# help

Popular questions and responses by help-
## world history

Which option most accurately explains the impact of the First Agricultural Revolution? Early humans ate more foods high in protein and low in starch and grains. Early humans created new social cultures, including laws and inventions. Early humans began to

*asked on April 26, 2019* -
## Math

Assume that women’s heights are normally distributed with a mean of 63.6inches and a standard deviation of 2.5inches. If 90 women are randomly selected, find the probability that they have a mean height between 62.9inches and 64.0inches.

*asked on May 15, 2019* -
## Maths

Given that 3^9 + 3^12 + 3^15 + 3^n is a perfect cube number. Calculate the value of n.

*asked on November 12, 2016* -
## Math

An alloy is composed of nickel, zinc, and copper in a ratio of 3:4:13. How many kilograms of each metal are needed to make 4 kg of this alloy?

*asked on May 14, 2017* -
## math

A standard deck of cards has 52 cards divided into 4 suits, each of which has 13 cards. Two of the suits ($\heartsuit$ and $\diamondsuit$, called `hearts' and `diamonds') are red, the other two ($\spadesuit$ and $\clubsuit$, called `spades' and `clubs')

*asked on November 2, 2019* -
## math

There are 5 blue chips, 4 red chips and 3 yellow chips in a bag. One chip is drawn from the bag. That chip is placed back into the bag, and a second chip is drawn. What is the probability that the two selected chips are of different colors? Express your

*asked on November 17, 2019* -
## math

I need help!!!! Write an expression describing all the angles that are coterminal with 127° . (Please use the variable "k" in your answer)

*asked on June 27, 2019* -
## Physics Help Please! Check the answer

an athlete stretches a spring an extra 40.0 cm. how much energy has he transferred to the spring, if the spring constant is 5286.0 N/m? Us= 1/2kx^2 =1/2(5286.0)(.40)=1057.2 J Thanks!

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

1) Which group made up the majority of white Southerners? Planters capitalists middle class small farmers 2. Which is the most likely cause of the spike in cotton production in Mississippi in the mid¬ 1800s shown on the chart? the growth in demand for

*asked on November 16, 2016* -
## physics

a 3.5 kg block is accelerated from rest by a compressed spring of spring constant 640 N/m. The block leaves the spring at the springs relaxation length.The block then travels over a horizontal floor with coefficient of kinetic friction 0.25. The friction

*asked on November 23, 2010* -
## MATHS

A boy spent 1/4 of his money on sweets and 3/8 on bus fares. What fraction of his money is left?

*asked on November 2, 2014* -
## Social Studies

Which pull factor would most likely encourage an immigrant who wanted to raise and sell cattle in the United States A. industrial jobs B. inexpensive land C. the promise of freedom D. expensive land in home country I think it's B If anyone had all the

*asked on April 18, 2018* -
## Physics!!!

A 24-V battery is connected in series with a resistor and an inductor, with R = 5.6 Ω and L = 2.0 H, respectively. (a) Find the energy stored in the inductor when the current reaches its maximum value. (b) Find the energy stored in the inductor one time

*asked on February 27, 2012* -
## Math

Given the box plot, will the mean or the median provide a better description of the center? box plot with min at 6, Q1 at 7.5, median at 8, Q3 at 23, max at 32.5 The mean, because the data distribution is symmetrical The median, because the data

*asked on May 1, 2016* -
## math

Assume these facts: i. A course grade is either 0 or a decimal number between 0.7 and 4.0. ii. A course percentage of p = 96 gives a grade of 4.0 and a course percentage of p = 43 gives a grade of 0.7. Between these two percentages, the grade is given by a

*asked on July 14, 2020* -
## math

Boris and Stella are running on a circular track which has a radius of 300 meters. They start running at the same time. Boris starts at the northernmost point of the track, and Stella starts at the easternmost point. Boris runs clockwise. Stella runs

*asked on July 30, 2020* -
## calculus

find the function that is finally graphed after the following transformations are applied to the graph of y=square root x in the order listed. a. reflected about the y-axis b. shift down 3 units c. shifht left 9 units please show work

*asked on December 13, 2012* -
## math

Find the equation of the line that passes through the point (-√3, -1), and makes an angle of 30 degrees with the line y = 1.

