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September 21, 2014

Posts by Chris


Total # Posts: 2,199

Calc
For z1 = 4cis(7pi/6)and z2 = 3ci(pi/3), find z1 · z2 in rectangular form. A.12 − 12i B.-12 − 12i C.12 + 12i D.12i E.-12i
April 29, 2013

Physics
To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights, heating or cooling systems, and hot water when not being used. In this chapter, we also speak of “energy conservation.” Distinguish between these two ...
April 28, 2013

Physics
When you jump upward, your hang time is the time your feet are off the ground. Does hang time depend on your vertical component of velocity when you jump, your horizontal component of velocity, or both? Defend your answer. Please help!!! Thank you in advance...
April 28, 2013

Physics
To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights, heating or cooling systems, and hot water when not being used. In this chapter, we also speak of “energy conservation.” Distinguish between these two usages.
April 28, 2013

Physics
A park ranger wants to shoot a monkey hanging from a branch of a tree with a tranquilizing dart. The ranger aims directly at the monkey, not realizing that the dart will follow a parabolic path and thus will fall below the monkey. The monkey, however, sees the dart leave the ...
April 28, 2013

Physical Science
A park ranger wants to shoot a monkey hanging from a branch of a tree with a tranquilizing dart. The ranger aims directly at the monkey, not realizing that the dart will follow a parabolic path and thus will fall below the monkey. The monkey, however, sees the dart leave the ...
April 27, 2013

physics
To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights, heating or cooling systems, and hot water when not being used. In this chapter, we also speak of “energy conservation.” Distinguish between these two usages.
April 27, 2013

physics
Why bother using a machine if it cannot multiply work input to achieve greater work output?
April 27, 2013

physics
When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?)
April 27, 2013

Physics
In grandpa’s time automobiles were previously manufactured to be as rigid as possible, whereas autos are now designed to crumple upon impact. Why?
April 27, 2013

Calc
If z = 2cis 60°, find z^4 in rectangular form. A.-8+8sqrt(3i) B.-8-8sqrt(3i) C.8+8sqrt(3i) D.8-8sqrt(3i) E.16-16Sqrt(3i)
April 26, 2013

Vectors/Math
If w = <-8, 15>, find ||w||. A. 7 B. 17 C. 23 D.sqrt 7 E.sqrt 23
April 26, 2013

Calc
Which functions of x and y in terms of time t can be derived from this rectangular equation? (x^2/4)+y^2=1 A. x = 2sin t, y = -cos t B. x = sin t, y = 5cos t C. x = sin t, y = 2cos t D. x = -sin t, y = 2cos t E. x = 2sin t, y = 5cos t
April 26, 2013

Physics
A park ranger wants to shoot a monkey hanging from a branch of a tree with a tranquilizing dart. The ranger aims directly at the monkey, not realizing that the dart will follow a parabolic path and thus will fall below the monkey. The monkey, however, sees the dart leave the ...
April 25, 2013

Physics
Why do the passengers in high-altitude jet planes feel the sensation of weight while passengers in the International Space Station do not? Please help; need an original answer no Google search. Thank you in advance...
April 25, 2013

Physics
What would be the path of the Moon if somehow all gravitational forces on it vanished to zero? Please help; need an original answer no Google search. Thank you in advance...
April 25, 2013

Physics
What would be the path of the Moon if somehow all gravitational forces on it vanished to zero? Please help; need an original answer no Google search. Thank you in advance...
April 25, 2013

Physics
To combat wasteful habits, we often speak of “conserving energy,” by which we mean turning off lights, heating or cooling systems, and hot water when not being used. In this chapter, we also speak of “energy conservation.” Distinguish between these two ...
April 25, 2013

Physics
Why bother using a machine if it cannot multiply work input to achieve greater work output? Please help; need a original answer no Google search. Thank you in advance...
April 25, 2013

Physics
When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?) Please help; need a ...
April 25, 2013

Physics
In grandpa’s time automobiles were previously manufactured to be as rigid as possible, whereas autos are now designed to crumple upon impact. Why? Please help; Thank you in advance for the help...
April 25, 2013

Calc
In the first three days of its launch, the Galaxy Music Store sold 14 CDs of album x, 8 of album y, and 6 of album z through Branch A. Through Branch B, the store sold 7 CDs of album x, 13 of album y, and 4 of album z. Branch C sold 2 CDs of album x, 11 of album y, and 1 of ...
April 25, 2013

