# JJ

Popular questions and responses by JJ-
## MATH

the numerator of a fraction is one-half the denominator! If the numerator is is increased by 2 and denominator is decreased by 2, the value of the fraction is 2/3. What is the numerator of the original fraction?

*asked on August 25, 2013* -
## Physics

A 10-kg piece of aluminum (which has a specific heat of 900 J/kg×°C) is warmed so that its temperature increases by 5.0 C°. How much heat was transferred into it?

*asked on December 19, 2010* -
## precalc

The point (3, -4) is on the terminal side of an angle(theta) . What is cos(theta)

*asked on February 16, 2016* -
## Statistic

I’m having problems creating the flow chart, so I am unable to insert the numbers. This is what I have done this far, and I’m not sure if I’m accurate with the calculations. (1) A school cafeteria is operated by five persons performing the activities

*asked on October 6, 2012* -
## Calculus

The length of a rectangle is increasing at a rate of 9 cm/s and its width is increasing at a rate of 7 cm/s. When the length is 15 cm and the width is 10 cm, how fast is the area of the rectangle increasing?

*asked on November 9, 2010* -
## math

What is the value of 14 – a2 given a = –3?

*asked on September 12, 2017* -
## Language arts

. This question asks about your work in your reading role. You may use your novel to help you answer the question. Think about the work you completed in your reading role. Determine the ideas that would be most worthy to share in a literary discussion

*asked on June 6, 2016* -
## Chemistry. Please help!!

Calculate the final temperature when a 18.7 gram sample of ice at 0 degrees C is placed into a styrofoam cup containing 113 grams of water at 71.6 degrees C. Assume that there is no loss or gain of heat from the surroundings. Heat of fusion of ice = 333

*asked on March 2, 2012* -
## math

Evaluate (5+5√3i)^7 using DeMoivre’s theorem. Write your answer in rectangular form. Show all your work.

*asked on May 19, 2020* -
## math

The heights of the five starters of a college basketball team are 6'6, 6'7, 6'9, 6'11 and 7'. What it the mean height of these players , in inches?

*asked on August 25, 2013* -
## akgebra

One pipe can fill a tank in 20 minutes, while another takes 30 minutes to fill the same tank. How long would it take the two pipes together to fill the tank?

*asked on April 24, 2013* -
## Business Math

What are the proceeds of a note for $5,500 at a discount rate of 8%, for 30 months?

*asked on November 3, 2013* -
## chm

Why are the atomic masses listed in the periodic table not whole numbers? Answer Scientists have yet to make the precise measurements. That would be too much of a coincidence. ??>>The atomic masses are average atomic masses. or >>Today's instruments are

*asked on February 23, 2013* -
## Business Math

Find the amount of the principal on a loan at 6% interest for 274 days if the interest was $68.50, using the ordinary interest method. (Round to the nearest whole dollar amount)

*asked on November 3, 2013* -
## chemisty

Find the volume of a starburst candy (220 cm cubed). The mass is 5.14 grams. Calculate it's density. How many starburst would it take to fill your locker (139,200 cm cubed)? Use dimensional analysis to solve this problem.

*asked on September 8, 2013* -
## chemistry

calculate how many mL of 6M HCL are needed to prepare 100mL HCL solution with a concentration of ~1M?

*asked on October 10, 2011* -
## Algebra 2

Complex numbers are written in the form a + bi. What does i represent? -1 0 1 sqrt-1 **my choice

*asked on November 30, 2016* -
## physics

A particle of mass 7.7 × 10-8 kg and charge +11 μC is traveling due east. It enters perpendicularly a magnetic field whose magnitude is 4.2 T. After entering the field, the particle completes one-half of a circle and exits the field traveling due west.

*asked on October 12, 2014* -
## chemistry

How many moles of chloroethylene contain 5.47×10^26 molecules?

*asked on April 22, 2011* -
## General

Are their any search engines I can use besides bing and google? Any places I can access historical journals? Thanks!

*asked on March 29, 2011* -
## 10th grade

BC=3x+2 and CD= 5x-10. Solve for x.

*asked on October 30, 2010* -
## Trigonometry

How could you evaluate tan (13pi/12) if you did not know the sum and difference formula for tangent? Would you use the sin and cos sum and difference formulas, and if so, can someone walk me through it? Thank you!!!

