Tuesday
August 4, 2015

Posts by Scott


Total # Posts: 585

Algebra
The boat travels 60 miles to an island and the same 60 miles coming back. Changes in the wind and tide made the average speed on the return trip 3 mph slower than the speed on the way out. If the total time of the trip took 9 hours, find the speed going to the island and the ...
August 1, 2015

math
express a single logarithm 1/3 log(b, x+3) log(b, y-4) log(b, x)
June 23, 2015

math
$8669.93
June 23, 2015

physics
A body is projected at an angle of 30degree to the horizontal with a velocity of 150metre per seconds.Calculate the time it takes to reach the greatest height,take g=10metre per seconds square and neglect air resistance.
June 18, 2015

math
A can of oil is 8 inches high and 8 inches in diameter. What is the approximate volume of the can?
June 6, 2015

Physics
A person whose mass is m = 96.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 15.3° with the horizontal. What is the reading on the scale?
May 28, 2015

Statistics
The manager of a company wants to investigate job satisfaction among its employees. One morning after a meeting, she talks to all 25 employees who attended. Does this sampling plan result in a random sample? What type of sample is it? Explain.
May 13, 2015

math
Why does Zara have a good driving record?
April 26, 2015

Statistics
Sammy and Sally each carry a bag containing a banana, a chocolate bar, and a licorice stick. Simultaneously, they take out a single food item and consume it. The possible pairs of food items that Sally and Sammy consumed are as follows. chocolate bar - chocolate bar licorice ...
April 13, 2015

Calculus
In a poll of 400 voters in a certain state, 61% said that they opposed a voter ID bill that might hinder some legitimate voters from voting. The margin of error in the poll was reported as 4 percentage points (with a 95% degree of confidence). Which statement is correct? A. ...
April 9, 2015

Calculus
Joe dealt 20 cards from a standard 52-card deck, and the number of red cards exceeded the number of black cards by 8. He reshuffled the cards and dealt 30 cards. This time, the number of red cards exceeded the number of black cards by 10. Determine which deal is closer to the ...
April 9, 2015

Algebra
(8,3);y=-1/4x+7
March 19, 2015

Statistics
A researcher predicts that watching a film on institutionalization will change students’ attitudes about chronically mentally ill patients. The researcher randomly selects 36 students, shows them the film, and gives them a questionnaire about their attitudes. The mean ...
March 16, 2015

Physics
What is the volume of water at 95 degrees Celcius if at 5 degrees Celcius the water is 5.56L?
March 11, 2015

Physics
A raft measures 1.7m x 0.67m x 0.14m, and it has a mass of 13.5kg. What is the maximum mass that the raft can hold and still stay afloat
March 11, 2015

not school
Needing help setting up equation.if 1/4 of inch is equal to one foot of actual size dimension,determine the length represented by 7/8.is it a division problem.and if so he would I write it out
March 11, 2015

chemistry
1. formula for Molality = n(solute)in mol/(m(solvent)) in (Kg) so: first convert mass of C7H8 into moles, then divide that by the mass of cyclohexane, which in this case is 15.8 g, then multiply by 1000 to convert to Kg. Report the answer to three significant figures. Ans: ...
February 9, 2015

Math
What simplified common fraction is equivalent to 0.05757575757
January 24, 2015

accounting
The Bean Company makes a sale with an invoice price of $97,000 on 10/1/14. The note is due on 10/1/17. There is no interest rate stated in the note. The market rate for similar notes is 10%. Assume annual compounding of interest. Prepare the journal entries for 10/1/14, 12/31/...
January 19, 2015

math
in a group of 180 person composed of men, women and children there are twice as many men as women and three times as many women as children. how many are there each?
November 9, 2014

Algebra
A woman invests $15000 in 2 separate investment accounts. One account earns 5.1%, one earns 4.2% simple interest. If she earns $21 in interest total, how much did she earn from each account. I keep getting x to be 67,666.67 by getting to this equation: .051x + .042(15000-x) = ...
October 28, 2014

