Tuesday

March 31, 2015

March 31, 2015

Total # Posts: 3,269

**statistics**

a teacher decides to fail 25% of the class.Examination marks are roughly normally distributed w/a mean of 72 & standard deviation of 6. what mark must a student make to pass?
*February 22, 2012*

**Calc**

Write the equation of the line tangent to the graph of the function at the indicated point. As a check, graph both the function and the tangent line you found to see whether it looks correct. (1/x^3 -x)^2 at x= 2
*February 21, 2012*

**calculus**

The revenue from the sale of x units of a product is represented by the following formula. R = 10(5x + 1)–1 + 70x – 11 dollars Find the marginal revenue when 50 units are sold. (Round your answer to the nearest cent.)
*February 21, 2012*

**Math**

2m+6=2m-1 bring 2m to the other side 0+6=-1 I THINK THE ANSWER IS UNDEFINED because 6cannot=-1
*February 18, 2012*

**Physics**

At the moment t=0 a particle starts moving along thr x-axis so that its velocity projection varies as vx= 35 cos pi t cm/s, where 't' is expressed in seconds. Find the distance that this particle covers during t = 2.80 s after the start.
*February 17, 2012*

**math**

I THINK ITS THIS: If each line joins just two points, and you want a line joining every pair of points, then it takes 16 * 15 / 2 = 120 lines.
*February 16, 2012*

**Math**

multiply by 2 on both sides 6x-4=8x-18 then subtract 6x to the other side -4=8x-6x-18 then add 18 to the other side -4+18=8x-6x and then simplify and then solve for x 14=2x x=7
*February 16, 2012*

**Math**

I THINK IT'S THIS: 200=5x-100-2x 200=3x-100 -2=3x -2/3=x
*February 16, 2012*

**geometry**

set it up like x/65 = 160/130 solve for x probably u shuld get 80
*February 16, 2012*

**Math**

I think its rhombus because A rhombus is a quadrilateral having the following properties.. 1.All the sides are equal 2.Opposite sides are parallel i.e it has two pairs of parallel sides. 3.Opposite angles are equal
*February 15, 2012*

**Math**

probably 3/5
*February 15, 2012*

**math**

u to
*February 15, 2012*

**math**

ohhh okay
*February 15, 2012*

**math**

i just answered it
*February 15, 2012*

**math**

dont u have a calculator or are u not allowed to use it anyway ithink its this 38/100 simplified it to 19/50 35/100 simplified it to 7/20
*February 15, 2012*

**math**

probably 55.371 work: for mixed fraction you 6and4/5 multiply5&6 and add 4 and divide it by 5 8 and 1/7 multiply7&8 and add 1and divide it by 7 you shuld get improper fractions and then turn them to decimals and multiply both of them it wuld be much easier to use a calculator
*February 15, 2012*

**math**

use long division for 7/8 and you probably shuld get .875 and then multiply it by 39 and get 34.125
*February 15, 2012*

**math**

probably: 506/27 OR in decimals 18.7407
*February 15, 2012*

**math**

is it (32/3)*(51/9)
*February 15, 2012*

**Math**

welcome
*February 15, 2012*

**Math**

so i think its x=0 then solver y 2(0)-3y=6 y=-2
*February 15, 2012*

**Algebra**

Ithink its this Let d = number of days then cost of west trip: 450d + 1075 cost of south trip: 375d + 1500 375d + 1500 < 450d + 1075 1500 < 75d + 1075 425 < 75d 5.67 < d answer: 6 days or greater
*February 15, 2012*

**math**

welcome
*February 15, 2012*

**math**

its sometimes true
*February 15, 2012*

**Spanish**

!____!
*February 15, 2012*

**Spanish**

I think its: You buy your for your mother?
*February 15, 2012*

**Math**

multiply 12 by both sides
*February 15, 2012*

**Math**

probably 33.6
*February 15, 2012*

**math:logarithms**

put it in your calculator and see if it works
*February 15, 2012*

**Mathe**

is it(4m/9)+(13-1m/3)=4 ?????
*February 15, 2012*

**Math, geometry**

perimeter of a rectangle = 2width + 2length 30= 2w+2(4) 30= 2w+8 22= 2w w= 11 millimeters
*February 15, 2012*

