# why does the equation x^2=-9 has no real solution why does the equation x^2 = 9 has two solutions

56,329 questions, page 391
1. ## Algebra II

One method of irrigating crops is called the center picot system. This system rotates a sprinkler pipe from the center of the field to be irrigated. Suppose a farmer places one of these units at the center of a square plot of land 2500 feet on each side.

asked by Alexis on April 1, 2014
2. ## Chemistry

The hydroxide ion reacts with the H2PO2 ion according to the following equation: OH^- + H2PO2^- > HPO2^-2 + H2 The rate law for this reaction rate is R=k[OH^-]^2[H2PO^-2]. What will be the change in the reaction rate if the H2PO2 ion concentration is

asked by Anonymous on July 9, 2015
3. ## Math

1. On the interval [0, 2pi] what are the solutions to the equation sin3xcos2x = -cos3xsin2x + 1? pi/10 and pi/2? 2. What is the value of tan75degrees? √(3) + 1)/(1 - √(3))? 3. Value of cos(130degrees)cos(130degrees) + sin(10degrees)sin(10degrees)? Not

asked by mysterychicken on June 3, 2013
4. ## chem

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

asked by joel on February 23, 2015
5. ## Chemistry

Silver(I) nitrate and sodium sulfate react to form silver(I) sulfate and sodium nitrate. Suppose 45.98 mL of 0.060 M silver(I) nitrate solution and 26.64 mL of 0.10 M sodium sulfate solution are mixed. What is the maximum number of grams of silver(I)

6. ## Chemistry

Silver(I) nitrate and sodium sulfate react to form silver(I) sulfate and sodium nitrate. Suppose 49.02 mL of 0.040 M silver(I) nitrate solution and 39.48 mL of 0.10 M sodium sulfate solution are mixed. What is the maximum number of grams of silver(I)

asked by Bob on September 26, 2017
7. ## Chemistry!

Liquid A has vapor pressure X, and liquid B has vapor pressure Y. What is the mole fraction of the liquid mixture if the vapor above the solution is 30% A by moles? 50% A? 80% A? (calculate in terms of x and y) I'm a little bit confused because I thought

asked by Amy on December 21, 2014
8. ## chem.

Silver(I) nitrate and sodium sulfate react to form silver(I) sulfate and sodium nitrate. Suppose 43.5 mL of 0.040 M silver(I) nitrate solution and 26.58 mL of 0.10 M sodium sulfate solution are mixed. What is the maximum number of grams of silver(I)

asked by Tiffany on February 28, 2010
9. ## Physics kinematics

An archer shoots an arrow at a 72.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow. (a) At what angle must the arrow be released to hit the bull's-eye if its initial speed is 36.0 m/s? (Although neglected

asked by Elijah on September 28, 2015
10. ## math

let V be the set of all real-valued continuous functions defined on R1. If f and g are in V, we define f ¨’ g by (f ¨’ g)(t) = f(t) + g(t). If f is in V and c is a scalar, we define c f by (c f)(t) = cf(t). Then V is a vector space, which is denoted

asked by sara on February 26, 2015
11. ## Fund. concepts skills

Which of the following activities emphasizes the concept of comparing? A. Dividing pigs and cows into two separate groups B. Dividing farm and wild animals into two separate groups C. Discussing similarities and differences between stuffed and real animals

asked by Luis on January 25, 2015
12. ## com 155

Write several sentences describing a recent interaction with a friend or family member about personal finance or credit cards. This interaction may be imagined or real. Before going to college my son got (his) first credit card. (He) now has (himself) in a

asked by Debbe on March 21, 2011

If 720 mL of 0.0165 M aqueous Al3+ and 300 mL of 0.0567 M aqueous Ca2+ are reacted, how many mol of Br- is produced? Al2(SO4)3(aq) + 3 CaBr2(aq) → 2 AlBr3(aq) + 3 CaSO4(s) my answer was .03564 mol of Br will be produced but the real answer is .0340

asked by janice on April 4, 2009
14. ## fundamental concepts

Which of the following activities emphasizes the concept of comparing? A. Dividing pigs and cows into two separate groups B. Dividing farm and wild animals into two separate groups C. Discussing similarities and differences between stuffed and real animals

