# Posts by Rachel

Total # Posts: 1,551

Math
I need help solving the problem below. Chris answered 19 out of 25 questions correctly on a math test. What percent of the questions did she answer correctly? Is the answer 76% 19/25= 0.76

Physics
The Equation of Continuity states that the mass flow rate has the same value at every position along a tube that has a single entry and a single exit point for fluid flow. Basically it boils down to the idea that the fluid doesn’t magically disappear or appear. If 2.0 kg ...

Physics
Thank you so much!

Physics

Physics
A metal block of mass 1.840 kg is hanging from a string. The tension in the string is 9.972 N. The block is submerged in a beaker of fluid and is stationary. What is the magnitude and direction of the buoyant force acting on the block? Consider making a free body diagram ...

pre algebra
the length of a rectangle is 6 cm more than its width. if 3 cm are taken from the length and added to the width, the figure becomes a square with an area of 64sq cm. what are the dimensions of the original figure.

stats
shipment of 30 computers, 8 are defective. Four computers are chosen at random. Find the probability that: a)Exactly two are defective b)None are defective c)At most two are defective

Science
Two pellets, each with a charge of 1.5 microcoulomb (1.5×10−6 C ), are located 2.8 cm (2.8×10−2 m ) apart. Part A Find the electric force between them.Part B What would be the mass of an object that would experience this same force in Earth's ...

Math troubles
Where did you get the .25 and .75 from?

Chemistry
how much solid KNO3 will crystallize and a saturated solution of KNO3;if the solution is cooled from 65 degrees Celsius to 45 degrees Celsius.

math
Find a formula for the inverse of the function. f(n)=4en3. f^[−1](Q)=

math
Find a formula for the inverse of the function f(x)=9−4/x2, x>0.

MATH.

algebra
How do I write-17-16 as a equivalent addition?

english
Does

physics
Late, I know, but b] W = -mgh, not mgh. Ran into this problem myself. :/

math
the units of a number is 4 more than the tens digit. If the digits are reversed the new number is 1 less than twice the original number. Use a system of equations and substitution to find the number. I'm stuck?!?!

Math
Mr. Sockem wears only black or navy blue socks, which are exactly alike except for their color. He has six pairs of each color, and he keeps them all mixed up in a drawer. One night, while the room was in complete darkness, he wanted to find a pair of matching socks. How many ...

Physics
A sign is hanging from three ropes. The tension in the lefthand rope, T1, is 460.80 N. Angle θ1=68.9°, and angle θ2=33.8°.What is the tension, T2, in the righthand rope? What is the mass of the sign?

Physics
Block A sits on a horizontal tabletop. There is friction between the surface and Block A. The string passes over a frictionless, massless pulley. Block B hangs down vertically. When the two blocks are released, Block B accelerates downward at a rate of 2.030 m/s2. Block A (...

Math
Your baseball team has won 6 games and lost 4 games.if the team doesn't lose any more games,how many games must the team win to have a win:lose ratio of 2:1

Social Studies
i forgot to say oil

Social Studies
How do the United States and Canada use their natural resources? What are the effects of the use of these resources?

math help
2x^4-3x^2-7x+1=0 Estimate what the real solution will be using Newton's method. Answers must be 4 decimal places. Let the first guess be x=1.75

Math Help
2x^4-3x^2-7x+1=0 Estimate what the real solution will be using Newton's method. Answers must be 4 decimal places. Let the first guess be x=1.75

Science(physics)
A spring 20cm long is stretched to 25cm by a load of 50N. What will be its length when stretched by 100N assuming that the elastic limit is not reached? I want the answer abd solving to this question and also the formula for young modulus of elasticity

Math
Is the middle point in the Cartesian Coordinate system correctly called the origin or the center? I am referring to the (0,0) point.

Math Literacy
I really don't know how to begin to approach this problem. A 6-year-old patient underwent an outpatient tonsillectomy and adenoidectomy The surgeon ordered 1,000 cc D5W, dispensed at a rate of 600 cc every 8 hours, to maintain hydration levels. A pharmacist calculated the ...

Physics 11
A skydiver [m=95kg] jumps out of an airplane and opens her parachute 45 seconds later. After another 15 seconds, the skydiver begins to descend gently at a constant speed of 7.8m/s. Draw a freebody diagram of the skydiver just after she's jumped out the airplane AND 1 ...

Pre-calculus/ trig
Given the vectors a= (-1,9) and b= (4,2) explain the difference between a-b and b-a. Thank you for your help! :)

Chemistry 12
The molar heat of vaporization of water is 42 kJ/mol. How much energy is released by the condensation of 3.0 g of water? So for water there will just be one mol. I think this is how you do it, but it doesn't match the answer in the worksheet. q=mc delta t But we're not...

geometry
find orthocenter triangle PQR .P(1,7)Q (1,2)R (11,2).

Science
1. We dissolve 0.005 mole of strontium chromate in 1 L of solution at 25°C. Will a precipitate be formed?

