Friday
August 1, 2014

Posts by d


Total # Posts: 290

Stats
the average placement test score of a sample of 64 students out of 1000 registered at a community college is 70 with a standard deviation of 15. Construct a confidence interval with a 5% chance of error.

chemistry
Question Part Points Submissions Used A swimming pool, 20.0 m ✕ 12.5 m, is filled with water to a depth of 3.85 m. If the initial temperature of the water is 18.9°C, how much heat must be added to the water to raise its temperature to 28.7°C? Assume that the de...

Geometry
Can you please explain this to me?

Geometry
Find the area of the composite figure(right triangle), where the hypotenuse is 13m, base is 12m and the height is not given?

Physics
A rifle shoots a 4.1g bullet out of it's barrel. The bullet has a muzzle velocity of 975 m/s just as it leaves the barrel. Assuming a constant horizontal acceleration over a distance of 43.0 cm starting from rest, with no friction between the bullet and the barrel, what fo...

physics
How do I calculate the radial acceleration in g's? For example: Calculate the radial acceleration (in g’s) of an object on the ground at the earth's equator, turning with the planet. Earth's radius is 6380 km.

Physics
A 26.2 g marble sliding to the right at 62.0 cm/s overtakes and collides elastically with a 13.1 g marble moving in the same direction at 15.5 cm/s. After the collision, the 13.1 g marble moves to the right at 77.5 cm/s. Find the velocity of the 26.2 g marble after the collisi...

Math
30

Chemistry
Describe the creation of 234 mL of a 3.2 M sodium chloride solution

physics
You walk 51 m to the north, then turn 30° to your right and walk another 45 m. How far are you from where you originally started?

physics
I figured it out. 130N. I forgot about gravity.

physics
a woman weighs Fg=650 when standing on a stationary scale. The woman is riding an elevator from the 1st floor to the 10th floor. As the elevator approaches the 10th floor, it decreases its upward speed from 9 m/s to 1 m/s in a time interval of 1 second. What is the average for...

GEOMETRY
5√3/3 Can somebody evaluate this PLEASE!!!!!!

GEOMETRY
simplify 5√3/3

GEOMETRY
no i dont have a calculator thats why im asking what it is? can you please give me the answer. this is the last problem 2 my homework and i can't figure it out

GEOMETRY
i need it simplified to the nearest 10th

GEOMETRY
simplify 5 squareroot(3)/3

u.s history
Where did John Wilkes Booth shoot Abraham Lincoln?

u.s history
How did the Civil War end?

u.s history
How did the Civil War affect women?

health
Whats the largest bone in your body?

GEOMETRY
44411001444

GEOMETRY
parallelogram with a side of 40in a base of 36in and a height of 33in. WHAT IS THE AREA?

Math
A couple needs $15,000 as a down payment for a home. If they invest the $10,000 they have at 8% compounded quarterly, how long will it take for the money to grow into $15,000?

Calculus
Finf (dy/dx) y=(1+28x^3)f(x)+(6x)g(x)(x^4+5x+7)+(6x)g(x)(x^4+5x+7)-(e^x+7x^4)f(x)+3x^2g(x)(4x^3+5+7)/((x^4+5x+7)^2

physics
A test rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 49 m and acquired a velocity of What is the maximum hei...

troy
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 15.0° below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration o...

math
The owner of a service station receives a loan of $8,500 at 10.5% for 7 months. Find the amount of simple interest

Calc
Sqrt(xyz) I rewrote it has x^(1/2)*y^(1/2)+z^(1/2) And the derivative with respect to x is Sqrtyz/(2sqrtx) is that right

math
-x/y^2 = x/(1/y) is that a true statement?

choice
Varsity Press, a publisher of college textbooks, received a $70,000 promissory note at 12% ordinary interest for 60 days from one of its customers, Reader’s Choice Bookstores. After 20 days, Varsity Press discounted the note at the Grove Isle Bank at a discount rate of 1...

math
From 70 feet away from the base of a tree on level ground, the angle to the top of a tree is 60⁰. What is the height of the tree? What is the approximate distance from the vantage point to the top of the tree, to one decimal point? (Assume that the tree is perpendicular ...

Algebra
9 more than 2 times x

physics
if the * is the degrees, then you need to draw the vectors according to their direction. you can use a graph paper and make your own scale: say one unit cube is 10km/hr. then use the protractor to draw the vectors taking an horizontal line as zero degrees. then draw the vector...

Science
which of the following is an example of a mineral? silver, lava, fossils, sand, I say Lava

statistics
9,873.35

stats
suppose that a population of people is 1200. .25 of the population is white. we take a random sample of 100 people. What is the probabilit that more than .29 of these people are white?

U.S/history AP
King Cotton works for me

chemistry
A metal block of mass 11.5 g gives off 360 J of heat while cooling from 99.7 to 32.5 oC. What is the specific heat of the metal in J g-1 oC-1?

chemistry
A metal block of mass 11.5 g gives off 360 J of heat while cooling from 99.7 to 32.5 oC. What is the specific heat of the metal in J g-1 oC-1?

Science
Name 3 ways screws are used?

math
which fraction cannot be expressed as repeat decimal? a) 1/11 b)1/4 c 5/8 d 2/3

math
solve the equation: 3x-8=12

German
there is none. im trying to determine if that sentence is grammatically correct or incorrect.

German
Ich schminke mich lieber als er sich. is this incorrect or correct?

Cosmology
Comparison of emissions from elliptical galaxies in x-ray and optical bands

chemistry
Iwish to prepare 3% NH3 from 20ml strong NH4OH and 180ml H2O.Can you help me?

Chemistry
tyr-trp-phe-val-lie

Binomial Math
.2150

Math
Need help with 4th grade fractions.

