Posts by Elizabeth

Total # Posts: 1,075

math
Stephanie is a very good soccer player. She can kick a soccer ball with an initial velocity of 21.3m/sec. The function that represents the height of the ball with respect to time is h(x) = -4.9x^2 + 21.3x. About how many seconds will it take for the ball to hit the ground.

Chemistry
Describe what happens to kinetic energy of the molecules when temperature increases. What type of relationship between exists between kinetic energy and temperature? (direct or inverse)

Math
Thanks!

Math
Thank you so much! I was debating whether or not I should use a graphing calculator for this problem. Is there a way I can determine if the graph touches or crosses at the x-axis without the calculator in this case?

Math
Hi! I was wondering if you guys could offer me help on the following problem. I am supposed to find the x-intercepts of this problem, but all of my attempts have failed. I have tried factoring it ,and I tried the Rational Zero Theorem. Thanks for your help! 2x^4-7x^3+11x-4=0

English
Hi I wrote about my routines.. I would like to know what do you think. Thanks My name is Liz. I am a teacher. I always wake up at 7 o’clock in the morning then I wash my face and brush my teeth. After that, I go out for a walk with my dog in the open field. Then I return ...

English
In this exercise Use the word given in capital to some word that fits in the gap in the same line. DECISION - When I first met Steve, our senior manager, he seemed to me rather impatient and somewhat (indecisive) especially when it was necessary to take some serious decisions ...

ESSAY
Dear Writeacher, I wrote again, thanks for your advise. Nowadays, traveling is the kind of activity, which almost all the people love. For some people, it is an opportunity to relax and abstract from everyday busy life and also it is interesting to learn about other cultures, ...

ESSAY
Dear Writeacher, ESSAY is about what does traveling make you? what does traveling teach you? thanks

ESSAY
I wrote this essay, i would like to know if is Ok. Thanks Nowadays, Travelling is the kind of activity, which almost all the people love. For some people it is an opportunity to relax and abstract from everyday busy life. For others it is interesting to learn about other ...

English
Writeacher I don't understand thanks

Easy Math
Find functions f and g so that f o g = H. H(x)=1/(x^2-5)

Simple Science
Yes, but I could not find any helpful results. :)

Simple Science
In science, what is the meaning of the phrase "respective implication"?

Simple Science
Thank you so much!!

Simple Science
Are there independent and dependent variables in observational studies?

Math-Trigonometry
Can someone help me with this problem. -A Ferris wheel has a radius of 37.8 feet. The bottom of the Ferris wheel sits 0.7 feet above the ground. You board the Ferris wheel at the 6 o'clock position and rotate counter-clockwise. A)Define a function, f that gives your height...

Science, Physics
Assume you are speeding down the freeway at 75 mph. The car weighs 1500 kg and the effective force of the brakes is 14400 N. The car in front of you suddenly slows down, it takes 3 seconds for the car to do so. Your initial velocity was 33.53 and your final velocity is 0. If ...

math
The store employee works 35 hours per week. Which inequality can be used to find the dollar value, x, of weekly sales that the employee must make to earn more than $400 per week?

Math
When drawing box and whisker plots, how do you know when you no longer need to draw the whiskers? For instance, in the following data points: 3,42,45,55,56,58,and 84, you do not need whiskers. However, in the data points: 12,35,37,41,53,58,59,91, you do need whiskers. Thanks!

math
No it stays -8

Pre calc
A water tower is located x = 375 ft from a building (see the figure). From a window in the building, an observer notes that the angle of elevation to the top of the tower is 39° and that the angle of depression to the bottom of the tower is 25°. How tall is the tower...

Writing
Please Help me !! Sentence 9: They emphasized the importance of good maternal and child health care, including the administering of vaccines? 1- replace They with it 2- change emphasized to emphasize 3- change the spelling of importance to importants 4- insert a comma after ...

