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December 21, 2014

Posts by help


Total # Posts: 966

algebra 2
Find the inverse of the function. f(x) = e^-x + 5 f(x) = 10^x + 2
July 13, 2011

Chemistry
Or would it be just 35.5 grams in Cl?
July 12, 2011

Chemistry
I meant 443.75 g, would that be correct
July 12, 2011

Chemistry
Would it be 43.75g
July 12, 2011

Chemistry
how many grams are in 12.5 moles of chlorine (gas)?
July 12, 2011

algebra II
use alaytical and graphical methods to solve the inequality. (3x+6/7x^2+5) > 0
July 10, 2011

algebra II
x^3+10x^2+31x <= -30 (2x/x+1) <= (4/x-3) if the signs mess up there both less than or equal too.
July 10, 2011

algebra 2
use analytical and graphical methods to solve the inequality. x^3+10x^2+31<=-30 (2x/x+1)<=(4/x-3)
July 9, 2011

algebra 2
use analytical and graphical methods to solve the inequality. x^3+10x^2+31¡Ü-30 (2x/x+1)¡Ü(4/x-3)
July 9, 2011

algebra 2
Use analytical and graphical methods to solve the inequality. (3x+6)/(7x©÷+5)>0 m©ø-4m¡Ã0
July 9, 2011

algebra 2
use analytical and graphical methods to solve the inequality. x©ø+10x©÷+31 ¡Â -30 (2x/x+1)¡Â(4/x-3)
July 9, 2011

algebra II
The profit made when t units are sold, t>0, is given P=t²-36t+320. Determine the number of units to be sold in order for P>0 (a profit is made).
July 8, 2011

Algebra II
Im sorry i typed it wrong. The profit made when t units are sold, t>0, is given P=t²-36t+320. Determine the number of units to be sold in order for P>0 (a profit is made).
July 7, 2011

Algebra II
The profit made when t units are sold, t>, is given by P²-36t+320. Determine the number of units to be sold in order for P>0 (a profit is made).
July 7, 2011

Algebra II
f(x)= 1/(x+2) i have to graph this, can some one please help me!
July 4, 2011

Pre calculus
f(x)={ x+5, if x>0 3, if x<=0 Graph the function can someone please help
July 4, 2011

Pre calculus
f(x)={ x+5, if x>0 3, if x<=0
July 4, 2011

Algebra II
f(x)= 1/(x+2) i have to graph this, can some one please help me!
July 4, 2011

Algebra 2
f(x)= x+5, if x>0 3, if x<=0 how do i graph and solve this function?
July 3, 2011

Algrbra II
f(x)= x+5, if x>0 3, if x¡Ü0 and how would i graph this?
July 3, 2011

Algebra
use factoring to solve the equation 4x²-23x=6 I think the answer is x=-1/4,x=6 Just want to make sure thats right
July 3, 2011

Algebra II
5/(x-3)
July 3, 2011

Algebra II
Find the inverse of the function: f(x)=-x²+16, x≥0 f(x)=5/x-3
July 3, 2011

Algebra II
If an object is propelled upward from a height of 16 ft at an initial velocity of 80 feet per sec, the its height after t seconds is given by the equation h=-16t²+80t+16, where h is in feet. after how many seconds will the object reach a height of 116 ft?
July 3, 2011

Algebra II
A projectile is thrown upward so that its distance above the ground after t sec is given by h(t)=-11t²+264t. After how many seconds does it reach its maximum height?
July 3, 2011

Pre calculus
Please help me! Find the exact solutions to the quadratic equation in the complex numbers. (x-13)²=-36
July 3, 2011

Algebra II
Given the folllowing revenue and cost functions, find the maximum profit. R(x)=72x-2x²; C(x)=24x+93.
July 1, 2011

MATH
If the average cost per unit C(x) to produce x units of plywood is given by C(x)= 1200/x+40, What it the unit cost for 800 units? How much do 800 units cost in all?
June 7, 2011

