# 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 409
1. ## algebra

what is the solution of the following system of equations? y = 0 x = y + 2 a) (0,2) b) (2,0) c) (1,2) d) (2,1) thank you

asked by kid on April 29, 2010
2. ## Algebra

Solve (x+12)(x-10)(x+3)>0 Solution set is:

asked by Greg on June 9, 2010
3. ## algebra

what is the solution of the following system of equations? y = -2/3x y = 1 a)(1,-2/3) b)(-3/2,1) c)(-2,3) d)(1,-3)

asked by poo on April 29, 2010
4. ## algebra 1

What is the solution to -2x+5y=-1 and 3x+2y=11 by using elimination method

asked by Rosaura on January 17, 2012
5. ## algebra

2x+3y=1 4x+6y=2 is there a order pair here or is there no solution

asked by a on November 1, 2009
6. ## Algebra

What is the x-coordinate of the solution of the system y=1/3+8 and 2x-y=2?

asked by Sylvie on January 16, 2013
7. ## Algebra 1A

solve: 7x13

asked by James on September 28, 2009
8. ## Math

Solve the system below: Y= x^2-4 Y= -4 A. 0, -4 B. -4, 0 C. 0, -4)(-4,0 D. No solution

asked by Alysa on April 22, 2016
9. ## math

What is the solution to the proportion shown below? (x+3)/4 = (x+2)/3

asked by Jane on April 12, 2012
10. ## math

What is the solution to the proportion shown below? (x+3)/4 = (x+2)/3

asked by Jane on April 12, 2012
11. ## Algebra 1A

Help!! solve 2.4x+22.0>55.0-8.6x the solution set is {x]x> ?}

asked by Paul on September 30, 2009
12. ## calculus

if f(x)=4^(2x)-1, find :f(1)+f(2) solution pls

asked by gen on November 12, 2010
13. ## Math

What is the solution to the proportion shown below? (x+3)/4 = (x+2)/3

asked by Jane on April 12, 2012
14. ## Biochemistry

What is the concentration of HNO3 in a solution that has a pH of 3.4?

asked by Freddy on January 24, 2011
15. ## Chemistry

calculate the pH of 0.10 M HCI solution?

asked by Anonymous on September 30, 2009
16. ## Inverse Trig

What is the general solution to y = arcsin 0?

asked by Annabelle on April 21, 2014
17. ## chemistry

what is brandy's solution in chemestry?

asked by dorothy on July 7, 2013
18. ## Inverse Trig

What is the general solution to y = arcsin 1?

asked by Annabelle on April 21, 2014
19. ## calculus

if f(x)=3^(x)-3^(-x), find : f(2), f(-1) solution pls..

asked by gen on November 12, 2010
20. ## chemistry

How many moles NaOH in 66.4 mL of 0.1 M solution?

asked by Anonymous on December 8, 2011
21. ## Chemistry

What is the pH for a solution with a hydrogen concentration of 1.00 x 10^6?

asked by Adryan on December 6, 2011
22. ## ALGEBRA 2

For what value of k does the system below not have a unique solution? -1x + 7y + 2z = 6 2x + 1y + kz = -11 3x - 6y - 2z = -25 A.5 B.0 C.-2 D.-8

asked by True on July 22, 2012

For what value of k does the system below not have a unique solution? -1x + 7y + 2z = 6 2x + 1y + kz = -11 3x - 6y - 2z = -25 A.5 B.0 C.-2 D.-8

asked by True on July 22, 2012
24. ## chem

the % T of brass solution is 55.0%, 1)what is the Transmittance(T)?

asked by a on July 11, 2011
25. ## Algebra 2 help!

What is the solution set to the following system? x+y=3 x^2+y^2=9 a.(0,-3)(3,0) b.(0,3)(-3,0) c.(0,3)(3,0) d.(0,-3)(-3,0)

asked by Angela on January 9, 2014

Which number is a solution of the inequality? g>6.4 a. 7 b. 6 c. 6.4 d. -7 Which number is a solution of the inequality? g+3>6 a. 3 b. 4 c. -3 d. -4 Which number is a solution of the inequality? 12

asked by Ashley mccgarvey on January 9, 2014
27. ## Algebra

-2 = |m- 1/5 | -2 + 1/5 = |m - 1/5 + 1/5| I know it's No solution but the fraction confuses me.

asked by Dylan on November 7, 2017
28. ## chemistry

what is the molarity of the KCI solution.

asked by Anonymous on November 19, 2015
29. ## Math

i tried and tried and i cant find the answer. is it not a solution. (3/x)-1=7/(x-20)

asked by monty on November 23, 2009
30. ## Science

Why is the KI solution added in excess

asked by Kabeer on April 24, 2017
31. ## chemistry

calculate the pH of a 2.0 M solution of KCl.