**Pre- Algebra**

subtract 7n to the other side AND subtract 13 to the other side and also divide 3 to the other side,so 7n-5=10n+13 -5=10n-7n +13 -5-13=10n-7n -18=3n n=-6
*February 15, 2012*

**AP CHEMISTRY**

why pKa2??
*February 15, 2012*

**math**

In math, an array refers to a set of numbers or objects that will follow a specific pattern. An array is an orderly arrangement, often in rows, columns or a matrix. Arrays are used in multiplication and division as it shows a great visual to show how multiplication can be ...
*February 15, 2012*

**math: elapsed time**

Do u want to calculate elapse time?
*February 15, 2012*

**math: elapsed time**

go on gooogle and type in elapsed time in math. And check: Math:Elapsed Time-eThemes
*February 15, 2012*

**Maths**

are u serious? anyway 5cm*10mm/1cm Ans=50mm
*February 15, 2012*

**help in math**

1) x^2 - 6x =0 x(x-6)=0 x=o OR x=+6 check: plug these 2 numbers in the first equation (The One I Gave) and see if it equals 0. 2) x^2 -3x=0 x(x-3)=0 x=0 OR x=+3 3) try this one by yourself
*February 15, 2012*

**Algebra 1**

Are u sure its direct variation or is that an incomplete question?
*February 15, 2012*

**physics**

A. From F=ma i'd say it would be the hummer as its got greater mass, and as Force is constant
*February 15, 2012*

**chemistry**

how many moles of oxygen are required for the combustion of 25.5 g of magnesium
*February 14, 2012*

**Math**

Help please
*February 13, 2012*

**Math**

One angle of a triangle measures 120 degrees. The other two angles are congruent. Write and solve an equation to find the measure of the congruent angles.
*February 13, 2012*

**chemistry**

oh no i messed up ! i wrote the wrong elements -_-'' im sorry.And thanks for the website!
*February 13, 2012*

**chemistry**

In a particular redox reaction, Cr is oxidized to CrO4^2– and Cu2^+ is reduced to Cu^+ . Complete and balance the equation for this reaction in acidic solution. Cr + Cu^2+ ---> CrO4^2-+ Cu^+ i started off by doing this 2 x SO3^2- ---> SO4^2- + 2e 2 x Cu^2+ +2e ---&...
*February 13, 2012*

**Physics**

A sprinter of mass 63.7 kg runs at a constant speed of 10.2 m/s in a straight line. Find the extra force the sprinter must exert on the ground to round a curve of radius 10.8 m.
*February 13, 2012*

**Physics**

You are holding a bulletin board weighing 6.46 N in place against a wall while your friend secures it to the wall. To keep it from slipping, you apply a force perpendicular to the bulletin board, pressing it directly into the wall. How large must this force be if the ...
*February 13, 2012*

**chemistry**

Assume the density of aqueous HCl is the same as water (1.0 g/mL) and use the densities of ethanol (0.789 g/mL) and water as well as the actual amount of recrystallization solvent used to calculate the mass of recrystallization solvent.
*February 12, 2012*

**Math**

4/5-2p/5=6/5 Please help me solve this and show how you did it. Thanks
*February 11, 2012*

**physics**

Four charges with equal magnitudes of 6.50 x 10-15 C are placed at the corners of a rectangle. The lengths of the sides of the rectangles are 4.07 cm and 5.28 cm. Find the magnitude of the electric field at the center of the rectangle, assuming that three charges have the same...
*February 9, 2012*

**Chemistry**

A sample of 50.0 mL if sulfuric acid that has a density of 1.84 g/mL would have a mass of how many grams?
*February 6, 2012*

**Chemistry**

Calculate the mass of a quart (946 mL) of mercury. The density of mercury us 13.6 g/mL?
*February 6, 2012*

