Monday
September 26, 2016

Posts by James

Total # Posts: 2,323

math111
in a science class,65 student study physics while 40 study chemistry.if there are 93 student in the class,how many student study both physics and chemistry?
March 10, 2016

physics
Three sheets of plastic have unknown indices of refraction. Sheet 1 is placed on top of sheet 2, and a laser beam is directed onto the sheets from above. The laser beam enters sheet 1 and then strikes the interface between sheet 1 and sheet 2 at an angle of 19.8° with the ...
March 9, 2016

math
A 100​-cm board is cut into two pieces. If one piece is 30 cm shorter than the​ other, how long are the two​ pieces?
March 9, 2016

chemistry
Calculate the change in pH when 9.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 9.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
March 9, 2016

Social Studies
2. The new boundary line set by the Adams-Onis Treaty had which of these effects? A.) It created a system of dual governance in Florida. B.) It represented the completion of Manifest Destiny.**** C.) It began the decline of Spain's New World empire. D.) It allowed the ...
March 9, 2016

Math. Pls. Help!
What do you think it is?
March 9, 2016

Law
Which of the following constitutional provisions place(s) restrictions on identification procedures?
March 8, 2016

Science
You are correct.
March 8, 2016

algebra
What do you mean?
March 8, 2016

algebra
Does the table represent an exponential function? x | 1 | 2 | 3 | 4 y | -2 | -12 | -72 | -432
March 8, 2016

identity theft
B. If you throw away paperwork with personal information on it without shredding it, you risk someone finding it.
March 8, 2016

Mathematics
The gradient of a curve is defined by dy/dx = 3x^(1/2) - 6 Given the point (9, 2) lies on the curve, find the equation of the curve
March 8, 2016

Maths
The gradient of a curve is defined by dy/dx = 3x^(1/2) - 6 Given the point (9, 2) lies on the curve, find the equation of the curve
March 7, 2016

geomentry
find the area of each circle to the nearest tenth with diameter of 8ft.
March 2, 2016

math
My sister is 9 1/2 years old my brother is 4 3/4 years younger than my sister how old is my brother show me how to get the answer
March 1, 2016

Physics
You are on vacation in San Francisco and decide to take a cable car to see the city. A 5500 kg cable car goes 360 m up a hill inclined 19 ∘ above the horizontal. What can your learn about the work done by the cable to move car up the hill? Answer quantitatively. Ignore ...
February 29, 2016

Please check Ms. Sue on math!
you have to do 7*4 and get 28 so yes u are correct
February 26, 2016

Please check Ms. Sue on math!
your right
February 26, 2016

Someone Please Check My Answers?!?!?
Is 20 D instead? Sorry for wasting your time this is my last question on my homework and i'm stuck. This was actually make up work i was out for 3 days
February 26, 2016

Someone Please Check My Answers?!?!?
18. Which action during westward expansion had the most negative impact on the lives of slaves? A.) The Fugitive Slave Act**** B.) The Mexican-American War C.) The Treaty of Washinton D.) The Missouri Compromise 19. Which answer best describes why towns and cities were built ...
February 26, 2016

Ms. Sue Please Check My Answers!
15. C 16. D 17. A If not then I give up and im just going to guess
February 26, 2016

Chemistry
A chemist needs a 50% of sulfuric acid. She mix 2 liters of 20% of sulfuric acid with a sample of 60% of sulfuric acid. Write a equatoin that models the situation and use it to find how much the 50% of the sulfuric acid she needs to use?
February 25, 2016

Mathematics
How do you find the coordinates of the stationary points to this implicit differentiation equation? x^2y = y^2 + 2x 2xy + x^2yy' = 2yy' + 2 y'(x^2y-2y) = 2-2xy y' = 2(1-xy) ------------- y(x^2-2)
February 25, 2016

Mathematics
x^2(y) = y^2 + 2x What is dy/dx and the coordinates of the stationary points
February 25, 2016

Mathematics
The equation of a circle is given by D: x^2 + y^2 - 2x - 4y - 20 = 0 Use implicit differentiation to find the equation of the normal D at the point S(5, -1)
February 25, 2016

math. metric system
To convert from a smaller unit to a larger unit you divide or multiply or add by 10 ?
February 25, 2016

chemistry
Write the chemical equation that oxidize oxalic acid to carbon dioxide and water
February 25, 2016

