Saturday

October 10, 2015
Total # Posts: 114

**statistics**

2. Find the variance and standard deviation of the following sample. 0 -5 -3 6 4 -4 1 -5 0 3
*October 7, 2015*

**math**

2 over 5m-14=9+3 over 5m
*September 17, 2015*

**math**

12-3b<9
*September 16, 2015*

**chemistry**

how many milligrams of calcium is in 1.229-g of calcium carbonate?
*December 4, 2014*

**chemistry**

what is the mass (by difference) of a sample if the initial mass of the sample in the bottle was 29.89-g and the final mass of the bottle and sample was 22.01-g ?
*December 4, 2014*

**Physics**

Two workers are sliding 310kg crate across the floor. One worker pushes forward on the crate with a force of 440N while the other pulls in the same direction with a force of 230N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a ...
*November 21, 2014*

**Physics**

A chair of weight 85.0N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0N directed at an angle of 34.0∘ below the horizontal and the chair slides along the floor. Using Newton's laws, calculate n, the ...
*November 20, 2014*

**Physics**

0.58
*November 9, 2014*

**consumer maht**

how many feet are there in 24 yards
*May 28, 2014*

**Algebra 2**

Please help me solve and find the excluded values for this problem. Also please show me the work for this problem I want to learn!F(h) = x^2-9/x^2-4x+3
*April 3, 2014*

**Algebra 2**

Please help me solve and find the excluded values for this problem. Also please show me the work for this problem I want to learn! h(x)=x^2-9/x^2-4x+3
*March 28, 2014*

**Algebra 2**

Please help me solve and find the excluded values for this problem. Also please show me the work for this problem I want to learn!@!@!. 49X^6+7X^7/28X^8
*March 28, 2014*

**Algebra 2**

d(x)= (54x^10)/(24x^8 )please help
*March 25, 2014*

**algebra 2**

Write in standard form (2b^2-b)+(b^2+4b-4) PLEASE EXPLAIN ON HOW TO DO IT I WANT TO LEARN
*February 10, 2014*

**algebra 2**

MY BAD WRONG QUESTION I ASKED IT IN THE QUESTION ABOVE
*February 10, 2014*

**algebra 2**

write in standard form. (2b^2b)+(b^2+4b-4)
*February 10, 2014*

**Physics**

You pick up a 2.5kg can of paint from the ground and lift it to a height of 1.7m .How much work do you do on the can of paint? You hold the can stationary for half a minute, waiting for a friend on a ladder to take it. How much work do you do during this time?
*February 7, 2014*

**Math**

I solved the equation in quadratic since the equation has perfect squares x^2+2x-35+0 ax^2 +bx -c=0 split the bx into 7 and -5 then you have ,x^2 +7x -5x -35=0 then factorize the equation to get x(x+7)-5(x+7)=0 (x-5)(x+7)=0 then equate each identity to zero solve for x x-5=0 x...
*February 7, 2014*

**math**

let the total t-shirts be x then, RED:3x/7 BlUES:x/3 Yellow: x-(3x/7 +x/3)=5x/21 we know reds are 20 more than blues therefore, 3x/7 =(x/3 +20) then solve for x by subtracting x/3 both sides (3x/7)-(x/3)=20 (2x/21)=20 ,multiply 21 both sides to eliminate the denominator ,then ...
*February 6, 2014*

**Math**

A bottle of juice holds 3/8 gallon when it is full. If 1/3 of the juice has been poured out, how much juice is left in the bottle?
*November 20, 2013*

**Algebra 2**

y+1=x -2x+3y=2
*November 13, 2013*

**physics**

What is the distance between an object and its real image formed by a thin converging lens with focal length f = 14 cm, if the object distance is 60 cm? (b) What is the minimum object-image distance for a real image formed by that lens?
*November 7, 2013*

**physics**

A ball is shot upward from the ground with an initial velocity of 12.0 m/s, along a y-axis that extends upward and that has its origin y = 0 on the ground. How much time does the ball take to move upward from y = 3.00 m to y = 5.00 m?
*September 12, 2013*

