Ruby

Most popular questions and responses by Ruby
1. 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
2. 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
3. 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
4. Physical science

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

asked on October 29, 2015
5. 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
6. 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
7. 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
8. 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
9. 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
10. 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
11. 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
12. 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
13. 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
14. 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

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
16. 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
17. 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
18. 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
19. 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
20. 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
21. 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
22. 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
23. Algebra

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

asked on August 26, 2019
24. 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
25. math

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

asked on June 5, 2019
26. 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
27. 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
28. 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

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
30. 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
31. 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
32. 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
33. 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
34. 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
35. 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
36. 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
37. 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
38. 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
39. 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
40. math

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

asked on November 3, 2011
41. 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
42. 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
43. 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
44. 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
45. 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
46. 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
47. 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
48. 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

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
50. 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
51. 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
52. 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
53. 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
54. 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
55. 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
56. 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
57. economics

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

asked on February 9, 2008
58. 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
59. 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
60. 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
61. 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
62. 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
63. 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
64. 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
65. Electronic

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

asked on July 16, 2018
66. 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
67. 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
68. 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
69. 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
70. 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
71. 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
72. 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
73. 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
74. 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
75. 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
76. 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
77. 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
78. 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
79. 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
80. 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
81. 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
82. 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
83. trigonometry

asked on June 5, 2011
84. geometry

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

asked on November 29, 2010
85. 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
86. 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
87. 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
88. 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
89. 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
90. 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
91. 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
92. 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
93. trig

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

asked on March 8, 2012
94. 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
95. 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
96. 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
97. 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
98. 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
99. 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
100. 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

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