# Joel

Most popular questions and responses by Joel-
## Business Calculus

An ice cube that is 3 cm on each side is melting at a rate of 2 cm cubed per minute. how fast is the length of the side decreasing?

*asked on October 21, 2010* -
## Social studies

why does the cartoon from the bank war 1832 portrat president jackson as a king

*asked on November 22, 2016* -
## geometry

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radii and altitudes is 4:3?

*asked on March 6, 2018* -
## Maths

Prove By induction that sinx + sin3x + sin5x +.... Sin(2n-1) =sin^2(nx)/sin3x

*asked on September 7, 2016* -
## college trig word problem

A Ferris wheel has a radius of 25 feet.The wheel is rotating at two revolutions per minute.Find the linear speed, in feet per minute, of a seat on this ferris wheel.

*asked on December 15, 2012* -
## Chemistry

2. In a calorimeter, 40.0g water at room temperature (20.4 C) was mixed with 60.0 g of water that was initially 48.9 C. The resulting mixture reached a maximum temperature of 37.3 C. Calculate each of the following. a) The heat released by the hot water.

*asked on April 16, 2013* -
## math

A stunt motorcyclist makes a jump from one ramp 20 feet off the ground. The jump between ramps can be modeled by y= -1/640x^2 + 1/4x +20 where x is the horizontal distance (in feet) and y is the height above ground (in feet). I think a is 20 feet, but I

*asked on September 24, 2013* -
## CHemistry

Which one of the following is expected to be the strongest Lewis acid? Fe, Fe+, Fe2+, Fe3+ Which do you think would accept electrons the easier? Fe(s) or Fe^+? Do that same kind of logic on the others one by one.

*asked on April 27, 2007* -
## Chemistry

How do I calculate the mass of sodium carbonate required to neutralize 15-20 mL of 0.25M HCl at the stoichiometric point?

*asked on May 17, 2012* -
## physics

A flywheel is making 180 r.p.m. and after 20 seconds it is running at 140 r.p.m. How many revolutions will it make, and what time will elapse before it stops, if the retardation is uniform ?

*asked on December 31, 2014* -
## History

which represents an aztec adaptation to their environment A. A surplus of farmed crops B.an accurate 365 day calendar C.a system of causeways D.farming in terraces

*asked on September 27, 2016* -
## Math

Help! Toshiro Hashimoto invested some money at 4.5% simple interest and $1000 more than four times the amount at 6%. His total annual income for one year from interest on the two investments was $801. How much did he invest at each rate?

*asked on September 15, 2010* -
## chem

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 3.10 of sodium carbonate is mixed with one containing 4.43 of silver nitrate. How many grams of silver nitrate are

*asked on February 23, 2015* -
## Can't understand trig problem

An airplane left an airport and flew east 174 miles. Then it turned northward flying along a bearing of N22E. When it was 254 miles from the airport, there was an engine problem and it turned back to take the shortest route possible back to the airport.

*asked on February 1, 2010* -
## Principles of Management

Question 1 of 20 5.0 Points Which of the following is NOT a benefit of planning? A. Helps you check on your progress B. Helps you think ahead C. Helps you cope with uncertainty D. Helps you compare your results to a standard Reset Selection Question 2 of

*asked on April 22, 2013* -
## History

what statement best describes the government relationship with England that was in the middle colonies A. Middle colonies were all established as royal colony B.each have a different system based on the charter agreed upon with the king of England C.The

*asked on September 12, 2016* -
## Physics

Two points charges of 2uC and -6uC are located at the position(0.0)m and (0.3)m.Calculate the total electrical potential at the point (4.0)m due these two charges.

*asked on January 17, 2011* -
## physics

A cage descends a mine shaft with an acceleration of 0.5 m/s2. After the cage has travelled 25 metres, a stone is dropped from the top of the shaft. Determine : 1. the time taken by the stone to hit the cage, and 2. distance travelled by the cage before

*asked on December 31, 2014* -
## math

The sum of two decimal numbers is 3.9 Their difference is 0.9,and their product is 3.6 What are the two numbers?

