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Posts by RAchel

Total # Posts: 1,538

science
How would you separate a mixture of small beads, sand, iron filings, salt, and water, using a magnet, filter funnel, filter paper, bunsen burner and a tripod with a bunsen burner? I thought of Filtration, Evaporation, Distillation, Magnetism, and even Sieving but only 4 of ...

Geography
Why did the original farms on the Prairies turn out to be too small? What happened as a result of this?

chem
How many moles of O2 are contained in 5.25 L at 26 degrees Celsius and 1.2 atm?

Pre calc
Sorry steve not everyone is as smart as you. Thanks for your help tho

Pre calc
Please help me proof the identity. This isn't even math to me, I can not understand it so please show all work. God bless A)1-cos2x/sin2x=tanx B) sin4x/sinx=4cosxcos2x

Pre calc
Thats still the wrong answer

Pre calc
The answer I keep getting is -3 square root of 10 over 130

Pre calc
sin(? ? ?); tan(?) = 5/12 ? in Quadrant III, sin(?) = ? sqaure root 10/10 ? in Quadrant IV I tried this numerous times can somone please help me

Chemistry
Assume you are performing the calibration step and you begin with 70 g of water at 20*C and 70 g of water at 80*C. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the temperature of the ...

precal Please Help
1-cos (2A)/2sin A+ SIN (2A)= tan (A/2) I need to verify the identity I have no idea how to do that and I have a test please explain!!!

Calculus
the problem is asking me to use optimization to find the minimum surface are and then determine how much it would cost to make it

Calculus
A manufacturer needs to produce a cylindrical can with a volume (capacity) of 1000cm cubed. The top and the bottom of the container are made of material that costs $0.05 per square cm, while the side of the container is made of material costing $0.03 per square centimeter. ...

pre calc
To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal. An observer D = 600 m away measures the angle of elevation to the spot of light to be 45°. Find the height h of the cloud cover. (Round your ...

A.P Chemistry
For a certain reaction ?H is 54 kJ/mol and ?S is 128 J/mol · K. This reaction can become spontaneous only above some temperature. What is this temperature? Answer in units of ?C.

Math
Find the magnitude and direction angle of p = 42i + 35j

Math
Find the exact value of the trig function below. cos a/2 if cosa = - 31/49 (assume cos a/2 is negative)

civics
C. Major rule. The people were supposed to be able to have control over the laws that were made and how their country was ruled. Decisions were made based on the majority of opinion.

math
I meant to type that it seemed like it would cost at least 1,000

math
The annual cost of a gym membership can be represented by the function C(t)=300-5t, where t is the number of years that one has belonged to the gym. If Jeffrey has been a member for 5 years, what is the total amount of money that he has paid to the gym over the past 5 years. I...

math
There are 4 romantic novels and 6 adventurous novels on a book shelf. Without looking, Carmen chooses two novels out of the shelf. What is the probability that she chooses 2 romantic novels?

math
The probability that Jeff will be accepted to Green Valley College is 3/4, and the probability that Justin will be accepted to Blue Ridge College is 2/5. What is the probability that Justin will be accepted and Jeff will not?

math
If 8^x = 12, then 24^x = ? Estimate your answer to one decimal place.

math
If 8.2^p = 10.5^q, then p/q = ? Estimate your answer to two decimal places.

math
That was my mistake. It was supposed to say k=?

math
If 16x^2 - 24x + k = 0 has two roots (a double root) equal to 3/4, 4 = ?

math
For his troops' popcorn fundraiser sale, Mike sold caramel corn for $10, buttered microwave popcorn for $8, and lightly buttered popcorn for $7. By the end of the fundraiser, he had sold 400 items and made $3,272. If he sold twice as many lightly buttered microwave popcorn...

physics
a force of 372 N is used to move a piano with a maass of 532 kg up a ramp 14 m long. what is the vertical height of the ramp

math
If g(x)=x+3 h(x)=9-x^2, what is the maximum of h(g(x))?

Math
If cscØ = 4/3, find sinØ + sinØ cot^2 Ø

Math
If g(x)=x+3 h(x)=9-x^2, what is the maximum of h(g(x))?

Calculus
Find the magnitude and direction angle of p=42i+35j

Math
A line has parametric equations x=7t-2 and y=-4+3t. What is the slope of the line representing the direct relationship between x and y?

Math
Thanks. All of this was right except it was southwest instead of northeast.

Trigonometry
Find the magnitude and direction angle of v = -7i + 3j

Math
Thank you

Math
Find the components of vector u with a magnitude of 10 and a direction angle of ?=54° Help??

Math
1/3 pitcher water + 2 apple juice - 1/3 carton milk =

write teacher
Interesting Facts about Frederick Douglass Douglass was married to his first wife Anna for 44 years before she died. They had five children. John Brown tried to get Douglass to participate in the raid on Harpers Ferry, but Douglass thought it was a bad idea. He was once ...

Math, Quadratic equaitons
A toy rocket is launched form a 3m platform, at 8.2m/s. The height of the rocket is modelled by the equation h=-4.0t^2+8.1t+3 where h is the height, in metres, above the ground and t is the time, in seconds. After how many seconds will the rocket rise to a height of 6m above ...

Math
a recipe for 2 dozen cookies calls for 1 1/3 cups of flour.how much for would be needed to make five dozen cookies?

Statisics
The closing price of Schnur Sporting Goods Inc. common stock is uniformly distributed between $23 and $37 per share. What is the probability that the stock price will be: More than $33? Less than or equal to $27?

Algebra
Find the next three terms of the Arithmetic sequence, 3/4,1/2,1/4,1,..

Math
I have a dash of sugar and I need to add flour with a 1:10 weight ratio of sugar to flour so how much flour do I need

math
form a polynomial with a degree of 4 zeros 4,-3i,1 and multiplicity 2

Physics
A shopper pushes a cart 50 m south down one aisle and then turns 90.0° west and moves 12 m. He then makes another 90.0° turn and moves 20 m. What is the largest possible displacement of the shopper?

PRE-CAL
Factor the trigonometric expression. There is more than one correct form of the answer. cot^2 x + csc x − 19 NOT SURE WHETHER TO REPLACE THE COT WITH COS^2X/SIN^2X THEN CSCX TO 1/SINX?

Science
Answer with solution, plz. 1. What is the concentration of the solution by volume when dissolved is used 30 grams & the water is 60 grams. 2. How much solvent in grams is present in a solution with a concentration by volume of 40% the solute of content is 60 grams.

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

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.

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 ...

PRE-CAL
ok this worked out great! thank you!

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

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? (...

PRE-CAL
Thank you so much!

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 ?

Social Studies
Another word for lines of latitude is what?

Social studies
The degree of latitiude is always listed where It is a cross word

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 %.

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.

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 ...

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 ...

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?

Math
Write the greatest odd number that uses the digits 3 4 5 once each

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

Math
70

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.

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)

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

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).

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).

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 ...

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).

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?

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?

Algebra
thank you so much

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?

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?

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

maths
11/2

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

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

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

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?

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...

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.

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

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??

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

Math
Thank You Alex!

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

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)=

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