Math
Eight-ninths of a bunch of marbles remain on a table. The square root of half the total number of marbles have rolled away. Also, the two children who are playing with the marbles each hold one marble. Find the total number of marbles in the bunch.
October 20, 2014

math
Jason took 3/4 of an hour to paint 27 1/3 square yards. How many square yards does he paint per hour?
September 24, 2014

physics
A bullet is fired through a wooden board with a thickness of 8.0 cm. The bullet hits the board perpendicular to it, and with a speed of +350 m/s. The bullet then emerges on the other side of the board with a speed of +210 m/s. Assuming constant acceleration (rather, ...
September 11, 2014

science
h1 = -1/2 g t^2 + 100 h2 = -1/2 g t^2 + 50 t the balls cross when h1 equals h2 looks like 2 sec
September 10, 2014

math
12.5= 3/k how do u solve k?
August 7, 2014

physics
A.) the height of the slope is ___ 500m * sin(24º) GPE = m g h b.) .2 m g h = 1/2 m v^2 .4 g h = v^2
July 14, 2014

Math
the probability of at least one being defective equals 1 minus the probability that all three are good 1 - (5/8)^3 = .756 (approx)
July 10, 2014

Lea408
can someone please tell me if I am right Like optical scanners, capacitance fingerprint scanners generate an image of the ridges and valleys that make up a fingerprint. But instead of sensing the print using light, the capacitors use electrical current. (Points : 1) True False...
June 8, 2014

Chemistry
a sulfuric acid solution that is 65.0 h2so4 by mass has a density of 1.55 g/mL. What is the molality of sulfuric acid in this solution
May 31, 2014

Data Management
In a multiple choice test that contains ten questions with each question having five possible answers, what is the probability that Colin will pass the test if he merely guesses at each question?
May 22, 2014

statistics
A test designed to check for sickle-cell anemia has an 85% chance of detection in that, if a person has the disease, there is an 85% chance that the test will be positive. And, if the person does not have the disease, there is an 85% chance that the test will be negative. We ...
May 13, 2014

statistics
A laptop computer manufacturer found that by improving their battery design, they could increase the time that the laptop computer could be used on a single charge. To verify this improvement, they compared a sample of 10 laptops installed with the improved batteries to a ...
May 13, 2014

statistics
Five coins all balanced the same were tossed 150 times. Note that, while the coins are all balanced the same, they may or may not be fair coins. Since five coins were tossed, the possible number of heads for each toss could be zero through five. The following table gives the ...
May 13, 2014

CRJ
Please advise if I am right or wrong thanks
May 4, 2014

CRJ
7. D 8. B 9. B 10.A
May 4, 2014

CRJ
I think I know the answers could you please tell me if I am right 1. c 2. D 3. B 4. D 5. D 6. B 7. 6. 7. 8. 9. 10.
May 4, 2014

CRJ
1. Which of the following was an impact on policing as a result of WWII? (Points : 1) The Pendelton Act An increase in educational requirements for police A shortage of experienced officers The adoption of residency requirements for police Question 2. 2. The Pendelton Act of ...
May 4, 2014

LEA201
Conduct an analysis of community policing with regard to the impacts pertaining to law enforcement administration. Thoroughly compare and contrast the aspects of community policing that are significantly influenced by the public interaction and political influence. As a police...
May 1, 2014

LEA 201
Conduct an analysis of community policing with regard to the impacts pertaining to law enforcement administration. Thoroughly compare and contrast the aspects of community policing that are significantly influenced by the public interaction and political influence. As a police...
April 30, 2014

statistics
Which of the following statements is correct? A. An extremely small p-value indicates that the actual data differs markedly from that expected if the null hypothesis were true. B. A large p-value indicates that the data is consistent with the alternative hypothesis. C. The p-...
April 25, 2014

