Sunday
April 20, 2014

Posts by Christina


Total # Posts: 832

Stats
Find the P-value for a left tailed hypothesis test with a test statistic of z= -1.77. Decide wether to reject the null if the level of significance is alpha= 0.05. Please help I've tried everything and I can't figure out how to get the right answer..

Hanus
points Q (10,8) and R (24,10) are the endpoints of a diameter of a circle centered at P. Line l is tangent to the circle at S (12,14). What is the y-intercept of line l?

Statistics
In a survey of 621 males ages 18-64 , 396 say they have gone to the dentist in the past year. Construct 90% and 95% confidence intervals for the proportion. Interpret the results and compare the widths of the confidence intervals. Please show step by step. Thank you!

Physics
You are given a four-wheeled cart of mass 11 kg, where the distance between a wheel and its nearest neighbors is 2.1 m. Suppose we load this cart with a crate of mass 109 kg, where the crate's center of mass is located in the back-middle of the cart, 0.525 m from its cente...

Physics
Suppose we take a 1 m long uniform bar and support it at the 27 cm mark. Hanging a 0.31 kg mass on the short end of the beam results in the system being in balance. Find the mass of the beam.

Spanish2
Está prohibido fumar. (Write advertisements or signs for the situations described. Use impersonal constructions with se.)

pre-calculus
Find the real and imaginary zeros for the following polynomial function. T(b)= 147b^3-35b^2-19b+3

RE: Physics
If an incline has a difference in height from one end to the other of 17.8 cm and has a length along the incline of 1.19 m, what is the angle that the incline makes with the horizontal reference surface? Physics - Damon, Saturday, February 15, 2014 at 5:20pm cos (angle) = .178...

Physics
So the answer is 81.4? My online homework says that it is wrong?

Physics
If an incline has a difference in height from one end to the other of 17.8 cm and has a length along the incline of 1.19 m, what is the angle that the incline makes with the horizontal reference surface?

Chem
what mass of hydrogen was in an unknown compound containing only c, h, and o if 2.65kg H2O was produced by combustion analysis

US History
gogle it it comes up on yaho answers. I would probably go with A too.

US History
The train I believe.

physics
In the circuit shown, find the voltage Vx (in Volts) if V = 17.0 Volts, R1 = 13.0 k ohms, R2 = 4.0 k ohms, R3 = 13.0 k ohms and R4 = 21.0 k ohms. Answer is -6.5 I don't understand how they got it, can someone please explain it with steps? Thanks tinypic. c o m/r/2pzhcpl/8

Physics
In the circuit shown, find the voltage Vx (in Volts) if V = 17.0 Volts, R1 = 13.0 k ohms, R2 = 4.0 k ohms, R3 = 13.0 k ohms and R4 = 21.0 k ohms. Answer is -6.5 I don't understand how they got it, can someone please explain it with steps? Thanks tinypic. c o m/r/2pzhcpl/8

Physics
If the resistances R1= 16. ohms, R2 = 38. ohms, and R3 = 18. ohms, and the voltage V = 6.0 volts, what is the current ix (in Amperes) in the circuit. tinypic .cm /r / nfr48k/ 8 The correct answer is .1443 but I want to know how they got that. Thanks.

science
You measure the dimensions of a rectangular block of aluminum to determine its volume. It has the following dimensions. length = 10.27 cm; width = 4.92 cm; height = 1.53 cm Assuming that each of these measurements is accurate to the nearest 0.01 cm, find the volume of the bloc...

Science
The sensitivity of a measuring instrument is the value of the smallest quantity that can be read or estimated with it. What is the smallest part of a centimeter that can be read with the following? (a) a meterstick with markings at each millimeter I tried .01 mm .05 mm .1 mm ....

Physics
A test rocket is launched by accelerating it along a 200.0-m incline at 1.25m/s2 starting from rest at point A (the figure (Figure 1) .) The incline rises at 35.0 ∘ above the horizontal, and at the instant the rocket leaves it, its engines turn off and it is subject only...

Physics
A test rocket is launched by accelerating it along a 200.0-m incline at 1.25m/s2 starting from rest at point A (the figure (Figure 1) .) The incline rises at 35.0 ∘ above the horizontal, and at the instant the rocket leaves it, its engines turn off and it is subject only...

