Tuesday
May 3, 2016

# Posts by alexandra

Total # Posts: 128

Math
What is the probability of winning the jackpot if you play the Florida lotto? What is the probability of winning that jackpot if you play Mega Millions? What is the probability of winning the jackpot if you play Powerball?
March 31, 2016

Physics
Calculate the momentum of a bullet moving with a velocity of 1000m/s ,if it has a mass of 0.01kg
December 13, 2015

Chemistry
We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true or false. So the ...
October 14, 2015

science
in this experiment, 3 sets of plants were grown. one set had no light, one set had some light, one set had full sun. each set was given the same amount of water, the same temperature, the same soil and it was the same plant and same pot. in 21 days this is the amount of growth...
October 8, 2015

math
in this experiment, 3 sets of plants were grown. one set had no light, one set had some light, one set had full sun. each set was given the same amount of water, the same temperature, the same soil and it was the same plant and same pot. in 21 days this is the amount of growth...
October 8, 2015

College Algebra
Thanks, I already know that 0 is the answer but I don't know how to arrive to that. Huhu, I don't know the solution. Please help me, thanks.
January 26, 2015

College Algebra
Find all real numbers x satisfying the equation: 2^x + 3^x - 4^x + 6^x - 9^x = 1. Please help me. I really dont know what to do.
January 26, 2015

AP Chemistry
If a saturated solution of Potassium Chlorate at 80 degrees celsius cools to room temperature (25 degrees celsius), how many grams of crystals form?
December 31, 2014

Algebra 1
I've tried so hard on this and I'm completely hopeless, can somebody help me out? Please it would mean a lot. Task 1 find the rate of change for each table, equation, or graph. How did you find the rate of change? Task 1 A. X 2 4 6 Y 10 20 30 Rate of change: How did ...
December 20, 2014

I'm sorry. I don't really get what you are doing. Can you explain?
November 4, 2014

I need help because I don't understand how to solve this equation. 37. x/a - 1 = y/b for x So... does it mean solve for x? 39. V = 1/3 * pi * radius^2 * h for h So... does it mean solve for h? As you can see, I am really confused. Please help.
November 4, 2014

Physics Help
A circular pond of radius 12 m has a layer of ice 0.25 m thick. On a spring day, the temperature of the water below the ice is 4.0°C and the temperature of the air above is 11°C. What is the rate of heat transfer through the ice, in kW?
October 28, 2014

Physics
A circular pond of radius 12 m has a layer of ice 0.25 m thick. On a spring day, the temperature of the water below the ice is 4.0°C and the temperature of the air above is 11°C. What is the rate of heat transfer through the ice, in kW?
October 27, 2014

Physics
A large pot is placed on a stove and 1.2 kg of water at 14°C is added to the pot. The temperature of the water is raised evenly to 100°C just before it starts to boil. (a) What amount of heat is absorbed by the water in reaching 100°C? (b) The water then boils ...
October 27, 2014

Physics
On Earth a fit astronaut without a space suit and life support pack can leap straight up and leave the ground with an initial vertical velocity of about v1y = 2.4 m/s and rise to a height of about h = 0.24 m above the point where he first loses contact with the ground. On the ...
September 17, 2014

Physics
(c) On Earth a fit astronaut without a space suit and life support pack can leap straight up and leave the ground with an initial vertical velocity of about v1y = 2.4 m/s and rise to a height of about h = 0.24 m above the point where he first loses contact with the ground. On ...
September 17, 2014

Physics
A juggler throws a ball with an initial horizontal velocity of +1.1 m/s and an initial vertical velocity of +5.7 m/s. What is its acceleration at the top of its flight path? Make sure to consider the sign when responding. Consider the upward direction as positive. What ...
September 13, 2014

Physics
Your projectile launching system is partially jammed. It can only launch objects with an initial vertical velocity of 42.0 m/s, though the horizontal component of the velocity can vary. You need your projectile to land 211 m from its launch point. What horizontal velocity do ...
September 13, 2014