asked by Daniela on February 4, 2015
15. ## Physics

An archer shoots an arrow at a 78.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow. (a) At what angle must the arrow be released to hit the bull's-eye if its initial speed is 34.0 m/s? (Although neglected

asked by Sam on March 17, 2014
16. ## Physics Projectile Motion

An archer shoots an arrow at a 72.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow. (a) At what angle must the arrow be released to hit the bull's-eye if its initial speed is 36.0 m/s? (Although neglected

asked by Abby on September 29, 2015
17. ## Chemistry

Plot data, preform interpolations or extrapolations, determine slope of best line, determine y intercept. Write equation of the line. T in Kelvins40.0 70.0 100.0 120.0 0 V in ml 250.0 430.0 610.0 730.0 0 Value of V at T= 50.0? Value of T when V= 800.0?

asked by Connie on September 25, 2011
18. ## LA

Key: ☺ = My Answer! 1. Another word for buoyed is a. tired. b. bothered. c. lifted. ☺ 2. Distribution of a birthday cake involves a. cutting. ☺ b. baking. c. frosting. 3. To accumulate is to a. take apart. b. pile up. ☺ c. throw away. 4. A bogus

asked by Jman on April 11, 2013
19. ## chemistry

I did a project for lab chemistry where my aim was to see which substance, from a selection of 4 chlorides, recrystallises from a solution to form the most crystals. The 4 chlorides were KCl, NaCl, MgCl2 and CaCl2. KCl and NaCl didn't form any crystals,

asked by Anonymous on December 9, 2008
20. ## CHemistry

I did a project for lab chemistry where my aim was to see which substance, from a selection of 4 chlorides, recrystallises from a solution to form the most crystals. The 4 chlorides were KCl, NaCl, MgCl2 and CaCl2. KCl and NaCl didn't form any crystals,

asked by Anonymous on December 9, 2008
21. ## Chemistry

I did a project for lab chemistry where my aim was to see which substance, from a selection of 4 chlorides, recrystallises from a solution to form the most crystals. The 4 chlorides were KCl, NaCl, MgCl2 and CaCl2. KCl and NaCl didn't form any crystals,

asked by Anonymous on December 9, 2008
22. ## Math

School is 2 miles from home along a straight road. The table shows your distance from home as you walk home at a constant rate. Time(mins): 10-20-30 Distnce(mi)1.5-1-0.5 1)Is the relationship in the table proportional? 2)Find your distance from school fro

asked by Tim on October 11, 2015
23. ## chemistrybuddy

hi, i am trying to develop a lab where i find the solubility of Sodium acetate. I was wondering in i was in the right path. We are given these three compounds: Acetic acid aka vinegar baking soda (sodium hydrogen carbonate) 0.100mol/l Naoh(aq) 0.100/l

asked by chemistrybuddy on June 2, 2008
24. ## Calculus Help!

At a price of \$7.5 per ticket, a musical theater group can fill every seat in their 1500 seat performance hall. For every additional dollar charged for admission, the number of tickets sold drops by 95. a) What ticket price maximizes revenue? Round your

asked by Anonymous on July 16, 2014
25. ## chemistry

hi, i am trying to develop a lab where i find the solubility of Sodium acetate. I was wondering in i was in the right path. We are given these three compounds: Acetic acid aka vinegar baking soda (sodium hydrogen carbonate) 0.100mol/l Naoh(aq) 0.100/l

asked by chemistrybuddy on June 2, 2008
26. ## physics

A spiral staircase winds up to the top of a tower in an old castle. To measure the height of the tower, a rope is attached to the top of the tower and hung down the center of the staircase. However, nothing is available with which to measure the length of

asked by Coreen on April 1, 2007
27. ## Calculus problem

I really need help on this question. A goldsmith makes a wedding band by taking a gold ball and drilling a wide hole through it. The wedding band has to be 1 cm wide and the hole has to have a diameter of 2 cm. Given that gold weighs 19.32g/cm^3, how heavy

asked by Rain on October 10, 2006
28. ## Science

1. What is molarity of products? I can't decide if it's a. The concentration of the reactants measured in mol/L of solution or b. The concentration of the products measured in mol/L of solution 4. How does pressure relate to reaction rates? I'm stuck