*asked on July 23, 2020* -
## Trig

Use the half-angle formulas to come up with an exact expression for each function value below. You do not have to simplify your answers. cos(pi/16)

*asked on April 1, 2012* -
## World History

How did the Industrial Revolution introduce justifications for imperialism? (Select all that apply.) Industrialized nations sought to bring technological knowledge to Africa and Asia. Industrialized nations sought colonies to deport people who would work

*asked on March 19, 2019* -
## math

If the graph of the quadratic function f(x) = x^2 + dx + 3d has its vertex on the x-axis, what are the possible values of d? What if f(x) = x^2 + 3dx − d^2 + 1?

*asked on July 16, 2020* -
## math

1,5,11,19 (a) calculate next two patterns (b) calculate the nth term of the pattern (c)which term of the pattern is equal to 2549. thanks a lot

*asked on June 3, 2015* -
## Math

What is the equation of the line shown on the graph? A graph is shown in the xy-plane. The x-axis is labeled as Number of Target Hits and the y-axis is labeled as Number of Points Scored. The values on the x-axis range from 0 to 18 in increments of 2 and

*asked on September 25, 2019* -
## mathematics

The length of a rectangle is represented by 2x + 3 and the width by 2x -1. Find the perimeter as a polynomial in simplest form.

*asked on August 6, 2020* -
## mathematics

Which best describes the expression (v +� 6)(v - 6) when simplified? a.monomial b.binomial c.trinomial d.constant

*asked on August 6, 2020* -
## math

Let f(x) = x + |2x − 1|. Find all solutions to the equation f(x) = 8

*asked on July 14, 2020* -
## Physics

A 2473 kg elephant is walking at 3 m/s on a flat surface. How much kinetic energy does he have? Answer in Joules

*asked on February 17, 2014* -
## science

Which option correctly defines a generator? A.a device that converts mechanical energy into electrical energy B.a device that converts electrical energy into mechanical energy C.a device that converts light energy into electrical energy D.a device that

*asked on May 4, 2020* -
## World History

Which Industrial Revolution inventor improved upon the Newcomen steam engine? James Watt Eli Whitney James Hargraves Elias Howe I think its James HArgraves

*asked on April 26, 2019* -
## math

Which point is located at (– 3 , – 2)?

*asked on October 19, 2017* -
## Chemistry

Tube worms that survive near geothermal vents of hydrogen sulfide rely on bacteria living inside them to obtain energy by the oxidation of H2S to SO4^2-. What is the overall change in the oxidation number of sulfur for this reaction?

*asked on June 26, 2012* -
## Chemistry

Knowing that delta Hvap for water is 40.7 kJ/mol, calculate Pvap of water at 46 C

*asked on January 23, 2012* -
## Algebra

A size 36 shoe in France is size 3.5 in England. A function that converts shoe sizes in France to those in England is g(x)= 3x-94/4. A size 6 shoe in the United States is size 3.5 in England. A function that converts shoe sizes in England to those in the

*asked on September 12, 2010* -
## English 10 ASAP

Determining the author's purpose in a text relies on (10 points) biographical information research the author used evidence in the text

*asked on June 28, 2018* -
## Physics

How fast (in rpm) must a centrifuge rotate if a particle 69-cm from the axis of rotation is to experience an acceleration of 200438 g's? (can you show me how you get the answer) be thorough

*asked on September 18, 2017* -
## english

13. Which of the following sentences contains a comma splice? A. Our friend, who travelled from Tennessee, was quite tired when he arrived. B. We need help with organization, structure, and spelling. **C. The pots clanged to the kitchen floor, the kitten

*asked on March 14, 2016* -
## physics

Two workhorses tow a barge along a straight canal. Each horse exerts a constant force of magnitude F, and the tow ropes make an angle θ with the direction of motion of the horses and the barge. (Figure 1) Each horse is traveling at a constant speed v. How

*asked on October 24, 2013* -
## chemistry

A 32.2 g iron rod, initially at 22.3 C, is submerged into an unknown mass of water at 63.9 C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 58.6 C. What is the mass of the water?

*asked on March 19, 2012* -
## math

Orlando has a bank statement balance of $414.25 and $5.90 service charge. His check register shows $374.16 and he has two outstanding checks of $26.54 and $21.78. What is his true balance?