asked by chelsea on July 6, 2011
32. ## chem

how do I caluclate (H3O+) in a solution if the PH is the following 1.81

asked by dada78 on April 4, 2011
33. ## Math7

Which ordered pair is not a solution of y = 4x -9 (-9, 27) (3, -21) (-6, 15)I think this one? (5, -28)

asked by moby on April 25, 2014
34. ## Science

Find the [H+] in a 0.0255 M solution of HF if the Ka = 7.2 X 10^ -4

asked by Tina on July 29, 2012
35. ## math

what is the solution to this problem 6 5x=1296

asked by tasha on April 27, 2013
36. ## algebra

Which of the following is a solution of the compound inequality? 3x + 8 < 2 or x + 12 > 2 - x

asked by Joshua on January 23, 2011
37. ## Chemistry

How can i prepare a solution of 12 g 50% (w/v) NaOH?

asked by PAnos on June 17, 2011
38. ## math

Which ordered pair is not a solution of y = 4x -9 (-9, 27) (3, -21) (-6, 15)I think this one? (5, -28)

asked by really on April 7, 2016
39. ## Algebra.

What is the solution to the system? use elimination . -18.6x+ 17.2y=90.2 14.2x+ 3.4y= -35.8 a.(3,2) b.(-3,2) c.(2/3,4/9) d.(2,3) IS IT D??

asked by Sierra. on January 5, 2016
40. ## ALGERBRA

CAN YOU PLEASE TELL ME THE SOLUTION FOR THE FOLLOWING 5X>-4 BUT THE SIGN HAS A LINE UNDER IT I REALLY NEED HELP

asked by elaine on March 29, 2011
41. ## Elementary Algebra

How do I figure out whether or not (-1,-2) is a solution for the system. y=3x-1 2x+y=4

asked by Wanda on August 7, 2012
42. ## math

if x,y are integral solution of 2x^2-3xy-2y^2=7 then value of |x+y| is:

asked by kabhir on June 10, 2014
43. ## math

3x + 5y = 11 are (9,-3) a solution. the answer I got was no can someone please help me if that is incorrect.

asked by janay1978 on June 8, 2009
44. ## Algebra 1

What is the solution to the system? use elimination . -18.6x+ 17.2y=90.2 14.2x+ 3.4y= -35.8 a.(3,2) b.(-3,2) c.(2/3,4/9) d.(2,3) IS IT D??

asked by sierra. on January 5, 2016
45. ## Algebra 1

What is the solution of the system? use substitution . 4x+2y=10, y=-3x+6

asked by Sierra Elizabeth on January 5, 2016
46. ## Algebra

Simplify in terms of i. 1/4 √-24 Solution: 1/2i√6 ?

asked by Anonymous on October 27, 2009
47. ## Algebra 1

What is the solution of the system? use substitution . 4x+2y=10, y=-3x+6

asked by Sierra Elizabeth on January 4, 2016
48. ## Algebra 1

What is the solution? use elimination . 4x-y=23 7x-y=21 PLEASE HELPPP!!!!

asked by Sierra Elizabeth on January 5, 2016
49. ## chemistry

which solution formed only by gases

asked by Anonymous on January 23, 2011
50. ## chemistry

How many moles of permanganate are in 5.93 L of a 3.81 M solution?

asked by Mcculum on October 3, 2017
51. ## Chemistry

Is 20.0 mL of 3.0 M HF a buffer solution with an approximate pH of 3?

asked by Dan on May 4, 2010
52. ## trig

verifying a solution. 4cos^2 2x-2=0

asked by tomas on May 31, 2011
53. ## calculus

if y1=x^(2)+3x-1 and y2= x-5 find: a. y1+y2 b. y1-y2 c. y1*y2 solution pls..

asked by gen on November 12, 2010
54. ## math

Find two solution of equation5x-3y=10

asked by tarun on March 8, 2015
55. ## Chemistry

what is the OH- concentration of 0.08 M solution of CH3COONa

asked by Rahul on May 4, 2017
56. ## math

Find p such that px^2-12x+4=0 has only one solution. Thank you!!!

asked by Jane on April 14, 2016
57. ## science

What is the pH of a 0.05 M solution of potassium hydroxide??

asked by sege on May 6, 2017
58. ## Algebra

Which of the following values of x is a solution to the question 18-4×=6-6×

asked by Jarrod on October 1, 2016
59. ## algebra

What is the solution of the system? y = -3x 3x + 2y =6 I don't get this, please help.

asked by james on December 16, 2015
60. ## 8th grade

WHAT IS A CHEMICAL SOLUTION AND GIVE AN EXAMPLE?