asked by mysterychicken on May 7, 2013
29. ## Physical Science

1. What is molarity of products? I can't decide if it's a. The concentration of the reactants measured in mol/L of solution or b. The concentration of the products measured in mol/L of solution 4. How does pressure relate to reaction rates? I'm stuck

asked by mysterychicken on May 6, 2013
30. ## Science

1. What is molarity of products? I can't decide if it's a. The concentration of the reactants measured in mol/L of solution or b. The concentration of the products measured in mol/L of solution 4. How does pressure relate to reaction rates? I'm stuck

asked by mysterychicen on May 9, 2013
31. ## AP Chemistry

A 1.2M NaOCl solution is prepared by dissolving solid NaOCL in distilled water at 298K. The hydrolysis reaction OCl-(aq) + H2O(l) --> HOCl(aq) + OH-(aq) occurs. a. Calculate the value of the equilibrium constant at 298K for the hydrolysis reaction. b.

asked by Anonymous on February 17, 2010
32. ## Physical Science

1. What is molarity of products? I can't decide if it's a. The concentration of the reactants measured in mol/L of solution or b. The concentration of the products measured in mol/L of solution 4. How does pressure relate to reaction rates? I'm stuck

asked by mysterychicken on May 6, 2013
33. ## math

Michel wants to buy his mother handmade chocolates for Mothers Day. He has \$15.oo to spend. The price of each chocolate is given below. Fudge \$0.60 NutClusters \$0.75 Truffles \$0.80 a)create and solve an equation for each type of chocolate to determine how

asked by sara on December 18, 2011

I have a number of patients this month who need to start a course of treatment. The treatment involves an injection now, followed by 4 more injections at monthly intervals, and then 3 more injections 2 months apart. That's a total of 8 injections in 1

asked by Asfand on August 21, 2016
35. ## physics

In lab, Will burns a 0.6 g peanut beneath 48 g of water, which increases in temperature from 22 degree C to 55 degree C. The amount of heat absorbed by the water can be found with the equation Q =cm \Delta T, where Q is the amount of heat, c the specific

asked by christy on April 3, 2012
36. ## Statistics

Daily water intake (including water used in drinks such as coffee, tea and juice) for Canadian adults follows a normal distribution with mean 1.5 litres and standard deviation 0.31 litres. (d) Using the 68-95-99.7 Rule, approximately 95% of samples of 22

asked by C on November 5, 2014
37. ## Chemistry 12

Write an equation showing the relationship between i) the rate of production of oxygen and the consumption of dinitrogen pentoxide ii) the rate of production of oxygen and the rate of production of nitrogen dioxide iii) the rate of consumption of

asked by Amy on September 9, 2013
38. ## algebra1

What steps do I take in solving this problem? It is about graphing inequalities. 10x+4¡Ý9x+17 put the equation in the form of y ? x + constant. ? means greater than or less than. That is the first step. You are getting no more help until you start

asked by keshia on March 23, 2007
39. ## Chemistry

a. What is the theoretical [H+] of 0.00030 M HCl? Answer: 0.00030 b. The above 0.00030 M HCl solution was prepared in the lab by dilution. The pH of the solution was measured as 4.23. Calculate the [H+] from the measured pH. Answer: pH = 4.23 = 10^ (-4.23)

asked by Cassie on April 3, 2011
40. ## Molar Mass & Elements

The weight percent of oxygen in an oxide that has the formula MO2, is 15.2%. What is the molar mass of this compound? What element or elements are possible for M? what can someone give me a push in the right direction???? Let x be the taonic mass of the

asked by nglaze on June 26, 2006
41. ## Chem

Some very effective rocket fuels are composed of lightweight liquids. The fuel composed of dimethylhydrazine (CH3)2N2H2 mixed with dinitrogen tetroxide was used to power the Lunar Lander in its missions to the moon. The two components react according to

asked by Samantha on February 24, 2009
42. ## Math

number of students in a class = 36 number playing cricket = 16 number playing football = 25 number playing both cricket and football = x write an equation for x how many students play both football and cricket

asked by Rick on April 19, 2016
43. ## Math

Do the data in the table represent a direct variation or an inverse variation? Write an equation to model the data in the table. x 1 3 5 10 y 4 12 20 40 a. direct variation; y=4x b. direct variation; xy=1/4 c. inverse variation; xy=4 d. inverse variation;