Writing
I Think 3

Writing
Sentence 6: Just choosing among handsaws circular saws jigsaws and saver saws can be bewildering. 1- handsaws circular saws jigsaws and saver saws 2- handsaws circular saws jigsaws, and saber saws. 3- handsaws, circular saws, jigsaws, and saber saws. 4- handsaws, circular saws...

Science
A car is traveling at 8.9 m/s (20mph) in a school zone. A child darts in front of the car. Ignoring reaction time, the car can accelerate (brake) at -4.57 m/s. -How long will it take for the car to stop? -How far will the car travel in that time?

Chemistry
Consider a 1.0 L container of Neon gas at STP. Will the average kinetic energy, average velocity,and frequency of the collisions of gas molecules with the walls of the container increase, decrease, or remain the same under each of the following conditions? a. The temperature ...

Algebra I
3 bags of chips and 5 bottles of water cost $31. A chip costs one dollar less than 3 bottles of water. Find the cost of each.

Physical sciences
Science

Calculus
Differentiate each 1. Y= 1/x + 3/x^2 + 2/x^3 2. Y= x^5(1+ x)^5 3. Y= 4-x^2 / 2x+3 Can someone help me I'm lost

Calculus
A point moves along the curve y= x^3 -3x + 5 so that x= 1/2 square root t + 3 where t is the time. At what rate is y changing when t = 4? Need some help!!!

Math-Ratios
In a college library, there are 4 times as many nonfiction books as fiction books. A.Find the ratio of the number of nonfiction books to the number of fiction books. B.How many times the number of nonfiction books is the number of fiction books? C.Suppose the fiction books is ...

Math
Victoria has a 2-pound package of flour. She uses 2/5 of the flour to make bread. Find the weight of the package of flour that she has left. Express your answer as a decimal.

Math
Why is 25 a composite number help!!

Math help please
solve the equation. then you say what does x mean the answer is Solution 1 Subtract 77 from both sides 5x=10-75x=10?7 2 Simplify 10-710?7 to 33 5x=35x=3 3 Divide both sides by 55 x=\frac{3}{5}x= ?5 ? ?3 ?? Done Decimal Form: 0.6

math
Shopping: Tax Situation: You are purchasing four items and want to calculate the tax. The items cost $2.50, $8.75, $3.00, and $10.25. The tax rate is 6%. How much is the tax? Calculation With Distribution (Show all steps.) Calculation Without Distribution (Show all steps.) I ...

Math shopping discounts
is it easeir to use distributive property or nah?

Math shopping discounts
Situation: You want to buy three books that are on sale at 20% off. The original prices of the books are $2.50, $4.95, and $6.00. How much will you save? Calculation With Distribution

math
thx for the help damon, and yea I meant at most 35 people. What grade are you in?

math
Solve each inequality 1. m-7<6= 2. n-8>5= 3. p+5<10= 4. there are 20 students and unknown number of adults, the bus can hold at least 35 people. What is the greatest number of adults who can chaperon?

history
Articles of Confederation, 1777–1781. The Articles of Confederation served as the written document that established the functions of the national government of the United States after it declared independence from Great Britain.

Literacy
it would be number one moses is from the bible and tubman is represnted as moses so number one would be the correct answer.

geography
Jews were originally expelled from their homeland by the: A. Palestinians B. Romans C. French D. British I think that it's B, but I'm not sure. Thanks!

Social Studies
Which of the following is most closely associated with the idea of nullification? A.States' rights B.Tariffs** C.Foreign policy D.Suffrage

Algebra
A team won 6 out 8 games played this season? What percent of games did they win? 6 divided by 8= 0.75, but 75% is the wrong answer. What is the correct answer?

Algebra
A team won 6 out 8 games played this season? What percent of games did they win? 6 divided by 8= 0.75, but 75% is the wrong answer. What is the correct answer?

geog
What kind of physical processes that formed the Alps? Thanks!

Science
A gene is to a chromosome as _______. a) a pea is to as a pod b) a front is to a back c) a bike is to a car d) a building is to a window I think it is a.