*asked on September 24, 2013* -
## Maths

Prove That Sin2A+ Sin2B +SIN2C/sinA+SINB+SINC=8sinA/sinB/2COSC/2

*asked on July 28, 2016* -
## Chemistry

If an equal number of moles of the weak acid HOCN and the strong base KOH are added to water, the resulting solution will be acidic, basic or neutral? There is a complicated answer and a sensible answer. Both arrive at the same answer. But here is the

*asked on April 27, 2007* -
## english

what is the allusion. Last year our school’s finances were in shambles. Overspending and little control over money has resulted in a situation where there is no money for new books or supplies. School officials are even wondering where they will find the

*asked on May 17, 2011* -
## Algebra 1

how do i graph x + y = 1 put y on one side y=-x+1 im doing an online test and its asking me to find the equation that matches the graph. But im not sure how to figure it out. well the graph should have a negative slope with 1 as y-intercept look for a

*asked on March 20, 2007* -
## math

c. What do the slope and y-intercept mean in the context of this problem? Hint: What do you pay when you step into the cab?

*asked on December 6, 2016* -
## algebra

Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -3x + 4y = -19.5 -3x + y = -10.5

*asked on February 22, 2011* -
## Maths

Prove that cos3x/cosx-cos6x/cos2x=2(cos2x-cos4x)

*asked on July 28, 2016* -
## math

I am a 2-digit number. My ones is 3 more than my tens and the sum of my digits is 11. What number am I ?

*asked on November 24, 2017* -
## Maths

Prove That Sin2A+SIN2B+SIN2C/SINA+SINB+SINC=8SinA/2SINB/2SINC/2

*asked on July 28, 2016* -
## Chemistry

If the temperature of 150.0g of water increased from 23.3C to 44.8C, how much heat was absorbed

*asked on April 9, 2013* -
## Calculus - Related Rates

Bacteria are growing in a circular colony one bacterium thick. The bacteria are growing at a constant rate, thus making the area of the colony increase at a constant rate of 12 mm sq. per hour. Find an equation expressing the rate of change of the radius

*asked on November 29, 2009* -
## Math

Parmjit has 8 base ten blocks. She has at least one of each type of block. The value of her blocks is between 400 and 600. What blocks could she have? Find the possible answers using an organized list.

*asked on October 13, 2016* -
## lit

"One day I'm going to be an astronaut," Adelle told her sister. Did I punctuate correctly?

*asked on May 10, 2011* -
## Maths

Cynthia’s afternoon train normally arrives at her station at 5:30 pm each day, where she is picked up by Alan and driven home. One day she was on an earlier train which arrived at 5 pm, and she decided to walk in the direction Alan was coming from home.

*asked on March 9, 2017* -
## Maths

Mr Zubir bouught a pair of pants, a shirt and a coat. The pair of pants and shirt costs $100.90. The pants and coat costs $244.50. The coat costs 5 times as much as the shirt. How much did Mr Zubir pay for his coat?

*asked on August 14, 2011* -
## lit

n 1946, Albert Einstein said if he had known the Germans wouldn't succeed in constructing the atom bomb, he "would never have lifted a finger." Did I punctuate correctly?

*asked on May 10, 2011* -
## lit

"Ouch, that hurts!," Kadra said after stubbing her toe. is this correct?

*asked on May 10, 2011* -
## Chemistry

What is a photon? Several selections may be correct. Has an energy of equal to hν. Is a unit of electromagnetic radiation. Is a part of the electromagnetic spectrum. Is usually called visible light. None of these.

*asked on March 14, 2011* -
## Physics

A proton is released from rest in a uniform electric field which is directed along the x axis and of magnitude E=2*10exponent5 V/m.The proton undergoes a displacement from point A at the origin to point B at x=0.2m.What is the change in the potential

*asked on January 17, 2011* -
## physics

How much kinetic energy does a 2000 kg traveling 70 mph have?