asked by Billy on May 22, 2018
44. ## Grammar Check

Can you please see if what I wrote is in formal language and the grammar is correct? Thank You In the novel, Dos Passo's women never equaled success, were mainly considered prositutes, married to get ahead, and were failures when it came to keeping a

asked by Unknown on October 13, 2009
45. ## Math 1 tiny question

I posted this question a couple days ago and I also got help but I have one more question , so is the final answer to the question below: 30 downloads would make site A a better deal. No more than 30 and no less or is it equal to 30 and more or equal to 30

asked by Rihanna on June 3, 2013
46. ## chemistry

suppose you are given the following experimentally observed facts regarding the reactions of silver ion. (a) Ag+ reacts w/ Cl- to give white AgCl (s) (b) Ag+ reacts with ammonia to give a quite stable complex ion, Ag(NH3)2+ (c) a black suspension of solid

asked by Ana on April 2, 2011
47. ## Physics- sound

As the drawing shows, the length of a guitar string is 0.628 m. The frets are numbered for convenience. A performer can play a musical scale on a single string, because the spacing between the frets is designed according to the following rule: When the

asked by Judy on June 18, 2007
48. ## chemistry

a sample of 20.0 mL of 0.100 M HCN (Ka=6.2*10^-10) is titrated with 0.150 M NaOH. a) what volume of NaOH is used in this titration to reach the equivalence point? b) What is the molar concentration of CN- at the equivalence point? c) What is the pH of the

asked by Anonymous on January 8, 2013
49. ## Chemistry

A solution of NaCl in water has a vapor pressure of 18.1 torr at 25 degrees C. What is the mole fraction of NaCl solute particles in this solution? What is vapor pressure at 45 degrees C? Vapor pressure of pure water is 23.8 torr at 25C and 71.9 torr at

asked by Sara on March 7, 2010
50. ## Physics

okay for a) I got the answer as 11.67 seconds and did v=d/t and for b) i found that wavelength= 6km. Im confused how the 100 m deep affects the equation for c and d. The 2011 Japan tsunami was triggered by an earthquake 70 km offshore. The earthquake

asked by Phil on April 18, 2017
51. ## statistics

a mathematics professor wishes to analyze the relationship between the number of papers graded by his department's student homework graders an the total amount of money paid to the graders. He collects data for 12 randomly chosen graders and uses MINITAB

asked by Anonymous on April 19, 2010
52. ## Math

The area of a rectangle is shown below The area of the rectangle is 56 Which of the following are possible values for the length and width of the rectangle? A.length=6cm and width=9cm B.length=7cm and width=8cm C.length=14cm and width=14cm D.Length=28cm

asked by Jerald on March 6, 2013
53. ## MATH ALGEBRA

The Forever Green Nursery owns 7000 white pine trees. Each year the nursery plans to sell 12% of the trees and to then plant 600 new ones. a. Find the # of trees owned by the nursery after 10 year b. Find the # of trees owned by nursery after many years

asked by DA WOOK on August 30, 2015
54. ## Chemistry

The thermite reaction, used to weld rails together in the building of railroads, is described by the following equation. Fe2O3(s) + 2Al(s) --> Al2O3(s) + 2Fe(l) Calculate the mass of iron metal that can be prepared from 150 grams of aluminum and 250 grams

asked by Anonymous on November 3, 2015
55. ## math

It is known that approximately 20% of the population is colour blind. In a sample of 270 people, use the normal approximation to find probability that: a)at least 90 people are colour blind b)exactly 50 people are colour blind I already posted this

asked by Jenna on December 21, 2016

I am stumped about the order of the steps to follow on the right side of a 2-step math equation that I have for homework tonight: 2(6d+3)=18-3(16-3d) Do I multiply -3 times 16 and -3 times -3d or do I isolate the minus/negative sign and multiply 3 times 16

asked by Nancy on March 29, 2007

say that I measured the voltage of electrochemical cells: Zn/Cu: -0.961 V Pb/Cu: -0.360 V Ag/Cu: 0.425 V Sn/Cu: -0.275 V Fe/Cu:-0.516 V Directions: If you assign Cu an arbitrary electrode potential value of 0.00 V, the numbers above are the reduction

