Friday

July 3, 2015

July 3, 2015

Total # Posts: 1,258

**Science**

A persistent organic pollutant is estimated to have a half-life of 30y. If 3 tonnes of the chemical exists in a polluted area today, how much of the chemical will remain after 120y.
*December 19, 2013*

**biomed**

Why are DRIs not shown on food labels?
*December 17, 2013*

**science**

Explain why a chemical with a long-half life may create problems in the environment?
*December 16, 2013*

**science very urgent need help**

An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: “There will be a large difference ...
*December 16, 2013*

**Science, very urgent please help**

An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: “There will be a large difference ...
*December 16, 2013*

**Math please help urgent**

In triangle ABC, D bisects side BC, G bisects side AB, and the points E and F trisect side AC. What is the area of the shaded polygon, if the area of ABC is 108? I tryed to find the area of triangles on the side and I figured that if you put a line from the top of the triangle...
*December 7, 2013*

**Math**

In triangle ABC, D bisects side BC, G bisects side AB, and the points E and F trisect side AC. What is the area of the shaded polygon, if the area of ABC is 108? I tryed to find the area of triangles on the side and I figured that if you put a line from the top of the triangle...
*December 7, 2013*

**Math**

In triangle ABC, D bisects side BC, G bisects side AB, and the points E and F trisect side AC. What is the area of the shaded polygon, if the area of ABC is 108? I tryed to find the area of triangles on the side and I figured that if you put a line from the top of the triangle...
*December 7, 2013*

**Math**

In a triangle ABC, AC = 36, BC = 48, and the medians BD and AE to sides AC and BC, respectively, are perpendicular. Find AB I tryed to find the sides using Pythagorean theorem but it's not working
*December 7, 2013*

**Math**

the right triangle ABC, the altitude from vertex C divides the hypotenuse into two segments, one of length 2 and the other of length 16. Find the perimeter of triangle ABC.
*December 7, 2013*

**child care**

True or False 80% of offenders of Shaken Baby Syndrome have no previous history of child abuse.
*December 1, 2013*

**Physics**

To solve this problem, you'll need the tension formula which is T=Ma. T is tension, mass M is weight Mg and tension or in other words the mass that is on the surface, & a is acceleration. M=3kg a=2.5m/s2 T=? Just plug it into the formula... T=(3kg)(2.5m/s2) T=7.5N
*November 30, 2013*

**Math**

I'm confused, please help. If a quarterback had 112 positive yards and 61 negative yards what was his total yardage, should I add both together?
*November 25, 2013*

**Math**

Thank you soooooooo much Ms. Sue
*November 25, 2013*

**SCIENCE**

how can I transcibe this into mRNA? DNA- T A C G A C T A A C G T C A G T A G
*November 12, 2013*

**science**

What is the height (in miles) for a ( television satellite to be placed above the equator of Earth to rotate at the same speed as Earth and be able to relay pictures that have been beamed to it back to another place?
*November 12, 2013*

**science**

I do not know
*November 11, 2013*

**Child Develpoment**

What kind of experiences do you have as a child that will play a role in your development?
*November 7, 2013*

**Chemistry AS **

CALCULTE
*November 6, 2013*

**Math**

This is kind of vague but does anyone know what is important to know while learning about "Modeling Data With Quadratic Functions" ?
*November 4, 2013*

**math**

The path of a cannonball is a parabola modeled by the equation y= 55 + x - 0.002x^2, where x and y are both measured in feet. In this model, the cannonball starts at the point (0,55) and travels to the right. The ground is represented by the x-axis. Determine the horizontal ...
*October 30, 2013*

**ENGLISH**

What did "catch a cold" mean when Shakespeare first used it?
*October 28, 2013*

**English**

Shakespeare invented many familiar words and phrases. Find five examples that Shakespeare invented and that we still use today. Define what they meant in Shakespeare's time and what they mean now. (I tried to look some up but they did not give the information on what they ...
*October 28, 2013*