Math
Jeramie has a jar of nickels and dimes. There are 200 coins worth $14.00. How many of each type of coin are in the jar. :)

economics
Mary earns $100/day at a flower shop. She will take 2 days off without pay to attend an out of town wedding. Transportation will cost $180 round trip. Hotel $99/day for 2 nights. What is the opprotunity cost?

geometry
angle xoz (5m-5) angle yoz (7m+29) these are supplementary angles. How do you solve?

Chemistry
What preperation produces a 2.0 Mole solution of C6H12O6? a) 90.0 grams of C6H12O6 dissolved in 500.0 mL of solution b) 180.0 grams of C6H12O6 dissolved in 1000mL of solution c) 90 Grams of C6H12O6 dissolved in 1000mL of solution D) 180.0 Grams of C6H12O6 dissolved in 500.0mL ...

English
yes it is C

The Age Of Jefferson To The American Expansion
18 is not D because i got it wrong when i answer the questions

Finance
questo

CHEMISTRY
What is oxygen extensive properties?

chemistry
Rate Constant * Concentration^2

Math
12 over 7 simplified

Math
-5 over 8 times -3

Math
10x and 45x to the power of 4

chemistry
Rate Constant * Concentration^2

chemistry
Rate Constant * Concentration^2

Chemistry
thanks

Chemistry
Rate Constant * Concentration^2

Chemistry
it is wrong

Chemistry
thanks

Chemistry
Thanks

Chemistry
thanks

Chemistry
thanks

Chemistry
thanks

Chemistry
thanks

social studys
fdf

Physics
What is the max speed a car can go on a race track with a radius of 80 meters, the coefficient of friction between the tires and the road is .30

Physics
A baseball (m = 135 g) approaches a bat horizontally at a speed of 40.4 m/s (90 mi/h) and is hit straight back at a speed of 45.7 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.00 ms, what is the average force exerted on the ball by the bat? Neglect the...

Statisitcs
The mean height of fully grown birch trees are 18 feet with a standard deviation of 1.2 feet, normally distributed. Random samples of size 9 are drawn from this population and the mean of each sample is determined. Find that mean and the standard error of the mean, and the sta...

Physics
An astronaut in his space suit and with a propulsion unit (empty of its gas propellant) strapped to his back has a mass of 146 kg. The astronaut begins a space walk at rest, with a completely filled propulsion unit. During the space walk, the unit ejects some gas with a veloci...

Physics
The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.4 m/s. If nonconservative forces, such as kinetic friction and air resistance, are negligible, what would be the height h of the highest point reached by the skateboarder on the ri...

physics
A hockey goalie is standing on ice. Another player fires a puck (m = 0.22 kg) at the goalie with a velocity of +63 m/s (a) If the goalie catches the puck with his glove in a time of 7.0 10-3 s, what is the average force (magnitude and direction) exerted on the goalie by the pu...

Physics
A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 26.0 m. She pushes in a direction 22.0° below the horizontal. A 38.0-N frictional force opposes the motion of the cart.

physics
The National Aeronautics and Space Administration (NASA) studies the physiological effects of large accelerations on astronauts. Some of these studies use a machine known as a centrifuge. This machine consists of a long arm, to one end of which is attached a chamber in which t...

Physics
On a banked race track, the smallest circular path on which cars can move has a radius of 115 m, while the largest has a radius 165 m, as the drawing illustrates. The height of the outer wall is 18 m.

7th grade science Ms. Sue pleae only 1 question
fdf

Physics
The drawing shows a circus clown who weighs 710 N. The coefficient of static friction between the clown's feet and the ground is 0.49. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force tha...

Physics
Well, hard to imagine the picture, but by the description the wires each side are at 16 deg. back on each side of the tooth, i.e. each at 16 deg. to the face of the tooth. Each has 18N. tension. (sin 16) x 18 = 4.9608N. Double it (2 wires), = 9.9216N. back on the tooth.

phyics
A train at a constant 44.0 km/h moves east for 42 min, then in a direction 45.0° east of due north for 17.0 min, and then west for 51.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of it...

Math
A room has dimensions 2.24 m (height) × 5.30 m × 6.55 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (b) If the fly walks rather than flies, what is the length of the shortes...

math (calculus)
A room has dimensions 2.24 m (height) × 5.30 m × 6.55 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (b) If the fly walks rather than flies, what is the length of the shortes...

Math
(2.0)t^2/2 = (9.5)t t=????

Physics
A train at a constant 44.0 km/h moves east for 42 min, then in a direction 45.0° east of due north for 17.0 min, and then west for 51.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of it...

physic
f(t)=ct

physics
A 5.9-kg rock and a 3.0 10-4-kg pebble are held near the surface of the earth. (a) Determine the magnitude of the gravitational force exerted on each by the earth.(b) Calculate the magnitude of the acceleration of each object when released.

Algebra,Geometry
You could actually set "X"=0 to find Y, and then plug in a "0" for Y to get X.

Math
Thank you!

Math
I think. I am honestly not sure what to do.

Math
The volleyball court -if it id 80 ft long and 50 ft wide, how would you find the dimensions of the court? Explain please! Remember that I am a 6th grader. Please don't give me a 10-12th grade answer.

grade 9 science
a student wants to estimate the population size and density of birch trees in a woodlot measuring 100 m by 100 m. On a diagram of the woodlot, she splits the area into a 10 by 10 grid and randomly selects 10 sample quadrants - (0,0), (1,4), (2,6), (3,9), (4,3), (5,5), (6,1), (...

d
the school auditorium has 8 rows of seats, divided in three rows. Each section has 15 seats. How many seats are there in total?

health
The lower thigh muscles are rectus femoris, vastus lateralis and medialis. Located in the back of your leg are the hamstrings. These muscles help you run, jump, and walk!

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