# Ruby

Most popular questions and responses by Ruby-
## Spanish

2. ¿Conocen a mi amiga Maria? A. Sí, conocen a tu amiga Maria. B. Sí, conocemos tu a amgia Maria. C. Sí, saben a tu amiga Maria. D. Sí, sabemos a tu amiga Maria. D? 3. ¿_____ tú dónde estáb la biblioteca? A. Conoces B. Sabemos C. Conozco D. Sabes

*asked on August 23, 2018* -
## English

I have a few questions that I'm stuck on. 1. Identify how the pronoun is used in the sentence. Just today Terry bought a picture for her. direct object indirect object object of a preposition*** (I think this is the answer because of the preposition for

*asked on March 2, 2016* -
## Math

Hi guys! I am desperately in need of help. I really need to do good on this test but I am uncertain if I am doing this portion correctly. Can someone check my work? 11. Which inequality matches the graph? (The dot on the graph is at 1 and the arrow is

*asked on January 13, 2017* -
## Physical science

Which type of graph best shows data that are parts of a whole?

*asked on October 29, 2015* -
## Math

What makes the statement true? 7^-2=? A- 49 B- 1/49*** C- 14 D- 1/14 Am I correct?

*asked on October 14, 2016* -
## Algebra

On the first part of a trip to Carmel traveling on the freeway, Marge averaged 70 mph. On the rest of the trip, which was 25 mi longer than the first part, she averaged 60mph. Find the total distance to Carmel if the second part of the trip took

*asked on November 27, 2016* -
## Algebra

True or False 1. – 5, – 5, – 5, – 5, – 5, … is an arithmetic sequence. 2. In an arithmetic sequence, it is possible that the 13th term is equal to its 53rd term. 3. In an arithmetic sequence, the common difference is computed by subtracting the

*asked on September 9, 2014* -
## English (ELA)

Hi! I really need to do well on this quiz, can someone check my answers? 1. What can you infer from this sentence near the stat of "The Story-Teller" Most of the Aunts remarks began with "Don't" and nearly all of the children's remarks began with "Why" A.

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

For f(x) = 0.01(2)^x, find the average rate of change from x = 2 to x = 10. A.1.275 B.8 C.10.2 D.10.24

*asked on November 4, 2015* -
## math

1. Which of the following expressions is written in scientific notation? 1. 73.4 x 105 2. 0.09 × 107 3. 80 x 103 4. 4.22 x 10–3 2. Which of the following is 0.0000000708 written in scientific notation? 1. 7.08 x 10–8 2. 7.8 x 10–8 3. 708 x 10–10

*asked on January 31, 2013* -
## Physics

A submarine is at a depth of 15.0 m under the ocean surface. The inside of the submarine is kept at atmospheric pressure. What is the net force being exerted on a circular window of the submarine that has a radius of 25 cm? The density of the ocean water

*asked on January 21, 2014* -
## physics.

A steel beam is used in the construction of a skyscraper. By what fraction (change in L)/Lo does the length of the beam increase when the temperature changes from that on a cold winter day (-15 degree F) to that on a summer day (+ 105 degree F)? I got

*asked on February 10, 2008* -
## physics

a soccer player kicks a stationary ball giving it a speed of 20m/s at an angle of 15degrees to the horizontal. what is the maximum height reached by the ball?

*asked on October 15, 2010* -
## calculus

A ball of radius 10 has a round hole of radius 8 drilled through its center. Find the volume of the resulting solid.

*asked on February 3, 2009* -
## business letter

can you check for me? Thanks Assigment: write a business letter according to the background. Background:Assume that you’ve worked for the last five years as an administrative assistant for the Human Resources Department of Broadworth General Hospital.