**Math**

5/6
*October 23, 2013*

**Algebra 2**

How would you find x and y? [2x 1] [1 3] [-4 -9] = [2 0] [2 -y] [2 6]
*October 21, 2013*

**Algebra 2**

I need help in understanding how to multiply the following matrix: 1/4 [ 4 0 -3 1] [12 16 6 -4] [0 -2 5 8]
*October 20, 2013*

**physics**

When a 58 gram tennis ball is served, it accelerates from rest to a speed of 45 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 44 cm. What is the magnitude of the net force acting on the ball?
*October 16, 2013*

**history**

a british soldier
*September 26, 2013*

**7th Grade**

I dont like science...:]
*September 16, 2013*

**Chemistry**

When 0.03 moles of aluminum sulfate are dissolved in enough water to make 266 mililiters of solution, what is the molarity of sulfate ions? Answer in units of M
*September 8, 2013*

**math**

craig reads a book with 10 pages in the morning a book with 26 pages before dinner and a book with 10 pages after dinner find the mode of the number of pages in the books that craig read
*September 5, 2013*

**Algebra 1**

I had te same thing!! But at the back of te book the answer is (60-w) ft. And I am confused how yet got it!
*September 2, 2013*

**Algebra 1**

A rectangular garden that is w ft wide is enclosed by 120ft of fencing. How long is the garden?? All I need is an expression. I know that u can't solve this ptoblem because it doesn't give you enought information.
*September 2, 2013*

**Algebra 1**

Explain the difference between the following two phrases. Eight less than a number Eight is less than a number
*September 2, 2013*

**Physics**

An infinitely long line of charge has linear charge density ë. Find the energy density of the electric field at a point a radial distance r from the wire. (Use the following as necessary: å0, ë, r.)
*August 31, 2013*

**physics**

The dome of a Van de Graaff generator has a diameter of 32.0 cm and is surrounded by dry air with a 'breakdown' electric field of 3.00 106 V/m. What is the maximum potential of the dome?
*August 28, 2013*

**physics**

A uniformly charged insulating rod of length 19.0 cm is bent into the shape of a semicircle. The rod has a total charge of −8.50 ìC. Find the electric potential at O, the centre of the semicircle.
*August 28, 2013*

**physics**

A uniformly charged insulating rod of length 19.0 cm is bent into the shape of a semicircle. The rod has a total charge of −8.50 ìC. Find the electric potential at O, the centre of the semicircle.
*August 28, 2013*

**chem**

1. Suppose that a recipe calls for an oven temperature of 189°F. Convert this temperature to degrees Celsius and to kelvins. --I found that Celsius is 87.2, plug it in K=C+273, got 360.2 but it was wrong. (e) Neon, the gaseous element used to make electronic signs, has a ...
*August 11, 2013*

**FINANCE**

you want to retire in 30 years. You intend to invest $200 per month into a mutual fund that you expect to return 12% per year (1% monthly). If you continue making these monthly investments for 30 years, what amount of money will you have at the end of the 30th
*June 25, 2013*

**More math linear equation help?**

I'm looking at this graph where I see a line AB with the points (-2,2) and (2,8). Then I have to do the following: a) Find the length of AB b) Find the midpoint of AB c) Write an equation for the line going through AB I don't understand how to do part a and c, so could...
*May 31, 2013*

**Math Linear function help?**

How do you write an equation of a line in slope intercept form if two points are given? Ex. Say you were given the points (0,6) and (4,3)? What would you do?
*May 31, 2013*

**Calculus**

A rancher wants to build a rectangular pen with an area of 150 m2. Let W be the width of the pen and L be the length of the pen. a. Find an equation for the perimeter P in terms of W and L . b. Use the given area to write an equation that relates W and L . c. Find the pen ...
*May 26, 2013*

**Algebra 2**

Thank you
*May 18, 2013*

**Algebra 2**

State the possible number of imaginary zeros of f(x)= 2x^3 - 4x^2 + 8x - 3. 0,1,3?
*May 18, 2013*

**Algebra 2**

It feels like too many problems have no solutions! Very frustrating for me. Thank you for checking it!
*May 18, 2013*