Calc
If w = <-8, 15>, find ||w||. A. 7 B. 17 C. 23 D.sqrt 7 E. sqrt 23
April 25, 2013

Calc
Which expression is equivalent to (sin x + 1)(sin x − 1)? A. cos2^x B. -cos2^x C. cos2^x + 1 D. cos^2x − 1 E. -cos^2x + 1
April 25, 2013

Calc
A video games shop is analyzing its sales performance using matrices. Matrix A contains the unit sales data for each product category (horizontally) per week (vertically). Matrix B contains the unit sales data for weekends for each category (horizontally) per week (vertically...
April 25, 2013

Math, Calc
Which rectangular equation corresponds to this set of parametric equations? x = t + 2 and y = t^2 + 3 A. y = (x − 2)^2 − 3 B. y = (x + 2)^2 + 3 C. y = (x − 2)^2 D. y = (x + 2)^2 − 3 E. y = (x − 2)^2 + 3
April 25, 2013

math 7th
Thanks Ms. Sue I see what I forgot to do.
April 24, 2013

math 7th
When the temperature is 68°F, the speed of sound in air is approximately 343 meters per second. Approximately how many kilometers does sound travel in five seconds? Can some one help with the steps?
April 24, 2013

Eco103
Given The demand function of a product q=f (a)= 3600-15p find the maximizes total revenue and quanty sold
April 23, 2013

algebra 2
a two-digit counting number has a value that is 13 greater than 3 times the sum of the digits. If the units digit is 1 greater than the tens digit, what is the number
April 23, 2013

Math
how to you multiply fractions (not mixed numbers)
April 18, 2013

algebra 2
10,000 raffle tickets were sold and you buy 12 tickets. Whats the odds against winning
April 18, 2013

Calc
What is the solution of this system? 2x + 3y = 32 11y − 2x = 52 A. x = 3/2 , y = 5 B. x = 4, y = 8 C. x = 7, y = 6 D. x = 10, y = 4 E. x = 8, y = 16/3
April 18, 2013

Calc
Which expression is equivalent to sin(3x) + sin x? A. 2cos(2x)sin x B. 2sin(2x)sin x C. -2sin(2x)cos x D. 2sin(2x)cos x E. -2cos(2x)sin x
April 18, 2013

Calc
Which rectangular equation corresponds to this set of parametric equations? x = t + 2 and y = t^2 + 3 A. y = (x − 2)^2 − 3 B. y = (x + 2)%2 + 3 C. y = (x − 2)^2 D. y = (x + 2)^2 − 3 E. y = (x − 2)^2 + 3
April 18, 2013

geometry
Is this syllogism? 1. In-line skaters live dangerously. 2.if you live dangerously, then you like to dance. 3, If you are an in-line skater, then you like to dance.
April 17, 2013

geometry
Is this an invaild arguement?
April 17, 2013

Physics
A string of mass 0.0003 kg/m and 0.5m long is vibrating 200 cycles per second. What must be the tension? What hanging mass would produce the tension?
April 16, 2013

Alg 1
also i^2=-1
April 15, 2013

Alg 1
sorry there was a miscalculation. Det x = 1-80=-79 not -39
April 15, 2013

Alg 1
Det x = b^2 - 4ac - formula x = -b +/- sqrt Det x/2a - formula if Det x = 0 then x has only 1 solution Det x > 0 then x has 2 solutions Det x <0 then x has 2 complex solutions - a+ib=z, z is a complex number, i^2=-i, a is the real part b is the imaginary one Det x = 1-40...
April 15, 2013

algebraic systems
ok, so im stumped on this bonus system. there is a hint that the prof. gave that said that all coefficients are 1 or -1. can someone do this and explain how you did it? a + b + c + d + e + f + g + h + k + m = 27 a – b + c + d + e + f + g + h + k + m = 23 a + b - c + d + e...
April 15, 2013

chemistry
net ionic equations for Ca(NO3)2 +NaPO4
April 15, 2013

stats
Cushman and Wakefield accounting that the average annual rent for office space in Tampa was $17.63 per square foot. A real estate agent selected a random sample of 15 rental properties (offices) and found that mean rent was $18.72 per square foot and s= $3.64. At a= 0.05, test...
April 13, 2013

math
All varieties of a certain brand of cookies are $3.50 A person buys peanut butter and chocolate chip cookies. Write an expression that tepresents the total cost.
April 9, 2013

math
All varieties of a certain brand of cookies are $3.50 A person buys peanut butter and chocolate chip cookies. Write an expression that tepresents the total cost.
April 9, 2013