*asked on April 3, 2020* -
## Math

On which interval is log(5 – x) negative?

*asked on October 1, 2019* -
## Math

which polynomial does the model represent (Model shows: 1 big black square, 2 long blank rectangles, 3 long rectangles, 3 small blank squares, 1 small blank square) a.) -x^3+2x^2-3x+2 b.)x^2+x-2 c.)-x^2-x+2 d.)-x^2+x-2

*asked on May 10, 2016* -
## Science test review

Here are all the word you can use I need help chemical property mixture heat capasity homogeneous viscosity sublimitation physical property compound chemical formula substance density mass tempurature pressure heterogenerous 14. A property of matter

*asked on May 2, 2016* -
## Physics

Two passenger trains are passing each other on adjacent tracks. Train A is moving east with a speed of 35.5 m/s, and train B is traveling west with a speed of 33.4 m/s. (a) What is the velocity (taking due east to be the positive direction) of train A as

*asked on September 11, 2015* -
## Statistics of Psychology

Create a numerical and verbal hypothesis statement: People who are cyber bullied have, for the most part, been bullied in more traditional manners as well." Their research showed that the incidence increased over time, with 23 cases (56%) taking place

*asked on December 9, 2012* -
## math question

How do you write 1/2 as a percent?

*asked on November 13, 2012* -
## Calculus. please helppp!!

1) Two cars travel in the same direction along a straight road. The figure below shows the velocity, V, of each car at time t. Car B starts 3 hours after car A and car B reaches a maximum velocity of 40 km/hr. a. For approximately how long does each car

*asked on March 13, 2012* -
## physics

You are trying to ﬁnd out how high you have to pitch a water balloon in order for it to burst when it hits the ground. You discover that the balloon bursts when you have pitched it to a height of 14 m. With what velocity did the balloon hit the ground?

*asked on October 2, 2011* -
## Math

Sheila's age is two years more than twice Nicole's age. The sum of their ages is the same as Steven's age. If Steven's age is ten years less than five times Nicole's age, ,find the age of each. Write a verbal model!

*asked on October 6, 2010* -
## Maths

P varies partly as q and partly as the square of r. When p=6,q=8 r=4 and when p=10,q=12 and r=5. find the formula connecting p,q and r

*asked on February 8, 2020* -
## Math

Find the digit that makes blank 2440 divisible by 9 test help im behind allot help.

*asked on October 11, 2017* -
## chemistry

if 3.15g of mercury are thermally decomposed to mercury and oxygen what mass of mercury will be produced and how many oxygen molecules will be produced [hg=208,o=16]

*asked on December 30, 2016* -
## Social studies connexus 8th grade

The Underground Railroad used escape routes that went throughout the South. Based on that fact, which of the following conclusions could be made? I could use some help here can anyone help me give me an answer or a link of some sort? Thanks

*asked on November 15, 2016* -
## Math

determine whether the graphs of the following equations are parallel or perpendicular y=2/3x + 3, y=3/2x, 2x-3y=8

*asked on November 12, 2016* -
## language arts

Joe magarac, Man of steel 8. In section 1, what does the author mean when he says joe magarac is a folk hero? A. Joe was a real man who spent his whole life in the steel mills of Pittsburgh. B. Joe was a mysterious figure who vanished without a trace.* C.

*asked on June 2, 2016* -
## History

Which group creates the largest land empire in the 12th and 13th century? Chinese Mongols Muslims Russians I say, Muslims. Is this correct??

*asked on October 30, 2013* -
## math

Jim has 1/3 as many goldfish as Hannah. Hannah has 5 times as many goldfish as Ping. If Ping has 15 goldfish, how many goldfish does Jim have?

