Tuesday

September 1, 2015
Total # Posts: 1,764

**Stats Class HELP!**

Twenty-five blood samples were selected by taking every seventh blood sample from racks holding 187 blood samples from the morning draw at a medical center. The white blood count (WBC) was measured using a Coulter Counter Model S. The mean WBC was 8.636 with a standard ...
*April 18, 2014*

**Stats. Class**

a. What sample size would be needed to estimate the true proportion of students at your college who are wearing backpacks, with 95% confidence and and error of +/-0.04? b. What sampling method would you recommend? Why?
*April 18, 2014*

**Stats Class**

The EPA city/hwy mpg range for a Saturn Vue FWD automatic 5-speed transmission is 20 to 28 mpg. If you owned this vehicle, how large a sample (e.g. how many tanks of gas) would be required to estimate your mean mpg with an error of ±1 mpg and 90% confidence? Explain ...
*April 18, 2014*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*April 15, 2014*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*April 15, 2014*

**statistics**

Which of the following percentiles corresponds to the area beneath the standard normal curve from a z score of-3.00 to + 3.00? a. 98% b. 100% c. 95% d. 99.7%
*April 15, 2014*

**statistics**

Jorge finds that his standardized z score on an IQ is 2.0. What percentage of people did he score higher than? a. 98 b. 96 c. 68 d. 34
*April 15, 2014*

**math**

A jar of coins has only nickels and quarters, which are worth a total of $3.25. There are 5 fewer quarters than nickels. How many quarters and nickels are in the jar?
*April 14, 2014*

**Chemistry**

Based on the mechanisms that you have determined and the information in the introduction, what is the product of 1-cholorobutane after reaction under the sodium iodide conditions? The ethanolic silver nitrate conditions?
*April 14, 2014*

**3 questions~~~**

Thanks so much! I got 100% too!!!
*April 12, 2014*

**9th grade math**

Ok, trent, so if solving for m use this formula: (Google quadratic formula to see formula) so, -b should be 24, b^2 should be -24^2, a should be 4 and c should be 36. The answer should be m=3. -------But if you are to foil this, then 4m^2-24m+36 will be (4m-12)(m-3).
*April 8, 2014*

**Chemistry**

For a reaction that has an equilibrium constant of 9 × 10–9, which of the following statements must be true? A) ∆G° is positive. B) ∆G° is negative. C) ∆H° is negative. D) ∆H° is positive. E) ∆S° is positive.
*April 6, 2014*

**Chemistry**

The standard enthalpy of fusion of iodobenzene is 9.75 kJ/mol at its melting point, 241.8 K. What is the standard change in entropy for the melting of iodobenzene at its melting point? A) –9.75 J/(mol • K) B) –311 J/(mol • K) C) 0.0403 J/(mol • K) D) ...
*March 31, 2014*

**Chemistry**

The presence of ammonia in a solution of AgCl will decrease the solubility of AgCl. True Or False
*March 31, 2014*

**physics**

is it d = 1/2 (9.8) (3)^2 = 44.1 m/s^2/3s =14.7 m/s x 2 = 32.87 = 32.87 mi/h? and b) d= 1/2 (9.8) (3)^2 =44.1 m/s^2/35 = 14.7 m/s
*March 30, 2014*

**physics**

a student drops an object out the window of the top floor of a high-rise dormitory a) neglecting air resistance, how fast is the object traveling when it strikes the ground at the end of 3.0 s? express the speed in mi/h for a familiar comparison, b) how far, in meters, does ...
*March 30, 2014*

**physics**

does this change the answer... the ball is dropped from the top of an 80-m-high building. does the ball reach the ground in 4.0 s? I got no, it falls only 78 m in 4.0 s What speed does the ball in the first question have in falling 3.5 s?
*March 30, 2014*

**physics**

a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s?
*March 30, 2014*

**physics**

a car travels on a straight road. a) starting from rest, the car is going 44 ft/s (30 mi/h) at the end of 5.0 s. What is the car's average acceleration in ft/s^2 b) in 4.0 more seconds, the car is going 88 ft/s (60 mi/h). what is the car's average acceleration for this...
*March 30, 2014*

**physics**

why is it not 30-0/20=1.5 and 5/20=4 km/min = 4,000 m/min = 66.67 m/s?
*March 30, 2014*

**physics**

modern oil tankers weigh more than a half-million tons and have lengths of up to one-fourth mile. Such massive ships require a distance of 5.0 km (about 3.0 mi) and a time of 20 min to come to a stop from a top speed of 30 km/h. What is the magnitude of a such a ship's ...
*March 30, 2014*

**physics**

a race car traveling northward on a straight, level track at a constant speed travels 0.750 km in 20.0 s. the return trip over the same track is made in 25.0 s. a) what is the average velocity if the car in m/s for the first leg of the run? b) what is the average velocity for ...
*March 30, 2014*

