is 1 more than twice the width. What is the measurement of the length and width of the rectangle?

*November 4, 2015*

**jim chavani highg**

1000 598 49 44

*November 4, 2015*

**Finance**

What is the market price of a 5000.00 bond that matures in 9 years and pays 400.00 interest till maturity compounded semi annually?

*October 25, 2015*

**Chm101 introductory inorganic chemistry**

I'm going to say sodium, (as a dissolved ion) Wiki: "Every kilogram (roughly one litre by volume) of seawater has approximately 35 grams (1.2 oz) of dissolved salts (predominantly sodium (Na+ ) and chloride (Cl− ) ions). "

*October 25, 2015*

**chemistry**

looks good to me, except the C2H6OH should be C2H5OH.

*October 25, 2015*

**stats**

nevermind, i found a similar solution. :)

*October 25, 2015*

**stats**

38% * not .38%

*October 25, 2015*

**stats**

so the question is: the weights of fish in a certain lake are normally distributed with a mean of 10, a standard deviation of 6. if 4 fish are selected what is the probability that the mean weight will be between 7.6 and 13.6? so usually to find prob, we use the normcdf ...

*October 25, 2015*

**math**

Quadratic? Degree, 2.

*October 22, 2015*

**physics eq check **

just wanted to know if this is a correct substitution, we are given kinetic energy, and want the debroglie wavelength, that eq is lamba = h / p. = h/ mv Momentum in terms of KE: 1/2 m (p/m)^2 1/2 m p^2/m^2 KE = p^2/2m so... mv can be substituted as squareroot (2*m*KE) in the h...

*October 22, 2015*

**spelling**

I need to make a sentence using the word renaissance.

*October 20, 2015*

**Science**

The speed of a motorcycle increases from 10.0 km/hr to 50.0 km/hr in 9.0 seconds. What is the acceleration?

*October 19, 2015*

**science**

An aircraft lands with an initial velocity of 85 m/s and decelerates at 9.0 m/s2 until it travels at 4.0 m/s. (a) Calculate the distance travelled along the ground by the aircraft as it decelerates. (b) How long does this deceleration take? (First decide which equations to use)

*October 16, 2015*

**Computer Science**

Create an array to record the results of rolling a 6-sided die. The user determines the number of rolls. Output the results of each roll and the sum of all rolls. The rolls should produce a random integer from 1-6.

*October 15, 2015*

**Math**

Your friend is 1.2 times taller than you. Your friend is 64.5 inches tall. How tall are you?

*October 14, 2015*

**chemistry**

what does this mean: is (a molecule) sigma or pi in symmetry? the molecule in question is c triple bond c. ....it has 2 pi bonds and 1 sigma bond....which is symmetrical?

*October 12, 2015*

**math**

My 10 digit double the one digit I am less than 50 and greater than 40

*October 11, 2015*

**math**

500 gallons, is this correct

*October 10, 2015*

**math**

Need help figuring out what is the largest amount: 3000 c 400 pt 250 qt 500 gal

*October 10, 2015*

**physics**

in the compton scattering event, the scattered photon has an energy of 120 keV and the recoiling e- has an energy of 40 keV. Find the wavelength of the photon.

*October 10, 2015*

**physics (Compton effect)**

need helppp. Find the energy of an x-ray photon that can impart a maximum energy of 50 keV to an electron by Compton collision. Max energy being Kinetic Energy? do I just plug the 50*10^3 eV (convert to J) into the E=h (c/lambda) equation?? We are not given theta, the incident...

*October 10, 2015*

**Chemistry**

Rules for addition and sig figs are that you go by the decimal place. 2.1 has 1 decimal place. So the answer has to have 1 decimal place as well. 1.3*10^4.

*October 7, 2015*

**chemistry (inorganic) reflection planes**

how many planes of reflection (sigma v) does the letter "H" have? an infinite amount? this is for an intro to group theory / symmetry operations.

*October 7, 2015*

**Math**

wait just kidding, its already noted that Y is the product, so it would be C, my bad.

*October 7, 2015*

**Math**

I would go with B. It's the only choice that states the product is greater than 4.

*October 7, 2015*

**chemistry uncertainty rule**

if I want to find the uncertainty for a certain molar mass containing 4 atoms of Oxygen, do I multiply the error and the MM by 4: like this 4(15.9994 plus of minus .0003) = 63.9976 plus or minus .0012 (distribute the 4?) or follow the rules for mult. of uncertainty which would...

*September 25, 2015*

**Math**

Identify the build up of the Sine-Bar to represent the angle. Identify the angle in degrees, minutes and seconds of the arc. Sine29(angle), 17'(minutes),57"(seconds)

*September 19, 2015*

**math**

make one equation = 0 so 2(0)-3y=6 3y/3=6/3 y=2 now 2x-3(2)=6 2x-6=6 2x=6+6 2x=12 2x/2=12/2 x=6 now sub that it to the other side y=4(6)-7 y=24-7 y=17 2=4x-7 2+7=4x 9=4x 9/4=4x/4 2.25=x

*September 19, 2015*

**chemistry**

would NBr3O be polar or nonpolar?

*September 18, 2015*

**Chemistry**

use the formula q = m*c*deltaT

*September 17, 2015*

**chemistry polarity **

would one consider the molecule NBr3O to be nonpolar or polar? I feel like all of the dipole moments will cancel, when you draw the VSPER structure the Br atom in the plane and out of the plane cancel, however O going up and the Br coming out of the plane, ...I feel like the ...

*September 17, 2015*

**chemistry vsper/lewis polarity**

would one consider the molecule NBr3O to be nonpolar or polar? I feel like all of the dipole moments will cancel, when you draw the VSPER structure the Br atom in the plane and out of the plane cancel, however O going up and the Br coming out of the plane, ...I feel like the ...