*asked on August 26, 2013* -
## math

In the xy-plane, lines a and b intersect at point (5,-2), and lines b and c intersect at point (-3,3). What is the slope of line b? Express your answer as a common fraction

*asked on August 25, 2013* -
## science

a boat weights 10,000 newtons what is the magnitude of buoyant force acting on boat in the fliud

*asked on April 28, 2013* -
## algebra

An object that is projected straight downward with initial velocity v feet per second travels a distance s vt 16t 2 =+ , where t =time in seconds. If Ramón is standing on a balcony 84 feet above the ground and throws a penny straight down with an initial

*asked on April 24, 2013* -
## chm

Which of the following is a covalent compound composed of nonpolar covalent bonds? Answer >>H2 H2O CF4 CH4 NaF

*asked on February 26, 2013* -
## calculus

1.) values of f(t) are given in the following table: t 0 2 4 6 8 10 f(t) 137 112 88 68 49 34 a. Does this function appear to have a positive or negative first derivative? Second derivative? * I think both derivatives are negative b. Estimate (f prime) f^'

*asked on February 22, 2012* -
## chem

In an equilibrium mixture of HCl, Cl2 and H2, the partial pressure of H2 is 4.2 mPa and that of Cl2 is 8.3 mPa. What is the partial pressure of HCl at 500 oK given that at that temperature Kp = 4.0 x 1018 for H2(g)+ Cl2(g)--> 2HCl(g)

*asked on May 31, 2011* -
## cal

Differentiate the function. f(x) = sin(7 ln x)

*asked on November 9, 2010* -
## PreCalc

The decibel (dB) is defined as dB= 10log (P2/P1), where P2 is the power of a particular signal. P1 is the power of some reference signal. In the case of sounds, the reference signal is a sound level that is just barely audible.How many dBs does a sound

*asked on October 9, 2010* -
## Calculus

A sign 3 feet high is placed on a wall with its base 2 feet above the eye level of a woman attempting to read it. How far from the wall should she stand to get the best view of the sign, that is, so that the angle subtended at the woman’s eye by the sign

*asked on July 11, 2010* -
## physics

A chair of weight 150 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 36.0 directed at an angle of 40.0 below the horizontal and the chair slides along the floor.Using Newton's laws, calculate , the

*asked on December 14, 2009* -
## essay

I have to write an essay about one of the social problems during the Industrial Revolution according to the book call "Frankenstein". I don't know which topic should I choose that have enough evidence from the book to write a 7pgs essay. This will talk

*asked on December 10, 2006* -
## p.e.

without this system in your body you would really get sick because toxins and wastes would build up. 1. cardiovascular 2. excretory 3. intugumentary **** 4. muscular

*asked on November 27, 2017* -
## physics

Explain in a few words why, when operating a garden hose fitted with a trigger-operated nozzle, the water jet is momentarily more powerful at the instant the trigger is squeezed than later, when there is a continuous stream of water. Show that the amount

*asked on March 13, 2017* -
## Physics

A girl tried to overthrow gender stereotypes by kicking her stuffed animal across a park with an initial velocity of 25m/s, making an angle of 45 degrees with the horizontal. Upon reaching maximum height, her cat jumped and propelled it further

*asked on October 17, 2016* -
## environmental science

the warming of the oceans causing less carbon dioxide to be soluble in them, and at the same time leaving more carbon dioxide in the atmosphere causing an increased warming of the atmosphere, is a example of a a. model of a system showing a paradigm shift.

*asked on October 12, 2016* -
## 2nd grade math

Show how to make one addend the next tens number. Complete the new addition sentence 26+27=? Is it 53 (10+43=53)

*asked on October 4, 2016* -
## career

Matching these ones I really don't have a clue so if you could help here it would be nice but if not I understand Match the following terms with their definitions. A. using the connections among people to help one another reach important goals B. personal

*asked on May 17, 2016* -
## Math

Write and simplify the polynomial represented by the model. (Model shows: 3 big blank squares, 2 long black rectangles, 3 small blank squares, 1 big black square, 6 small black squares) a. -2x^2 + 2x + 3 b. 2x^2 - 2x - 3 c. 3x^2 - 2x - 3 d. 2x^2 - 2x + 3

*asked on May 10, 2016* -
## Math

find p so that the numbers 7p+2, 5p+12, 2p-1...... form an arithmetic sequence

*asked on January 29, 2016* -
## math

If r = 7 m then d = what c = what

*asked on March 1, 2015* -
## MATH

Suzanna needs a board that is at 3.5 meters long. is the board long enough Explain

*asked on December 14, 2014* -
## algebra

Suppose y varies directly with x. Write an equation relating x and y. 645-09-05-00-00_files/i0130000.jpg a. y = 6x c. y = 7x b. y = x d. y = − x

*asked on November 6, 2014* -
## pyhsics

A man drops a rock off the side of a cliff, and hears it hit the bottom 2.8 seconds later. If the average speed of sound is 335 m/s, how high is the cliff? I have been able to figure out this much, but I don't know how to solve the problem with the data

*asked on October 24, 2014* -
## Chemistry

A piston is holding 125 mL of gases at a temperature of 300 K and a pressure of 2.39 atm. What is the volume of the gases if the temperature is increased to 500K and the pressure falls to 2.15 atm?