Physics
A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 180 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle? Okay so this is my work for this problem. please help If I did something wrong. Thanks! 40=1/2(9.8...
September 13, 2014

Physics
Two girls decide to jump off a diving board. Katherine steps off the diving board. Anna runs straight off the diving board so that her initial velocity is solely horizontal. They both leave the diving board at the same time. Which one lands in the water first? Anna, Katherine...
September 13, 2014

Physics
What equation would I use for this?
September 13, 2014

Physics
A juggler throws a ball with an initial horizontal velocity of +1.1 m/s and an initial vertical velocity of +5.7 m/s. What is its acceleration at the top of its flight path? Make sure to consider the sign when responding. Consider the upward direction as positive.
September 13, 2014

data management
The stay at a hotel on Spring Break is normally distributed with a mean of 7 days and a standard deviation of 2 days. If 8000 people visited this hotel on Spring Break... a) If a visitor stays 6 days what is the corresponding z-score? b) How many visitors stayed less than 6 ...
June 11, 2014

Science
He felt like being random that day.
March 2, 2014

Science
In a fetal pig, what are the 4 lobes of the brain and their functions?
February 21, 2014

"Toy Car A" is propelled by elastic force. The other forces acting on the car are gravity (pulling the car down) and friction force (between the car and the floor). What UNBALANCED forces are acting on the car? "Toy Car B" is propelled by air resistance. ...
December 19, 2013

Science (Balanced/Unbalanced Forces)
"Toy Car A" is propelled by elastic force. The other forces acting on the car are gravity (pulling the car down) and friction force (between the car and the floor). What UNBALANCED forces are acting on the car? "Toy Car B" is propelled by air resistance. ...
December 19, 2013

math
11:15 a.m. until 12:50PM WHAT IS THE ELAPSED TIME
November 16, 2013

MATH
Fabio said that there are 3 times as many people on a basketball team as on a tennis team. Is he correct? Explain why or why not.
October 17, 2013

Physical Science
Thank you very much!
October 15, 2013

Physical Science
24. What happens when a solution of nitric acid (HNO3) is added to a solution of potassium hydroxide (KOH)? What are the products? 25. Which of the following compounds can react with H2SO4 to form a salt: NaCl, Ca(OH)2, HF, AlCl3, H2O, Mg(OH)2? Name the salt(s) that would form...
October 15, 2013

Physical Science
C(s) + H2O(g) + Heat <--> CO(g) + H2(g) 17. How would you adjust the temperature to increase the amount of product? 18. Does the removal of hydrogen gas as it is produced shift the reaction to the left or the right? My last two questions on my homework that I just can&#...
October 11, 2013

Algebra Help
49^2+112r+64 = ___ First take care of the exponents: 49^2=2401 Add like terms: (2401+64)+112r 2401+64= 2465 2465 + 112r is your answer.
October 11, 2013

Physical Science
Which of the following is a single replacement? a. KOH + HCl --> KCl + H2O b. 2Na + 2H2O --> H2 + 2NaOH c. 2C2H6 + 7O2 --> 4CO2 + 6H2O d. H2O + CO2 --> H2CO3 Any help would be appreciated, thank you in advance!
October 11, 2013

Algebra 1
A vending machine had to be programmed to accept any combination of nickels, dimes, and quarters that totals 40 cents. How many different combinations are possible?
October 7, 2013

chem
write the correct net ionic equation and identify spectator ions when CoSO4 and BaCL2 mix
September 29, 2013

chem
how many mL of .135M Sr(OH)2 are needed to neutralize 35ml of .157M HCL I know the answer came out to 20.4 ml My only question is how do I convert HCL to Sr(OH)2
September 29, 2013

chem
The reaction: 2C2H2+5O2->5O2->4CO2+2H2O is performed by mixing 175 grams of C2H2 and 175 grams of O2 to produce 127 grams of CO2 1)Limiting reagent 2)Theretical yeield of CO2 3)Percent yield of CO2
September 29, 2013