*asked on January 25, 2012* -
## physics

Cars A and B are racing each other along a straight path in following manner: Car A has head start and is a distance dA beyond starting line at t=0. The starting line is at x=o. Car A travels at constant speed vA. Car B starts at starting line but has

*asked on September 27, 2009* -
## Ap Calculus

Find the area of the region bounded by the graphs of y=x, y=-x+6, and y=0

*asked on January 30, 2019* -
## Algebra 1

The weight needed to balance a lever varies inversely with the distance from the fulcrum to the weight. A 120-lb weight is placed on a lever, 5 ft from the fulcrum. What amount of weight, in pounds, should be placed 8 ft from the fulcrum to balance the

*asked on May 2, 2018* -
## Social Studies

What did Alexis de Tocqueville observe on his visit to the United States that reflected changes that were happening in the country during Jackson's administration? (1 point) a strict divide between rich and poor a growing spirit of democracy and equality

*asked on November 28, 2017* -
## Math

the 64 people who answered "yes" to a question, 6 were male. Of the 70 people that answered "no" to the question, 8 were male. If one person is selected at random from the group, what is the probability that the person answered "yes" or was male?

*asked on April 11, 2016* -
## Communication

1.) Song Xue, a Chinese exchange student, tells his mother during a telephone conversation that he is enjoying his time in America but Americans are loud. What element of forming supportive messages has Song Xue forgotten? A.) ask questions B.) demonstrate

*asked on September 29, 2019* -
## Math

Use the formula v=lwh to find the volume of a rectangular prism with following dimensions length=7 in. width=4 in. height =3 in.

*asked on March 18, 2019* -
## math

Fair Race Portfolio Template: Functions Instructions: Follow the instructions provided in the lesson. Use this template to record your work and answers. Please submit this template to the dropbox along with any other evidence you would like to provide for

*asked on February 17, 2017* -
## World history

9. What evidence best supports the influence of the Moche culture on the Inca empire? A. the creation of the geoglyphs B. the existence of the road networks C. the extensive nature of Incan trade D. the worship of a sun god

*asked on February 9, 2017* -
## Art

1. An artist places a notebook and pen in the gallery of his latest exhibition and asks viewers to leave comments about his work. He is trying to help audience members become what type of observers? A. Active Observers*** B. Reluctant Observers C. Passive

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

Please help Suppose that 0.250mol of methane, CH4(g), is reacted with 0.400mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance ΔH∘f (kJ/mol) C(g)

*asked on October 23, 2014* -
## math

Let C = 2.32 N + 34180 represent the cost (C) of raising a child to 18 years of age, on an income (N). If the cost is $120,000, what is the income?(

*asked on January 23, 2012* -
## 11th grade physics

the horizontal range of a projectile is 4 root 3 times of its maximum height. calculate the angle of projection.

*asked on November 8, 2010* -
## math

Find the coordinates of the midpoint of the segment whose endpoints are H(5, 13) and K(7, 5).

*asked on May 9, 2020* -
## Physics

5. Salim has a paper route. In the winter time, he puts his newspapers on a toboggan to pull them through the snow. The combined mass of the papers and the toboggan is 24 kg. The coefficient of static friction between the toboggan and the snow is 0.18. The

*asked on April 16, 2020* -
## English

1. Choose the answer that best matches the word in italics. Use context clues to determine the meaning of the word, if necessary. The decorations were reminiscent of autumn leaves. (1 point) leftovers made reminders symbolic 2. Choose the answer that best

*asked on October 4, 2018* -
## Social Studies

1. What negative impact did gold and silver mining have in the west? I think it would be Ghost towns were left behind after the mines stopped producing. Is this right?

*asked on January 9, 2018* -
## Heath

1. Which digestive organ is the last organ food passes through before reaching your stomach? (1 point) pharynx epiglottis esophagus mouth 2. Starches and sugars belong to which class of nutrients? (1 point) carbohydrates fats proteins enzymes 3. A method

*asked on November 11, 2016* -
## Mechanical behavior

An atomic force microscope cantilever, of rectangular cross section, has a length, l, of 200μm, a width, b, of 20μm and a depth, h, of 1μm. It is made of silicon nitride, which has a Young's modulus, E, of 300GPa. What is the maximum force that can be

*asked on November 8, 2015* -
## Chemistry

Suppose that 0.250mol of methane, CH4(g), is reacted with 0.400mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance ΔH∘f (kJ/mol) C(g) 718.4

*asked on October 23, 2014* -
## physics

You are a member of an alpine rescue team and must get a box of supplies, with mass 3.00kg , up an incline of constant slope angle 30.0∘ so that it reaches a stranded skier who is a vertical distance 2.90m above the bottom of the incline. There is some

*asked on October 24, 2013* -
## chemistry

a 5.55g sample of a weak acid with ka=1.3*10^-4 was combined with 5.00ml of 6.00 M NAOH and the resulting solution was diluted to 750mL. The measured pH of the solution was 4.25. what is the molor mass of the weak acid. if used the formula

*asked on November 25, 2010* -
## chemistry

A solution was prepared by dissolving 43.0 of in 225 of water. Calculate the mass percent of in the solution.