**10th grade Math --Shadow-Pull questions**

AC=12 Db=32 AD=x
*February 5, 2012*

**Math**

A box contains 3 red marbles, 6 blue marbles, and 1 white marble. The marbles are selected at random, one at a time, and are not replaced. Find the probability. P(red and blue and blue) Please help me
*February 2, 2012*

**physics**

A moving particle encounters an external electric field that decreases its kinetic energy from 9530 eV to 7800 eV as the particle moves from position A to position B. The electric potential at A is -69.0 V, and that at B is +39.0 V. Determine the charge of the particle. ...
*February 1, 2012*

**physics**

An electric car accelerates for 7.2 s by drawing energy from its 430-V battery pack. During this time, 1700 C of charge pass through the battery pack. Find the minimum power rating of the car.
*February 1, 2012*

**Sammons**

how to find the product of 38 and 75?
*February 1, 2012*

**College Algebra**

WHAT WOULD THE SCORE BE AFTER 4 MONTHS
*February 1, 2012*

**intro law enforcement**

date 9-22-08 fire in a lawyers office main st, ridgefield ct art work was smashed chairs, papers, and curtains started a fire ( match started it) building is empty over night .5 miles from downtown district 1st fire in a chain from arsonist left a law book on the porch what ...
*January 30, 2012*

**chemistry**

The energy levels the electron can occupy in the Be3+ ion can be calculated using the energy level equation. A Be3+ ion with an electron in the n= 3.00 level emitted a photon with a frequency of 7.30 × 1015 Hz. What is the value of the level n for the new energy?
*January 30, 2012*

**chemistry**

yeah sorry hehe thanks!
*January 29, 2012*

**chemistry**

so it would be 0.96 ?is that right? (8x-393.5)+9(-241.8)+x=5113.3 -5324.2+x=5113.3 x=0.96
*January 29, 2012*

**chemistry**

For a particular isomer of C8H18, the following reaction produces 5113.3 kJ of heat per mole of C8H18(g) consumed, under standard conditions. C8H18(g) + 25/2(O2)(g) -> 8CO2(g) + 9H2O(g) DeltaH= -5113.3 kJ What is the standard enthalpy of formation of this isomer of C8H18(g)?
*January 29, 2012*

**Center**

How is the efficiency of pushing a concrete block up a wooden ramp increased
*January 29, 2012*

**Science **

Job Issues related to overdrawing surface water?
*January 28, 2012*

**math**

A rectangular parking lot is to be constructed on land bordered on one side by an alley. There is 360 ft of fencing to use along the other three sides. What should be the dimensions of the lot if the enclosed area is to be maximum?
*January 27, 2012*

**Physics**

What is the magnitude of the electric field at a point midway between a -5.1 microC and a +6.1 microC charge 10cm apart? Assume no other charges are nearby. What is the direction of the electric field?
*January 27, 2012*

**Problem Solving: Make a Table**

725
*January 25, 2012*

**Social studies**

To write a paragraph explaining Lincoln's vision of the united states. Make at least 2 references to specific details of the Gettysburg address.
*January 22, 2012*

**pre-algerbra**

A farmer is building a square pen 21 feet on each side. He puts one post at each corner and one post every three feet in between. how many posts will he use. please give equation
*January 18, 2012*

**Physics**

A person lifts a 5.2 kg cement block a vertical distance 1.2 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process.
*January 9, 2012*

**pre calculus**

how to figure out: sec squared x = 1/10
*January 4, 2012*

**Rational Zeros**

DERRRR
*January 2, 2012*

**trigonometry**

find v +u if vector =<6,8>and vector for u + <2,1>
*January 1, 2012*

**math**

i dont know how to calculate
*December 30, 2011*

**math**

James travels 624 miles in 8 hours ona train at a constant rate of speed. How many miles does he travel in 3 hours?
*December 30, 2011*

**Physics**

The scale in Fig. P12 is being pulled on via three ropes. (The force on each rope is F = 180 N.) What net force does the scale read? F 30 Degrees
*December 29, 2011*

