Saturday
October 1, 2016

Posts by RAchel

Total # Posts: 1,488

Math
Jim has $87. He spends $6 for socks and at least $32 for shoes. How much does he have left to spend on shirts? I know the answer is >49 I need to find the inequality equation. Thank you
September 27, 2016

Chemistry
PLEASE HELP OR I WILL FAIL What would be the final temperature of the system if 16.6 g of lead at 138 ◦C is dropped into 23.4 g of water at 8.68 ◦C in an insulated container? The specific heat of lead is 0.128J/g◦C.
September 22, 2016

AP Chemistry
(DrBob222 please help me) A sample of 1.97 grams of Z is dissolved into 500 grams of water which is in a styrofoam coffee cup. The temperature is monitored and is found to rise from 25.015◦C to 25.484◦C. What is ∆Hsolution for substance Z? Assume no heat is ...
September 22, 2016

PRE-CAL
ok this worked out great! thank you!
September 17, 2016

PRE-CAL
the table is just that r 2% 4% 6% 8% 10% 12% t ? ? ? ? ? ? i will try that out then Thank you
September 17, 2016

PRE-CAL
Complete the table for the time t (in years) necessary for P dollars to triple when interest is compounded continuously at rate r. (Round your answers to two decimal places.) R=2% t=? tried to plug in as A=Pe^rt since continiously 3=e^.02t ? then take the ln of both sides? (...
September 17, 2016

PRE-CAL
Thank you so much!
September 17, 2016

PRE-CAL
Complete the table assuming continuously compounded interest. (Round your answers to two decimal places.) Initial Investment== ? Annual % Rate== ? Time to Double== 11YRS Amount After 10 Years== $1600 Using formula A=Pe^rt ?
September 17, 2016

Social Studies
Another word for lines of latitude is what?
September 13, 2016

Social studies
The degree of latitiude is always listed where It is a cross word
September 13, 2016

AP Chemistry
The reaction of 5.7 grams of fluorine with excess chlorine produced 7.6 grams of ClF3. What percent yield of ClF3 was obtained? Answer in units of %.
September 7, 2016

Physics
a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s? I keep getting the answer 34.3m/s but it is counted wrong. I found an answer on Chegg that say 29.4 m/s but I can't figure out how they are getting that answer.
September 2, 2016

AP Psychology
Jay Weiss, a psychologist, used electric shock on rats in a control group and rats in an experimental group. One group; however, was given a piece of wood to chew on. They had fewer ulcers (open sores or lesions in stomach lining). What is the independent variable and ...
August 31, 2016

AP Psychology
Jay Weiss, a psychologist, used electric shock on rats in a control group and rats in an experimental group. One group; however, was given a piece of wood to chew on. They had fewer ulcers (open sores or lesions in stomach lining). What is the independent variable and ...
August 31, 2016

Forensics
Strontium-90 is a radioactive waste product from nuclear reactors. It has a half life of 29 years. How many years would it take for a quantity of strontium-90 to decay 1/16 of its original mass?
August 31, 2016

Math
Write the greatest odd number that uses the digits 3 4 5 once each
August 29, 2016

Nouns
Sitting Bull's warriors soundly defeated General George A. Custer and his troops at the Battle of the Little Big Horn.
August 22, 2016

Math
70
August 22, 2016

Algebra/Quadratic Functions
The production cost (£C) ofa bicycle in a factory is given by the function C=2x^2-200x+5100, where x is the number of bicycles manufactured per day, find the number of bicycles manufactured per day such that the production cost is a minimum.
August 7, 2016

Chemistry
For the reaction, calculate how many grams of the product form when 3.2 g of CaO completely reacts. Assume that there is more than enough of the other reactant. CaO(s)+CO2(g)→CaCO3(s)
July 17, 2016

physics
a particle executing shm time period t from mean position the time to complete 5/8 oscillation
June 26, 2016

Algebra
With a full tank of gas, if you can drive 465 miles, your car can go 18 miles per gallon. Write an equation to show how many miles (use m for miles) you can drive after using _____ gallons of gas (use g for gallons).
June 25, 2016

Algebra
Geppetto is a puppet maker. He starts the month with 3 puppets ready to sell, and makes 9 puppets per day. Write an equation to model this situation (use d for days and p for puppets).
June 25, 2016

Algebra
After visiting the Titanic, Captain Brain and Mr. Pinky are taking the Alvin submarine back to the surface of the water. They start 1500 meters below the surface of the water, and ascend at 37 meters per hour. Note: under the water is a negative number. Write an equation to ...
June 25, 2016

Algebra
Ricardo visits different states every summer. This summer, he started with 3 states already visited and visits 6 states per day. Write an equation to model this situation (use d for days and s for states).
June 25, 2016

Algebra
Two cyclists, 128 miles apart, start riding toward each other at the same time. One cycles 3 times as fast as the other. If they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?
June 15, 2016

Algebra
After robbing a bank in Dodge City, a robber gallops off at 12 mi/h. 30 minutes later, the marshall leaves to pursue the robber at 16 mi/h. How long (in hours) does it take the marshall to catch up to the robber?
June 15, 2016