*asked on February 13, 2010* -
## Math

Mrs Li bought some oranges. She gave 1/2 of them to her sister, 1/4 of the remainder to her neighbour, 3/5 of those left to her children and had 6 left in the end. How many oranges did Mrs Li buy? Explain your workings

*asked on November 5, 2011* -
## physics

1. A piece of rectangular block weighing 5 kg is pressed on a vertical wall by a horizontal force applied to the block. If the coefficient of friction between the block and the wall is 2.0, what force is necessary to keep the block in place? 2. If the

*asked on March 20, 2013* -
## mathematics

Please help me answer this question; 1.A metal gutter open at the tops and ends, is bent up from material 30 cm wide to form a rectangular cross section. a) If the base of the gutter is x cm wide, find the height of the gutter. b)Show that the area of the

*asked on August 29, 2011* -
## physics

-A person throws a ball upward into the air with an initial velocity of 15 m per second. - How could you calculate how high the ball goes and how long the ball is in the air before it comes to the thrower's hand?

*asked on July 21, 2008* -
## Biology

I understand the role of enzymes in chemical reactions but metabolism is the sum of all the reactions in a cell or in the body. So how do enzymes control metabolism? Can they change the number of reactions in a body or can enzymes just control the chemical

*asked on April 6, 2019* -
## Math

Please help me I don't understand what to do for this, as I haven't learned what to do if I need to find the average of something in Scientific Notation. I tried doing it using division, but I got 0.62 x 10^2, which isn't one of the choices. Could someone

*asked on October 12, 2016* -
## physics

the question is this: suppose you want to design an air-bag system that can protect the driver in an head-on collision at a speed of 100 km/h. estimate how fast the airbag must inflate to protect the driver-- I GOT THE CORRECT ANSWER TO THIS ONE ALREADY.

*asked on July 16, 2008* -
## Algebra

Unit 1: ready, set, succeed- lesson 2 3. C or D ?? 4. A ? Please help

*asked on August 26, 2019* -
## algebra

tommy is playing with a kite, and it flies 80 feet high with 100 feet of string released. what is the horizontal distance from tommy to the kite?

*asked on October 26, 2015* -
## math

how to solve 7x^2+7y^2-28x+63y-4=0 in general equation of circle?

*asked on June 5, 2019* -
## physics

a block of mass 0,5kg is attached to a spring .The spring is compressed to a distance of0,1m.The block is released .The block moves 0,07m past the equilibrium position .What is the force of friction that does work on the block. spring constant is 500

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

The mass of a 10p coin is 6.5g.What is the mass in kilograms of £20 in 10ps?

*asked on January 30, 2017* -
## physics

A box is resting on a table frictionless). Determine the weight of the box and the normal force acting on it. (a) If the box was pushed down, with a force of 40N, determine again the normal force acting on the box. (b) If the box was pulled up with a force

*asked on July 22, 2008* -
## business memo

can someone double check for me? This is the second part to the business letter I posted a few days ago. Process: Draft an interoffice memorandum to Miriam Hopkins, the Director of Human Resources: a. Assume that you’ve received confirmation from Jeremy

*asked on February 15, 2010* -
## chemistry

I have a problem that I need help with. The diameter of the oil molecule has to be calculated and presented in scientific notation. The data in the questions tells me that drop of oil(volume 0.05cm ^3) is released from a dropper onto the surface of the

*asked on February 4, 2007* -
## algebra 1

1. MULTI-STEP PROBLEM There are 5743 known amphibian species in the world. Of these, 1856 species are judged to be at risk of extinction, and another 113 species may already be extinct. a. Find the probability that an amphibian species chosen at random is

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

You are skier A, the first skier in a skiing event with three other skiers. Compared to your time, skier B is slower, by a time of +00:28. Skier C has a time of +02:13, and skier D has a time of -01:24. Who is the fastest skier.

*asked on September 2, 2015* -
## Maths

Assuming the earth to be a sphere of radius 6370 km.If seventy five percent of the earth's surface is covered by water, then find how many square kilometres is area of the land.

*asked on March 7, 2016* -
## physics

a block of mass 0,5kg is attached to a spring.The spring is compressed to a distance of 0,1m .The block is released .The block moves 0.07m past the eequilibrium position .What is the force of friction that does work on the block? spring const is 500.