Check answers please Statistics
Suppose that each student in stat. has a 9% chance of missing class on any given day and that student attendance is independent. In a stat. class of 20 students, find the probability that: 1) no student is absent =15.16 2) one student is absent =30 3) three student is absent =...
April 8, 2013

Math Help
Suppose that each student in stat. has a 9% chance of missing class on any given day and that student attendance is independent. In a stat. class of 20 students, find the probability that: 1) no student is absent 2) one student is absent 3) three student is absent 4) at least ...
April 8, 2013

math
Math systems 3x-2y-z=-20 x-y=10
April 8, 2013

stats
The president of a large university wishes to estimate the average age of the students presently enrolled. From past studies, the standard deviation ó is known to be 2 years. A sample of 50 students is selected and the mean is found to be 23.3 years. a. Find the 99% ...
April 7, 2013

stats.
so 2.575=10/what would n be?
April 7, 2013

stats.
One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the ó=10. Find a 99% confidence interval for the mean anger score of the population.
April 7, 2013

stats.
In a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of the people in the city are children.) The study also stated that the standard deviation s was 0.123. Find a 95 % confidence interval for the true mean ...
April 4, 2013

Math- Partial Fractions
Decompose the following into partial fractions after factoring the denominator as much as possible. Please show some work so I can understand how you did it. 1)x^2/((x-1)(x^2+5x+4)) 2)(3x^3-5x^2+12x+4)/(x^4-16) 3)1/(x^2 (x+1)^2 ) 4)(x+1)/((x^2+1) 〖(x-1)〗^2
April 4, 2013

stats
given n=74 an x=32.find ^p and ^q
April 4, 2013

math
the perimeter of a triangle is 79.75 inches. the second side of the triangle is half as big as the first side. the third side is 7.25 in greater than the first side what is the length of the longest side of the triangle?
April 3, 2013

stats.
The mean number of bumped airline passengers per day s 1.35 and the standard deviation is 0.25. For a random selection of a group of 40 days, what is the probability that the mean number of bumped passengers for the 40 days will be between 1.25 and 1.50?
April 2, 2013

stats.
The amount that airlines spend on food per passenger is normally distributed with mean $8.00 and standard deviation $2.00. What is the probability that a randomly selected airline spends more than $12.50.
April 2, 2013

stats
Given a standard normal variable. What is the probability that z lies between 1.48 and 2.13
April 2, 2013

Math
An object at rest begins moving horizontally on the x-axis, starting at position x(t) = 0 feet at time t = 0 seconds.Suppose, after exactly 2 seconds we measure the position of the object to be 3 feet to the right of the origin AND measure the object to be moving to the ...
April 1, 2013

Math/ Calculus Please HELP!!!
hey thanks but i still dont get how you arrived to this answer?
April 1, 2013

Math
how many even 4 digit whole numbers exisit such that the thousands digit it odd all 4 digits different
March 31, 2013

stats
I am so lost I know the mean is 0.504 so is the SEM 1.96?
March 31, 2013

stats
n a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of the people in the city are children.) The study also stated that the standard deviation s was 0.123. Find a 95 % confidence interval for the true mean ...
March 31, 2013

stats
what is n
March 31, 2013

stats
One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the ó=10. Find a 99% confidence interval for the mean anger score of the population.
March 31, 2013

stats
The standard deviations s for the annual medical costs 30 heart disease patients was found to equal $1005. Find a 95 % confidence interval for the standard deviation of the annual medical costs for all heart disease patients.
March 31, 2013

stats
In a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of the people in the city are children.) The study also stated that the standard deviation s was 0.123. Find a 95 % confidence interval for the true mean ...
March 31, 2013

math
thank you
March 28, 2013

math
mary jogged 5 7/10 miles on monday and 4 1/8 miles on tuesday. Raul jogged 6 1/2 miles on monday and 3 4/5 miles on tuesday. How much farther did raul jog on monday than tuesday.
March 28, 2013

algebra
The perimeter of a triangle is 47 miles. The first side is 5 miles less than twice the second and the third is 2 miles more than the first. Find the lengths of each side.
March 28, 2013

math
find the rule: X=8,9, 10,11,12 y=8,10,12,14,16
March 27, 2013

Chem
Calculate [H3O ], [ClO4–], and [OH–] in an aqueous solution that is 0.170 M in HClO4(aq) at 25 °C.
March 27, 2013

history
It is Populist . Correct.
March 25, 2013

Chemistry
Calculate the volume of 0.3MHCL used to neutralise NaOH solution
March 25, 2013