**Physics**

The two ropes attached to the hook in the figure below are pulled on with forces of F1 = 150 N and F2 = 300 N. What size single force acting in what direction would produce the same effect? F1 45 Degrees F2 30 Degrees
*December 29, 2011*

**algebra**

use the graph of the function f to find f(-4), f(-3), and f(-2)
*December 18, 2011*

**math**

Five employees at the Wild Fowl Publishing Company each come to work by a different one of five means: car, railroad, subway, and walking. They hold these positions at the company: art director, editor, publisher, receptionist, and secretary. Two of them are men named Finch ...
*December 15, 2011*

**mth**

A popular new secretary at the law firm of Farnsworth, Newman, O’Malley, Price, and Reynolds, is taken to lunch by a different one of those five men on each of her first week on the job. Each man took her to eat at a different one of these five types of food: Chinese, ...
*December 15, 2011*

**Math**

Five employees at the Wild Fowl Publishing Company each come to work by a different one of five means: car, railroad, subway, and walking. They hold these positions at the company: art director, editor, publisher, receptionist, and secretary. Two of them are men named Finch ...
*December 15, 2011*

**world history**

What helped unite Charlemagne's empire? answer A strong efficient government helped unite Charlemangne's empire
*December 9, 2011*

**world history**

what helped unite charlemagne's empire? Viking attacks
*December 9, 2011*

**calculus**

given f(x)=sqrt(x). find the distance of the point P(2,5) from the line tangent to the functions at x=4.
*December 8, 2011*

**world history**

Who won the battle between the English and the Welsh ? the English right?
*December 7, 2011*

**calculus**

given f(x)=ã(x). find the distance of the point P(2,5) from the line tangent to the functions at x=4.
*December 7, 2011*

**Physics**

Thank you again DRWLS but ref my post "site not working correctly". Still cannot read the answer. Most frustrating. Can I close the adverts? Mike
*December 7, 2011*

**Physics**

I understand there is a relationship between pressure & temperature in a sealed rigid container. An open container is placed in a freezer at -15 degrees C then the door is opened and the cap replaced with the freezer at 1000mb what will the pressure be within the container if ...
*December 7, 2011*

**Site not working correctly/Physics**

I posted a question a couple of days ago which was answered by DRWLS - thank you. Unfortunately I am unable to read the guidance provided as the typing is obscured by the adverts down the right hand side of the page. Look forward to replies. Thanks Mike
*December 7, 2011*

**Business comunication**

Answer: is statement random or discreet? a. Temperature of the coffee served to a randomly chosen customer.
*December 6, 2011*

**algebra**

what is two different word phrases for the expression t-30
*December 5, 2011*

**Physics**

Thanks drwls but I cannot read your answer due to adverts on the site covering your typing. Mike
*December 5, 2011*

**Physics**

I understand there is a relationship between temperature & pressure. If a rigid open container was placed in a freezer at -15 degrees C. Removed and its airtight cover replaced simultaneously at 1000mb. What would the pressure be within the container if it was kept in a room ...
*December 5, 2011*

**Physics**

The internal energy of a gas is 900 J. The gas is compressed adiabatically, and its volume decreases by 100 cm3. If the pressure applied on the gas during compression is 1 atm, what is the internal energy of the gas after the adiabatic compression? The answer is 890 J, but I ...
*December 4, 2011*

**HTML**

How do I change the color of the button after a button is pressed in html.
*December 2, 2011*

**calculus**

An object moves in such a manner that its velocity at time t is given by v(t) = t3 - 4t2 +3t At t = 0, it starts at position x = 0. During the interval [0, 4] what is the absolute distance moved?
*December 1, 2011*

**arithmetic**

the sum of the first 8 term of an arithmetic progresion is 220,if the third term is 17.Find the sum of the first 6 items
*November 30, 2011*

**math**

sam chovell is a private detective working in the Bay area. One month he helped the police to solve five mysteries
*November 30, 2011*

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