**spanish - HELP!**

The answer is nos!
*March 25, 2014*

**AED**

Thank you very much.
*March 20, 2014*

**AED**

I'm guessing for all ages.
*March 20, 2014*

**AED**

As we analyze Western thought vs. Eastern thought, we also should take a look at the application of each school of thought is applied. Lets say that American schools reform to include eastern philosophy in its curriculum. What steps would have to occur to prepare our students ...
*March 20, 2014*

**please answer this one..**

what is the mass in grams of one molecule of water... and is this one different from what is the mass in grans of one mole of water?
*March 19, 2014*

**CHEMISTRY **

What is the mass in grams of one Mole of water?
*March 19, 2014*

**Chemistry**

I believe it's 2.992x10^-23 grams... not sure
*March 19, 2014*

**Chemistry**

what is the mass in grams of one molecule of water?
*March 19, 2014*

**physics **

The angle of incidence and the angle of refraction for light going from air into a material with a higher index of refraction are 69.9° and 39.6°, respectively. What is the index of refraction of this material?
*March 18, 2014*

**Math**

A kite that is 7 feet tall casts a shadow that is 4 feet long. How long would the shadow be if a kite is only 4 feet tall?
*March 18, 2014*

**Chemistry**

A student has 600.0 mL of a 0.30M solution of HNO3. How much water must she add in order to make it a 0.15 M solution? Be careful how this question is answered.
*March 14, 2014*

**math**

A box contains only quarters and dimes. If there 10% more quarters, the total value of the money in the box would increase by 7.5%. What is the ratio of the number of quarters and dimes in the box? Express your answer as a common fraction.
*March 4, 2014*

**math**

Mrs. Marcincavage allowed each student in her math class to drop the lowest of their five test scores. When Matthew dropped the lowest of his test scores, a 60, his test average increased by 5 points. What is Matthew’s new test average?
*March 4, 2014*

**math**

A box contains only quarters and dimes. If there 10% more quarters, the total value of the money in the box would increase by 7.5%. What is the ratio of the number of quarters and dimes in the box? Express your answer as a common fraction.
*March 4, 2014*

**chemistry**

there is a 2 a 2 not 1 but 2KClO3→ 2KCl + 3O2
*March 1, 2014*

**chemistry**

when magnesium chlorate under goes decompostion, oxgen gas is realsed in the following reaction: 2KClO3→ 2KCl + 3O2 repeat 2KClO3→ 2KCl + 3O2 when 3.50 grams of potassuim chlorate is decomposed at STP, how many litters of oxgen will be produced? chemistry - Da
*March 1, 2014*

**chemistry**

magnesium chlorate under goes decompostion, oxgen gas is realsed in the following reaction: 2KClO3 → 2KCl + 3O2 when 3.50 grams of potassuim chlorate is decomposed at STP, how many litters of oxgen will be produced?
*March 1, 2014*

**chemistry**

I said 2KClO3
*March 1, 2014*

**chemistry **

when magnesium chlorate under goes decompostion, oxgen gas is realsed in the following reaction: 2KClO3→ 2KCl + 3O2 when 3.50 grams of potassuim chlorate is decomposed at STP, how many litters of oxgen will be produced?
*March 1, 2014*

**Chemistry**

Oh, alright. thanks though x)least i know im not the only one missing something
*February 24, 2014*

**Chemistry**

Really? My college professor marked it wrong on my work.. thats exactly what i had -_-
*February 24, 2014*

**Chemistry**

name the ions: Ag+ and P-3... and it's not silver..
*February 24, 2014*

**Chemistry**

How many grams of AL(NO3)3 are produced when 23.5 grams of Aluminum react with 133 mL of 6.5M HCL?
*February 23, 2014*

**Chemistry help**

A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.77 nm. It then gives off a photon having a wavelength of 94 nm. What is the final state of the hydrogen atom?
*February 20, 2014*

**College Algebra**

A ball is thrown upward with an initial velocity of 48 ft/sec from a height 640 ft. Its height h, in feet, after t seconds is given by h(t)=-16t^2+48t+640. After how long will the ball reach the ground?
*February 20, 2014*

**Chemistry**

At noon on a clear day, sunlight reaches the earth\'s surface at Madison, Wisconsin, with an average power of approximately 7.00 kJ·s–1·m–2. If the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 8.40 ...
*February 19, 2014*

**TN History**

Ive figured most out now, but i dont know how the state government in tn restore after the reconstruction era.. any book or website that would help answering this. ive tried for a while now and im not making any progress with this one single question.
*February 18, 2014*