*asked on October 1, 2010* -
## math

find the expression for: (f(x+h))-(f(x)))/h given: f(x)=sqrt(x-1) hint:rationalize the numerator simplify far enough that plugging in h = 0 would be allowed

*asked on July 13, 2020* -
## math

find the expression for: (f(x+h))-(f(x)))/h given: f(x)=-pix^2-pi^2 simplify far enough that plugging in h = 0 would be allowed

*asked on July 13, 2020* -
## probability

Tickets numbered from one to 40 are mixed up and one is drawn. What is the probability that number is divisible by 3 or 5? What is the probability that number is divisible by 3 and 5?

*asked on May 16, 2020* -
## Science

A student tried to solve the following problem by selecting the conversion below. What, if anything, did the student do wrong? How many moles of AgNO3 are needed to produce 6.75 moles of copper (II) nitrate Cu(NO3)2 upon reacting with excess copper (Cu)?

*asked on February 26, 2020* -
## math

The stem-and-leaf plot shows the test scores of a science class. Use the plot to answer the question. 1.how many students scored 78? (1 point) 1 student 2 students 3 students 4 students

*asked on May 16, 2018* -
## Math

Which situation can be represented by the expression x plus negative 3? Choose all that apply. A.An elevator went down 3 floors. B.A person spent $3. C.A person added 3 books to the shelf. D.The temperature dropped 3 degrees. My Answers are B and C

*asked on February 13, 2018* -
## Ela

Reread lines 679 - 706. What do the stage directions and dialogue reveal about Mr. Frank

*asked on October 18, 2016* -
## DYNAMICS

A car has an initial speed of 25m/s and a constant deceleration of 3m/s^2. Determine thewvelocity of the car when t=4s. What is the displacement of the car during the 4-s time interval? How much time is needed to stop the car?

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

* A 50 gram sample of an unknown metal warms from 18 to 58 after absorbing 800 joules of energy. what is the specific heat of the metal? *copper has a specific heat of 0.387 j/g degree celsius. what is the mass of a piece of copper that undergoes a 21.0 C

*asked on December 11, 2012* -
## CHEMISTRY

The standard electrode potential for the reduction of Eu3+(aq) to Eu2+(aq) is −0.43 V. determine which of the following is capable of reducing Eu3+(aq) to Eu2+(aq) under standard-state conditions? (a) Sn2+(aq) (b) ln(s) (c) HCN(aq) (d) La(s)

*asked on November 30, 2012* -
## Physics

Analyze the collision of a baseball with a bat. During which portion of the collision does the baseball’s velocity reach zero? a. before the collision b. during the collision c. one second after the collision d. one-hundredth of a second after the

*asked on December 9, 2011* -
## math

Find the rules for (f∘g)(x) and (g∘f)(x) and give the domain of each composite function. f(x) = x^2 g(x) = √(1-x) The Domain of (f∘g)(x) is : (f∘g)(x) = The Domain of (g∘f)(x) is : (g∘f)(x) =

*asked on May 23, 2020* -
## Math

Roni wants to write an equation to represent a proportional relationship that has a constant of proportionality equal to StartFraction 7 over 25 EndFraction. She writes the equation y = x + StartFraction 7 over 25 EndFraction. What error is Roni making? A:

*asked on February 6, 2020* -
## SS

Which of the following statements best describes the spread of Islam during the Arab conquests? A. Islam spread only within the lands conquered by Arabs. B. Everyone in conquered lands was forced to convert to Islam. === C. Few non-Arabs ever converted to

*asked on October 2, 2018* -
## Spanish

PLEASE HELP ME! Will make as brainliest! Much appreciated. 1. A celebration in the countryside in which family and friends get together in Cuba is known as a _______. (1 point) Habana Vieja guateque campesino trovadores cocotaxi 2. La Habana Vieja's annual

*asked on September 19, 2018* -
## college physics

FM radio waves have frequencies between 80.3 and 108 MHz. Determine the range of wavelengths for these waves.