Algebra
thank you so much
June 15, 2016

Algebra
Valerie needs to rent a car on vacation. The rental company charges $17.95 plus 16 cents for each mile driven. If Valerie only has $50 to spend on the rental, what is the maximum number of miles she can drive?
June 15, 2016

Algebra
Statins are used to keep cholesterol in check and are a top selling drug in the US. The equation S-1.5x=6.4 gives the amount of sales (S) of statin in billions of dollars x years after 1998. According to this equation, how much will/did people spend on statins in the year 2008?
June 15, 2016

maths
Sorry I just typed any number this is my first time using this site....I didn't know that someone would help me with it... thank you
June 15, 2016

maths
11/2
June 15, 2016

maths
A man had16 mangoes.he gave1/4to bob and1/2tohis sister candy.how many mangoes remained after he shared with Bob and Candy?
June 15, 2016

Algebra
A wire 20 cm long is cut into two pieces. The longer piece is 4 cm longer than the shorter piece. Find the length of the shorter piece of wire
June 14, 2016

Math
angle theta is in standard position on a co-ordinate grid. the terminal arm of theta is in quadrent 2 on the line thats equation is 3x-4y=0. Determine the sine of this angle and then the measure of angle theta.
May 1, 2016

Math
During the month of June, Ava kept track of the number of days she saw birds in her garden. She saw birds on 18 days of the month. What experimental probability that she will see birds in her garden on July 1? Can somebody show me how to work this problem out?
April 28, 2016

Chemistry
use the appropriate standard reduction potentials in the appendix of your book to determine the equilibrium constant at 285 K for the following reaction under acidic conditions 4H+(aq) + MnO2(s)+2Fe+2(aq)----> Mn+2 (aq)+2Fe3+(aq)+2H2O(l) The reductions potentials are 1.23 V...
April 28, 2016

Chemistry
In my book it has 1.23 V and 0.770 V for the potentials for the oxidation and reduction equations.But I still can't figure out the answer.
April 22, 2016

Geometry
If you could fold a football field in half, the fifty yard line would the ? Line of symmetry
April 18, 2016

Geometry
Imagine a pie cut into four equal pieces. The angles formed by two adjacent pieces are A) supplementary B) Complementary I choose B is this correct? Imagine a pie cut into eight equal pieces. The angles formed by two adjacent pieces are? Supplementary (A) Am I correct??
April 18, 2016

Geometry
If you could fold a football field in half the fifty yard line would be the ? Find geometry term
April 18, 2016

Math
Thank You Alex!
April 13, 2016

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
April 13, 2016

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 ...
April 12, 2016

Physics
Thank you so much!
April 12, 2016

Physics
I know the formula is F=PA but I'm confused on the steps to take. Please help!
April 12, 2016

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 ...
April 12, 2016

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.
April 11, 2016

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
April 9, 2016

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 ...
April 9, 2016

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.
March 18, 2016

math
Find a formula for the inverse of the function. f(n)=4en3. f^[−1](Q)=
March 8, 2016

math
Find a formula for the inverse of the function f(x)=9−4/x2, x>0.
March 8, 2016

MATH.
so what is the answer
March 8, 2016

algebra
How do I write-17-16 as a equivalent addition?
March 6, 2016

english
Does
March 5, 2016

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?!?!
March 1, 2016

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 ...
March 1, 2016

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?
February 18, 2016

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 (...
February 18, 2016

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
February 18, 2016

Social Studies
i forgot to say oil
January 29, 2016

Social Studies
How do the United States and Canada use their natural resources? What are the effects of the use of these resources?
January 29, 2016

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
January 19, 2016

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
January 19, 2016

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
January 19, 2016

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.
January 17, 2016

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 ...
January 16, 2016

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 ...
January 7, 2016

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! :)
December 17, 2015

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...
December 10, 2015

geometry
find orthocenter triangle PQR .P(1,7)Q (1,2)R (11,2).
December 9, 2015

Science
1. We dissolve 0.005 mole of strontium chromate in 1 L of solution at 25°C. Will a precipitate be formed?
December 8, 2015

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. ???
December 8, 2015

math
1+2
November 30, 2015

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’ ...
November 29, 2015

History
D? I know that Britain is the answer to the last blank.
November 20, 2015

History
Yes, is it c? :)
November 20, 2015

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...
November 20, 2015

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
October 23, 2015

Algebra 1 HELP PLEASE!
Thankyou!
October 20, 2015

Algebra 1 HELP PLEASE!
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.
October 20, 2015

Algebra 1 HELP PLEASE!
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?
October 20, 2015

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?
October 19, 2015

Social Studies
long island
October 19, 2015

College
Please,i need a chemical balanced equation between diethyl ether+ conc.sulphuric acid+ glacial acetic acid
October 16, 2015

English
Its from the story of the flood told by Utnapishtm
October 13, 2015

English
What does "lay upon sinner his sin" mean?
October 13, 2015

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) ...
October 13, 2015

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?
September 24, 2015

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 ...
September 22, 2015

math
What is the z-score such that the area under the curve to the left is .48?
September 20, 2015

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 dont know what i should put i think m/s squared but i am not sure Express ...
September 19, 2015

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.
September 19, 2015

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&#...
September 19, 2015

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 ...
September 19, 2015

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 ...
September 16, 2015

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 (...
September 16, 2015

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
September 13, 2015

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. ...
September 13, 2015

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