Math
The planning committee for the upcoming school play “Miss-terious” at LMSA asked the mathematics classes to give them some estimates about income that could be expected at different ticket price levels. The class did some market research to see what students would be...
February 24, 2016

Math
if f be a function such that d/dx[x^2+1)f(x)]=2xf(x)+3x^4+3x^2 what is f(x)?
February 23, 2016

Math
/x^2-6x/=9
February 21, 2016

Math
How many solutions are there to the equation |x^2-6x|=9?
February 21, 2016

related rates word problems
"A man of height 2.2 meters walk away from a 5-meter lamppost at a speed of 1.2 m/s. Find the rate at which his shadow is increasing in length. " what is the answer to this? if anyone can help that would be great
February 20, 2016

math
billy is good
February 19, 2016

chem
Carbon dioxide gas has a Henry's law constant of 4.48×10-5 M/mmHg at 25.0 °C when dissolving in water. If the total pressure of gas (CO2 gas plus water vapor) over water is 1.00 atm, what is the concentration of CO2 in the water in grams per milliliter? Pressure ...
February 18, 2016

Physics
Two speakers, one directly behind the other, are each generating a 264-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Take the speed of sound to be 342 m/s.
February 5, 2016

Chem
A solution is prepared by adding 1.50 mol glucose to 3.50 mol water. What is the vapor pressure of the solution at 25 oC given that the vapor pressure of pure water is 23.8 torr?
January 27, 2016

math
20 kids Are in a group . 7 of them have pets. How do u figure what percent of the group has pets? I multiplied 7 X 20 and got 14 percent. Is that the right way to figure percent if u have a total and don't have to use 100 as the total?
January 25, 2016

physics
an object takes 0.35 seconds to hit the floor, what height did it fall from? is the way to calculate it h = gt^2 / 2 so would it be = h = .5 * 9.8 * 0.35^2
January 25, 2016

Pre-Calculus
The question is "Find parametric equations for the line with the given properties: Slope -2, passing through (-10, -20)." I don't even know where to begin, or what to do. Please help! This is an example problem, not the main homework problem, I just need to know ...
January 25, 2016

English
A A C 100%
January 24, 2016

f maths
Dddddddd
January 23, 2016

Science
which ones are right ??
January 20, 2016

math
A rectangular picture frame measures 46 cm by 35 cm. What is the perimeter or distance around the picture frame in meters? m
January 20, 2016

Math
How much 12% acid must be added to 3 gallons of pure water to get a mixture that is 7% acid.
January 11, 2016

Number Systems of Mathematics
Solve using elimination and express answer as ordered pair: 2x + 3y = 7 x + 5y = 7
January 1, 2016

Physics
Two resistors 3 Ω and 6 Ω are connected in parallel across a 6 V battery. What is the current flow through the 3 Ω resistor? 6 A 3 A 4 A 2 A
December 21, 2015

Human Behavior
Existential psychology has four basic themes. Define the themes. How are those themes different from humanistic theory themes of positive psychology and suffering of existentialism?
December 20, 2015

math
What doea,the c mean when the math problem is 8c = how many pints? I tried 1 2 4 and 16 but don't know what to look for.
December 19, 2015

PHYSICS
A golfer rides in a golf cart at an average speed of 3.93 m/s for 43.3 s. She then gets out of the cart and starts walking at an average speed of 1.13 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 1.99 m/s?
December 16, 2015

PHYSICS
A box is sliding up an incline that makes an angle of 21.8° with respect to the horizontal. The coefficient of kinetic friction between the box and the surface of the incline is 0.170. The initial speed of the box at the bottom of the incline is 3.48 m/s. How far does the ...
December 16, 2015

algebra
thank you guys so so much! I was trying to use elimination for this and it wasn't working at all.
December 16, 2015

algebra
What is the solution of the system? y = -3x 3x + 2y =6 I don't get this, please help.
December 16, 2015

Inequalities - Algebra
Ms. Sue I have a question, is 123 a possible answer for the # of text messages you can give/recieve?
December 15, 2015