Calculus
Consider the solid obtained by rotating the region bounded by the following curves about the line x=1. y=x,y=0,x=4,x=6 Find the volume So it would be pi (integral from 3 to 6) of ((1-y)^2 -(1-0)^2) right? so then you integrate it and get pi(Y^3/3-y^2) from 3 to 6. ?

Physics
A 0.5 kg wooden block is dropped from a height of 15 m. At what height must a 5g bullet be traveling upward strike the block in order to momentarily stop its fall? Assume that the time required for the bullet to come to rest in the block in negligibly short, that no internal e...

Physics
An explorer in the dense jungles of equatorial Africa leaves his hut. He takes 41 steps at an angle 45∘ north of east, then 81 steps at an angle 60∘ north of west, then 49 steps due south. Assume his steps all have equal length. Save him from becoming hopelessly lo...

science/math
A car traveling at the speed of 30.0 m/sec encounters an emergency and comes to a complete stop. how much time will it take for the car to stop if its rate of deceleration is -4.0 m/sec

social studies
What was the reason for Baltimore's successful shipyards?

Social Studies
1. Diversity most closely means (1 point) sharing cultural traits and practices with others. making up a whole of many different parts. being a member of a small ethnic group. having many similar regions next to one another. 2. How does life in Istanbul differ from life in rur...

Calculus
The area A of the region S that lies under the graph of the continuous function is the limit of the sum of the areas of approximating rectangles. A = lim n → ∞ [f(x1)Δx + f(x2)Δx + . . . + f(xn)Δx] Use this definition to find an expression for the ar...

Physics
A boat is being towed through a canal by means of ropes which make a 45 degree angle to each other. If a force of 75N is applied to the rope, what is the resultant force pulling the boat forward?

math
My online homework says it is wrong. I tried it without the negative sign too

math
Two sides of a triangle have lengths 8 m and 24 m. The angle between them is increasing at a rate of 0.05 rad/s. Find the rate at which the area of the triangle is changing when the angle between the sides of fixed length is 135°. Round your answer to two decimal places. S...

math
Two sides of a triangle have lengths 15 m and 18 m. The angle between them is decreasing at a rate of 0.08 rad/s. Find the rate at which the area of the triangle is changing when the angle between the sides of fixed length is 120°.

chemistry
A lab tech had accidentally set out 16M HCl for this experiment. How much ( in mL) 16M HCl is needed to make 450mL of a 3M HCl solution?

chemistry
please help!

chemistry
write the balanced equation for the reactions of aquesous pb(CIO3)2 with aqueous Nal. include phases. 2.If a solution containing 86.044 g of mercury(II) chlorate is allowed to react completely cointaing 15.4888 g of sodium sulfide, how many grams of solid precipate will be for...

MATH ASAP
Eliminate the parameter to find a cartesian equation x= 1-t^2 y=t-2 -2 _<t _<2 known: -4 <(or=) y <(or =) 0 I got y= sq(x-1)+2

math ASAP
Find the point of intersection L1: r(t)= (-5 + 3t)i + (1+t)j L2= r(s) = (1+2s)i + (5-6s)j I know they are perpendicular, and the system of equations I think is t= 4/5 s =8/5 so how do I find the point of intersection

math
THANK YOU SO MUCH!

math
Find, correct to the nearest degree, the three angles of the triangle with the given vertices.? A(2, 0),B(4, 5), C(-3,2) ANGLE- CAB ANGLE- ABC ANGLE- BCA In degrees. I got the vectors AB <,5> BC <1,3> AC <-1,2> and I know the equation b.c= |b| |c| cos t

math
The temperature in the evening was 68 degrees fahrenheit. The following morning, the temperature was 39 degrees fahrenheit. What is the difference between the two temperatures?

conceptual physics
How do you calculate the time a boat has traveled at 25 knots

Conceptual Physics
How do you calculate the time traveled while traveling 25 knots? It needs to be converted into km/hr.

Math
A standard deck of cards has four different suits:hearts ,diamonds ,spades, and clubs.Each suit has 13 cards, making a total of 52.Two cards are drawn without replacement. What is the probability of drawing first a heart, and then a spade?