**TN History**

Im not sure. It did help the slaves, but the whites didnt handle it all that well... they formed the KKK and right after this, the Confederates changed laws. so im not too sure...
*February 18, 2014*

**TN History**

how well did Tennessee deal with the four issues of Reconstruction; the status of its former Confederates, the restoration of the state government, economic reconstruction, and the status of former slaves? (Just one sentence would help me a lot... i know a lot of info but not ...
*February 18, 2014*

**English**

What resource whether its online etc can LGBT community support, how can they get help? Thanks!
*February 15, 2014*

**physics **

A stereo speaker represented by P in the figure below emits sound waves with a power output of 114 W. What is the intensity of the sound waves at point x when r = 11.8 m?
*February 12, 2014*

**math**

What is the approximate circumference of a pizza pan with a diameter of 13.2 inches? (Use π = 3.14)
*February 5, 2014*

**physics**

The wavelength of a pulse is 0.1925mm. There are 5 cycles in the pulse. What is the spatial pulse length?
*February 5, 2014*

**physics**

The pulse duration of the transducer is 0.6 microseconds. The frequency of the transducer is 8MHz. How many cycles are contained in that pulse?
*February 5, 2014*

**physics**

what is the propagation speed of a 5MHz transducer?
*February 5, 2014*

**physics**

The medium would be soft tissue. The speed in soft tissue is 1540 m/s.
*February 5, 2014*

**physics**

What is the wavelength of a 4MHz transducer?
*February 5, 2014*

**physics**

Yes, all my questions are for ultrasound physics. I should've mentioned that, sorry. Thanks for the help
*February 5, 2014*

**physics**

If an ultrasound beam at the focal zone has a power of 0.050 watts and the area at this focal zone is 4cm^2, what is the intensity of the beam?
*February 5, 2014*

**Physics**

I know the formulas, just having problems with the right units. I got 1205 Hz for this one????
*February 5, 2014*

**Physics**

If the period of a transducer is 0.83msec, what is the HZ?
*February 5, 2014*

**physics**

so would it be 0.2 microseconds? I just want to make sure I am understanding it correctly, with the correct units, thanks
*February 5, 2014*

**physics**

If the frequency of a transducer is 5MHz, what is the period?
*February 5, 2014*

**Chemistry**

The FDA recommends that women who are pregnant avoid eating more than three 6.00-oz servings of bluefish per month because of the relatively high mercury levels in that type of fish. If bluefish contains 0.341 ppm of mercury (that is, 0.341 oz of mercury per 1×106 oz of ...
*February 1, 2014*

**Chemistry**

An office heater puts out 2070 Btus (British thermal units) of energy in the form of heat per hour. Given that 1 Btu = 1.055 kJ, how many megajoules of energy in the form of heat can be produced per year (365 days) by the heater (assume continuous operation)?
*February 1, 2014*

**physics**

the total electric field e consists of the vector sum of two parts. one part has a magnitude of e1 = 1284 n/c and points at an angle θ1 = 30° above the +x axis. the other part has a magnitude of e2 = 1833 n/c and points at an angle θ2 = 62° above the +x axis...
*January 31, 2014*

**Chemistry**

A particular MP3 encoder can convert 79.0 kilobytes (kb) of music per second from a typical music CD. How many minutes will it take to convert 13.3 megabytes (Mb) of music from a CD?
*January 29, 2014*

**Algebra**

ok thanks
*January 22, 2014*

**Algebra **

Jena wants to paint the walls in her square shaped bedroom. each wall has an area of 130 sq ft. if one quart of paint covers 150 sq ft, how many quarts of paint will she need to buy to paint all four walls? Would I leave it 4.6 or round up to five quarts?
*January 22, 2014*

**someones GOTTA help me with this science...!!!**

1. B 2. A 3. C 4. D 5. A I'm in Connexus as well, and I got a 100% with those answers:)
*January 20, 2014*

**physics**

How long will it take a sample of polonium-210 with a half-life of 140 days to decay to one-sixty-fourth of its original strength?
*January 15, 2014*

**Science**

I mean I would like to know how to work it out and not just get the answer but thanks for the help.
*January 14, 2014*

**Science**

What is the radius in nm of the electron orbit of a hydrogen atom for n=3? What is the radius in nm of the electron orbit of a hydrogen atom for n=4?
*January 14, 2014*

**math**

A florist had an equal number of red and yellow tulips. She sold 624 red tulips. Then she had 4 times as many yellow tulips as red tulips. How many tulips did she start with? You must use a bar model to solve this problem.
*January 12, 2014*