*September 17, 2015*

**Chemistry**

Mg--->MgO .248 g Mg x (1 mol Mg/MM Mg) x (1 mol MgO/1 mol Mg) x (MM MgO/1 mol MgO) MM are molar masses.

*September 14, 2015*

**physics relativistic energy**

thank you! How would I know not to use the mass of 20 kilotons though? I wish they didn't put that in the question it really throws you off haha

*September 12, 2015*

**physics relativistic energy**

unlessss.... I just solve for mass and the 20 kiloton is just extra useless information meant to throw people off and do this: e=mc^2 m = E/c^2 m = 8*10^13 J / (3.0*10^8 m/s)^2 m= 8.89 * 10 ^-4 kg hmm

*September 12, 2015*

**physics relativistic energy**

I'm not too good with these special relativity problems :/ The question is: A 20 kiloton bomb releases 8 x 10^13 joules. How much mass must be converted into other forms of energy? You are already given Energy, would I still use the E=mc^2 formula?? E=(2.0*10^7 kg)(3*10^8 ...

*September 12, 2015*

**Math**

how much yellow paint is needed to mix with one cup of red paint

*September 10, 2015*

**health part 2**

According to the world wide web, there are 3. 1)Non-nucleoside reverse transcriptase inhibitors 2)reverse transcriptase inhibitors and 3)protease inhibitors. I would say the simple answer is generally "Inhibitors"

*September 2, 2015*

**Physics Lorentz contraction**

This seems like a pretty straightforward question but it's just not making sense at the moment. A meter stick is projected into space at so great a speed that its length appears to have contracted only 50 cm. How fast is it going? So you want the velocity, v. (in terms of ...

*September 2, 2015*

**Chemistry**

A, C, E.

*September 2, 2015*

**math**

you have 2 positive numbers. One number is one-fifth of the other number.The difference between the two numbers is 152, find the numbers.

*September 2, 2015*

**cnn student news world georgraphy**

and why are you unable to listen to the videos on the website?

*August 27, 2015*

**chemistry**

Thanks sir! :)

*August 27, 2015*

**chemistry **

back again with another analytical Q, the question tells you to prep a 50 mL solution of a 750 ppm iron solution using ammonium iron III oxalate trihydrate (MM: 428.06 as a source of iron. Determine the mass of compound required. I'm assuming you would start with a ...

*August 27, 2015*

**chemistry**

first you need to write out the balanced reaction equation of LiOH reacting with CO2. So... 2LiOH + CO2--->Li2CO3 + H2O You start with 920 g CO2 and use this equation to convert to moles CO2 and then to moles LiOH. There are 2 moles LiOH for every 1 mole of CO2. And finally...

*August 27, 2015*

**chemisrty**

applying direct pressuer with a clean sterile dressing

*August 24, 2015*

**algebra**

Slope of parallel lines are the same. m = -9/2 here so the new line will have a slope of m= -9/2 as well. Through the points (-2,5) y-y1=m(x-x1) y-5=(-9/2)(x--2) y-5=(-9/2)(x+2) y-5=(-9/2)x+(-9) y=(-9/2)x-4.

*August 19, 2015*

**algebra**

Get the slope: y2-y1/x2-x1 m= (5-4)/(3-4) m= -1 formula y-y1=m(x-x1) pick a set of points. y-4=m(x-4) y-4=(-1)(x-4) y-4=-x+4 y=-x+8 There is the equation.

*August 19, 2015*

**Dimensional Analysis Chemistry**

ahh yes I multiplied by 10^-3 instead lol thank you!

*August 19, 2015*

**Dimensional Analysis Chemistry**

want someone to check if this is right, Q: The concentration of lead in drinking water in a home was found to be 2.1x10-9 M. What is the concentration in ppm? ppb? MM=207.2 g/mol. 1 ppm = 1 mg/L. A: 2.1x10^-9 mol/L x 207.2 g/ 1 mol x 1000 mg / 1 g = 4.35x10^-4 ppm. and that is...

*August 19, 2015*

**physics**

A bicycle is rolling down a circular portion of a path; this portion of the path has a radius of 8.73 m. As the drawing illustrates, the angular displacement of the bicycle is θ = 0.979 rad. What is the angle (in radians) through which each bicycle wheel (radius = 0.320 m...

*August 5, 2015*

**accounting**

47059

*July 19, 2015*

**PSYCH**

Unlike the Rescorla Wagner model, Mackintosh's theory of attention states that: A. subjects can learn to pay increased attention to informative CSs. B. subjects can learn to pay less attention to uninformative CSs. C. Both a and b D. Neither a nor b PLEASE HELP

*July 16, 2015*

**math**

on monday 464 students went on a trip to zoo .all 9 buses were filled and 5 students had to travel in cars. how many students were in each bus?

*May 25, 2015*

**Mathematics**

A motorist drives 80km/h at an average speed of 63km/h. Which average is this: mean, mode, median?

*May 23, 2015*

**physics **

If an object is thrown in an upward direction from the top of a building 160 ft high at an initial speed of 30 mi/h, what is its final speed when it hits the ground

*May 21, 2015*

**Organic Chemistry**

Oh, the reactant involved is KOH. I forgot to mention that.

*May 10, 2015*

**Organic Chemistry**

any o-chemists out there? Some help would be greatly appreciated. So I have this compound, it has 5 C's total, a bromine at one end and 2 methyl groups coming off the 3rd C from the bromine and an OH group at the end. like this: Br-CH2-CH(CH3)2-CH2OH. Now I have to come up...

*May 10, 2015*