Math
A computer printer can print 3 pages in 25 seconds . Which proportion can be used to find x,the time it will take the printer to print 10 pages?

AP Chemistry
CH3NH2(aq)+H2O(l)=>CH3NH3+(aq)+OH-(aq) Kb=4.4 x 10^-4 Methylamine, CH3NH2, is a weak base that reacts with water according to the equation above. A student obtains a 50.0 mL sample of a methylamine solution and determines the pH of the solution to be 11.77. (a) Write the ex...

Chemistry
If 20 grams of sulfur reacts with an excess of oxygen, what volume of the product SO2 would be collected at 108.5 kPa and 15 degrees Celseius?

business
ok ive got pretty much my whole test done but am stuck on this one question Regarding management and leadership, Which statement is most accurate? A. leaders can be good managers,and good managers can be good leaders. B. leaders arent managers and managers arent leaders. C.lea...

chemistry
a) Kb=[CH3NH3][OH-]/[CH3NH2][H20] b) -log[H+]=pH=11.77 pH+pOH=14.00 14.00-11.77=2.23=pOH [OH-]=10^-pOH=10^(-2.23)=.0058M

Chemistry
A sealed flask contains 1 mole of hydrogen and 3 moles of helium gas at 20DC. If the total pressure is 40kPa, what is the partial pressure of the Hydrogen gas? AND :) The data below was obtained by a student in order to determine the percent of water in a Hydrate: Mass of the ...

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.

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.

Physics!
The steel I-beam in the drawing has a weight of 9.03 × 103 N and is being lifted at a constant velocity. What is the tension in each cable attached to its ends? With both angles being 70 degrees

Physics!
At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 860 m/s2 and the vertical or y component of its acceleration is 930 m/s2. The ball's mass is 0.38 kg. What is the magnitud...

Chemistry
At a given Temperature, the elementary reaction A<--->B in the forward direction is first order in A with a rate constant of 3.90*10^-2s^-1. The reverse reaction is first order in B and the rate constant is 8.20*10^-2s^-1. What is the value at equillibrium for the reacti...

stats.
z=(1.25-1.35)/(0.25sqrt40)= -0.0791 z=(1.50-1.35)/(0325sqrt40)= 0.0791 but not sure how to read the z scores I dont know if it would be.5000-.5000 or what can someone please help me on the z scores for -0.0791 and 0.0791

stats.
The mean number of bumped airline passengers per day is 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 of bumped passengers for the 40 days will be between 1.25 and 1.50?

stats.
so would part a be .4207=(x-550)/100 ?

stats.
The GMAT test is required for admission to most graduate programs in business. In a recent year, the GMAT test scores were normally distributed with a mean of 550 and standard deviation of 100. A. Find the first quartile for the distribution of GMAT scores. B. Find the median ...

stats.
The mean number of bumped airline passengers per day is 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 of bumped passengers for the 40 days will be between 1.25 and 1.50?

Stats.
Thank you so much

Stats.
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. ...

Physics....PLEASE HELP
A motorcycle has a constant acceleration of 2.13 m/s2. Both the velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a) 24.0 to 34.0 m/s, and (b) 54.0 to 64.0 m/s

physics
A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 91.9 m/s2 for 1.53 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) wi...

Math
If there are 51 students on a bus and 2/3 got off how many students got off the bus

Math
If there are 51 students on a bus and 2/3 got off how many students got off the bus

math
What weighs less 4.09 kilogram or 4.196 kilogram.

Physics
the world may never know.

Pre-AP Science
an atom consists of 10 neutrons ,10 electrons,and 9 protons. The atom has gained an electron resulting in a charge of -1. What is its mass number?

math
hi i dont know the answer please help me

math
hi i dont know the answer please help me

julius caesar
The Roman crown will appear several times in the play. What is your impression of them in this scene? Cant figure this one help!!!!!!!

julius caesar
what does the atmophere and the political situation reveal in act one scene 1

Math2
A bacteria culture had a population of 10 million at 10:00 A.M., and by 2:00 P.M. had grown to 14 million. (a) Predict the population at 6:00 P.M. that same day. (Round your answer to one decimal place.) (b) When will the population double in size? (Round your answer to the ne...