*asked on August 29, 2014* -
## physics help?

A coin with a diameter of 3.30 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 16.1 rad/s and rolls in a straight line without slipping. If the rotation slows with an angular acceleration of magnitude

*asked on November 28, 2010* -
## math

A family spends 20% of its monthly income on food, 23% on rent, and 42% on other expenses and saves the balance. If the family saves $360 per month, what is its monthly income?

*asked on March 18, 2008* -
## chemistry

help needed in drawing the diagram to show how hydrogen has numerous spectral lines I also need help with this question.... ---------------- ---------------- ---------------- ---------------- ---------------- -------------------- Each line above represents

*asked on February 6, 2007* -
## CHEM

A 3.5g sample of potassium chloride(KCl)is dissolved in 10mL of water.The resulting solution is the added to 60mL of a 0.5M CaCl2 soltion. Assuming that the volume are additive,calculate the molar concentration and %w/v of each ion present in final

*asked on October 13, 2017* -
## Algebra

Biologists tagged 180 fish in a lake on January 1. On February 1, they returned and collected a random sample of 45 fish, 15 of which had been previously tagged. On the basis of this experiment, approximately how many fish does the lake have?

*asked on November 27, 2016* -
## math

Write in expanded form. 7.37 Is this the correct answer? 7+3/10+7/100

*asked on November 3, 2011* -
## CIS

Assume you have a computer that contains 1 GB of memory. It contains 4 memory slots. Each slot can contain on of the following memory modules: 128 MB, 246 MB, 512 MB, 1GB or 2 GB. Two of the slots are currently used, each contain a 512 MB memory module.

*asked on March 3, 2017* -
## Chemistry

h2c4h4o4 + 2naoh --> 2h2o + na2c4h4o4 as for the previous question im sorry i forgot to plug the maleic acid in the formula properly. so this ones it ^ .2213 of c4h4o4 used (maleic acid) and .1 M NaOH 1. show the equation for 1st and 2nd ionization 2. find

*asked on March 12, 2012* -
## Math

Laura is moving up to the attic and wants to paint a wall white. The wall is a triangle with a base of 7.5 feet and a height of 12.25 feet. What is the area of the wall? Please help me!!

*asked on March 30, 2017* -
## math

You are skier A, the first skier in a skiing event with three other skiers. Compared to your time, skier B is slower, by a time of +00:28. Skier C has a time of +02:13, and skier D has a time of -01:24. Who is the fastest skier

*asked on September 2, 2015* -
## Maths

please help me answer this question: A pilot sets to fly from B to A and wishes to set a course to offset a 32 km/h easterly wind.The aircraft can fly at the speed of 800km/h in still air. A is 256 from B in a bearing of 330 degrees. a)on what course must

*asked on August 11, 2011* -
## Physics

Physics Homework _____________________________________________________________ 1.) A particle at t 1 = -2.0 s is at x 1 = 3.4 cm and at t 2 = 4.5 s is at x2 = 8.5 cm. What is its average velocity? Can you calculate its average speed from this data?

*asked on July 20, 2008* -
## Pre-Algebra

I have no clue how to solve these, could someone help me? For questions 6-8, multiple the following polynomials. 7. 4a(a^2+7a+4) A. 4a+28a^2+16a B. 4a^3+28a^2+16a C. 4a^3+44a D. 44a^4 8. (2y-3)(3y-2) A. 6y^2-13y+6 B. 6y^2-13y-6 C. 6y^2+13y-6 D. 6y^2+13y+6

*asked on May 23, 2017* -
## chemistry

The rate constant of a reaction is 6.2 x 10^-3s-1 at 25 degrees C, and the activation energy is 33.6 KJ/mol.. What is k at 75 degrees C? Enter your answer in scientific notation.