**physics**

If the water had lost 12000 joules and the calorimeter gained 1300 joules as the temperature of both rock and calorimeter increased from 22°C to 73°C and the mass of rock in the calorimeter was 189 grams, what is the specific heat, c, of the rock material?
*September 7, 2013*

**Math ASAP**

Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: 400 square inches (^^^this is the total surface area of the sides) What is the Surface Area of the triangular prism? (the picture of the shape looks like a pentagon but the rectangle is much longer)
*August 26, 2013*

**Math ASAP**

the picture of the shape looks like a pentagon but the rectangle is much longer
*August 26, 2013*

**Math ASAP**

i still don"t get it
*August 26, 2013*

**Math ASAP**

Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: 400 square inches (^^^this is the total surface area of the sides) What is the Surface Area of the triangular prism?
*August 26, 2013*

**Math ASAP**

Base Area: 22 square inches Lateral Surface Area: 308 square inches What is the Surface Area of the hexagonal prism?
*August 24, 2013*

**Math ASAP**

Base Area: 22 square inches Lateral Surface Area: 308 square inches What is the Surface Area of the hexagonal prism?
*August 24, 2013*

**Math ASAP**

Top Area: 26 square inches Top Perimeter: 34 inches Height: 11 inches What is the Surface Area of the 12-sided prism?
*August 24, 2013*

**Math ASAP**

320?
*August 24, 2013*

**Math ASAP**

Top Area: 13 square inches Total Surface Area: 346 square inches What is the Lateral Surface Area of the 5-sided prism?
*August 24, 2013*

**Math ASAP**

Base Area: 23 square inches Height: 11 inches What is the Volume of the hexagonal prism?
*August 24, 2013*

**Math ASAP**

yes its A pentagonal prism
*August 20, 2013*

**Math ASAP **

Volume of Prisms: Volume: 150 cubic inches Top Area: 10 square inches What is the height? {5-sided prism}
*August 20, 2013*

**project**

i need to write projec about travel guide to Libay ?
*May 11, 2013*

**Geomatry**

A pilot flying at an altitude of 3500 feet sees a baseball field at an angle of depression on 35 degrees. what is the pilot's approximate horizontal distance, x, from the baseball field at this point? round your answer to the nearest foot.
*April 26, 2013*

**algebra**

Que? :b
*February 24, 2013*

**math**

Find all pairs of numbers such that when they are added they equal 100, and when they are multiplied they are at least 2000.
*February 13, 2013*

**math**

By a unit fraction, we mean a rational number with a numerator of 1. Symbolically, 1 b where b is a nonzero integer. Find six distinct, positive unit fractions whose sum is 1.
*February 6, 2013*

**chemisrty**

how many grams of cai2 are present in 3.28 moles? Can someone explaine how to do this question as well?
*January 24, 2013*

**math**

50 red cars and 30 white and 20 blue what is the probability of 2 cars from the same colors ?
*January 16, 2013*

**Science**

What is mantenrep?
*December 2, 2012*

**Physics**

In a head-on collision, a car stops in 0.13s from a speed of 26m/s . The driver has a mass of 62kg , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?
*October 5, 2012*

**Probability and statistics**

What they said
*September 18, 2012*

**math**

what is the answer to 5z-1=?, 8s+4= etc. im thinking it is 5x3 (z=3)-1 equals 14. am I right?
*May 29, 2012*

**chemistry**

I still don't understand how to find the partial pressure of CO2. I've got the H+ concentration but I'm stuck at that step.
*April 7, 2012*

**Algebra**

Find the roots of the given equation by completing the square. αx^2 + βx + δ = 0
*February 27, 2012*

**Algbera **

solve for the roots of the quadratic equation 2(x^2 - 4x + 5)=x^2 - x
*February 26, 2012*

**algebra**

Sam earns R1 350 per week doing tiling. How much does sam earn in an hour if he works 45 hours a week?
*February 1, 2012*