Math
The 1989 World Series San Francisco quake was initially reported to have magnitude 7.0, but later this was revised to 7.1. How much energy released corresponds to this increase in magnitude? (Round your answer to two decimal places.)

math
could it be h<48 cuz thats one of the answer choices

math
in order to be able to ride a roller coaster you must be 48 inches tall .which inequality represents this situation?

math
I need to solve this problem. A teacher can grade 25 papers in 4 hours. How many papers can he grade in 6 hours?

alg/trig
9/x + 9/x-2= 12

math final review (help)
from a 12cm by 12cm piece of cardboard, square corners are cut out so that the sides can be folded up to make a box. Express the volume of the box as a function of the length, x, in centimeters.

Applied Business Law
The first party who is to file the statement has the priority to the collateral. The person signing over the papers and giving the bank permission to take the collateral has every right to calm the property that was disclosed in the financing statement. Agile borrowed five hun...

ALGEBRA 2 urgent!!
if you have 200 feet of fencing to enclose four adjacent rectangular enclosures. Determine what demensions should be used so that the enclosed area will be maximized.

Physics
Here's the question: A 55 kg swimmer is standing on a stationary 235 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +4.3 m/s relative to the shore. Find the recoil velocity that the raft would have if there were no friction and resista...

Physics
The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. As she fires a gun, she is driven back over the edge and into the sea. Suppose the mass of a bullet is 0.009 kg, and its velocity is +735 m/s. Her mass (including the gu...

Math
single large rectangle steve

Math
if you have 200 feet of fencing to enclose four adjacent rectangular enclosures. Determine what demensions should be used so that the enclosed area will be maximized.

chemistry
How many moles of glucose would be present in: 1Litre of a 5micromolar solution?

chemistry
Does molecular weight of water (H2O) = atomic weight of 2H + O = 2(1.008) + 15.999 = 18.015g ~ 18.02g (4. sig. fig.) is it correct?

chemistry
1.To make the following saline solution (375ml 0.5% w/v sodium chloride). I have weighed 1.875g of NaCl. What will be the volume of water that is required?

math
there were 360 pumpkins in a pumpkin patch , but it was difficult for farmer alexander to find the perfect pumpkin. evry third pumpkin was too small. every fourth pumpkin was too green. every fifth pumpkin had a broken stem. every sixth pumpkin had the wrong shape. How many pe...

math
700

math
Is the correct answer 1400.

math
At Strawberry State College, the ratio of females to males is 2:1. If there are 2100 students, how many are female and how many are male?

math
On a TV game show, a contestant makes $800 for every correct answer but loses $500 for every wrong answer. After answering 26 questions, Sarah broke even. How many questions did she answer correctly?

physics
what is acceleration of an object over a 4second period if its starting velocity is 8 m/s and it velocity is 20 m/s?

chemistry
I would like to know what volume of water you use? How to calculate the volume of water?

chemistry
2. Sulfuric acid comes from the oxidation of sulfur. The stages of the reactions are given below: S + O2 --> SO2 ∆H= -296.8 kj SO2 + 1/2 O2 --> SO3 ∆H= -98.9 kj SO3 + H2O --> H2SO4 ∆H= -130.0 kj The typical plant produces 750 tons of H2SO4 per day. C...

Chemistry
Each of 2 front tires in the car is filled with a different gas. One tire contains 116 g of helium, another tire has 160 g of unknown gas. How many times heavier is a molecule of the unknown gas than an atom of helium?

geography
john who lives at 35 degrees north and 120 degrees west regularly calls Geroge his business partnet at 2pm (John's local time) every day during July last year. George regularly recevied the calls at 10 pm ( his local time). throughout the month, George reported that the ma...

math
If you are flying to a city 800 miles away, what will be the difference in flight times between flying into a 40-mph headwind and flying with a 40-mph tailwind if the plane's maximum speed with no wind is 160 mph?

math
Jacob opens a savings account on January 1 with a deposit of $350. He has "direct deposit," in which $25 is deposited every other week. The bank also charges a $3 monthly processing fee. How much money will he have at the end of the year?

math
-16343-x=-343 Find x

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