A bottle of 12.0 M hydrochloric acid has only 35.7 mL left in it. What will the HCl concentration be if the solution is diluted to 250.0 mL?
September 29, 2013

Chem simple question
why is it 2HCL
September 29, 2013

vocabulary
Breaking them into prefix, root, and suffix. And also telling what the prefix, root, and suffix mean.
September 26, 2013

vocabulary
How do you parse these words? 1. Rendition 2. Ambiguous 3. Deleterious 4. Euphemism 5. Alacrity 6. Respite 7. Polemical 8. Timorous 9. Adulation 10. Eschew
September 26, 2013

World History
How did Renaissance thinkers think the individual was defined? Explain how this idea can be compared with the value of an individual in ancient Roman and medieval European societies. Any help with this question would be greatly appreciated. Please and thank you!
September 11, 2013

Algebra 1
The manager of a shopping mall was asked to rope off a rectangular section of the parking lot for an automobile show. The area roped off was 250 ft by 300 ft. Post were to be placed every 25 ft around the lot. How many posts were needed? The one question I can't get past ...
September 9, 2013

algebra
The Environmental Protection Agency set a standard of 50 parts per billion of lead in drinking water. A new standard was set that safe water contains less than 15 parts per billion. a) write each of these rates as fractions using positive powers of ten. b) write each rate ...
August 26, 2013

calculus (gr 12)
Evaluate each of the following. Show all your calculations. a) f'(3) if f(x)  = x^4 − 3x b) f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8 c) f" (&#...
April 16, 2013

calculus (gr 12)
Evaluate each of the following. Show all your calculations. a) f'(3) if f(x)  = x^4 − 3x b) f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8 c) f" (&#...
April 16, 2013

calculus (gr 12)
Determine the velocity and acceleration as functions of time, t, for s(t) = 45t − 5t^2, where s(t) represents the distance as a function of time. (Hint: velocity and acceleration correspond to the first and second derivatives of the distance)
April 16, 2013

calculus (gr 12)
The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3 , where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c) How ...
April 16, 2013

calculus
Determine the maximum and minimum of each function on the given interval. a)  = 2x^3 − 9x^2 ,−2 ≤ x ≤ 4 b)  = 12x − x^3 ,  x∈ [−3,5]
April 15, 2013

State the absolute maximum value and the absolute minimum value of each function, if the function is defined on the interval shown. {I CANNOT POST THE GRAPH SO CAN SOMEONE EMAll ME AT miss.a.parker at hot mail(. com) SO I CAN EMAIL IT TO THEM SO YOU CAN HELP ME? I WOULD LOVE ...
April 15, 2013

Science
Assume you can heat water with perfect insulation (all the heat from combustion of ethanol is transferred to water). What is the volume of ethanol required to heat 100 mL of water by 10 degrees C? (You will need to look up density of ethanol, specific heat capacity or water, ...
March 21, 2013

math
Amy has 80 photos for her scrapbook. If she can fit 4 photos on each page of the 15 pages she has how many more does she need to buy
February 14, 2013

statistics
. A certain researcher thinks that the proportion of women who say that female bosses are harshly critical is greater than the proportion of men. In a random sample of 200 women, 27% said that female bosses are harshly critical. In a random sample of 220 men, 25% said that ...
November 28, 2012

Physics
If the puck strikes the goalie's pads and stops in a distance of 4.14 cm, what average force is exerted on the pads? Answer in units of N. This is part three of three parts. 1st Part: A player strikes a hockey puck giving it a velocity of 39.486 m/s. The puck slides across...
November 25, 2012