asked by jen on March 11, 2009
58. ## Physics

A 20-cm-diameter circular loop of wire is placed in a 0.57-T magnetic field. Part A When the plane of the loop is perpendicular to the field lines, what is the magnetic flux through the loop? Part B The plane of the loop is rotated until it makes a 42 ∘

asked by Dom on March 4, 2017
59. ## phys

Water flows steadily from an open tank into a pipe as shown in the figure. The elevation of the top of the tank is 12.3 m, and the elevation at the pipe is 3.80 m. The initial cross-sectional area of the pipe (at point 2) is 5.60×10−2 m^2; and at where

asked by ami on December 9, 2009
60. ## Bubbles

starting from 105 feet away a person on a bicycle rides towards a checkpoint and then passes it. the rider is traveling at a constant rate of 35 feet per second. THe distance between the bicycle and the checkpoint is given by the equation d= [105-35t] at

asked by BUBBLES on October 19, 2015
61. ## Math

Starting from 105 feet away a person on a bicycle rides towards a checkpoint and then passes it. the rider is traveling at a constant rate of 35 feet per second. THe distance between the bicycle and the checkpoint is given by the equation d= [105-35t] at

asked by BUBBLES on October 19, 2015
62. ## Chemistry

Given the following half-reactions and associated standard reduction potentials: AuBr−4(aq)+3e−→Au(s)+4Br−(aq) E∘red=−0.858V Eu3+(aq)+e−→Eu2+(aq) E∘red=−0.43V IO−(aq)+H2O(l)+2e−→I−(aq)+2OH−(aq) E∘red=+0.49V

asked by Rebecca on April 14, 2014
63. ## Chemistry

A 25.00mL sample of a household cleaning solution was diluted to 250.0mL in a volumetric flask. A 50.00mL aliquot of this solution required 40.38mL of 0.2506 M HCl to reach a bromocresol green end point. Calculate the weight/volume percentage of NH3 in the

asked by Ellen on March 28, 2012
64. ## chemistry

β-Galactosidase (β-gal) is a hydrolase enzyme that catalyzes the hydrolysis of β-galactosides into monosaccharides. A 0.474 gram sample of β-galactosidase is dissolved in water to make 0.144 L of solution, and the osmotic pressure of the solution at 25

asked by can i have some help? on August 29, 2017
65. ## To Math Helpers please:Math 2 questions

I'll retype it, Ive been waiting forever and i just need someone to do these 2 questions so that i can continue doing my other ones so can someone do them: I need help with 2 questions so that I could do my other ones myself so can someone please do these

asked by Anonymous on May 22, 2013
66. ## chemistry

A volume of 100mL of 1.00 M HCl solution is titrated with 1.00 M NaOH solution. You added the following quantities of 1.00 M NaOH to the reaction flask. Classify the following conditions based on whether they are before the equivalence point, at the

asked by Anon on August 6, 2012
67. ## Chemistry

Any help would be great on the below problems. I am not sure where to begin. How do I solve these? Do I use a formula? 1. You are asked to make 500.0 mL of a 4.5M solution of HCl, but the only HCl you have available to dilute is 18.0M. Describe how you

asked by Ashley on August 17, 2010
68. ## Math

Can you show me the work to get these answers also? A.Solve each equation. Leave exact answers: 1.5^3x-2=14 2.log(x-1)-logx=log(x-3) B.If f(x)=x+2/x and g(x)=7/x-5, a. Find the composition (f o g)(x) and simplify completely. b. Find the domain of (f o

asked by Jeff on December 8, 2013
69. ## Physics

Problem 1 (80 points) Consider a spring of equilibrium length L, lying horizontally in a frictionless trough. The spring has cross sectional area S perpendicular to its length. The trough constrains the motion of the spring so that any wave propagating

asked by Brandon on January 29, 2014
70. ## precalculus

The acceleration acting on a falling object due to gravity varies inversely with the square of the object's distance from the center of Earth. At the surface of Earth, where x = 1 Earth radius, the acceleration is y = 9.8 m/s2 1. Use the multiply-multiply

asked by Anonymous on January 20, 2011
71. ## algebra

I have a few math questions I made them just like my actual problems so that I can go through the steps you have went through to answer my own problems...Again THESE ARE NOT THE REAL PROBLEMS JUST EXAMPLES LIKE MINE WITH DIFFERENT NUMBERS. I don't know how

asked by Anonymous on June 12, 2013
72. ## Physics

The distance between a 10 cm tall candle and the reflecting surface of a concave mirror is 40 cm. The radius of curvature of the mirror is 25 cm. Now, A. What is the focal length of the mirror? B. What is the image distance? C. What is the magnification of