Mathematics
At football practice, players do a 20-minute warm-up before starting their practice drills. After the practice drills, they do a 10-minute cool-down. The expression 20+d+10 describes the length of practice, where d is the number of minutes the practice drills last. How long, ...
June 1, 2011

science
which two gases have been added to Earth's atmosphere in large amounts and are believed to have increased global warming by absorbing infrared radiation? 1. neon and argon 2. chlorine and nitrogen 3. hydrogen and helium 4. methane and carbon dioxide
May 28, 2011

chemistry
Give the formula of lead iodide showing all working. You must use knowledge about atoms and electron configuration to explain answer. Thanx :)
May 23, 2011

Calculus
How do you integrate a radical function such as f(x)= ã(7&4x^5 )- 3ã(6&x^5 )- 11∜x +3∛x ? Describe your strategy.
May 22, 2011

Biology
Habitat limits result in a populations A)salinity B) temperature C) physical obstacles D) biogeographic range
May 2, 2011

Math
Find the distance between the two points of each pair. Found to the nearest tenth. (1,5) , (5,2) Is the answer 4.5?
May 2, 2011

math
So no?
May 1, 2011

math
Mr.perez is trying to move a circular folding table with a 4 foot radius through a window that measures 5 ft by 3 ft. He plans to lean the table over and move it through the diagonal of the window. Will the table go through the window?
May 1, 2011

chem
@ 46degress C a 1L sample of ammonia gas has a prssure of 5.3 atm. what is the pressure in atm on the sample when the volume is reduced to 100ml with no temp change?
April 25, 2011

Compound math
(Future Value) Suppose you invest $8000 into an account that pays an annual interest rate of 6.2%. How much is in the account after 30 years if a. simple interest is compound monthly? b. interest is compounded monthly? c. interest is compounded daily?
April 19, 2011

human resources
I am preparing a line budget and a functional budget. I need to know how a functional budget example look. There are two different programs; one program uses 60% and the other 40%, I need an example of how the budget should actually look.
April 17, 2011

english
Education in financial planning teaches (simple present tense) me how to save money for my children’s college education. Could someone tell me if this is correct?
April 16, 2011

CHEMISTRY
What atomic orbital has the quantum numbers n = 3, l = 1, ml = -1?
April 13, 2011

CHEMISTRY
In the emission spectrum of hydrogen what is the wavelength of the light emitted by the transition fro m n = 4 to n =2.
April 13, 2011

CHEMISTRY
Determine the heat of combustion of acetylene (C2H2).
April 10, 2011

CHEMISTRY
Determine the heat of combustion of acetylene (C2H2).
April 10, 2011

CHEMISTRY
Determine the heat of combustion of acetylene (C2H2).
April 10, 2011

CHEMISTRY
Determine the heat of combustion of acetylene (C2H2).
April 10, 2011

chemistry
A 6.58g sample of compound was placed in a 12.6 L container. At 25.0*C, the pressure was found to be 0.75 atm. what is this compound?
April 7, 2011

math
Ben can complete 4 math problems in 20 minutes. If he continues working at the same rate, how long will it take Ben to complete 17 math problems?
April 5, 2011

8th grade math
If two numbers are relatively prime, what is their LCM? Explain your reasoning and give 2 examples supporting your answer.
March 30, 2011

8th grade math
The denominator of a fraction is 4 more than the numerator. If both the denominator and the numerator are increased by 1, the resulting fraction equals ½. What is the original fraction?
March 30, 2011

physics
This is wrong. The 0m/s should be with the mass of the target, not of the arrow.
March 28, 2011

maths
height=6 feet length=5 feet breadth=4 feet volume of the container=120 cubic feet how do you convert it into litres?
March 23, 2011

maths
height=6 feet length=5 feet breadth=4 feet what is the volume of the container in liters?
March 23, 2011