asked by DANNY on October 26, 2009
61. ## Partial Differential Equations

At the He-Ne laser wavelength (L= 632.8 nm) the refractive indices of crystal quartz are n o = 1.54264 and n e = 1.55171 calculated from its Sellmeier equation. The laser is incident from the air onto the surface of crystal quartz at an angle of incidence

asked by Joy on November 12, 2013

At the He-Ne laser wavelength (L= 632.8 nm) the refractive indices of crystal quartz are n o = 1.54264 and n e = 1.55171 calculated from its Sellmeier equation. The laser is incident from the air onto the surface of crystal quartz at an angle of incidence

asked by Joy on November 13, 2013
63. ## Biology

In each set up the dialysis tubing contains a solution of 30% glucose and safranin. However, the set ups differ in the contents of the beaker. The control set up has the same solution in the beaker while in the experimental set up it contains just water.

asked by Jason on January 24, 2011
64. ## Math Word Problems

Citydog Screen Printers received two orders for a t-shirt designed for a math symposium. The first order was for 40 shirts at a total cost of \$295 and the second order was for an additional 80 shirts at a total cost of \$565. Each order included a shipping

asked by Lisa on September 14, 2007
65. ## English

1. I especially liked the acting of the main actor and special effects. 2. I especially liked the music and the beautiful scenery in the movie. 3. I especially liked the acting of the main actor and the main actress. 4. I especially liked the roles of the

asked by rfvv on April 5, 2012
66. ## Human Growth

Life span development studies are based on the idea that: A. development occurs early in life, but not in late adulthood. B. there is almost no continuity over the lifespan, so an individual’s history has little effect on development. C. sociohistorical

asked by Tonya on October 22, 2015
67. ## Macroeconomics

Where are we in the business cycle? What is the real GDP today? What is the largest component of GDP? What is the smallest component of GDP? What is the fastest growing component of GDP and why? What components of GDP were involved in the change from last

asked by Thomas on December 1, 2013
68. ## Math

An architect is drawing a scale model of a new mall. The real mall will be 1800 feet long. The scale the architect is using is 1 inch is equal to 100 feet. How long will the model be?

asked by Brittany on March 11, 2013
69. ## Pharmacy Math

A prescription calls for 250ml of a 0.1N hydrochloric acid HCL solution. How many ml of concentrated hydrochloric acid are needed to make this solution? The specific gravity hydrochloric acid is 1.18 the molecular weight is 36.46 and the concentration is

asked by Fai on July 29, 2012
70. ## calculus

A flea moves along the line y = -3 according to the equation: x = t^3 - 9t^2 + 24t where x is its x coordinate at time t secs. Determine: 1) the position, velocity, and acceleration of the flea at time 3 secs. Answer: position - 3^3 - 9(3)^2 + 24(3) = 18

asked by molly on February 4, 2016
71. ## Crucible Help!!

In his autobiography Timebends, Arthur Miller writes that "the real story" of the Salem witch trials is to be found in "the breaking of charity" within a human community. Write a brief essay explaning what you think Miller means by this interesting

asked by Koikoi humli on August 4, 2012
72. ## math

I really need help. i don't know if this should be posted here or if it's allowed, but oh well.. so just to get straight to point, there's this huge test this month in a few days; i'm not prepared for it AT ALL. it will be 3+ hours but anyway i been

asked by Carl Wheezer on May 10, 2017
73. ## Chemistry

The heat of neutralization of HCl(aq) and NaOH(aq) is -55.90 kJ/mol of water produced. If 50.00 mL of 1.16 M NaOH at 25.15 ºC is added to 25.00 mL of 1.79 M HCl at 26.34 ºC in a plastic-foam cup calorimeter, what willthe solution temperature be

asked by Alexis on November 1, 2015
74. ## Physics ( using earth to find pressure of planet y

3. A model of Earth’s interior: Look up the radius and mass of the Earth. Radius is 6,371 km Mass is 5.974 x 10^24 kg Calculate its average density. p_e = (5.974 x 10^24 kg)/ (4/3)pi r^3 = (5.974 x 10^24 kg)/ (4/3)pi (6371)^3 = 5.54 g/cm^3 Imagine a

asked by Kim on September 10, 2015
75. ## Chemistry

1.The Volume of oxygen required for the complete combustion of 500ML of ethyne at STP..A)2.00ML B)1.25 C)1.71 D)1.00 2.A Chemical Engineer finds that 250ml CuSO4 reacts with excess NaOH to create 2.37g of precipitate.Calculate the Concentration of

asked by Alex on June 4, 2009
76. ## Chem(check my work, mass percent acetic acid)

