Wednesday

September 2, 2015
Total # Posts: 2,376

**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*

**Combinations and Permutations, Steve and Ms. Sue☺**

Made a 100% because of you Hailee :D
*April 10, 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*

**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*

**Basic Chemistry (Science)**

Determining Chemical Formulas? This was on my test a few days ago for Basic Chemistry, I received 8/20 and I'd really like to see how to work these problems out. *PLEASE SHOW WORK*. Their are four parts to this, If anyone could answer all four with easy explanations and ...
*March 3, 2013*

**chemistry**

Determining Chemical Formulas? This was on my test a few days ago for Basic Chemistry, I received 8/20 and I'd really like to see how to work these problems out. *PLEASE SHOW WORK*. Their are four parts to this, If anyone could answer all four with easy explanations and ...
*March 2, 2013*

**Honors Application **

I am filling out an Honors application for English/History and one of the questions asked why do I wish to take this course.. any ideas? Thanks My ideas are: I want want to take this course because I want to take a class that is a bit more advanced than regular classes.
*February 24, 2013*

**Biology**

Answer
*February 22, 2013*

**Biology **

Please Help Quick,Write Out The Balanced Chemical Equation For Respiration In An Athlete In A Race.
*February 22, 2013*

**Organic**

Na2wo4 ---------------> H2o2 PTC khso4
*February 21, 2013*

**Organic**

Balanced reaction for cyclohexene to adipic acid. Used na2wo4 with h2o2, PTC, and khso4.
*February 21, 2013*

**IST Subnetting**

Please fill out the form below: Subnet Mask- Broadcast Address-
*February 20, 2013*

**IST Subnetting**

The question is to describe the subnetwork with the least amount of hosts to accommodate 100 computers, calculate the subnet mask and what is the broadcast address for this network.
*February 20, 2013*

**IST Subnetting**

You want to create a subnetwork of at least 100 computers. Currently your network is 172.21.0.0/16. Describe the subnetwork with the least amount of hosts that can accommodate 100 computers and calculate the subnet mask. What is the broadcast address for this network?
*February 20, 2013*

**IST Subnetting**

You have 5 subnets with approximately 300 hosts on each subnet. Within the next 6 months, the number of subnets could increase to more than 100. The number of hosts on each subnet will probably never be more than 2,000. You do not have any plans to connect to the Internet ...
*February 20, 2013*

**Math**

i just found out the answer should be that lilly has to redo her calculations because her calculations are off. core math
*February 20, 2013*

**Math**

there are no dividend or divisor. The question is exactly as written.
*February 20, 2013*

**Math**

Lily estimated a quotient of 120 and found an actual quotion of 83. What should she do next? Explain.
*February 20, 2013*

**Earth Science**

faunal successsion
*February 20, 2013*

**7th Grade Math**

5. Park Rangers wanted to estimate the total number of wild mustangs in Central Oregon. They tagged 30 wild mustangs and sent them back to the herd. They recorded the mustang population once a month for the next three months as shown below. Month 1 Month 2 Month 3 tagged ...
*February 19, 2013*

**math**

volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital volume reading was 0.10 ml? [assume the density of water is 1.00g/mL]
*February 18, 2013*

**Trig**

Three circles with radii of 4, 5, and 6 cm, respectively, are tangent to each other externally. Find the angles of the triangle whose vertexes are the centers of the circles.
*February 17, 2013*

**Trig**

The diagonals of a parallelogram intersect at a 42◦ angle and have lengths of 12 and 7 cm. Find the lengths of the sides of the parallelogram. (Hint: The diagonals bisect each other.)
*February 17, 2013*

**math**

a ribbon is 45 cm long is cut into 2 pieces one piece is 4 times longer then the other find the length in cm of both ribbons
*February 11, 2013*

**physics**

charge A has a charge of 2C, Charge B has a charge of -3C and is located 1 meter to the right of A. Charge C is located 1 meter to the right of charge B and has a charge of -1C. if a fourth charge (charge D) is placed 4 meters to the right of charge B, how much charge must it ...
*February 11, 2013*

**A2 Chemistry**

This question is about the unnecessary production of carbon dioxide Outdoor flames, such as patio heaters and the Olympic flame, contribute to global warming. This is not only due to the heat released, but also due to the carbon dioxide produced from the combustion of ...
*February 11, 2013*

**intro to physical science**

the specific heat of granite is 0.80 KJ/kg . c. I f 1.6 MJ of heat are added to a 100-kg granite statue of James Precott Joule that is originally at 18 C, what is the finale temperature of the statue
*February 11, 2013*

**intro to physical science**

what is the Celsius equival of a temperature of 160 F
*February 11, 2013*

**chemistry**

How many grams of rubidium chloride are present in 125.0 mL of a 1.75M RbCl solution?
*February 7, 2013*

**chemistry**

What is the volume in liters of a 0.760M K3PO4 solution containing 220.9g of potassium phosphate?
*February 7, 2013*

**Physics**

A person can jump a maximum horizontal distance (by using a 45 degree projectile angle) of 3 m on Earth. The acceleration of gravity is 9.8 m/s2. What would be his maximum range on the Moon, where the free-fall acceleration is g/6 ? Answer in units of m
*February 7, 2013*

**Physics**

A person can jump a maximum horizontal distance (by using a 45 percent projectile angle) of 3 m on Earth. The acceleration of gravity is 9.8 m/s2. What would be his maximum range on the Moon, where the free-fall acceleration is g/6 ? Answer in units of m
*February 5, 2013*

**Physics**

You are standing at the top of a cliff that has a stair step configuration. There is a vertical drop of 7 m at your feet, then a horizontal shelf of 8 m, then another drop of 3 m to the bottom of the canyon, which has a horizontal floor. You kick a rock, giving it an initial ...
*February 5, 2013*

**Physics**

A ball is thrown straight upward and returns to the thrower’s hand after 2 s in the air. A second ball is thrown at an angle of 38 degrees with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown ...
*February 5, 2013*

**Physics**

A boat must cross a 260-m-wide river and arrive at a point 110 upstream from where it starts. To do so, the pilot must head the boat at a 45 degree upstream angle. THe current has speed 2.3 m/s. a) What is the speed of the boat in still water? b) How much time does the journey...
*February 5, 2013*