Chemistry
What mass of NaOH is required to create 500 mL of a .4 M solution of Sodium Hydroxide(aq)?
February 13, 2014

SCIENCE HELP PLEASE
NO we always see the same side of the moon because its rotational period is the same as its orbital period (about 28 days) if the moon rotated every 24 hrs (like Earth), then you would see different parts of the moon during its orbit
January 8, 2014

math
Three times as many childeren as adults attended a concert on Saturday. An adult ticket is $7 and a child's ticket is $3. The theater collected $6000. How many people bought tickets?
November 4, 2013

Math
the .88 is okay, but the exponent is not actually, there is supposed to be one digit to the left of the decimal point 8.8x10^-3 the exponents are subtracted when dividing (1.23/1.4)x10^(-10 - -8) = .88x10^-2 ___ = 8.8x10^-3
October 17, 2013

Physics
the net acceleration is ___ g sin(16.9º) - (4.1×103 N / 3.5 × 103 kg) divide the speed at the bottom by the acceleration to get the time for the trip the average speed is (0 + 4.2) / 2 speed times time is distance (the length of the driveway)
October 17, 2013

physics
the spring compresses until the spring force equals the applied force 14 N = x * 5.0×10^2 N/m
October 17, 2013

physics
w = 1/2 k x^2 where x is the distance stretched
October 17, 2013

physics
the component of gravitational acceleration parallel to the slope is ___ g sin(30º) the force on the skier is ___ m g sin(30º)
October 16, 2013

phyics
with the plane starting from rest and a uniform acceleration, the average velocity is 20 m/s so the time of acceleration is 184/20 or 9.2 s the acceleration is (40 m/s) / 9.2 s
October 15, 2013

physics
the bank angle provides the necessary centripetal force m * v^2 / r = m * g * sin(θ) * cos(θ) convert v to m/s, then solve for r
October 15, 2013

Math
there are three pairs of matching sides two are L x W ___ 2 * 7 * 3 two are L x H ___ 2 * 7 * 9 two are W x H ___ 2 * 3 * 9 find the areas, add them together multiply by the paper cost
October 9, 2013

Physics
the momentum of the system stays constant ___ 94 * .49 forward throw (94 - .27)x + (.27 * 15) = 94 * .49 backward throw (94 - .27)x - (.27 * 15) = 94 * .49
October 8, 2013

college math
.00001 - .0001 10^-5 - 10^-4 -9x10^-5 ___ -.00009
September 30, 2013

ap chemistry
a Coulomb ≈ 6.24x10^18 electrons find the number of moles in 96.5 kC (by multiplying) this equals the moles of Ag produced mass = moles * molar mass
September 28, 2013

physics
your calculated v will be in m/s the question asks for rpm 60 s in a min and circumference = 2πr (60 v) / (2 π r)
September 28, 2013

PHYSICS
f = m a tension = (3.8 * 2.1) + (3.8 * g)
September 28, 2013

Physics
the work is equal to the change in the (kinetic) energy of the truck w = (1/2 m 25^2) - (1/2 m 13^2) w = 1/2 * 8000 * (25^2 - 13^2)
September 28, 2013

math
(15 + 14 + 13 + 12 + 11 + ...) minus (12 + 11 + 10 + ...)
September 28, 2013

physics
no
September 26, 2013

Physics
t is the time for Tina to catch David 1/2 a t^2 = v t 1.45 t^2 = 24 t 1.45 t^2 - 24 t = 0 t = 24/1.45 distance = 24 * 24/1.45 speed = accel * t = 2.9 * 24/1.45
September 26, 2013

physics
the velocity changes by 9 m/s (27 - 18) this takes approx. 2.6 s (9 / 3.5) the average velocity is 22.5 m/s ___ (27 + 18) / 2 the distance traveled is velocity multiplied by time
September 26, 2013

science
power = work / time p = (1000 * m * g * h) / (30.0 min * 60 s/min) p = (1000 * 196)j / 1800 s (watts)
September 25, 2013

science
p.e. = m * g * h 10.3 kj = 5.20 kg * 9.8 m/s^2 * h 10.3 k / (5.2 * 9.8) = h (in meters)
September 25, 2013