*asked on September 13, 2015* -
## bobpursley please help

A coin with a diameter of 3.30 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 16.1 rad/s and rolls in a straight line without slipping. If the rotation slows with an angular acceleration of magnitude

*asked on November 28, 2010* -
## Algebra

A private plane traveled from Seattle to a rugged wilderness, at an average speed of 220 mph. On the return trip, the average speed was 264mph. If the total traveling time was 5 hours, how far is Seattle from the wilderness?

*asked on November 27, 2016* -
## Math: Algebra

By what percent will a fraction increase if its numerator is decreased by 10% and its denominator is decreased by 50%?

*asked on March 6, 2016* -
## physics

earlier in this forum, marina asked the same question as i did. unfortunately, someone did answer, very clearly, but for some reason i remained to be a little lost. Here is the question: A car traveling 90 km/h is 100 m behind a truck traveling 75 km/h.

*asked on July 20, 2008* -
## chemistry

help required in calculating the pH value of a .84 mols per litre solution of sulfuric acid. I understand that pH = -log 10 (2x 0.84), I am not very experienced with logs and need assistance as to which keys to press on the scientific calculator in

*asked on March 6, 2007* -
## chemistry

I am in the process of calculating the hydrogen ion concentration in a .25litre solution of sulfuric acid,.21g of sulfuric acid was disolved in water to make the solution. I have calculated the molarity of the acid to be 2.14x10^-3 mol per litre. I also

*asked on March 5, 2007* -
## Science

How much sodium hydroxide, at what concentration, do I need to add to 500 mL of 0.1 N HCL to obtain pH 6.8. How do you calculate this? pH = -log(H^+) M HCl = N HCl mols = M x L. After you know mols HCl you have, then make a solution of NaOH and calculate

*asked on February 5, 2007* -
## Algebra

1. Why cant you use the formula of the infinite geometric series on 1/81 + 1/27 + 1/9 + 1/3 + ..... 2. Using concepts of infinite geometric series, show that 0.9999 ..... = 1.

*asked on September 9, 2014* -
## economics

what is a country's excess quantity of demand to a nation's? exports or imports

*asked on February 9, 2008* -
## math

a square carpet covers an area of 64 ft ^2. what is the length of each side of the carpet?

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

Center at (2,-5), conjugate axis parallel to the y-axis, slopes at asymptotes numerically one-sixteenth times the length of the latus rectum, and distance between foci is 2sqrt145.

*asked on May 14, 2015* -
## college calc

Approximate the square root of 64.3, y=x^(1/2). Starting point is the square root of 64.

*asked on October 26, 2012* -
## Math

Amandeep decides to grow a vegetable garden. She wants to make it 10.1m long and 4.2m wide. She is worried about rabbits eating from her garden so she builds a fence around it. The fence will be 11.2m long and 5m wide. What is the area between the fence

*asked on January 12, 2012* -
## Math

Please check my work. 1) 64 divide -4 = -16 2) -144 divide (-9) = 16 3) Simplify -9 and a small 2 = -81 4) Simplify (-3) and a small 3 = -27 5) Add -4/11 + 5/11 = 1/11 6) subtract 5/11- [-3/11] = 8/11 7) multiply [-7/8] • [-2/4] = 7/16 8) divide -3.5

*asked on November 8, 2011* -
## Chemistry

Superphosphate, a water soluble fertilizer, is sometimes marked as a "triple phosphate". It is a mixture of Ca(H2PO4)2 + 2CaSO4. Ca3(PO4)2 + 2H2SO4 --> Ca(H2PO4)2 + 2CaSO4 If you treat 400g of calcium phosphate with 267g of sulfuric acid, how many g of

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

I would like my equation checked, sodium cyanide and water.I have worked the balanced equation as: NaCN+H20=NaOH+HCN. If you want the molecular equation this looks good to me. Actually, it's the CN^- that is hydrolyzed (reacts with water) and the ionic

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

A metal plate infused with excess electrons will attract a proton placed nearby?

*asked on July 16, 2018* -
## Algebra

A private plane traveled from Seattle to a rugged wilderness, at an average speed of 220 mph. On the return trip, the average speed was 264mph. If the total traveling time was 5 hours, how far is Seattle from the wilderness?