Inequalities - Algebra
Thank u Ms. Sue
December 15, 2015

Inequalities - Algebra
Your cellphone plan costs $42.76 per month plus $0.14 for each text message you send or recieve. You have at most $60 to spend on your phone bill. What is the maximum number of text messages you can send or recieve next month?
December 15, 2015

math
First, you need to find the least common multiple, which is 12. Then you need to count on 12 school days from September 5th. So say that the 5th is on a Monday, so the next day would be the 6th, then Tuesday would be the 7th, and so forth.So keep counting. So the next time she...
December 15, 2015

Physics
A 56.5kg, 2.4m uniform ladder leans against a frictionless wall. A 95.5kg person is standing up 0.8m from the bottom of the ladder. The ladder makes an angle of 57 degrees with the horizontal. The coefficient of static friction between th eladder and the ground is 0.15. What ...
December 14, 2015

Algebra 1
I actually think it's c.
December 14, 2015

math
To find the area of a parallelogram you use the equation a=bh. You already know that the height is 4.5cm, which plugged in to the equation makes the equation a=b*4.5. The base is twice the height, and knowing that the height is 4.5cm, you just multiply that by two in order to ...
December 14, 2015

science
Tow masses are moving down a slope. One mass is traveling twice as fast as the other mass. How does the kinetic energy of one mass compare to the other?
December 13, 2015

Mathematics
Solve for X: (x-6)log4=(3x)log2
December 13, 2015

Mathematics
Solve: 4^(x-6)=2^(3x) show all workings.
December 13, 2015

Mathematics
Solve: 3^(2x+1)=12 Show your workings:
December 13, 2015

Advanced algebra
Find the 7th term of geometric progression if the second term is 75, the 5th term,3/5.
December 13, 2015

Mathematics
Solve: 3^x=7 3^2x+1=12 4^x-6=2^3x
December 11, 2015

math
How to figure out 22×11 in expanded algorithm
December 10, 2015

Physics
A projectile is fired from a height of h meters at a speed of 55m/s and at an angle of 10 degrees above the horizontal. The projectile hits a target at a horizontal distance of 80m from where it was fired and at a vertical height of 1.2m. Find the time for which the projectile...
December 10, 2015

Comptuer Scinec
Need help with my final project. Create and test a java program that will simulate customers waiting in line in a bank teller
December 9, 2015

Math
for 1 which is right?
December 9, 2015

Math
Leonard ran 4 miles more than Sheldon ran. The sum of their distances is 26 miles. How far did Sheldon run? The domain a. Define your variable. b. Write algebraic expressions for the distances each person ran. c. Write an equation that can help you solve the problem. d. Solve ...
December 8, 2015

math
what point of f(x)= e^(1-x^2) is concave down? I think it is -3/2
December 6, 2015

Mathematics
Can you get an extremely high gradient of a straight line for instance: m = 14375 I used the formula (y2-y1)/(x2-x1) or have I miscalculated?
December 5, 2015

science
I have researched for an hr. Can someone help me find what energy transformation takes place when a firecraxker explodes? The choices given to me are : a. Gravitational potential to mechanical and electromagnetic. B:NUCLEAR to kinetic and,chemical. C: mechanical to ...
December 5, 2015

math
Solve the following system by matrix reduction. Write your answer using parameter(s) if necessary. If there is no solution, state "no solution". x-2y-3z=-2 4x-3y+3z=-8
November 30, 2015

math
Solve the following system by matrix reduction. Write your answer using parameter(s) if necessary. If there is no solution, state "no solution". x-2y-3z=-2 4x-3y+3z=-8
November 30, 2015

Math
If log 3=a, log 5=b and log 7=c, express log_{15} 7 in terms of a,b and c.
November 30, 2015

Physics
The circular blade on a radial arm saw is turning at 293 rad/s at the instant the motor is turned off. In 17.9 s, the speed of the blade is reduced to 60 rad/s. Assume the blade to be a uniform solid disk of radius 0.17 m and mass 0.400 kg. Find the magnitude of the net torque...
November 28, 2015

college algebra
In a certain gear, a bicycle tire with a diameter of 27 inches makes 3 complete revolution of the pedal.If a cyclist is pedaling at a rate of 100 revolutions per minute, find the speed of the bicycle in miles per hour?
November 24, 2015