Phyics
the rocket attains a velocity of 75.5 * 1.58 or 119.3 m/s since it started from zero, the average velocity for the 1st part of the flight is 119.3/2 or 59.65 m/s it runs out of fuel at a height of 1.58 * 59.65 or 94.24 m in the 2nd part of the flight, the rocket is decelerated...
September 25, 2013

physics
the velocity in the x-direction is constant the penguin is accelerated in the y-direction by the wind a = f / m = .45 / 5.7 v = a * t the x-velocity and y-velocity add as vectors to give the net velocity (vx)^2 + (vy)^2 = v^2
September 25, 2013

physics
push off from your backpack as hard and fast as you can, towards the shore you and your backpack will gain equal amounts of momentum you will slide to solid ground and your backpack will end up on the opposite shore
September 25, 2013

Physics
the net work done on the car, by the driver, is ZERO the force is applied internally to the moving reference frame of the car this would be like sitting in a wagon and trying to move it by pushing on the inside -- no net work
September 25, 2013

Physics
the work stretching the spring equals the change in the gravitational potential energy 1/2 * k * x^2 = m * g * x 37 x^2 = 3.3 * 980 * x = 3234 x x^2 - (3234/37)x = 0 x = 3234/37
September 24, 2013

physics
gravity provides a downward acceleration of 9.8 m/s^2 so the bungee cord is providing an upward acceleration of 1.4 m/s^2 (9.8 - 8.4) the force is upward with a magnitude of 65 kg * 1.4 m/s^2
September 24, 2013

Phyics
velocity = acceleration * time her acceleration is zero for the rest of the race, so her velocity stays constant
September 24, 2013

Biology
Describe how enzymes affect chemical reactions and explain why this makes enzymes important to living things. I need help this will be on my test I am studying for.
August 28, 2013

math
how many ways can a 3 person subcommittee be selected from a committee of 7 people
July 31, 2013

math
using simple interest on a loan at 8.4% for one year making monthly payments. Find the APR on a $5000 loan.
July 31, 2013

Math
Heather has divided $8000 between two investments, one paying 8% and the other paying 6%. If the return on her investment is $550 how much does she have in the larger investment?
July 31, 2013

Math (probability)
Real Estate ads suggest that 50% of homes for sale have garages, 24% have swimming pools, and 11% have both. If a home for sale has a garage, what's the probability that it has a pool too? Write as a decimal.
July 27, 2013

Math
What is the cubic feet of a concrete slab 20ft x 30ft x 6" thick.
July 18, 2013

Math(reiny)
On the earlier questin would the speed be faster not slower?
July 11, 2013

Math
Over a fixed distance speed r varies inversely as time t. If the speed of a car is 30 mph when the time is 6 seconds what would the speed be of the car if the time was 4 seconds
July 11, 2013

physics
m * g * h 80.4 * g * 2630 * sin(19.4º)
July 8, 2013

science
a substance going into solution has no effect on the weight the weight of the solution is the weight of the solvent plus the weight of the solute
July 8, 2013

chemistry
.1M * (45.5 / 50)
July 7, 2013

physics
the two particles experience the same force (the tension in the string) since A has twice the mass of B, its acceleration will be half of B's so A's final velocity will be half of B's (1/2 * 2kg * v^2) + (1/2 * 1kg * (2v)^2) = 12J 2 v^2 + 4 v^2 = 24 v^2 = 4 ___ v...
July 7, 2013