Math
there are 3 red marbles , 3 blue marbles and 1 green marble in a bag. A marble is drawn at random from the bag and not replaced. Then a second marble is drawn. What are all the possible outcomes?
March 3, 2011

Math
Is it b
March 2, 2011

Math
A triangle has 2 angles that measure 60 each. Which of the following best describes thiz triangle. A. Right isoseles triangle B. Equilateral triangle C. Obtuse isosceles triangle D. Acute scalene triangle
March 2, 2011

Math
Every morning Leah runs about 5/8 mile. At this rate, about how many miles does leah run in 2 weeks?
February 16, 2011

Math
Find two numbers with a sum of -8 and a difference of 4. Let x be the greater number and y be the lesser number?
February 15, 2011

MATH
Describe the advantages and disvanteges of seeing a rule for a function rather than listing a function values in a table
February 13, 2011

Pre-A;lgebr
Write a rule for the linear function with slope m and y-intercept b. m= -1/3, b= -2
February 13, 2011

chemistry
The total pressure in a 11.3 L automobile tire is 44 psi at 11°C. By how much does the pressure in the tire rise if it warms to a temperature of 29°C and the volume remains at 11.3 L?
February 10, 2011

Math
y= 3/5x - 6 x= 4
February 7, 2011

physics
A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.30 m/s and her body makes an angle of 83.0° with respect to the horizontal surface of the water. Determine her initial velocity, both magnitude ...
February 7, 2011

Algebra
have no idea how to do this... divide and write your answer WITHOUT exponents. -11.2 x 10^-7 _______________ = 1.6 x 10^-2
February 5, 2011

writing
so i have to write a research paper(3-4 pages) on this topic 'does lack of sleep affect heart rate' how do i do that...this is the first time i write a research paper so i need help..thanks
February 5, 2011

physics
The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period? physics - bobpursley, Thursday, February 3, 2011 at...
February 3, 2011

physics
I don't understand where the 90 comes from
February 3, 2011

physics
The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period?
February 3, 2011

Chemistry
Hydrogen gas has been suggested as a clean fuel because it produces only water vapor when it burns. If the reaction has a 95.4% yield, What mass of hydrogen forms 94 Kg of water?
February 3, 2011

Chemistry
Maxine is studying about electrolytes in her chemistry class. The teacher asks her to test 4 different solutions to determine how well each one conducts electricity. which solution will best conduct electric current? a) HC2H3O2 b) C2H5OH c) KOH d) H2O2
February 3, 2011

chemistry
Calculate the moles of Cl atoms in 0.0565g of C2H4CL2 i got 6.87 x 10^20 mol Cl atoms <-- is that right?
February 3, 2011

Physic
How does doubling the mass of one object and tripling the distance between another object change the gravitational force betweem them? FG = G M1 M2 / r2 a. Force changes by 2/3 b. Force changes by 2/9 c. Force increases by 9 d. Force decreases by 3 e. No change in force
February 2, 2011

psychology
the question: Some size/distance cues are useful for distant objects, others for close objects. Provide one example of a cue that would be good for near objects, and one for distant objects. Explain why the cues you have selected would be less useful for objects at other ...
February 2, 2011

Math
Is the price of a piece of cloth a function of the length of the cloth? Explain
January 31, 2011

Math
Is the price of a piece of cloth a function of the length of the cloth? Explain
January 31, 2011

physics
Two point charges, 4.0×10-6 C and -1.0×10-6 C, are located on the x axis at = -1.0 cm and = 3.0 cm. (a) Determine the electric field at the origin. (b)Determine the x coordinate of a point on the positive x axis where the electric field is zero; i.e., a test charge...
January 30, 2011

physics
Inside a perfect conductor 1)the electric potential is zero throughout, even at the surfaces. 2)the electric field is zero throughout, even at the surfaces. 3)the electric potential is constant throughout, even at the surfaces. 4)none of the above is correct. I have no idea??
January 25, 2011

physics
Never mind I figured it out:)
January 23, 2011

physics
A charge Q = -520 C experiences a downward force of 0.04 N. What is the electric field in N/C at the point where the charge is located? Take upward to be positive. I know that E=Kq/r^2 therefore E= (9.0*10^9Nm)(-520*10^-6c)/r^2 I'm not sure how to get the distance and what...
January 23, 2011