*asked on January 24, 2012* -
## LIT

Dresden was a German city destroyed by the allies in WWII. Which of the following most likely describes the allusion to Dresden? A Dresden was the center for the production of weapons that supported the German war effort. B Dresden was a city rich with old

*asked on May 17, 2011* -
## Statistics

The amount of fill(weight of contents)put into a glass jar of spaghetti sauce is normally distributed with mean=850g and standard deviation=8g.the probability that a random sample of 24 jars has a mean weight greater than 848g is?need help

*asked on March 23, 2011* -
## math

Write a missing addend addition sentence to help solve 78-49.explain how you would use it.

*asked on January 2, 2011* -
## geometry sem 2 APEX

Question 1 of 10 Multiple Choice: Please select the best answer and click "submit." A closet contains 8 pairs of pants, 10 shirts, and 4 pairs of shoes. How many leaves on a tree diagram would represent all possible combinations of outfits? A. 80 B. 22 C.

*asked on March 14, 2018* -
## Geometry

Can you tell em if this is right? If not, can you tell me what words go where? A truth value statement can be written in the form “if P, then Q.” This “if, then” statement can be true or false. The “if” part is called the hypothesis, and the

*asked on October 9, 2012* -
## lit

Jocelyn asked her mom, "What was it like when you were a child?" Did I punctuate correctly?

*asked on May 10, 2011* -
## Physics

A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what

*asked on February 2, 2011* -
## Social Studies

What is Nunavut's nickname and motto? Scroll down to the weather section of this site for Nunavut's nickname. (Broken Link Removed) This site has its motto. http://homeschooling.about.com/library/blcanumotto.htm

*asked on February 8, 2007* -
## Maths

A right circular cone is circumscribed about a sphere of radius a .If h is the distance from the centre of the sphere to the vertex of the cone. Show that the volume of the cone is 1/3pi a^2(a+h)^2/(h-a). Find the angle of a cone when the volume is minimum

*asked on August 9, 2016* -
## Math

The Distributive Property: Find the product mentally. Show the steps you used. 8*34 I know that 8*34=272 but how you do it with Distributive Property? Thanks!

*asked on January 28, 2016* -
## One SS Question!

What was one event that helped make the US a world power? a. The country experienced the Great Depression. b. The country fought in World War I *** c. The country the Peace of Paris. d. The country fought in the French and Indian War.

*asked on January 26, 2016* -
## Chem

The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.

*asked on April 4, 2013* -
## lit

When Marcos walked into the room, we turned on the lights and yelled, "Happy birthday!" is this correct punctuation?

*asked on May 10, 2011* -
## math

Tyrell says $750 is about $800.Sara says $750 is about $700.who is correct?explain.

*asked on September 22, 2010* -
## Math

the question is to "rotate the line the given number of degrees a about the x-intercept and (b) about the y-intercept. Write the equation of each image" and the problem is y=2x+2 ; 90 degrees and i dont know what to do

*asked on April 3, 2018* -
## math

If Matt filled a 2 1/5 cup container, how many 1/5 cups would he need to use??

*asked on February 12, 2015* -
## Physics

1 Angstrom = how many Coulombs?

*asked on August 29, 2014* -
## Physics

An infinitely long thin metal strip of width w=12cm carries a current of I=10A that is uniformly distributed across its cross section. What is the magnetic field at point P a distance a=3cm above the center of the strip? I have tried using the integration

*asked on April 4, 2014* -
## lit

"Maybe we should wait to begin until everyone is seated," Ana said to her band mates. did I punctuate this correctly?

*asked on May 10, 2011* -
## lit

Antony invited us over to check out his, "awesome new board." is this correct

*asked on May 10, 2011* -
## Lit class

Did I punctuate this correctly? "Daddy, why is the sky blue?" Martinique asked her father. the quotation mark goes behind the question mark right?