Algebra 1
Adam wants to create a square garden with a walkway on all four sides. The width of the walkway is 4 feet. Write a function to represent the area of the garden in terms of the length of one side of the walkway, x. ???

math
1+2

science
Four racecars are driving at constant speeds around a circular racetrack. The data table gives the speed of each car and each car’s distance from the center of the track at one instant. Car Speed (m/s) Position (m) A 40 20 B 40 25 C 50 20 D 50 25 Rank the cars’ ...

History
D? I know that Britain is the answer to the last blank.

History
Yes, is it c? :)

History
1.As a result of the French and Indian War, ___ claimed all land west of the Mississippi River, and ___ gained control of all land east of it. a. Indians; Britain b. Spain; France c. France; Indians d. Spain; Britain If you have any other answers to this test please help me on...

Chemistry
How many grams of oxygen gas must react to give 2.70 g of ZnO? 2Zn(s)+O2(g)→2ZnO(s) Express your answer with the appro

Thankyou!

my guess was {0,1,2,3,4,5,6,7,8,9,10,12,14,16,18,20} Is that correct, because I have no idea what v is suppose to mean.

suppose P equals {0,1,2,3,4,5,6,7,8,9} and V equals {2,4,6,8,10,12,14,16,18,20}. What is P (circle) V?

Physics
An electron has an initial speed of 4.00×106 m/s. What potential difference (sign and magnitude) is required to bring the electron to rest?

Social Studies
long island

College
Please,i need a chemical balanced equation between diethyl ether+ conc.sulphuric acid+ glacial acetic acid

English
Its from the story of the flood told by Utnapishtm

English
What does "lay upon sinner his sin" mean?

Chemistry
I have a lab question that is asking if the soda ash in our analysis was NaHCO3 instead of Na2CO3, how would the volume of acid added change from (a) the starting point to the phenolphthalein end point? (b) the phenolphthalein end point to the bromocresol green end point? (c) ...

Physics
A two-slit pattern is viewed on a screen 1.08 m from the slits. If the two fourth-order maxima are 52.8 cm apart, what is the total width of the central bright fringe?

AP Physics
A baseball player throwing the ball from the outfield usually allows it to take one bounce on the theory that the ball arrives sooner this way. Suppose that ball hits the ground at an angle θ and then bonuses but loses half of its speed. A. Assuming that the ball is ...

math
What is the z-score such that the area under the curve to the left is .48?

phyics
A car takes 11 s to go from v=0m/s to v = 22 m/s at constant acceleration. If you wish to find the distance traveled using the equation d=1/2at2, what value should you use for a? Please help on this i don't know what i should put i think m/s squared but i am not sure ...

Chemistry
Calculate the amount of heat required to raise the temperature of a 65-g sample of water from 32∘C to 65∘C. (The specific heat capacity of copper is 4.184 J/g∘C.) Express your answer in Joules.

phyics
A dart leaves the barrel of a blowgun at a speed v. The length of the blowgun barrel is L. Assume that the acceleration of the dart in the barrel is uniform. Find a time that the dart moves inside the barrel. Express your answer in terms of the variables L and v. If the dart&#...

phyics
Why does the distance traveled by the ball in each half second after it is released change in the way that it does? A.Gravity is pulling down on the ball, so it accelerates down at a steady rate. B.The incline plane pushes up on the ball, so it accelerates down at a steady ...

U.S history
Was Slavery the basis of freedom in colonial America? This what I hvae written I feel like its to much and would like to shorten it and make it sound more college level plz help. In colonial America slavery was the basis of freedom. In areas such as Europe and foreign ...

Physics
The magnitudes of the four displacement vectors shown in the drawing are A = 14.0 m, B = 11.0 m, C = 12.0 m, and D = 25.0 m. Determine the (a) magnitude and (b) direction for the resultant that occurs when these vectors are added together. Specify the direction as a positive (...

Algebra II
line passing through (0,3) that is perpendicular to x + y = 5 I thought it was y = -2x + 3 Answer is: y = x + 3 How did they get this? Thank you so much

phyics
Consulting the graph shown in (Figure 1) , determine the object's average velocity over the time interval from 2 to 4 seconds. Express your answer in meters per second to the nearest integer. Position versus time graph for an object traveling with a non-constant velocity. ...

phyics
Consulting the graph shown in (Figure 1) , determine the object's average velocity over the time interval from 2 to 4 seconds. Express your answer in meters per second to the nearest integer. Position versus time graph for an object traveling with a non-constant velocity. ...

Government
What is meant by “standards of justice have not always been met”? Provide examples of some efforts that have been made to reach the goals of justice at all?

physic
Suppose a runner completes one lap around a 400-m track in a time of 50 s. Calculate the average speed of the runner. please explain process

Physics
A very narrow beam of white light is incident at 56.10° onto the top surface of a rectangular block of flint glass 12.7 cm thick. The indices of refraction of the glass for red and violet light are 1.640 and 1.663, respectively. Calculate the dispersion angle (i.e., the ...