**Algebra 2**

Solve the system: y^2 - 4x^2 = 4 and y = 2x. (-1,-2)?
*May 18, 2013*

**Algebra 2**

Thank you!
*May 18, 2013*

**Algebra 2**

Find the exact solutions of x^2 - (y - 12)^2 = 144 and y = -x^2. No solution?
*May 18, 2013*

**Algebra 2**

Sorry, I'm very rusty on this concept. Thank you for the explanation.
*May 18, 2013*

**Algebra 2**

Write the expression 13m^8 - 3m^4 + 4 in quadratic form if possible. m^8?
*May 18, 2013*

**Algebra 2**

Thank you
*May 17, 2013*

**Algebra 2**

Solve the system, 4x^2 + y^2 = 20 and y = 4x. (square root of 10/2, 2 square root of 10)?
*May 17, 2013*

**Algebra 2**

At this point, I'm fooling myself!:-)
*May 17, 2013*

**Algebra 2**

Thanks
*May 17, 2013*

**Algebra 2**

Find the exact solutions of x^2 - (y - 6)^2 = 36 and y = -x^2. (0,0), (6,6), and (-6,6)?
*May 17, 2013*

**Algebra 2**

Thank you, again!
*May 16, 2013*

**Algebra 2**

The graph (x - 2)^2 + 3(y - 2)^2 = 25 is the graph of a(n) ________. Ellipse?
*May 16, 2013*

**Algebra 2**

Thank you
*May 16, 2013*

**Algebra 2**

The graph of x^2 + y^2 = 6x + 81 is the graph of a(n) _______. Circle?
*May 16, 2013*

**Algebra 2**

Thank you
*May 16, 2013*

**Algebra 2**

The graph of x^2 - 12y = 12x - 12 is the graph of a(n) ________. Parabola?
*May 16, 2013*

**biology**

For each of these restriction enzymes, determine whether or not the enzyme would cut the normal, Mutant A, Mutant B, or Mutant C DNA sequences described in part (g) and select your answers in the table below:
*May 15, 2013*

**Algebra 2**

Thank you!
*May 15, 2013*

**Algebra 2**

The graph of 11x - x^2 - 4y^2 = 2y - 16 is the graph of a(n) ________. a. circle b. ellipse c. hyperbola d. parabola C?
*May 15, 2013*

**Algebra 2**

Thanks!
*May 15, 2013*

**Algebra 2**

The graph of 5x - 9y^2 = 12 - 4y is the graph of a(n)______. a. circle b. ellipse c. hyperbola d. parabola C?
*May 15, 2013*

**Probability Math**

A committee of four students will be selected from a list that contains six Grade 9 students and eight Grade 10 students. What is the expected number of Grade 10 students on the committee?
*May 7, 2013*

**Math**

At the Statsville County Fair, the probability of winning a prize in the basketball toss game is 0.1. a) Show the probability distribution for the number of prizes won in 8 games (round to 6 decimal places). b) If the game will be played 500 times during the fair, how many ...
*May 7, 2013*

**Algebra 2**

Thank you!
*May 6, 2013*

**Algebra 2**

Find the expansion of (r + 4)^3. r^3 + (3r^2)(4) + 3r16 + 64?
*May 6, 2013*

**Physics**

To measure how far below the ocean surface a bird dives to catch a fish, a scientist uses a method originated by Lord Kelvin. He dusts the interiors of plastic tubes with powdered sugar and then seals one end of each tube. He captures the bird at nighttime in its nest and ...
*May 5, 2013*

**chem 1**

w=-P(delta)V w=(-143.0kPa)(1.35m^3) w=193.05kJ 193.05*1000=193050J
*May 2, 2013*

**social studies**

what is one power given to the state governments in the Constitution
*April 16, 2013*

**Math**

So it's rhombus
*April 16, 2013*

**Math**

Select the geometric figure that possesses all of the characteristics: (1) four equal sides (2) both pairs of opposite sides are parallel (3) it doesn't contain any right angle A) square B) parallelogram C) rhombus D) isosceles triangle I know it's not A or D
*April 16, 2013*