*asked on February 15, 2014* -
## Statistics

A national opinion poll found that 44% of all American adults agree that parents should be given vouchers good for education at any public or private school of their choice. Suppose that in fact the population proportion who feel this way is p=0.44. A)

*asked on December 17, 2013* -
## History

What are three heirs of ROme after the fall of the Western Empire? I think I know two, which are...Byzantine and Islamic. But what is the last one?? or is my two answer right??

*asked on October 29, 2013* -
## History

When was the height of Egyptians, Athenians, Alexander's empire, and Roman Empire? I am having hard time finding the exact or round about year to these. I've found two so far, but I am sure if its right. please help so i can study for my test! thank you!

*asked on October 1, 2013* -
## quantum physics

!@#$%^& 6 q6:Now, consider the case where N4 elements are marked instead of just one. If we run one iteration of Grover's algorithm and measure, what is the probability that we see a marked element? q7: Which of the following observables correspond to a

*asked on September 28, 2013* -
## Math

A state creates license plates that each contain two letters followed by three digits. The first letter must be a vowel and duplicate letters and digits are allowed. How many different plates are possible?

*asked on August 20, 2013* -
## Chemistry

A 1.065-g sample of an unknown substance is dissolved in 30.00 g of benzene; the freezing point of the solution is 4.25 degrees C. The compound is 50.69% C, 4.23% H, and 45.08% O by mass. Info you might need on benzene: Normal Freezing point,degrees C:

*asked on February 25, 2013* -
## chm

How would you classify the following material?swimming pool water homogeneous mixture

*asked on February 23, 2013* -
## english

can divining be replaced by doubting or realizing

*asked on February 14, 2013* -
## englsih

we saw nelson (skating in the park) the parenthesis is it idependent clause gerund phrase or adverb clause or noun clause

*asked on February 13, 2013* -
## Math

Marshal sleeps 8 hours each day how many hours does Marshal sleep in one week

*asked on February 12, 2013* -
## english

how do u find a subject for writng instuctions for using a tool

*asked on February 12, 2013* -
## ENGLISH, HELP?

In the following sentence, which words should be in quotation marks? Did you read the chapter Chemical Reactions in our science textbook, Understanding Chemistry? A. chapter Chemical Reactions B. Chemical Reactions C. Understanding Chemistry I think the

*asked on February 1, 2013* -
## Chemistry

An structural isomer of bromobutane (C4H9Br) can be hydrolysed using aqueous sodium hydroxide to produce butanol. This can be represented by the following equation: C4H9Br(l) + OH-(aq) C4H9OH(l) + Br-(aq) This reaction was investigated experimentally

*asked on April 5, 2012* -
## Economics

The index most widely used by the government and the private sector to measure changes in the cost of living is the (a) the GDP deflator, (b) Producer Price Index, (c) The interest rate, (d) Consumer Price Index

*asked on November 9, 2011* -
## problem solving

The greatest common factor of two nubers is one. What do you know about the numbers.

*asked on October 19, 2011* -
## cal

If a ball is thrown into the air with a velocity of 41 ft/s, its height (in feet) after t seconds is given by y = 41t − 16t^2. Find the velocity when t = 1.

*asked on October 18, 2011* -
## Maths

Hi! I need help. I have worked out total rainfall, I have the monthly average (given by beauro) and I worked out the mean rainfall each month. My teacher says I need to work out the amount of rainfall in m-cubed that would fall on the roof each month. How

*asked on March 31, 2011* -
## Physical Science

A 15 Kg object that is free falling has a total mechanical energy of 13,230 Joules. (A) From what height was the object dropped? (B) What is the velocity of the object when it hits the ground? (C) How long does the object fall?

