Friday

November 27, 2015
Total # Posts: 743

**Chemistry**

What is the total number of joules of hear needed to change 200g of ice to water at O degree Celcius?
*November 21, 2015*

**alegbra**

From a point on a straight road, 2 cars are driven in opposite direction. One care at 69 miles per hour and the other at 27 miles per hour. How many hours will they be 480 miles apart?
*November 7, 2015*

**science**

why is it important for a cell to grow before it replicates its DNA?
*November 1, 2015*

**Math**

Socks are on sale 4 Pairs for $5. How much would you pay for 8 Pairs of socks?
*October 20, 2015*

**physic**

In compressed state, a spring 3.00 meters long hanging from the ceiling has a potential energy of 2.0 joules. If the entire potential energy is used to release a ball of mass 1.2 kilograms vertically downward, then what is the kinetic energy of the ball when it reaches the ...
*October 16, 2015*

**Solving Linear Equations (Math)**

The length of a rectangle is 5m shorter than three times the width. The perimeter is 46m. Find the length of each side.
*September 24, 2015*

**IPC**

A motorcyclist changes the velocity of his bike from 20.0 meters/second to 35.0 meters/second under a constant acceleration of 4.00 meters/second2. How long does it take the bike to reach the final velocity?
*September 23, 2015*

**math - age problem**

3 years ago, Vin’s age is 3 times the age of Paul. At the present, Vin’s age is twice the age of Paul. What would be their age 3 years from now if the sum of their present age is 18?
*September 13, 2015*

**math**

1.) 3 years ago, Vin’s age is 3 times the age of Paul. At the present, Vin’s age is twice the age of Paul. What would be their age 3 years from now if the sum of their present age is 18? 2.) Willie bought a jacket for 26.86 pesos. The jacket’s price had been ...
*September 13, 2015*

**algeb**

help please :) 1.) 3 years ago, Vin’s age is 3 times the age of Paul. At the present, Vin’s age is twice the age of Paul. What would be their age 3 years from now if the sum of their present age is 18? 2.) Willie bought a jacket for 26.86 pesos. The jacket’s ...
*September 13, 2015*

**math**

Insert parentheses to make the statement true; 6 x 5 - 2^2 = 45
*September 9, 2015*

**History**

It is A. Increase in tres in exploration.
*September 2, 2015*

**math **

Which rate of speed is higher. A car completing a 500-mi race in 3 1/3 hours or a car completing a 300-hours in about 2 1/2 hours
*September 1, 2015*

**Life Science**

determing whether expired air contains CO2. 1.Formulate hypothesis 2.Aim 3. a) idependent V, dependent and controlled variables 4. methods step by step 5. observation
*August 20, 2015*

**Chemistry**

How many moles of Ag2CrO4 will be produced from 6 moles of AgNO3?
*August 1, 2015*

**HCCC**

7/3+1/3y=3y-3
*June 27, 2015*

**algebra**

That's wrong. ^
*June 22, 2015*

**Geometry**

Find the circumference of a circle with a radius of 6 in. A:6in B:12in C:6 pi in D: 12 pi in
*June 1, 2015*

**Geometry**

In a 30,60,90 triangle 1: If b=12, find c 2: If b=3,find a Letter a is on the 90° side, b is on the bottom near 60° and c is near 30°. Could anyone explain how to do this? It's hard to understand from my textbook.
*May 19, 2015*

**Geometry**

Cross multiplication 20+x = 6 ----- - x 5 Idk how to solve this with 2 x's
*May 13, 2015*

**Geometry**

Yes it's a 90, 45 45 triangle. And the letters go like this. A C B
*May 12, 2015*

**Geometry **

For questions 38-40 use the triangle. |\ 45° angles for the top of the | \ triangle and the bottom right | \C | \ 38: If a=12, find b | \ 39: If b=2,find c | \ 40: If c=12,find a -------- B. Is this pythagorean Therorem? When I try it that way it's not working out? ...
*May 12, 2015*

**Geometry**

Thank you!
*May 5, 2015*

**Geometry **

True or False? In an obtuse triangle all the angles are obtuse. I think it's false but I'm not sure.
*May 5, 2015*

**Pre-Calculus**

Explain the difference between sin^-1(x) and 1/sin(x), Are there different expressions for both these functions?
*April 28, 2015*

**Geometry**

A school's wrestling mat is a square with 50 ft sides. A circle 28 ft in diameter is painted on the mat. No wrestling is allowed outside the circle. Find the area of the part of the mat that is NOT used for wrestling. Use pie=22/7.
*April 27, 2015*