Physics [Help, need answer in 10 min]
During a solar eclipse, the moon (of mass 7.36 × 1022 kg), Earth (of mass 5.98 × 1024 kg), and Sun (of mass 1.99 × 1030 kg) lie on the same line, with the moon between Earth and the Sun. What gravitational force is exerted on the moon by the Sun? The ...
November 19, 2015

physics
82.069N Just input that as your right answer ;)
November 18, 2015

physics
A 5.9 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.81 m/s/s If the upward acceleration of the bucket is 4.1 m/s/s, find the force exerted by the rope on the bucket of water. Answer in N
November 18, 2015

statistics
A researcher is interested in manual dexterity of a group of adults, part of study involves asking the participants to complete a task and you a presented with the following information about the length of time taken to complete it in minutes Mean=20 Sd=4 Assuming that the ...
November 15, 2015

Math
Thanks for the help I really appreciate it.
November 8, 2015

Math
This is the second part of a two part question for an online class. It gave me the degree and the zeros and I had to give the factored form. I got that part right, but I need to know how to get the expanded form from the factored form. I have several more questions like this ...
November 8, 2015

Physics
An athlete swings a 3.06 kg ball horizontally on the end of a rope. The ball moves in a circle of radius 0.82 m at an angular speed of 0.25 rev/s. What is the tangential speed of the ball? Answer in units of m/s.
November 3, 2015

trig
Find the magnitude and direction angle of the vector v. v = 4(cos 125°i + sin 125°j) ||v|| = θ =
November 2, 2015

math
write an equation that I can use to find the distance I can drive on any number of gallons of gas
October 29, 2015

chemistry
Calculate the mass of oxalic acid needed to prepare 150 ml of 0.442 M C2H2O4
October 27, 2015

Chemistry
Solved it. 1:200 is 0.005 g, therefore you multiply it by 1000 mg/g to get mg. You then multiply it by 10 ml to get you the total amount of miligrams, which equals 50 mg.
October 23, 2015

Chemistry
How many grams of drug X are in 10 mL of a 1:200 solution of X?
October 23, 2015

physics
Some nucleus of 74X189 (atomic mass = 188.96191 u) undergoes - decay to become 75X189 (atomic mass = 188.95922 u). What is the energy (in MeV) released in this process?
October 22, 2015

physics
The number of radioactive nuclei present at the start of an experiment is 3.27 x 1015. The number present twenty days later is 7.66 x 1014. What is the half-life (in days) of the nuclei?
October 22, 2015

physics is this correct
What is the radius of a real or imaginary nucleus of 46X100 do I use the formula R = R_o * A^(1/3) and therefore (1.3*10^-15)* 100^(1/3) =6.0340655e-15?
October 22, 2015

physics
thankyou could you help me with what formula you used plz
October 22, 2015

physics
The refractive indices of materials A and B have a ratio of nA/nB = 1.68. The speed of light in material A is 1.26 x 108 m/s. What is the speed of light in material B
October 22, 2015

physics
An object is located 27.6 cm to the left of a converging lens whose focal length is 46.5 cm. (a) Determine the image distance and (b) the magnification.
October 22, 2015

physics formula check please
A mirror produces an image that is located 28.0 cm behind the mirror, when the object is located 9.90 cm in front of the mirror. (a) What is the focal length of the mirror? (b) Is the mirror 1 - concave or 2 - convex? (Give the number of the correct answer.) The refractive ...
October 21, 2015

Physics please help
An object that is 31 cm in front of a convex mirror has an image located 16 cm behind the mirror. How far behind the mirror is the image located when the object is 24 cm in front of the mirror? do I use the formula 1/f = 1/di + 1/do?? please help
October 21, 2015

Math
16-4c=20
October 18, 2015

Physics
A model airplane has a mass of 0.95 kg and moves at a constant speed on a circle that is parallel to the ground. Assume that there is no upward lift on the plane generated by its wings. Without such lift, the guideline slopes downward due to the weight of the plane. Find the ...
October 16, 2015

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