*asked on January 8, 2011* -
## Physics

A heat engine exhausts 3 000 J of heat while performing 1 500 J of useful work. What is the efficiency of the engine?

*asked on December 19, 2010* -
## Algebra

Kevin has $6.45 in coins in his cash box. The numbers of quarters is one less than twice the number of dimes. The number of nickels is one less than twice the number of quarters. The value of the pennies is the same as the value of the nickels. How many of

*asked on December 14, 2010* -
## PHYSICS

Indentify the direction of the netforce in each of the following situations. A marble moves in a circular path inside a paper plate at a constant speed. The moon orbits the earth. An air hockey puck moves smoothly across the air hockey table after being

*asked on November 19, 2010* -
## Please Algebra 1

Roberta sold fifty tickets for the school play. Roberta sold ten more student tickets than adult tickets. How many student tickets did Roberta sell? From this result, if the total cost of a student ticket was three-fourths the cost of an adult ticket, and

*asked on October 17, 2010* -
## Physics

a basketball player is trying to make a half-court ump shot and releases the ball at the height of the basket. assuming that the ball is launched at 51 degrees, 14 m from the basket, what speed must the player give the ball?

*asked on April 18, 2010* -
## Art history

Can you tell me if these sculptures have open or closed contour? I can't post the link but if you search the name and the numbers it should show up. Sculpture 1: Mother and Child [1979.206.121] Sculpture 2: Virgin and Child [33.23]

*asked on February 3, 2010* -
## History

How did human history in North America during the period described in the Prologue differ from the events of Asia, Eurasia,

*asked on November 6, 2009* -
## Geometry

If rectangle ABCD has a larger area than rectangle EFGH, does it follow that ABCD must have a perimeter larger than that of EFGH? Why or why not.

*asked on October 20, 2009* -
## Geometry

The length of a median of a triangle is 36 units. How many units from the vertex is the median?

*asked on October 7, 2009* -
## math

find counterexample the quotient of two proper fractions is a proper fraction

*asked on August 18, 2009* -
## PHYSICS

Referring to the diagram, if c = 32 and theta is equal to 57.6 degrees, find the difference in the length of sides a and b. Another words determine the length of side a, determine the length of side b, and then subtract b from a (a - b). (For example if a

*asked on August 26, 2011* -
## Calculus

related rates: a ladder, 12 feet long, is leaning against a wall. if the foot of the ladder slides away from the wall along level ground,what is the rate of change of the top of the ladder with respect to the distance of the foot of the ladder from the

*asked on January 9, 2008* -
## French

my teacher marked these phrases as wrong but i don't know what about them is wrong: 1. je revelerais sans prevenir 2. j'ai vendu mes robes plus jolies both of them need "un mot a ajouter"

*asked on October 10, 2007* -
## science

What are two chemical and two physical properties of water? Please help me. Thank you. physical properties: boiling point, freezing point,density, color, electrical conductivity chemical properties: reactivity with sodium. Reactivity and decomposition with

*asked on June 10, 2007* -
## Physics

for our lab, we had to fill a semi-circle plastic dish (with a scratch on one side) with water and find the index of refraction of water by putting a pin on one side of the dish, looking through the water, and put a pin on the other side of the dish to

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

What number is less than10^-8? a)0.000001 b)0.0000001 c)0.00000001 d0.0000000001 10^(-8) = 0.00000001 figure it out from there. hint: (c) = 10^-8

*asked on February 25, 2007* -
## geography

what is phyiscal region? What is a physical region? A physical region is an area that shares a similar type of landform or physical characteristic. In South Asia, we find three physical regions: The Himalaya Mountains The Indo-Gangetic Plain The Deccan

*asked on November 26, 2006* -
## science

how do jupiter's moons stay in orbit around jupiter They rotate around jupiter. If you rotate around an object you are accelerating toward it, even though the distance can stay the same. This so-called centripetal acceleration multiplied by the mass must

*asked on November 11, 2006* -
## Math

If you receive $1000 for your birthday and decide to invest it in an account earning 8% compound interest, how much will you have in 5 years when you graduate high school? A. $400 B. $1400 C. $1469.32 D. $18,895.68 E. $1327.68

*asked on May 27, 2020*