**science please check my answer**

How do I find the average acceleration of the ball?
*January 11, 2014*

**science please check my answer**

I got 57. 06 N, is that correct?
*January 11, 2014*

**science please check my answer**

A boy climbs to the roof of his house and drops a 0.40 kg rubber ball from the 7.5-meter peak of the house. How much energy was lost in the process? So I got 48 J is this correct? The bounce takes place over a 170 ms time interval. What is the impulse given to the ball during ...
*January 11, 2014*

**science**

A boy climbs to the roof of his house and drops a 0.40 kg rubber ball from the 7.5-meter peak of the house. How much energy was lost in the process? The bounce takes place over a 170 ms time interval. What is the impulse given to the ball during this time?
*January 10, 2014*

**Algebra **

Explain why n*0=0
*January 9, 2014*

**Math**

Write the equation of the line in standard form: (-3, 6); m = 1/2 (1, 0) & (-5, 3) Write the equation of the line perpendicular to 4x – 5y = -10 through the point(2, 3). Write the equation in slope intercept form.
*January 8, 2014*

**Math**

Write the equation of the line in slope intercept form: (4, 7); m = -3/8
*January 8, 2014*

**Math**

They all equal 3/4 cool thanks
*January 8, 2014*

**Math**

For the data in the table, does y vary directly with x? If it does, write an equation for the direct variation. X 52 = 32 = 20 = 8 Y 39 = 24 = 15 = 6
*January 8, 2014*

**Math**

Part 1: When writing linear equations, how do you determine which form of a line to use? Part 2: Choose 1 set of points from the choices below. Then, solve the problem and post your solution, showing your steps. Write an equation in point-slope form for the line that passes ...
*January 8, 2014*

**Math**

Find the range of each function for the given domain. 1. f(x) = -2x + 1; {-6, -2, 0} 2. f(x) = x3 + 1; {-2, -1, 3}
*January 7, 2014*

**Algebra**

Help Please Write a function rule that represents each sentence. 1. 11 less than the product of a number y and -2 is z. 2. 5 less than the quotient of a number n and 4 is m.
*January 7, 2014*

**chemistry**

1- A compound is 87.5% nitrogen and 12.5% hydrogen. The molecular weight of the compound is 32 g/mol. Describe the molecule referencing shape, and inter-molecular forces. 2- Gaseous butadiene, C4H6 , reacts with hydrogen gas in the presence of a platinum catalyst to form ...
*January 6, 2014*

**chemistry**

Consider the following reaction: CH3X + Y CH3Y + X At 25oC, the following two experiments were run, yielding the following data: Experiment 1 : [Y]0 = 3.0 M [CH3X] Time(hr) 7.08 x 10-3M 1.0 4.52 x 10-3M 1.5 2.23 x 10-3M 2.3 4.76 x 10-4M 4.0 8.44 x 10-5M 5.7 2.75 x 10-...
*January 6, 2014*

**Physics**

Mutiple choice: A car travelling at 10 m/s accelerates at 3 m/s^2. Its new velocity is A.) 12 m/s B.) 22m/s C.) 17 m/s D.) Can not be determined. Which of the following is not acceleration? A.) rate of change of speed in a particular direction B.) rate of change of motion in a...
*December 17, 2013*

**Physics**

The innerspring mattress on your grand- mother’s bed is held up by 23 vertical springs, each having a spring constant of 6000 N/m. A 43 kg person jumps from a 1.93 m platform onto the innersprings. The acceleration of gravity is 9.8 m/s2 . Assume: The springs were ...
*December 16, 2013*

**physics**

A child and sled with a combined mass of 47.4 kg slide down a frictionless hill that is 8.61 m high. If the sled starts from rest, what is its speed at the bottom of the hill?
*December 5, 2013*

**math**

Angela scored in the 90th percentile of her class math test. If 27 students scored the same as or lower than she did, how many students are in the class?
*December 5, 2013*

**math**

In a game played with 50 letter tiles, 21 of the tiles are vowels. If a tile is drawn at random, what is the probability that it is a consonant.
*December 5, 2013*

**math**

A recipe for a fruit shake calls for 5 parts milk, 3 parts banana puree, and 2 parts strawberry juice. Find the quantity of each ingredient necessary to make an 8 ounce shake.
*December 5, 2013*

**math**

A laptop that originally cost $1,200 is on sale for $950. Find the discount rate.
*December 5, 2013*

**Algebra 1 **

Name the property that is demonstrated by the example. 1. (2x)^3=2^3*x^3=8x^3 I am not sure what to put
*December 2, 2013*

**MATH :)**

For each of the following measurements state the number of significant digits: A length of 2.3 meters A volume of 0.65 liters A time of 0.0004 secs A population of 65,000,000 A distance of 1.30 x 104 I got: 1. 2 2. 2 3. 1 4. 2 5. 2 Just need someone to check my answers please ...
*November 30, 2013*

**Algebra 1**

oh thanks
*November 25, 2013*