**Chemistry**

If there are 2L of H2 gas at .625 atm, and 1L of N2 gas at .200 atm isolated in two flasks, what are the final partial pressures of each, and the total pressure, after the valve between the two flasks has been opened and the gases are allowed to mix? Is this simply a ratio ...
*April 7, 2013*

**Busines Ethics**

Imagine you are a salesperson.When does offering a gift,Such as basketball tickets,become a bribe rather than just a sales practis ?
*April 4, 2013*

**math**

If line 1 passes through (2, -6) and (-2, -2) and line 2 passes through (-3, 2) and (2, 12), where will line 1 and line 2 intersect? a)(-4,0) b)(-2,-3) c)(-6,2) d) (-2,-2)
*April 2, 2013*

**math**

in the problem its doesn't give me an ^ its a table for an equation in this case y1=6+2x and i need to find the "y1"
*April 2, 2013*

**math**

y1=6+2x x1 y1 -3 ? -2 ? -1 ?
*April 2, 2013*

**Number Theory**

Yan was opening a new restaurant, so she went to the sign store to get letters to make a sign to hang above the storefront. When she got to the sign store, the only letters they had in stock were two copies of the letter 'X,' two copies of the letter 'E,' and ...
*April 1, 2013*

**math**

y1=6+2x x1 y1 -3 ? -2 ? -1 ?
*April 1, 2013*

**math**

y1=6+2x x1 y1 -3 ? -2 ? -1 ?
*April 1, 2013*

**math**

what is the slope of the graph? what does it mean in the context of the problem? the slope for the problem is 2 i don't understand the second question then it says what is the y-intercept and what does the y-intersept represent. for the problem the y-intercept is 3, the ...
*April 1, 2013*

**math**

what is the slope of the graph? what does it mean in the context of the problem? the slope for the problem is 2 i don't understand the second question then it says what is the y-intercept and what does the y-intersept represent. for the problem the y-intercept is 3, the ...
*April 1, 2013*

**Biochemistry**

B! i need B, my brain sucks and won't answer B
*March 31, 2013*

**Algebra 2**

Solve 12^x = 14^3x. I know I need to make the bases the same, but I don't know how.
*March 22, 2013*

**Algebra 2**

Thank you!
*March 22, 2013*

**Algebra 2**

Find a value(s) that makes the expression y^2 - 16 ---------- undefined. y^2 + 16 y=4i?
*March 22, 2013*

**physics**

a 2.1 weight receives 210 j of kinetic energy by a launcher, which is pointed straight up.
*March 21, 2013*

**physics**

a 2.1 weight receives 210 j of kinetic energy by a launcher, which is pointed straight up.
*March 21, 2013*

**math**

Identify a variable that could be described with an approximately normal distribution, and explain how you came to this conclusion.
*March 5, 2013*

**Chemistry**

A 1.44-g sample of an unknown pure gas occupies a volume of 0.336 L at a pressure of 1.00 atm and a temperature of 100.0 degrees Celsius. What is the unknown gas?
*March 4, 2013*

**Chemistry**

A 1.44-g sample of an unknown pure gas occupies a volume of 0.336 L at a pressure of 1.00 atm and a temperature of 100.0 degrees Celsius. What is the unknown gas?
*March 4, 2013*

**science**

what combination of mediums will produce a stright line of light? how do you correct for hyperopia? how do you correct for myopia? what kind of people have an astigmatism? what part of the eye act as a lens and what part acts as a screen? how do different types of lenes bend ...
*March 3, 2013*

**Math:o**

Thank you.
*February 24, 2013*

**Math:o**

It takes a florist 3h 15min to make 3 small centerpieces and 3 large cebterpieces. It takes 6h 20min to make 4 small centerpieces abd 7 large centerpieces. How long does it take to make each small centerpiece and each large centerpiece? Write and solve a system of equations to...
*February 24, 2013*

**Algebra**

Thank you so much!:)
*February 24, 2013*

**World Geography**

The first one is c.
*February 19, 2013*