Math/ Calculus Please HELP!!!
A truck driver, on assignment from the owner of the truck is to drive on a 300 mile stretch of highway at a constant speed of v miles per hour. According to road signs, the minimum speed allowed is 55 miles per hour and the speed limit is 70 miles per hour. The cost of gas on ...
March 24, 2013

math
A girl 1.6 m tall, stands 3.6 m from a lamp post at night. Her shadow from the light is 0.9m long. How high is the lamp post?
March 20, 2013

math
the increasing global temperature can be modeled by I=0.1e^(0.02t) where I is the increase in global temperature in degrees Celsius since 1990 and t is the number of years since 1990. How much warmer was it in 2000 than in 1950? iIn what year will the temp be 4 degrees Celsius...
March 18, 2013

Chemistry
Is the dissolution of calcium sulfate endothermic or exothermic? How do you know?
March 17, 2013

stats
The amount that airlines speed on food per passenger is normally distributed with means $8.00 and standard deviation $2.00. What is the probability that a randomly selected airline spends more than $12.50?
March 17, 2013

stat.
The average age of a vehicle registered in the United States is 8 years, or 96 months. Assume the standard deviation is 16 months. If a random sample of a group of 48 vehicles is selected find the probability that the mean of the group’s age is between 90 and 100 months.
March 17, 2013

accounting
Dan and Joan want to buy an airplane. They find one that will cost $200,000. They must pay 10% down, and can get the balance financed with a 10 year loan at 7% interest and annual payments. What is their annual payment? Answer $26,826 $25,626 $24,457 $19,260
March 16, 2013

Chemistry
Write a balanced equation for the following: aqueous barium chloride reacts with aqueous sodium chromate to form aqueous sodium chloride plus solid barium chromate.
March 14, 2013

chemistry
I got .369 g Rh(OH)3. RIGHT?
March 14, 2013

Chemistry
hey i got Sb2O5 for the oxide is O5 right?
March 14, 2013

Ms. Sue please science
yea sweet cheeks;)....your welcome.
March 13, 2013

Chem 1
is there a formula that i am suppose to use?
March 13, 2013

Chem 1
The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0g of luminol into a total volume of 75.0 \rm mL of \rm H_2O. What is the molarity of the stock solution of luminol? 1.13M Before investigating the scene, the technician must ...
March 13, 2013

Physics 11
Sorry, I typed the equation wrong. This is the correct one. "Displacement is given by x=2+3t+4t². Find teh value of instantaneous acceleration." I still don't understand how to go about this. Thanks.
March 13, 2013

physics 11
Displacement i sgivenby x=2+3t+4t2. Find the value of instantaneous acceleration.
March 13, 2013

Life oriantation
Identify 5 practices in above case study that are in contravention of the basic condition of employment act
March 10, 2013

physics
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. As shown is the figure, a polar bear climbs onto a piece of ice, which has a volume of 5.75 m3, and is floating in sea water. a) What is the mass of the piece of ice? b) What is the mass of the ...
March 9, 2013

math
The cashier got 1/3 of the stamps and the secretary got 1/5 of the stamps. The secretary got 40 fewer stamps than the cashier. How many did the cashier receive?
March 8, 2013

Chemistry
Determine the boiling point of a solution contanting 36.1grams calcium chloride molar mass 112 in 200.0grams water.
March 7, 2013

Chemistry
The molal freezing point constant(Kf) for acetic acid is 3.90 C/m. When 31.5 grams of unknown solute is dissolved in 650 grams of acid the freezing point is lowered by 0.79 what is the molar mass
March 7, 2013

Chemistry
How many grams of NH4Br(Molar Mass=98g)are in 440.0 mL of 1.75Moles NH4Br
March 7, 2013

Chemistry
A Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 291 units was obtained for the intensity of the 671 nm red emission line. Then 1.00 mL of a 11.7 mM Lithium standard was added to 9.00 mL ...
March 7, 2013

science
If you are titrating 25.00 mL of a 1.00mg/ml CaCO3 solution, how many mL of 0.010M EDTA solution will be required to reach the equivalence point
March 4, 2013

Physics
A specimen has .625 the amount of carbon 14 you would find in a living specimen. How many half-lives has the specimen been through? How old is the specimen?
March 3, 2013

Physics
A specimen has .625 the amount of carbon 14 you would find in a living specimen. How many half-lives has the specimen been through? How old is the specimen?
March 3, 2013

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