*asked on May 10, 2011* -
## Algebra

6x²y³ + 9x²y³ 15x²y³ ------------- = ---------- 3x²y² 3x²y² = (15/3) (x²/x²) (y³/y²) = 5y Just want it to know if is correct, but don't y³ + y³ = 2y³? I'm confused now. Can someone please help? yes, the answer is 5y and yes, y³ + y³ =

*asked on August 15, 2007* -
## Math

A water tank can hold 56 5/7 litres of water. How much water is contained when it is 2/5 full?

*asked on July 26, 2018* -
## physics

A locomotive is running at a constant speed of 100 km/ h. The diameter of driving wheels is 1.8 m. The stroke of the piston of the steam engine cylinder of the locomotive is 600 mm. Find the centripetal acceleration of the crank pin relative to the engine

*asked on December 31, 2014* -
## Ohysics

An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane. a. 1/3 >Vplane b.

*asked on September 19, 2010* -
## Math

A doctor orders a dosage of 5 ml of medicine every 4 hours for 8 days how many fluid ounces of medicine should be purchased Help sole

*asked on April 27, 2018* -
## maths

Prove that in any triangle ABC Sin2A+Sin2B+Sin2C/SinA+SinB+SinC=8Sin(A/2)Sin(B/2)Sin(C/2)

*asked on September 24, 2016* -
## Math

A bus makes 28 stops every 2 hours. How many stops does it make in 3 hours? in 4 hours? How do you get 42 stops; 56 stops? Thanks!

*asked on September 10, 2015* -
## lit

Copán is one of the most impressive sites for ruins of the ancient Maya civilization. Situated in western Honduras, Copán is where the great Maya civilization flourished. Though other Maya ruins have been found in neighboring countries, no other quite

*asked on May 17, 2011* -
## Statistics

The null hypothesis,H0:u=48,was tested against the alternative hypothesis,H1:u>48.A sample of 75 resulted in a calculated p-value of 0.102.if standard deviation=3.5,the value of the sample mean is?need help

*asked on March 23, 2011* -
## Physics

A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what

*asked on February 2, 2011* -
## Language Arts

I need the complete predicate in this sentence? Ida B. Wells was born into slavery in 1862 in Holly Springs, Mississippi.

*asked on September 9, 2010* -
## english

Which of the sentences below is an excerpt taken from "In Another Country" by Ernest Hemingway is an example of irony? A. My knee did not bend and the leg dropped straight from the knee to the ankle without a calf, and the machine was to bend the knee and

*asked on February 21, 2017* -
## science

light that has a frequency of 1.5 x 1015 Hz.

*asked on October 9, 2015* -
## geometry

Write a two-column proof. Given: 7y = 8x – 14; y = 6 Prove: x = 7

*asked on October 12, 2012* -
## Chem

You have a 46.0 G sample of H20 at a temperature of -58.0*C. How many joules of energy are needed to heat the ice to 95.3*C?

*asked on May 14, 2012* -
## English

I really need help with my writing. I need some to proof read a paper that I wrote. Two Career Families versus One Career Families Back in the early days the traditional working family was a one career family. The roles of husband and wife were defined and

*asked on January 28, 2012* -
## Statistics

Of 100 people who were given a vaccine,80 developed immunity to a disease.the 98% interval on the proportion of people developing immunity is?need help

*asked on March 23, 2011* -
## Chemistry

a 23ml H2SO4 solution is titrated by 50 ml 0.10 M NaOH solution, what is the molarity of H2SO4 solution? (Note that H2SO4 is a diprotic acid)

*asked on March 14, 2011* -
## trig

what is the tan of 25 degrees and 01 minute

*asked on April 7, 2010* -
## s.s.