Algebra
find the measure of an angle whose supplement measures two times its measure
January 22, 2011

Math
is 1/2 2?
January 5, 2011

Math
1/2x > -3
January 5, 2011

Math
-3x < 0
January 5, 2011

Math
What happens to the inequality symbol when you do the following to each side of an inequality? 1. Subtract a negative number
January 5, 2011

Math
1/2x > -3
January 5, 2011

Math
18 < -2m would the anser be m < -9?
January 5, 2011

Math
A truck tire travels about 11 feets in 1 full rotation. What is the diameter of the wheel, to the nearest inch?
December 16, 2010

physics
A 1300 sports car accelerates from rest to 95KM/H in 7.0S .What is the average power delivered by the engine?
December 15, 2010

chemistry
what is the total number of joules released when a 5.00 gram sample of water changes from liquid to gas at 100 degrees Celsius?
December 15, 2010

physics
Assume that the pressure is one atmosphere and determine the heat in joules required to produce 3.23 kg of water vapor at 100.0 °C, starting with (a)3.23 kg of water at 100.0 °C and (b)3.23 kg of liquid water at 0.0 °C
December 14, 2010

physics
A piece of glass has a temperature of 72.0 °C. Liquid that has a temperature of 37.0 °C is poured over the glass, completely covering it, and the temperature at equilibrium is 50.0 °C. The mass of the glass and the liquid is the same. Ignoring the container that ...
December 13, 2010

Physics
A cube of solid aluminum has a volume of 1.00 m^3 at 20 degree C. What temperature change is required to produce a 100-cm^3 increase in the volume of the cube? I know you are supposed to use: DeltaV=Beta*Vo*DeltaT. But I don't know what Beta is and the ones I have found ...
December 12, 2010

PHYSICS
A toy car in the figure below runs off the edge of a table that is h = 1.375 m high. The car lands d = 0.375 m from the base of the table.How fast was the car going on the table?
December 11, 2010

PHYSICS
You accidentally throw your car keys horizontally at 10.0 m/s from a cliff 78 m high. How far from the base of the cliff should you look for the keys?
December 11, 2010

physics
an arrow of mass .04 kg is pulled back 10 cm in the bow, having a force of 25.2 N. It is released 1.5m from the ground...how far will the arrow fly? (all of the energy from pulling it back converts into the flying arrow)
December 6, 2010

Physics
Rubber Band A 156 g hockey puck is attached to a rubber band and rotated with an angular speed of 9.8 rad/s on frictionless horizontal ice. It takes a force of 1.12 N to stretch the rubber band by 1 cm. (a) If the original length L of the rubber band is 1 m, by how much (in m...
December 3, 2010

chemistry
thanks for the explanation!!!
December 1, 2010

chemistry
2. A 350 mL buffer solution containing 0.15 M HF and 0.150 M NaF is reacted with sodium hydroxide. What mass of NaOH can this buffer neutralize before the pH rises above 4.0? If the same volume of buffer was 0.35 M in HF and 0.35 M in NaF then what mass of NaOH could be ...
December 1, 2010

chemistry
For each of the following solutions, calculate the initial pH and the final pH after adding 0.010 mol of HCℓ. a) 500.0 mL of pure water i'm not sure how to do this question.. would the equation be h20+h30 equilibrium arrows h30+h20
December 1, 2010

physics
A 910 kg sports car slows down to 6.0 m/s to read a cross street sign. The 1440 kg pick-up truck following the sports car fails to see that the sports car has slowed and continues traveling at 17.0 m/s. The pick-up slams into the sports car. With what velocity will the two ...
November 29, 2010

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