73. ## Biology

You need to make 2.5L OF 3M H2SO4. H2SO4 comes as a stock solution in a concentration of 18M. How many ml of stock H2SO4 would you need to make the new solution?

asked by Anonymous on January 15, 2015
74. ## Chemistry

Can you give me an example of a compound that can make Ba3(PO4)2 even more insoluble than it already is (and can you tell me why, just for my own understanding)? You use the common ion effect which is just an extension of the Le Chatelier's Principle. The

asked by Lacey on February 19, 2007
75. ## Math

1. Daniel wants to save at least 20 dollars by putting pennies in a jar daily. On first day, he puts one penny into the jar. The second day he puts 2 pennies into the same jar. On the nth day he pus n pennies into the same jar. Which day is the first day

asked by Ethan on February 22, 2015
76. ## Science

I have posted this question before and I have waited for 3 hours and no one is helping me. Please help me. I have 2 questions. 1.state whether each substance is a mechanical mixture, a suspension, or a solution. My answers are at the bottom. a)green relish

asked by Arushi on December 12, 2010
77. ## Chemistry

3.25g of zinc was added to 50cm^3 of a 4.0 molar dm^-3 HCl. When the reaction was completed the temperature rose by 28 degrees celcius. (a) Is the reaction exothermic or endothermic? (b)All the zinc dissolve in this reaction. How many moles of zinc

asked by Jessica on March 24, 2014
78. ## Math

Suppose you deposit \$2000 in an account with an annual interest rate of 7% compounded quarterly. Use the formula A=P(1+r/n)^n*t and round each answer to 2 decimal places, if necessary. a. Find an equation that gives the amount of money in the account after

asked by Keonn'a on December 4, 2018
79. ## math

For a certain experiment, a student requires 100 cubic centimeters of a solution that is 8% HCI. The storeroom has only solutions that are 15% HCI and 5% HCI. How many cubic centimeters of each available solution should be mixed to get 100 cubic

asked by Mary on August 17, 2010
80. ## Communications

I am supposed to survey people because I am doing a research paper about slang. Can anyone please answer these questions for me? The more answers I get the better. I would appreciate it so much. 1)What kind of slang do you use when text messaging? 2)What

asked by Monica on December 1, 2007
81. ## BIOLOGY HELP!!!!

Does it take energy for polymerization reasctions to proceed or ddo they occur spontaneoulsly?? Why or why not?? http://en.wikipedia.org/wiki/Endothermic_reaction 10. From a bottle of molten nutrient agar you need to pour 20 agar plates each containing 50

asked by BB on October 15, 2006
82. ## medicine

how can i solve this?prepare 150ml of a 7.5%dextrose sol.you have D5%W and D10%W. how much of each sol. is needed? I assume the 7.5 dextrose is going to be on a w/w basis also. This is really simple, no algebra needed. Since 7.5 is halfway between 5 and

asked by rimple on December 2, 2006
83. ## chemistry abs spectrum and wavelength

Hello, can someone please help me? I'm stuck on a question: I'm doing an analysis of the absorbance of FeSCN2+ at it's max wavelength (i.e. 450nm where abs=0.154)The species I used to make the solution tested were Fe(NO3)3, HNO3, and KSCN. Now, the

asked by mary on March 23, 2011
84. ## chemistry abs spectrum and wavelength analysis