Physics
An object is placed 11.3 cm to the left of a diverging lens of focal length -6.51 cm. A converging lens of focal length 11.6 cm is placed a distance of d to the right of the diverging lens. Find the distance d that places the final image at infinity.

algebra
suppose 48 out of every 120 people like baseball. of the people who like baseball, 3 out of 5 play baseball. If you ask 500 people, how many would you expect to play baseball?

Physics
A light bulb is placed 19.6 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 5.50 cm closer to the mirror. Calculate the focal length of the concave mirror.

intermediat Algebra
2.2 miles

alGEBRA 1
thats wrong

alGEBRA 1
how many minutes in a year?

alGEBRA 1
simplify show all work: radical m^13

cnn student news world georgraphy
i know cant you search on the cnn website they are really short vedios?

cnn student news world georgraphy
yes i am i just finsihed watching the first one 8/20 vedio but i couldnnt find the part where it says shout out write the answer to today's shoutout? why is this significant?

cnn student news world georgraphy
yes i am i just finsihed watching the first one 8/20 vedio but i couldnnt find the part where it says shout out write the answer to today's shoutout? why is this significant?

cnn student news world georgraphy
i know but i need help /

cnn student news world georgraphy
because im don't have headphones and im in the er

cnn student news world georgraphy
i need someone to go on the cnn student news website and listen to the two vedios dated 8/20/15 abd 8/26/15 on the 8/20 write the answer to todays shout out" why is this significant? briefly describe the news stories from today:5 reflection write a 4-5 sentence summary ...

math
34-5^2 / 5 * 2^2

psychology
It is B

Algebra
Thank you Steve!

Algebra
Can you please help me solve: Fifteen less than twice some number is 115. 15 - 2x = 115 is this the correct equation? thank you

Word problems
A truck left midville at 2:00 p.m. for Carmine, traveling at 40 mil/hr. At 3:15 p.m. a car left Carmine for Midville at 55 mi/hr. The truck and car passed each other exactly 2 hours before the car reached Midville. How far is it from Midville to Carmine? Can someone please ...

Ss
what are the major interstates in ga? how would i get to brunswick island, ga from lawrenceville ga? how many interstates run through atlanta? what interstates would i or could i take from kennesaw ga to get to south carolina? what three major interstates run into alabama? ...

Math/Logic Puzzle
Can someone please help me? Charlotte and Amy are picking strawberries. If Charlotte picks 6 dozen dozen strawberries, and Amy picks a half-dozen dozen strawberries, which hedgehog will pick the larger crop of strawberries? How many did they pick? Thank you.

georgia state history
any ss tutor here who is good with ss georgia state history

Math
(8*2_10)_2*3 to the 7th power = 4374

cp biology
by helping me

cp biology
include the following vocabulary when completing the concept map. be sure to PLACE THE WORDS in the correct step of the scientific method, and DISCUSS what occurs at each step. words: qualitative data quantitative data independent variable data analysis/ interpretation law ...

math
for part a i got:d 1 20 b. how to solve and what to solve in order to get the answer

math
Paula always withdraws 20 dollars more than she needs from the bank. a. Write an expression for the amount of money Paula withdraws if she needs d dollars. b. Find the amount of money Paula withdraws if she needs 20, 60, and 75 dollars.

Math
Thank You

Math
ok can you pls tell me how to get the answer that will be great help to me.

Math
I did not post anything,yesterday. is the same questions was posted by anyone.

Math
It takes Kasey 1 2/3 hours to bike the Woodlawn Trail. It takes her 3 5/6 hours to bike the Hammerside Trail. How many times as long does it take Kasey to bike the Hammerside Trail than the Woodlawn Trail ? A. 2 1/6 B. 2 3/10 C. 2 1/3 D. 5 1/2 How to solve this help me

Chemistry H
"When you pulled the steel wool apart, you found that the mass was unchanged. When you heated the steel wool, you found that the mass changed. Explain."

Chemistry
"When you pulled the steel wool apart, you found that the mass was unchanged. When you heated the steel wool, you found that the mass changed. Explain."

Math
A recipe requires 3/4 cup of nuts for 1 batch of muffins. How many batches of muffins can be made using 7 1/2 cups of nuts?

Physics
A model rocket is fired vertically from the ground with a constant acceleration of 44.3 m/s2 for 1.95 s at which time its fuel is exhausted. What is the maximum height (in m) reached by the rocket? Shouldn't this just be d=rt? 44.3(1.95), but I'm not getting the right ...

Physics
Olympic diver Matthew Mitcham springs upward from a diving board that is 3.00 m above the water. He enters the water at a 79.0 degree angle with respect to the water surface, at a speed of 9.01 m/s. Determine the magnitude of his initial velocity. Determine the direction of ...

Algebra 1
You are planning a rectangular patio with length that is 7 ft less than three times its width. The area of the patio is 120 ft^2. What are the dimensions of the patio? I just need to figure out what equation to write from this. I'm thinking something along the lines of 3x^...

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