*asked on November 26, 2016* -
## Science

The potential energy of a projectile at its maximum height is equal to its kinetic energy there . If the velocity of projection is 20m/s its time of flight is ?

*asked on July 19, 2016* -
## ALGEBRA

Sarah took the advertising department from her company on a round trip to meet with a potential client. Including Sarah a total of 66 people took the trip. She was able to purchase coach tickets for $150150 and first class tickets for $11601160. She

*asked on January 24, 2016* -
## physics

two girls exeret a force of 30 N and 10 N on a bag in same direction. a dog tugs at bag and drag it in oppsite direction with the force of 5 N. calculate the new force exerted on bag and draw a vector diagram. F= 10+30 = 40 N dog applied force in opposite

*asked on December 21, 2014* -
## Chemistry

Suppose u place a beaker containing a solution in the refrigerator. An hour later, white solid found at thr bottom of beaker, wat hapoened? Why?

*asked on February 24, 2013* -
## physics

A car moving with a constant acceleration covers the distance between two points 80 m apart in 8.0 s. Its velocity as it passes the second point is 15 m/s. (a) What was the speed at the first point? (b) What is the constant acceleration? (c) How far behind

*asked on October 22, 2011* -
## math[fractions]

how would u multiply two fractions ex. 2 2/3 times 3 5/6 First, make each one an improper fraction. To do this, multiply the denominator by the whole number in front of it and then add the numerator. Put all of that on top of the denominator: 3*2=6 6+2=8 2

*asked on January 23, 2007* -
## Math- Mixed Numbers

1. White 17/4 as a mixed number. Hi, could someone please explain how to do this? Correct me if I’m wrong but do I try to multiply 4 x how many times I can before it goes to 17 and the number I get is the whole number and the newmerator is the numbers

*asked on October 7, 2015* -
## Math

Remove the xy-term by rotation of axes, reduce the resulting equation to standard form and trace the curve on the new axes: 16x^2-24xy+9y^2-60x-80y+100=0

*asked on May 18, 2015* -
## Dental Terminology and Anatomy

1.The largest of the salivary glands is the A. Submandibular B. Sublingual C. Minor D. Parotid 2.The portion of the tooth that is used for mastication and is visble in the oral cavity is the A. Cervix B. Crown C. Root D. Gingiva 3.The ____ makes up the

*asked on September 21, 2011* -
## chemistry

What mass iron(III) oxide could be produced from 8.2 mol of oxygen gas in the synthesis of iron(III)?(Balanced equation)

*asked on March 15, 2010* -
## physics

-Suppose that a person is standing on the edge of a cliff 50 m high, so that the ball in his/her hand can fall to the base of the cliff. Questions (a)-How long does it take to reach the base of the cliff? (b)- What is the total distance traveled by the

*asked on July 21, 2008* -
## algebra

is this correct?: -4^4= -256 (-5)^2= 25 (-3)^5= -243 ( I don't get the meaning of the parantheses) thank you!

*asked on August 26, 2015* -
## physics

a horizontal force of 3 N is excerted on an object while a vertical force of 4 N is excerted at the same time. calculate the resultant force on the object? 3 square + 4 square = 25 so the resultant force will be 25 N

*asked on December 21, 2014* -
## Algebra

1. Solve for the 101st term of the sequence whose 1st term is x-y and d=2x+y-3. 2. In the sequence 2, 6, 10, … , what term has a value of 106? 3. Solve for the 101st term of the sequence: 6-p, 4+p, 2+3p, 5p, … .

*asked on September 9, 2014* -
## math

suppose you use the rule (3x+1,3y-4) to transform the original figure into a new figure. How would the side lengths of the new figure compare to the side lengths of the original? I need help fast. Thank you so much.