Chemistry
Good Morning DrBob222, My answer is all of 1,2,and 3. Please let me know if I am on the right track. 2) 2na=2na+2e (oxidation) Cl2+2e-=2Cl- (reduction) 3) 2Mg=Mg2+ +4e (oxidation) O2+4e-=2O2 (oxidation)

Physics
Damon awesome explanation. Thank you! :)

Physics
When an object is moving in a circle, but it is not held to the center by a tangible connection like a string, what provides the centripetal force? 1) some force such as friction or gravity. 2) the tendency for the object to move in a straight line. 3) centrifugal force. 4) ...

physics
When an object is moving in a circle, but it is not held to the center by a tangible connection like a string, what provides the centripetal force? 1) some force such as friction or gravity. 2) the tendency for the object to move in a straight line. 3) centrifugal force. 4) ...

american Government
Yes, the answer is b. Ms Sue isnt wrong, it does not even seem you thought about the question before choosing an answer, although it could have been brought up more considerably. Please put more thought into your choices, answers should not be given.

chemistry
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 11.07 % naphthalene by mass. Calculate the vapor pressure at 25 ∘C of hexane above the solution. The vapor pressure of pure hexane at 25 ∘C is 151 torr.

Algebra one
What is the compatible number of 19% of 30

Science
c

Algebra
1)More than 450 students went on a field trip. Ten buses were filled and 5 more students traveled in a car. a) Write an inequality to represent the situation. Be sure to define your variable. b) Solve the inequality to find the minimum number of people on each bus. b=# of ...

Math
Jason received an invoice for $5,000, and the invoice was dated on August 26 with terms of 2/10, n/45 EOM. Please answer the following questions: (1) How much did Jason owe if the bill is paid by September 26? (2) When will be the last day that Jason can receive the cash ...

Math
Explain how you know if a number can be divided by 10 evenly

Math
Eight increased by the product of 2 and two less than a number

Physics
Oh....I get it now! Thanks for your help! This has helped me understand many topics in Physics that we have covered this year! Thank you so much! You have no idea how much relief your help has brought me!

Physics
I think this is a two part question, but I don't understand what I am supposed to be solving for:( Do I frist solve for the distance from 0 - 8 seconds and then 9-12 seconds?

Physics
A car uniformly accelerates from rest at 3 m/s^2 for 8 seconds. At the end of the 8 seconds the car uniformly brakes at -5m/s^2 for 4 seconds. What total distance is traveled by the car during the 12 seconds of motion?

Physics
So, can speed be negative, or is velocity only negative?

Physics
Is the initial speed of the ball 0 m/s and the final speed 0 m/s?

Physics
A child throws a small ball vertically upwards. The ball is caught at the initial height 1.8 seconds after being thrown. What was the net displacement for the ball? What was the initial speed of the ball? What was the final speed of the ball? How high did it rise?

Physics
Thanks!

Physics
Do you mind if I verify a couple more questions? My physics background is not very strong:(

Physics
Oh...So it pauses for a second and then falls to the ground!

Physics
I get it now! I was confused about the final velocity. So, is the final velocity 0 m/s because that is when it hit the ground?

Physics
A ball is thrown straight up at an initial speed of 24 m/s. How long did it take to reach maximum height? How high did it rise before falling again? I am confused on how to attempt this problem. Please provide me with some guidance:)

Physics
(a) Find the electric field at x = 5.00 cm in Figure 18.52(a), given that q = 1.00X10^-6;C . (b) At what position between 3.00 and 8.00 cm is the total electric field the same as that for –2q alone? (c) Can the electric field be zero anywhere between 0.00 and 8.00 cm? (d...

Physics
(a) A narrow beam of light containing yellow (580 nm) and green (550 nm) wavelengths goes from polystyrene to air, striking the surface at a 30.0º incident angle. What is the angle between the colors when they emerge? (b) How far would they have to travel to be separated ...