**algebra**

solve for x, y and z when 2x + 4y + 2z = 144 4x + y + 0.5z = 120 x + 3y + 4z = 144
*April 18, 2015*

**math (algebra)**

An entrepreneur has the following costs and revenue functions: TC = 30 + 3Q and TR = 4Q. Calculate the equilibrium quantity algebraically and graphically at the break-even point.
*April 18, 2015*

**math**

that is basically the statement don't understand it too.
*April 18, 2015*

**math**

it costs $80 to produce any quantity of output and $1.60 for any additional unit of output. write down the equation and graph the total cost function
*April 18, 2015*

**Chemistry **

CaCO3 ----------> CaO + CO2 When 45 grams of calcium carbonate decomposes, how many grams of calcium oxide are produced?
*April 16, 2015*

**cylinder word problem**

Caitlin enjoys italian ices with her friends. The place scoops the ices into a cylindrical cup that has a radius of 3 cm and a height of 8 cm. each ice is topped off with a half scoop. Each scoop has a radius of 3 cm. What is the total amount of ice that is in Caitlin's ...
*March 24, 2015*

**Algebra help please**

Part A: Divide (16x^5y^4 + 6x^3y - 2x^2y - 24x^2y^4) by -2x^2y. Part B: How would your answer in Part A be affected if the x2 variable in the denominator was just an x? Part C: What is the degree and classification of the polynomial you got in Part A? Is this first part right...
*March 18, 2015*

**Acceleration**

How did you do the work? I don't see it, not getting it.
*March 5, 2015*

**Acceleration**

I need help with the second part of this question. Please show work so I can see. Thanks. I. The fastest land mammal, the cheetah, can accelerate from 0 mi/hr to 70.0 mi/hr in 3.0 seconds. What is the acceleration of the cheetah? Give your answer in units of mph/sec. I got 23....
*March 5, 2015*

**Economics**

Clem Oatley could grow wheat and barley. He could grow 75 bushels of wheat or 125 bushels of barley using the same resources on an acre of his land. The price of wheat is $2.00 per bushel and the price of barley $ 0.80. Show the benefits to Clem from specialization. What ...
*February 10, 2015*

**math work for workeys**

Ok so I have an example and I used it for my work. First I'll show the example. Multiply a mixed number with a whole number. 4 times 2 and 1/8 . You multiply 4 times 2 and 4 times 1/8. Get 8 + 4/8. Simplified and got 8 and 1/2. The problem that I got was. You are a lead ...
*February 3, 2015*

**math work for workeys**

Ok so I have an example and I used it for my work. First I'll show the example. Multiply a mixed number with a whole number. 4 times 2 and 1/8 . You multiply 4 times 2 and 4 times 1/8. Get 8 + 4/8. Simplified and got 8 and 1/2. The problem that I got was. You are a lead ...
*February 3, 2015*

**Pre-Calculus**

find all the maximums of the polynomial f(x)=x^2-8x+11 What is the global (absolute) maximum?
*February 3, 2015*

**Pre-Calculus**

Describe the function resulting from reflecting f(x)=x^3+2x^2-x+5 about the x-axis and then the y-axis. Does the order of the reflections matter?
*February 3, 2015*

**chemistry**

isotope chromium -51 has a half life of 28 days. If the original sample had a mass of 28.0 grams, what mass of chromium -51 sample remains after 84 days?
*December 11, 2014*

**Math**

What is 8 and 2 over 20 minus 6 and 8 over 20 8 2 - 20 8=? 2=? 20=?
*November 14, 2014*

**physics**

a boom 4.7 meters,10000 kg, 20 degree angle, find torqe on the pivot i fond force=10000x9.81= 98100 N perpindiclar force = 33552 N torqe = 4.7x33552 = 167695 Nm i am told this is wrong
*November 14, 2014*

**Pre-Calculus**

I really need help on this question Simplify the expression by using a Double-Angle formula or a Half-Angle Formula cos^2 0/2-sin^2 0/2
*November 12, 2014*

**math**

A plane travels 1020 miles from New York City to Minneapolis in 3.3 hours. The return trip takes 2.75 hours. a. How many times faster is the return trip?
*November 3, 2014*

**statistics**

Suppose that in a large population the proportion of people that have a certain disease is 0.01. Use the Poisson approximation to find the probability that at least four people will have the disease in a group of 400 randomly selected people.
*November 2, 2014*

**inequalities**

Determine when the function f(x)=3x^3+4x^2-59x-13 is less than 7
*October 13, 2014*