Hello, can someone please help me? I'm stuck on a question: I'm doing an analysis of the absorbance of FeSCN2+ at it's max wavelength (i.e. 450nm where abs=0.154)The species I used to make the solution tested were Fe(NO3)3, HNO3, and KSCN. Now, the

asked by mary on March 23, 2011
85. ## math

4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where is the center of the circle and what is it's radius? A. center (2,3) radius=1/4 B. center (2,3) radius=1/2 C. center (-2,-3) radius=1/4 D. center (-2,-3) radius=1/2

asked by Derek on January 11, 2015
86. ## math

4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where is the center of the circle and what is it's radius? A. center (2,3) radius=1/4 B. center (2,3) radius=1/2 C. center (-2,-3) radius=1/4 D. center (-2,-3) radius=1/2

asked by hunter on January 11, 2015
87. ## college pre-calculus

4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where is the center of the circle and what is it's radius? A. center (2,3) radius=1/4 B. center (2,3) radius=1/2 C. center (-2,-3) radius=1/4 D. center (-2,-3) radius=1/2

asked by Derek on January 11, 2015
88. ## Chemistry

my ap chem teacher has been absent for the past two weeks and part of the notes her sub gave us to copy says that In the equation HC2H3O2 + H20 C2H3O2(- charge) + H3O(+ charge) HC2H3O2 is an acid H2O is a base C2H3O2(- charge) is the conjugate base and

asked by Mark on May 15, 2010
89. ## grammar

Is this grammar correct? Of the two football players, Herman was the heaviest. No, it's not correct. You are comparing two people; therefore, you should use "heavier" rather than "heaviest." In the late 1990s, the popularity of MTV’s The Real World

asked by shelly on December 6, 2006
90. ## math

Can somebody please help me with this? Everyday for a week, he counts how many times each player can leg press 350 pounds. The following week, he has each player sprint 40 yards every day. The table shows the average number of leg-press reps and the

asked by Lauren on January 5, 2016
91. ## English 3

A fictional event ... Am I supposed to write about a real story that has happened in MY life ? Or make up a story ? Write a short story that tells about a fictional event in which a central conflict is - or is not.

asked by Ciaria on March 28, 2015
92. ## AP Giannini

Dexter makes a scale drawing of his room. In real life, the room is 10' wide and 12'6" long. In Dexter's drawing, the room is 4"wide, what measure should the length be? explain how you figure this out.

asked by Lily on October 15, 2014
93. ## Calculus

Suppose that f(x), f'(x), and f''(x) are continuous for all real numbers x, and the f has the following properties. I. f is negative on (-inf, 6) and positive on (6,inf). II. f is increasing on (-inf, 8) and positive on 8, inf). III. f is concave down on

asked by Anonymous on December 21, 2012
94. ## math

Please check. (4xy^2)(3x^-4y^5) = 12x^-3y^7 (2x)^5 (3x)^2 = 288x^7 (-3x^2)^4 = 81x^8 True or False: the set of integers is a subset of the set of natural numbers. False All numbers are real numbers. True

asked by anonymous on August 21, 2008
95. ## biology

There is a beaker with 0.4% sucrose solution and the solute potential is -4. Inside the beaker, there is a dialysis bag with 01% sucrose solution, solute potential -1 and pressure potential 0. When the beaker is open to the atmosphere, what is the pressure

asked by izzy on March 8, 2009
96. ## physics

1. When material decays, it emits a particle. An experiment similar to the J.J. Thomson experiment is performed to determine the charge-to-mass ratio of this particle. It is found that the particle moves undeflected through mutually perpendicular magnetic

asked by sam on September 9, 2013
97. ## Economics

Help me on this one please? labor usage -3,7,9,11,17,17,20,24,26,28,30 output-1,2,3,5,8,10,15,18,22,21,23 a. does a cubic equation appear to be a suitable specification, given these data? You may construct a scatter diagram to help with this question.

asked by TrickyEconomics on July 21, 2009
98. ## managerial economics

labor usage -3,7,9,11,17,17,20,24,26,28,30 output-1,2,3,5,8,10,15,18,22,21,23 a. does a cubic equation appear to be a suitable specification, given these data? You may construct a scatter diagram to help with this question. b. using the computer software

asked by Tarsha on July 3, 2007
99. ## Managerial Economics

Help me on this one please? labor usage 3,7,9,11,17,17,20,24,26,28,30 output 1,2,3,5,8,10,15,18,22,21,23 a. does a cubic equation appear to be a suitable specification, given these data? You may construct a scatter diagram to help with this question.

asked by Jan on September 12, 2009
100. ## college

Q. A soccer ball is kicked from the ground. When it reaches a height of 5.74 m, the velocity is v=5.86i+7.50j m/s. a) Determine the maximum height that the ball reaches. b) Determine the total horizontal distance travelled by the ball. c) What is the speed

asked by N on October 17, 2010