Algebra 2
the probability of NOT getting a particular glass on any visit is 4/5 or .8 the probability of NOT getting a particular glass on 15 visits is .8^15 the probability of getting a particular glass in 15 visits is 1 - .8^15 the probability of getting all 5 glasses in 15 visits is...
July 6, 2013

physical science
the tension in the string provides the force for the centripetal acceleration of the stone f = m * v^2 / r = 1 * 5^2 / .5 the force is in Newtons
July 6, 2013

physics
If a metal wire carries a current of 79 . 0 mA, how long does it take for 7.90 × 10 20 electrons to pass a given cross-sectional area anywhere along the wire? The fundamental charge is 1 . 602 × 10 − 19 C. Answer in units of s
May 21, 2013

Chemistry
n and inQ are doubled EAo and E have no change Q is squared
May 8, 2013

math
How much paper is used for a label on a can of frosting. The height of the jar is 5 inches and the radius is 1.5 inches I did SA=2TTrh+2TTr^2 SA=2TT1.5(5)+2TT1.5^2 SA=15TT + 2TT2.25 SA=15TT=4.5TT SA=19.5TT SA=61.261 SA=61.3in^2 61.3in squared of paper was used for the label ...
March 18, 2013

physics
Consider a pendulum of length 4.720 m. The acceleration of gravity is 9 . 832 m / s 2 . a) What is its period at the North Pole? Answer in units of s 009 (part 2 of 6) 10.0 points b) What is its frequency? Answer in units of Hz
March 17, 2013

Math
Aubrey spent 2/7 of her money and gave 1/4 of the remaining money to her hungry parents. she had $120 left. How much did she have left?
March 14, 2013

Algebra
I need to factor out the greatest common monomial factor: 1) 20x^2y^2 - 4xy 2) 18s^2t^5 - 2s^3t 3) -2g^4 +14g^2 + 6g
March 12, 2013

Algebra
I need to solve these equations : 1) 5w^2 - 5w = 0 2) 2x^2 + 15x = 0 3) -32y^2 - 24y = 0 4) 6h^2 = 3h 5) -42z = 14z 6) -12p^2 = -30p
March 12, 2013

Algebra
How do I factor out the greatest common monomial factor? 1) 9m^7 - 3m^2 2) 12a^5 + 8a 3) I need to describe and correct the error in facotring out the greatest common monomial factor of 18x^8 - 9x^4 - 6x^3 18x^8 - 9x^4 - 6x^3 = 3x(6x^7 - 3x^3 - 2x^2) is INCORRECT
March 12, 2013

geometry
4. In order to properly design a heating system for a greenhouse, the volume of air in the building needs to be determined. Find the volume of air in the greenhouse below. The length of the building is 40 feet long, the width is 20 feet long, and it is 8 feet from the ground ...
March 1, 2013

Analytical Chemistry
if you use the pk2 wouldnt you get a negative value for nah2po4?
February 22, 2013

physics
A steam engine’s boiler completely converts 151 kg of water to steam. This process in- volves the transfer of 4.8786 J J as heat. If steam escaping through a safety valve does 1.66 × 108 J of work expanding against the outside atmosphere, what is the net change in ...
February 19, 2013

physics
A person takes in a breath of 27C air and holds it until it warms to 36.5C. The air has an initial volume of 0.39 L and a mass of 0.00077 kg. Determine the work done by the air on the lungs if the pressure remains constant at 1 atm. Answer in units of J
February 19, 2013

Math/Physics
What is an expression for the standing wave that is produced by adding the two waves (2.5 cm)sin[(3.0 m-1)x - (27 s-1 )t] and (2.5 cm)sin[(3.0 m-1)x + (27 s-1)t]
January 30, 2013

Physics
Air is vibrating in a tube (closed at both ends) at its fundamental frequency of 160 Hz. If the tube is filled with helium instead, what is its fundamental frequency? Use 1020 m/s for the speed of sound in helium.
January 30, 2013

Physics
If the seventh and fourth standing wave frequencies of a string differ by 144 Hz, what is the fundamental frequency of the string?
January 30, 2013

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