**Chemistry **

How many liters of liquid nitrogen are produced when 360.0 L of nitrogen gas is liquified at 77.36 kl
*October 9, 2014*

**Algebra**

Perform the indicated operation or 6x/16+1/16
*October 3, 2014*

**Pre-Calculus**

Find a polynomial of degree 4 that has a integer coefficients and zeros 1,-1,2 and 1/2 (one half)?
*September 14, 2014*

**Math**

How many x-intercepts and how many local extrema does the polynomial P(x)= x(sqrt)3-4x have? How many x-intercepts and how many local extrema does the polynomial Q(x)=x^3-4x have? and If a>0, how many x-intercepts and how many local extrema does each of the polynomials P(x...
*September 7, 2014*

**Biology**

Plant -+ Deer --+ Tiger The first step in the energy chain that created the bonds of proteins in the tiger's muscle cells in the food chain shown above is the A. deer the tiger ate. B. plant the deer ate. C. photons the sun made. D. carbohydrates the plant made. I think it...
*July 13, 2014*

**chemistry**

Which one of these is NOT a mechanism of heat transfer Select one: a. Reflection b. Radiation c. Convection d. Conduction
*June 22, 2014*

**chemistry**

Which one of the following statements regarding ideal gas laws is FALSE? Select one: a. An ideal gas has an infinite heat capacity b. The macroscopic ideal gas equation is PV = nRT c. The temperature must always be measured in Kelvin (K) d. A single molecule of gas has kinetic...
*June 22, 2014*

**English**

Meredith- "I can't believe we graduated!" Sara- "Ugh high school why." Meredith- "Can you not." Sara- "Fine, I'm super excited and just can not wait!" Meredith- smirks "I know you're being sarcastic but lovely enthusiam...
*May 4, 2014*

**English**

What kind of dialogue should I write with this? Write an example of a very brief dialogue between at least 2 people who are talking about a recent event. The characters should be about your age(15).
*May 4, 2014*

**english**

I need help with some conversation examples! 1) Write an example of a conversation between at least 2 adults who are talking about the possibility of one of them getting a new promotion with their current company. 2) Write an example of a very brief dialogue between at least 2...
*May 4, 2014*

**Chemistry**

comparing and contrasting why is sodium hydrogen carbonate an effective antacid but sodium hydroxide is not?
*April 27, 2014*

**Astronomy**

3142
*April 21, 2014*

**Math**

Brian's boat has a top speed of 9 miles per hour in still water. While traveling on a river at top speed, he went 10 miles upstream in the same amount of time he went 20 miles downstream. Find the rate of the river current.
*April 14, 2014*

**Calculus**

At what interval is e^(-5x^2) concave up? I know the second derivative is 100x^2*e^-5x^2-10*e^-5x^2 but I just can not figure this one out. Thank you for your help!
*March 28, 2014*

**social studies check answers**

2 3 7 9 10 answers
*March 25, 2014*

**philosophy (john dewey)**

The expected outcome or pattern of Developed Standards of "Rules of Conduct", "Moral Training" and "School Organizations" served to meet the national demands. What is the problem with this being upheld in our educational system?
*March 1, 2014*

**math**

Mr Tan has some amount of money. If he distributes equally to 2 persons, he left with $1. If he distributes equally to 3 persons, he left with $2. If he distributes equally to 4 persons, he left with $3. If he distributes equally to 5 persons, he left with $4. If he ...
*February 13, 2014*

**statistics, math, college**

if np >5 and nq>5 estimate P (fewer than 4) with n=13 p=0.4 by using normal distribution as an approximate to the binomial distribution if np <5 or nq< then state that the normal approximation is not suitable
*February 11, 2014*

**statistics, math, college**

assume that adults have I.Q scores that are normally distributed with a mean of 100 and a standard deviation 15. find p2 which is the IQ score seperating bottom 2% from the top 98%
*February 11, 2014*

** statistics**

The assets(in billions of dollars) of the four wealthiest people in a particular country are 43,25,21,15 assume that samples of size n=2 are randomly selected
*February 10, 2014*

**geometry**

v-2/81pir2h
*February 2, 2014*

**chemistry**

What will be the average density for a sample of metal with a mass of 12.6 g and volume calculations of 7.8 mL and 8.3 cm3 ? Omit units in the answer and report answer to one decimal place.
*January 22, 2014*

**chemistry**

What will be the average density for a sample of metal with a mass of 12.6 g and volume calculations of 7.8 mL and 8.3 cm3 ? Omit units in the answer and report answer to one decimal place.
*January 22, 2014*