*asked on March 23, 2018* -
## math

use the distance formula to find the distance between the points (-3,8) and (-4,-1) round to the nearest hundredth if neccesary

*asked on February 2, 2017* -
## Algebra

Please check all of my answers and tell me if they are right. 1. What is the simplified form of the following expression? 7m^2 + 6.5n – 4n + 2.5m^2 – n (1 point) A. 9.5m^2 + 1.5n*** B. 4.5m^2 + 1.5n C. 1.5m^2 – 4.2n D. 9.5m^2 – 1.5n 2. Simplify the

*asked on October 9, 2016* -
## Language Arts

"Phoebe turned to me with a puzzled expression on her face. I think that she was surprised at what she said but I new exactly why she lied. It was easier sometimes. " Which type of conflict best characterizes the events in the passage? ^^ -character vs.

*asked on June 8, 2016* -
## math

3a - 4 less than or equal to 5

*asked on November 10, 2015* -
## MATH

I NEED HELP -5g - 6 for g= -2 4 16 10 -13 write an algebraic expression for the sum of 3 coins and c coins c+3 c/3 3c c-3 what value of x is a solution to the equation x-2=16 14 18 21 12 z/-12=-5 7 -60 -17 60 estimate the solition of the equation x-8.1=5.3

*asked on October 20, 2015* -
## English

Select the letter of the pair of words that expresses a relationship expressed by the following pair 1.Stethoscope:doctor a.manager: trainee b.best-seller: publisher c.tool:shovel d.microphone:broadcaster 2.cubism:art a.dictatorship:government b.suit:vest

*asked on December 6, 2013* -
## math

A textbook store sold a combined total of 315 physics and chemistry textbooks in a week. The number of physics textbooks sold was two times the number of chemistry textbooks sold. How many textbooks of each type were sold?

*asked on March 7, 2013* -
## Math grade 7

The number 7 is a factor of 1001. explain how you know 1001 is a multiple of 7? How does knowing that 7 is a factor of 1001 help you to get another factor of 1001?

*asked on September 10, 2012* -
## Physics

A rocket leaves a launch pad at liftoff with a great deal of upward momentum. What was initially given downward momentum? a. the launch pad b. the astronauts aboard the rocket c. the expelled fuel d. the entire Earth

*asked on December 9, 2011* -
## Algebra II

A projectile is thrown upward so that its distance above the ground after t sec is given by h(t)=-11t²+264t. After how many seconds does it reach its maximum height?

*asked on July 3, 2011* -
## physics

The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period? physics - bobpursley,

*asked on February 3, 2011* -
## Algebra

find the measure of an angle whose supplement measures two times its measure

*asked on January 22, 2011* -
## Biochemistry

What is the net ionic equation for Phosphate ion + ammonium molybdate in the presence of nitric acid?

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

Why are titrations using permanganate performed in acid solution?

*asked on April 28, 2010* -
## physics

The position of a particle moving along an x axis is given by x = 15t2 - 2.0t3, where x is in meters and t is in seconds. (a) Determine the position, velocity, and acceleration of the particle at t = 3.0 s. x = m v = m/s a = m/s2 (b) What is the maximum

*asked on December 14, 2008* -
## math

Factor: 81a^2+5b^2

*asked on May 30, 2020* -
## math

Joe wants to put a fence around his rectangular garden. His garden measures 33 ft by 39 ft. The garden has a path around it that is 3 ft wide. How much fencing material does Joe need to enclose the garden and path?

*asked on May 5, 2020* -
## math

Find the length of the segment ¯¯¯¯¯¯¯¯ M N with endpoint M at ( 2 , − 3 ) and endpoint N at (8, 5). Round your answer to the nearest tenth, if necessary.

*asked on February 17, 2020* -
## biology

Identify which of the following statements about genes is true. (Select all that apply.) Genes are "read" by tRNA. Genes hold the instructions for traits. Genes are segments on the DNA strand. Genes hold the instructions for making proteins.

*asked on April 18, 2019* -
## physics

What is the work done by a crane to lift a 500kg beam over a height of 50.0m? Assume the crane lifts the beam at a constant velocity.

*asked on October 30, 2018* -
## History

How did the case of Gibbons v. Ogden have an economic impact on America in the 19th century? The Supreme Court's decision allowed state laws to override federal laws when they conflicted regarding economic matters. The Supreme Court's decision allowed

*asked on May 22, 2018* -
## Physics

A car can decelerate at -2.47-m/s2 without skidding when coming to rest on a level road. What would its deceleration (in m/s2) be if the road is inclined at 8.7o and the car moves uphill? (Assume the same static friction coefficient.

*asked on September 17, 2017*