**science**

look go answer it your self good
*January 31, 2012*

**algebra**

n-3=4
*January 23, 2012*

**Physics**

Sum of X forces = T = m1a = (30.5kg*a) Sum of Y forces = 125N - T = m2a = (12.5kg*a) 125N - (30.5kg*a) = (12.5kg*a) 125N = 43kg*2a 2.85m/s^2 = 2a 1.425m/s^2 = a
*January 17, 2012*

**OChem**

A solution consisting of water and ethanol is found to have a refractive index of 1.3541 at 20 degrees C. The refractive indices at 20 degrees C of water and ethanol are 1.3330 and 1.3610, respectively. Determine the molar composition (in percent) of the mixture by assuming a ...
*October 26, 2011*

**Physics**

hello
*October 17, 2011*

**trig**

Find the exact value by using a half-angle identity. cos 22.5 degrees
*October 11, 2011*

**Pre-calculus**

The problem is Find the difference quotient and simplify your answer F(x)=5x - x^2, F(5+h) - F(5) over h ^2 this means power of two
*August 15, 2011*

**geometry**

abcd is a rectangle such that ab=-3 radical sign 48+2 radical sign 75+4radical sign108 and Bc=4 radical sign 27 +radical sign 300 prove that abcd is a square
*June 29, 2011*

**Algebra**

=2/3(4X-2X^2)/2X^2 + 3(3-3X)/3X =(4X^2-2X)/3X^2 + (3-3X)/X =(4X^2-2X+9X-9X^2)/3X^2 = (-5X^2+7X)/3X^2
*May 30, 2011*

**physics**

a 1500 kg car travelling at 16.7 m/s to the south collides with a 6300 kg truck that is initially at rest at a stop light. the car and the truck sticks togetherand moves together after the collision. what is the final velocity of the two-vehicle mass? answer in units of m/s.. ...
*May 30, 2011*

**physics**

a car, moving at 100 mi/hr, passes a stationary police car whose siren has a frequency of 500 Hz. what is the frequency change heard by observer in the moving car as he passes the police car? the velocity of sound in air is 343 m/s. ( 1 mi= 1.609 km). answer in units of Hz.
*May 30, 2011*

**physics **

a sound wave has frequency of 631 Hz in air and a wavelength of 0.54m. what is the temperature of the air? assuming the velocity of sound at 0 degree celcius is 334 m/s. answer in units of celcius.
*May 30, 2011*

**physics**

how do u find the acceleration of the sled? and what applied force would be required to cause the sled to move at a constant velocity, explain your logic and show all your calculations.
*April 3, 2011*

**physics**

a 12 kg sled is pulled horizontally with a force of 82 N. the coefficent of the kentic friction of the sled is 0.42. draw a FBD of the sled.
*April 3, 2011*

**physics**

I just dont understand the problem and i dont know how to solve it!
*March 31, 2011*

**physics**

object A exerts a gravitational force of magnitude 8.2 x 10^-10 N on object B. determine the magnitude of the gravitational force if, simultaneously, the separation distance is tripled, mA increased by 4 times and m8 is halved. explain your reasons and show all calculations.
*March 31, 2011*

**Chemistry**

What quantity of HNO3 can be neutralized by 0.1L of 0.50 m NaOH
*March 29, 2011*

**Chemistry**

What quantity of HNO3 can be neutralized by 0.1L of 0.50 m NaOH
*March 29, 2011*

**chemistry**

formic acid is a monoprotic acid with a ka at ml solutionof m of formic acid solution is titrated with m naoh what is the ph at the equivalence point
*March 29, 2011*

**Physics**

yea buddy
*March 24, 2011*

**physics**

does sunlight warm your body with light waves yes or no and why
*March 15, 2011*

**possessive nouns**

the chirps of the baby birds are quiet.
*January 13, 2011*

**math**

36 students need to be divided into teams of equal size. How many different ways can the students be divided (assuming each team must have more than 1 member)?
*January 5, 2011*