**Math**

A 6 ft man stands by a 30 ft tower and casts a 10 ft shadow. How long is the shadow cast by the tower and what time is it?
*December 16, 2013*

**Math**

A 6 ft man stands by a 30 ft tower and casts a 10 ft shadow. How long is the shadow cast by the tower and what time is it?
*December 16, 2013*

**math**

How many nickels and dimes does it take to make $1.95
*December 10, 2013*

**math**

370.9090900909090909909090909
*December 9, 2013*

**Half-life**

After two hours, 1/16 of the initial amount of a radioactive isotope remains undecayed. What is the half-life of the isotope?
*November 18, 2013*

**algebra**

thank you I'll check back with my teacher.
*November 13, 2013*

**algebra**

Sorry about the signs. The answer was suppose to be 2 seconds. That's what I'm not understanding. I'm coming out with what you have- I moved over the 2 and that left the t^2 = 39/2 but that doesn't come out to be two seconds which is suppose to be the answer
*November 13, 2013*

**algebra**

I'm stuck with this problem. h = -16t^2 + 312 the "t" is seconds after object released and h stands for height. We're suppose to set the equation to 0 so far this is what I have: -16t^2 + 312 = 0 -8(2t^2+39)= 0 -8=0 can be disqualified but how do I factor out...
*November 13, 2013*

**physics**

A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.
*November 5, 2013*

**physics**

A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.
*November 5, 2013*

**physics**

A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.
*November 5, 2013*

**maths**

Mr john has 350 layers, on the average, each hen lays two eggs per day.how many eggs will he expect after six days?
*November 3, 2013*

**Statistics**

356 hours
*October 19, 2013*

**math **

Everett made 3/5 of the baskets he shot. Suppose he shot 60 baskets. How many did he make?
*September 17, 2013*

**math**

There is something wrong with this definition for a pair of vertical angles: “If AB and CD intersect at point P, then APC and BPD are a pair of vertical angles.” Sketch a counterexample to show why it is not correct. Can you add a phrase to correct it?
*September 15, 2013*

**Math**

The Product of 2 consecutive odd numbers is 783. What are the numbers?
*August 19, 2013*

**math**

Steve the answer according to my book is 147
*August 19, 2013*

**math**

Assume the average height and weight of a female in your math class is 5'5" and 140 pounds. Use this information to write a variation equation then use it to find the weight of the female below if they had the same body type as the average female. Round answer to the ...
*August 19, 2013*

**Math **

If I went to the bank and fianaced $81,000 at 9% for 25 years what would my monthly principal and interest payment be?
*July 17, 2013*

**world geography**

As of 2008, the population of Australia was 21.3 million, and the population of New Zealand was closer to ________ million
*June 22, 2013*

**Physics**

A block of mass m1=1.6kg, initially moving to the right with a velocity of +4m/s on a frictionless horizontal track, colides with a massless spring attached to a second block of m2=2.1kg moving left with a velocity of -2.5m/s. The spring constant is 600 N/m. A) assuming the ...
*June 5, 2013*

**math**

2/3 + 3/5= 5/6 - 3/4= 3/5 X 2/5= 1/2 DIVIDE 5/8=
*June 1, 2013*

**chemestry**

polycarbonate has a density of 1.2 g/cm3. a photo frame is constructed from two 3.00mm of polycarbonate.Each sheet measures 28 cm by 22cm. what is the mass of the photo frame?
*May 18, 2013*

**Physics**

A ball is fastened to one en of a 28 cm string, and the other end is held fixed to a support. The ball whirls in a horizontal circle. Find the speed of the ball in its circular path if the string makes an angle of 35 degrees to the vertical.
*May 16, 2013*

**Chemistry**

Calculate the pressure exerted by a 14.6 mol NH3g in a 3.2 L container at -15.0 celcius using the Van der Waals equation.
*May 15, 2013*

**chemistry**

calculate the heat energy required to raise the temperature of a 500. gram iron pipe from 25 degress celcius to 100 degrees celcius. the specific heat for iron is .45 J/g degrees celcius
*May 12, 2013*

**Biochemistry**

what's transcription?
*May 11, 2013*

**Biochemistry**

what's transcription?
*May 11, 2013*

**Biology**

Consider the close-up view of a segment of DNA undergoing transcription from left to right. Transcription begins at and includes the G/C base pair shown in bold green type.
*May 11, 2013*

**C/Justice**

Inmate Code refers to the rules and values that have developed among prisoners inside prisons social systems.[1] The inmate code helps define an inmate's image as a model prisoner. The code helps to emphasize unity of prisoners against correctional workers. This code ...
*May 9, 2013*