*asked on January 16, 2012* -
## Mathematics

A man walked for some distance at 8 km/h, and for an equal distance at 5 km/h. The total time he took was 13/4 hours. Find the total distance he walked. Explain your workings

*asked on November 5, 2011* -
## trigonometry

Simplify:2sec^2A-2/4tan A...Please help,anyone who can answer

*asked on June 5, 2011* -
## geometry

two of the angle of a arallelogram measure 75 what are the measures of the other two angle

*asked on November 29, 2010* -
## English

Hi there, I am doing a presentation on Martin Luther King's March on Washington August 28th, 1963 and was wondering if you direct me to any useful links to information, videos and pictures.

*asked on March 10, 2009* -
## physics

How would you reword the terms of this equation: (1/2)M Vo^2 = M g H Where H is the maximum height above the thrower's hand. H = Vo²/(2 g) = 11.5 m Could you substitute the letters H & M with Y, Yo, V, Vo, G, T, or use any of these four newton's equtions:

*asked on July 22, 2008* -
## Math

What is the value of y if x = -3? y = 1 = 2(x-5) Plug in -3 for x, in the equation for y, and see what you get. I think you copied the problem wrong. Is the first = sign supposed to be a + or - sign? If not, you have already stated that y = 1. That cannot

*asked on June 29, 2007* -
## chemistry

I require assistance with the drawing of the lewis structures for hydrogen cyanide and cyanogen. I have already drawn the structured molecular formulas and am now stuck. H:C:::N: :N:::C:C:::N:

*asked on March 5, 2007* -
## chemistry

I need help in drawing a structual formula for hydrogen cyanide(HCN)and cyanogen(CN)2, the drawing has to bear in mind the valencies of hydrogen(1),nitrogen(3) and carbon (4), any help appreciated H:C:::N: :N:::C:C:::N: Check my thinking. The previous one,

*asked on February 6, 2007* -
## Algebra

Given ________, – 243, – 226, – 209, – 192, – 175, … a. What is the 67th term of the sequence b. What is the series of the first 27 terms of the sequence

*asked on September 9, 2014* -
## Math

If Logan's family can drive 23.125 miles on 1 gallon of gas, how far can they drive on 17 gallons?

*asked on April 14, 2014* -
## MATH

A customer has a balance of $1,350. Interest is paid at the end of 12 months. Assuming the balance remains at $1,350 for all 12 months, how much interest will be earned after 12 months if the interest rate on the account is 5.5%?

*asked on March 17, 2012* -
## trig

Simplify the expression cos^2 x (sec^2 x-1)

*asked on March 8, 2012* -
## math

How to I round 613,572,947 to the nearest tens. My teacher confuses me with this. Would it be 50?

*asked on February 25, 2012* -
## history

against the Ku Klux Klan. Together, these were known as the _______ Acts. A. Grant B. Force C. Klan D. Reconciliation

*asked on February 2, 2012* -
## Basic math

The company Acceptance had employees with monthly salaries of $1,700, $1400, $7,000, $1550, and $2,500. Find the median of these salaries. How do I answer this?

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

The maximum speed that a car can travel around a flat curved road is 18m/s. What would be the maximum speed for that car around a curve with half the radius?

*asked on November 17, 2009* -
## Science

You are given a wooden block that is 25cm long, 8cm wide and 3cm tall. Also, the block of wood has a mass of 350 grams. What is the density of this block of wood?

*asked on September 22, 2009* -
## Pythagorean theorm

i have been workin on this problem for hours and desperatly need help. Im suppose to solve the following three problems in the pythagoream theorem form and also find the ratios. Can someone pleasse help me =] Pythagorean Theorem a² + b² = c² 1.) O =

*asked on July 24, 2008* -
## Algebra

Solve problem by showing necessary steps to resolve. 0.06q + 14 = 0.3q - 5.2 Subract 0.06 q from both sides. 14 = 0.24q - 5.2 Add 5.2 to both sides 19.2 = 0.24 q Finally, divide both sides by 0.24 You will end up with q on one side of the equation and a

*asked on July 7, 2007*

## Pages

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