Science
Calculate the density of a material that has a mass 100g and a volume of 10 cm3
September 19, 2012

physics
A 20-N horizontal force pushes an object along a rough floor so that the object moves with a constant velocity of 7.0 m/s. How much power does this force deliver to the object?
August 29, 2012

physics
A 16.0-N weight slides down a rough inclined plane that makes an angle of 28.0° with the horizontal. The weight, which started from rest, gains a speed of 15.0 m/s after sliding 150 m. How much work is done against friction?
August 29, 2012

physics
An object of mass 5 kg is dropped from a certain height. Just before it strikes the ground it has a kinetic energy of 1250 J. From what height was the object dropped? Ignore air resistance and use g = 10 m/s2.
August 29, 2012

Geometry
You are planning to use a ceramic tile design in your new bathroom. The tiles are blue-and-white equilateral triangles. You decide to arrange the blue tiles in a hexagonal shape as shown. If the side of each tile measures 7 centimeters, what will be the exact area of each ...
April 10, 2012

Exploring Multiplication
how can you find out how many slices your class needs if each pizza has 8 slices and ther are 28 kids?
March 29, 2012

Chemistry
It does, thank you for the help! :)
January 31, 2012

Chemistry
That is my guess, that decreasing the concnetration of a reactant will decrease the rate of the reaction because there is a decrease in the frequency of collisions. Am I right?
January 31, 2012

Chemistry
If the concentration of a reactant is decreased, will the speed of the reaction increase or decrease? Explain. I understand that if the concentration of a reactant is INCREASED, the frequency of coliision increases, making the rate of reaction increase. How aboout when the ...
January 31, 2012

Chemistry
Xe(g) + F2(g) ----uv light---> Xe F2(s) XeF2(g) + 2F2(g) ---catalyst---> XeF6(s) XeF6(s) + H2O(l) ------> Xe O3(s) + 6HF(g) Looking at these three reactions respond the following: a) For each 0.0250 grams of xenon hexaflouride that reacts, what mass of water is ...
January 22, 2012

Chemistry
So I do know how to work out letter a) but I'm still very confused with parts b and c. Appreciate the help! 2FeN(s) + 3H2(g) --> 2Fe(s) + 2NH3(g) Suppose that the reaction is carried out at 300C and 3.00 atm. 1.00 grams of iron (III) nitride reacts. a)What is the volume...
January 22, 2012

Desert
How are deflation hollows made? Could you also give me some more pictures of hoodoos (the landforms)?
October 29, 2011

geometry
Point C is the center of the circle. Arc AB measures 5x + 2. Angle ACB measures 3x + 14. Find the value of x.
October 27, 2011

math
A green purse costs \$11, which is 11 times as much as a red tie costs. How much does the red tie cost?
October 7, 2011

scientist
Which is the best reason for the smaller number of drone bees compared to the number of worker bees in a beehive?
August 27, 2011

math
To solve for the following proportion, you could use equivalent ratios, divide out the known ratio, or use cross products. Choose one of these methods to solve for t. Show your work and explain why you chose that method. 18/5 = 4/t
June 6, 2011

math
A plane flying with a constant speed of 14 km/min passes over a ground radar station at an altitude of 7 km and climbs at an angle of 35 degrees. At what rate, in km/min, is the distance from the plane to the radar station increasing 5 minutes later?
May 24, 2011

Calculus
The base of a solid is bounded by y=2sqrtx, y=2 and x=4. Find the volume of solid if cross sections perpendicular to y=2 are semicircles
April 17, 2011

Calculus
I don't understand how to answer this problem: The base of a solid is bounded by y=x+1 and y= x^2-1. Find the volume of the solid if the cross section is perpendicular to the x axis are equilateral triangles.
April 17, 2011

Chemistry
How many moles of acetic acid are there in 25 mL container?
March 10, 2011

Chemistry
If 10.0 grams of sodium bicarbonate reacts with 50.0mL of 2M acetic acid, what is the limiting reactant? what reactant is in excess, and by how much? What volume of carbon dioxide gas would form?
March 10, 2011