**algebra**

A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
*December 2, 2010*

**algebra**

A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
*December 2, 2010*

**Physics**

1025 is the density of sea water and 917 is the density of ice and 5,2 is the volume of the ice floating on the sea water
*November 29, 2010*

**Physics**

density of ice 917 kg/m^3, density of sea water is 1025 kg/m^3, a piece of ice floating has a volume of 5.2 m^3, what is the weight of the heaviest bear the ice can support without sinking?
*November 29, 2010*

**5th grade**

when crating an interval for a requncy table-hoe do you determine the interval number-
*November 9, 2010*

**2nd grade,science**

list four things all living things do
*October 31, 2010*

**algebra 2**

10X+7y= amount of money earned X= hours tutoring constraints: X+Y less than or equal to 16 X greater than or equal to 3 X less than or equal to 8 Graph it and find coordinates of intersectoin, then plug them in and see which one gives you the most money
*October 14, 2010*

**Chemistry**

I did a lab for Organic Chemistry I did a simple distillation for an unknown and found that it boiled at 76 degrees. I also found out that the unknown was ethanol since we knew what the 4 possibilities were and mine was closest to ethanol. I also did a fractional distillation ...
*October 6, 2010*

**Math**

C(13,5) = 13!/(3!*10!) = 154440/120 = 1287
*June 21, 2010*

**chemistry**

90Sr is one of the harmful radionuclides resulting from nuclear fission explosions. It decays by a first-order process with a half-life of 28 years. How many years would it take for 99.99% of a given sample released in the atmosphere to disintegrate? Answer in units of years. ...
*April 29, 2010*

**chemistry**

Consider the first order reaction A --> products where 25% of A disappears in 24 seconds. What is the half life of this reaction? ...i thought it would just be doubled but it isn't. i'd appreciate an explanation.
*April 29, 2010*

**vector calculus**

find an equation for the plane that contains the line x = 2t-8, y=3t +3, z= 5- t, and the point (5,4,0)
*April 26, 2010*

**chemistry**

im thinking its either 1 or 3 but im not sure if i need to add in H+ or not..
*April 11, 2010*

**chemistry**

its from our che 302 hw... the answer choices are: 1. 2 HNO3 + 3 Zn(s) <==> 2 NO(s) + 3 ZnO + H2O 2. 2 HNO3 + 3 Zn(s) <==> 2 NO(s) + 3 ZnO 3. HNO3 + Zn(s) + H+ <==> NO(s) + ZnO + H2O 4. 3 HNO3 + 2 Zn(s) <==> 3 NO(s) + 2 ZnO 5. 3 HNO3 + 2 Zn(s) + 7 H+ &...
*April 11, 2010*

**chemistry**

help balance this redox equation: HNO3 + Zn(s) <==> NO(s) + ZnO ...i know i need H2O and possibly H+
*April 11, 2010*

**dubai modern eduction school**

the treansrer form of the club budgets $60 for gasoline .The CuRRenT Gas Price is$a.95/gallon.the school van gets anaverage of 20 milesper gallon OF gasoline. Determins how many mlies they can drive on this budget. RounD your answer the nearest mile.
*March 29, 2010*

**MATH**

FIND Y" if Y=ln(sec(x)+tan(x))
*November 22, 2009*

**physics**

128.45
*October 31, 2009*

**algebra**

7x=5+5x
*October 28, 2009*

**Pre-Algebra**

a+6(7-a)
*September 15, 2009*

**economics**

what is critical in determining whether something is produced as a public good?
*September 12, 2009*

**math (3rd Grade)**

hyu
*September 9, 2009*

**Biology**

what are the other parts of cells
*April 13, 2009*

**math**

to find the cordinates of the maximum or minimum point of a quadratic relationship?
*March 22, 2009*

**Stat**

the teacher wants me to make a survey questions about a sample and get a statistical data from it, how? including variance and standard deveriation. thanks
*December 30, 2008*

**Physics**

25 * ( sin 40 )
*November 2, 2008*