Axum's conversion to Christianity a. beneficial b. a drawback c. first a drawback then beneficial d. first beneficial then a drawback

*asked on February 21, 2010* -
## physics

There's a magic ring in a sealed paint can at the bottom of a frozen pond in the middle of a bog. YOu must get the ring via a plan which: gets you and equipment you need across without sinking, cross the frozen pond without breaking through the ice, lift

*asked on January 19, 2010* -
## precalculus

Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)

*asked on January 12, 2010* -
## math

March 1- $550 rent (check) March 2- $286 tuition (check) March 3- $200 paycheck March 4- 275 bookstore check March 5- $60 withdrawn from ATM March 6- $40 food (debit) March 7- $45 date desert March 8- N/A March 9- $40 gas March 10 - $200 paycheck March 11

*asked on April 19, 2018* -
## math

A cold front moves through your hometown in January, dropping the temperature an average of 3 F per day for 5 days. Write an expression that uses multiplication to describe the changes in temperature from the start to the end. Help solve

*asked on April 19, 2018* -
## Math

The temperature in Minot, North Dakota registered 18 degrees F. The wind chill factor made it feel negative 10 degrees. What is the difference between the actual temperature and the perceived temperature? Help solve

*asked on April 19, 2018* -
## Math

Parmjit has 8 base ten blocks. She has at least one of each type of block. The value of her blocks is between 400 and 600. What blocks could she have? Find the possible answers using an organized list.

*asked on October 13, 2016* -
## Chemistry, due soon please help

calculate the mass of 100 ppm of CO2 int the atmosphere if the atmospheres mass is 5.3x10^18 kg

*asked on December 16, 2013* -
## math problem

The diameter of a circle is increased by enough to increase the circumference by 20%. By what % is the area of the circle increased ? ( Hint: Try a number like t=5.)

*asked on February 17, 2013* -
## Chemistry

You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 379.0 ppm and is initially uniform through the thickness of the

*asked on December 14, 2012* -
## physics

the moon orbits the earth in a circle (near enough) of radious 3.8x10^8 m, taking 27.3 days to make a complete orbit. what is the speed of the moon relative to the earth?

*asked on September 8, 2011* -
## mathsP5

There are 2 packets of flour, Y & Z.The ratio of the mass of Y to Z is 4:1. If 26g is added to Z,the ratio of the mass of Y to Z is 7:5. Find the mass of the 2 packets at first. Pls show how to solve by model method as i have not learnt algebra. tks

*asked on August 20, 2011* -
## lit

What did the philosopher Aristotle mean when he said, "To perceive is to suffer"? Did I punctuate correctly?

*asked on May 10, 2011* -
## lit

My mom says "Never wear anything but a suit to a funeral or a wedding." is this correct punctuation?

*asked on May 10, 2011* -
## lit

Ms. Sardelis said we must "absolutely and without delay" turn in our permission slips by tomorrow or we can't go on the class trip. is this correct

*asked on May 10, 2011* -
## Lit class

I'm going to be asking for the help for all of us does this have correct punctuation? two of us said no and the other two says yes My mom says "Never wear anything but a suit to a funeral or a wedding."

*asked on May 10, 2011* -
## algebra

Select the set of equations that represents the following situation: Mary invested one amount at 7% simple interest, and a second amount at 5% interest, earning $29.80 in one year. If she had switched the amounts, she would have earned $35.00. What were

*asked on February 22, 2011* -
## Physics

A Force,F=10N,applied at an angle of 37 degree above the horizontal,moves a crate a distance of 5m along a rough horizontal surface.A frictional force of 5N opposes the motion.what is the change in kinetic energy?

*asked on February 18, 2011* -
## Math

Two sides of a triangle have the same length. The third side measures 4 meters less than twice the common length . The perimeter of the triangle is 16 meters. What are the lengths of the three sides?

*asked on November 7, 2010* -
## Science

"Describe the role of gravity as the force that governs the movement of the solar system and the universe." I don't get it.

*asked on September 27, 2010* -
## Physics

A lightning bug flies at a velocity of 0.25m/s due east toward another lightning bug seen off in the distance. A light breeze blows from the east on the bug at a velocity of 0.25m/s. What is the resultant velocity of the lightning bug? Please direct me to

*asked on September 15, 2010*