# Posts by RAchel

Total # Posts: 1,527

**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.

*March 19, 2017*

**Math**

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

*March 19, 2017*

**Math**

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

*March 19, 2017*

**math**

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

*February 26, 2017*

**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...

*February 26, 2017*

**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?

*February 26, 2017*

**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?

*February 26, 2017*

**math**

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

*February 25, 2017*

**math**

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

*February 25, 2017*

**math**

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

*February 25, 2017*

**math**

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

*February 25, 2017*

**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...

*February 23, 2017*

**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

*February 12, 2017*

**math**

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

*February 9, 2017*

**Math**

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

*February 9, 2017*

**Math**

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

*February 6, 2017*

**Calculus**

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

*February 4, 2017*

**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?

*January 17, 2017*

**Math**

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

*January 17, 2017*

**Trigonometry**

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

*January 17, 2017*

**Math**

Thank you

*January 17, 2017*

**Math**

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

*January 17, 2017*

**Math**

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

*January 3, 2017*

**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 ...

*November 28, 2016*

**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 ...

*November 20, 2016*

**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?

*November 4, 2016*

**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?

*November 3, 2016*

**Algebra**

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

*November 1, 2016*

**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

*October 28, 2016*

**math**

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

*October 19, 2016*

**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?

*October 18, 2016*

**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?

*October 17, 2016*

**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.

*October 3, 2016*

**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*

**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 that's 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*

**Math troubles**

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

*March 27, 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*

**physics**

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

*March 2, 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*