Physics
At what positions is the speed of a simple harmonic oscillator half its maximum? That is, what values of x / X give v = ±vmax/2 , where X is the amplitude of the motion? Hello, I am so confused about this question. I am not really sure where to start. Thank you so much!

Physics
Your ear is capable of differentiating sounds that arrive at the ear just 1.00 ms apart. What is the minimum distance between two speakers that produce sounds that arrive at noticeably different times on a day when the speed of sound is 340 m/s?

math
Suppose you have a wallet with $5 bills, $10 bills, and $20 bills. If the probability of picking a $20 bill is 4/15, and the probability of piciing a $5 bill is 1/3, what is the probability of picking a $20 bill? a. 1/15 b. 1/5 c. 4/15 d. 2/5 **

math
Dina and Masha start out on a bike path 10 km long at the same time. When Dina reaches the end of the 10 km, Masha still has 2 km left to bike. If Dina’s biking speed is 5 km/h, find Masha’s biking speed.

Math
Write twenty million, five hundred ten thousand in expanded notation using exponents.

life orientation
Sexual abuse

Chemistry
I have a .01 M solution of N2, and the concentration of H2 in the same solution is .02. What is the Ksp.

math
A set of data items is normally distributed with a mean of 70. Convert the data item to a z-score, if the standard deviation is as given. data item: 80; standard deviation: 15

Math
suppose you have two prisms with the same volume. one is shaped like a cube and the other is "longer." which has the lesser surface area?

Math
Who were John Venns peers or any mathematicians working on the same thing as John during the same time as him?

Health
The reason no one could answer the question is because you didn't give the answer choices :) But i think that they would start coughing and would have a shortness of breath.

life orientation
Sexual abuse and violence against women

Math
X is a normally distributed random variable with a mean of 8.00. If the probability that X is less than 9.54 is 0.67, then what is the standard deviation of X?

Chemistry
A sample of 0, 3220g of an ionic compound containing bromide ions (Br-) is dissolved in water and treated with excess of AgNO3. If the mass of the precipitate of AgBr formed is 0, 6964g, answer: a) what percentage of bromine in molar mass? b) Give the mass of bromine in the ...

Chemistry
A sample of 0, 3220g of an ionic compound containing bromide ions (Br-) is dissolved in water and treated with excess of AgNO3. If the mass of the precipitate of AgBr formed is 0, 6964g, answer: a) what percentage of bromine in molar mass? b) Give the mass of bromine in the ...

Chemistry
Thanks @DrBob222

Chemistry
Show how you would calculate the % yield of hydrogen if 40.0 grams of magnesium react with an excess of nitric acid producing 1.70 grams of hydrogen gas. Mg + 2 HNO3 ---> Mg(NO3)2 + H2

Chemistry
The network parameter of molybdenum 0.314 Valley nm and its density to 20° C 10.22 Valley g/cm3. Determine the crystalline structure of the molybdenum

Simple Geography
Thank you so much!!

Simple Geography
The provisions of the United Nations Conference of the Law of the Sea (UNCLOS) give coastal countries navigational and economic sovereignty over which of the following zones? A) 200-nautical-mile exclusive economic zone B) Export processing zone (EPZ) C) continental shelf D) ...

Geography
Thanks so much!!!!

Geography
I have a question regarding the answer. Is it geographical area because you can't adjust the population size?

Geography
Thank you so much!! You have no idea how much I appreciate your help!

Simple Geography
Is geographical area correct? Please help!

Geography
Whereas reapportionment adjusts the amount of political representation give to a certain geographical area, redistricting adjusts A) country, state and/or county boundaries. B) population size. C) the gerrymander. D) Federal lands. E) the geographical area. I think the answer ...

Chemistry
A rigid cylinder with a moveable piston contains 50.0 liters of a gas at 30c with a pressure at 1.00atm

math
A physics test has twenty questions worth 100 points. The test consists of true /false questions worth 3 points each and multiple choice questions worth 11 points each. How many multiple choice questions are on the test ?

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