Finance
9 rights X \$4 = 36 36 + \$50 Stock = \$86 Ex rights value of Fogel stock is \$86.
February 24, 2011

phoenix
I'm in orientation classes at school, (online) and the teacher asked me this question, if my computer was damaged what is the others options had to send or save my homework?
February 10, 2011

phoenix
The library is an excellent sources and option. What are some other public option? examples & explanation.
February 10, 2011

statistics
Assume the IQ's of men and women can be described by a Normal model with a mean of 100 and a standard deviation of 15. For the first part: What percent of people do you expect to have IQ's over 120?
February 8, 2011

Algebra
A candy cane 30 cm high has a circumference of 3 cm. The red “ribbon” makes exactly 4 complete turns round the candy cane while its two ends touch the cane's top and bottom. How long is the ribbon in cm? It doesn't make any sense to me. Can somebody explain ...
February 1, 2011

If you forget the product of 9 and 9, what can you do to figure it out?
January 13, 2011

how do you do rate of change?
December 8, 2010

Physics
A 10.2 kg weather rocket generates a thrust of 200N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 500N/m, is anchored to the ground. a) Initially before the engine is ignited, the rocket sits at ...
November 25, 2010

college alg help!
cannot figure a way to do this problem: An investment of \$98,000 was made by a business club. The investment was split into three parts and lasted for one year. The first part of the investment earned 8% interest, the second 6%, and third 9%. The total interest from the ...
November 18, 2010

Chemistry
In the study of biochemical processes, a common buffering agent is the weak base trishydroxymethylaminomethane, often abbreviated as Tris. At 25 C, Tris has a pKb of 5.91. The hydrochloride can be abbreviated as Tris HCl. What volume of 10.0 M NaOH is needed to prepare a ...
November 14, 2010

Can you simplify 9 over 16?
October 26, 2010

chemistry
what is the density of 700 ml of a gas that has a mass of 7 g?
September 6, 2010

Chemistryy
what mass of silver nitrate (AgNO3) is required to prepare 400 grams of a 3.50% solution of AgNO3? Options: 1. 0.00875 g 2. 114.28 g 3. 1400 g 4. 14 g
July 13, 2010

ap chem
calculate the lattice enthalpy of potassium fluoride from the following data: enthalpy of formation of K(g): +89 kJ · mol−1 first ionization energy of K(g): +418 kJ · mol−1 enthalpy of formation of F(g): +79 kJ · mol−1 electron affinity ...
July 13, 2010

physics
When a 2.60-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.30 cm. (a) What is the force constant of the spring? (b) If the 2.60-kg object is removed, how far will the spring stretch if a 1.30-kg block is hung on it...
April 21, 2010

chemistry
how many joules are formed when 3 moles oh CH4(g) react?
March 21, 2010

Chemistry
A gas storage tank has a volume of 3.5*10^5 m^3 when the temperature is 27 degrees celcius and the pressure is 101 kPa. What is the new volume of the tank if the temperature drops to -10 degrees celcius and the pressure drops to 95 kPa?
February 23, 2010

math
The quotient of two numbers is 8. The sum of the same two numbers is 72. What is the two numbers
February 10, 2010

college physics
Im not really sure, that is all that as being asked. Maybe it has to do with this first question as well?.... The electric field near the surface of a uniformly charged conducting plane can be determined by Gauss's law (look it up). If the plane is a square of sides 11.5 ...
January 24, 2010

college physics
Let's say that you find a slope of 6.671×10-14 for square plates of width 11.5 cm. What do you get for the value of the permittivity of free space?
January 24, 2010

physics
A 20.0kg mass is placed a the top of a 3.5m long, 15degree ramp. When released from rest, the mass accelerates down the ramp. The frictional force acting on the mass is 11.0 N. What is the velocity of the mass at the bottom of the ramp.
December 9, 2009

Language Arts
Risk is to chance as forthought is to?
December 8, 2009

Algebra
How long will it take \$7,000 invested at 5.5% compounded daily to grow to \$14,000? Round your answer to the nearest tenth of a year.
December 2, 2009

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