During the spoiling process, fruit juices often oxidize to create vinegar. A sample of a beverage with a mass of 2.578 grams reguires 18.62 ml of .095M NaOH for neutralization. What is the mass percent of acetic acid present, assuming that no other acids

asked by Kizner on June 12, 2006
77. ## Check answers

1. An indorser's implied contract to pay a subsequent holder in the event that an instrument is dishonored is known as an indorser's A. duty B. accommodation C. primary liability D. secondary liability I chose C. 2. A defense that arises out of some

asked by Tine on February 11, 2015
78. ## English

Okay, heres the question: Choose one of the main characters and pretend you are introducing him/her to a friend for the first time. What are the things your friend should know about htis person? What makes him/her interesting? What makes him/her unique?

asked by Larry on December 17, 2008
79. ## Statistics

Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 100, with a sample size of (i) 400, (ii) 1600. What is the effect of the sample size? (b) Find the margin of error for

asked by courtney on April 5, 2015
80. ## Physics

I'm working on a final physics exam, and I've got everything but these two that I'm stuck on. Any help would be appreciated, and explanations too (: --A------B---(----F---- A and B are both pointing up. 1. ^ In that diagram, the image of object A would be

asked by Jessica on August 5, 2010
81. ## Ions & Atoms-Lab Part 1

We did a lab on Ions and Atoms. The purpose was basically to identify the properties of an ion and compare them to atoms. These were the Materials -safety goggles -apron -copper(II) chloride (CuCl2) -3 250-ml beakers -water aluminum foil -scissors

asked by Sara on April 19, 2010
82. ## Economics

Economics Production Schedule The owner of a car wash is trying to decide on the number of people to employ based on the following short-run production function: Q = 6L - 0.5L2, with the corresponding marginal product of labor equation, MPL = 6 - L. a.

asked by Keisha on November 2, 2008
83. ## Algebra 1

11) Tell which real number corresponds to the situation. During a quiz, a person loses 1800 pts. answer: -1800 12) Solve for y z=yq Answer: z-q=y 13) Solve using the multiplication principle 10x=-90 Answer: x= -9 14) Collect like terms 20w+w+14/19w Answer:

asked by deedee on November 5, 2008
84. ## Math

The school is having a big event in the gym and wants to use their rectangular tables. 6 people can sit together at one rectangular table. If 2 tables are placed together, 10 people can sit together. So the pattern I noticed is 4 people added whenever a

asked by John Dosley on July 27, 2016
85. ## English

I urgently need to know if the following questions are correct? As they refer to Macbeth's plot, do you think I should use the simple present? 1)What is (was) Lady Macbeth’s plan? 2)Who is (was) the real Macbeth? 3)Who is blamed for Duncan’s death in

asked by Henry2 on October 4, 2011
86. ## Chemistry

A solution of hexane in the solvent (CH3)2CO has a mole fraction of CH3(CH2)4CH3 of 0.114. What mass (g) of the solution must be taken if 1690 g of hexane is needed? Molar Mass (g/mol) CH3(CH2)4CH3 100.21 (CH3)2CO 58.05 Density (kg/L): CH3(CH2)4CH3 0.6838

asked by Scott on September 2, 2008
87. ## AP Chemistry

Given: N2O4 (g) « 2NO2 (g) @ 25 degrees celcius, Kc is 5.84 x 10^-3. (A) Calculate the equilibrium concentrations of both gases when 4.00 grams of N2O4 is placed in a 2.00 L flask at 25 degrees celcius. (B) What will be the new equilibrium concentrations

asked by Frank on April 22, 2010
88. ## Finance/Algebra

Suppose you bought an 8% coupon bond one year ago for \$1090.00. The bond sells for \$1063.00 today. Assuming a \$1000 face value, what was ur total dollar return over the past year? What was the nominal rate of return over the past year? And, if inflation

asked by Sunny on May 18, 2010
89. ## Physics

The Achilles tendon, which connects the calf muscles to the heel, is the thickest and strongest tendon in the body. In extreme activities, such as sprinting, it can be subjected to forces as high as 13.0 times a person's weight. According to one set of

asked by Christina on November 13, 2007
90. ## Chemistry- Dr.Bob!

Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperature of the air in the house. Assuming that all the energy given off in the reaction goes to heating up only the

asked by Lana on January 13, 2016
91. ## Chemistry

Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperature of the air in the house. Assuming that all the energy given off in the reaction goes to heating up only the

asked by Lana on January 13, 2016
92. ## Chemistry

The piperazine content of an impure commercial material can be determined by precipitating and weighing the diacetate: (C2H4)2N2H2 + 2 CH3COOH → (C2H4)2N2H2(CH3COOH)2 In one experiment, 0.3126 gram of the sample was dissolved in 25 mL of acetone, and 1

asked by Tom on August 23, 2014
93. ## physics

In this equation, vd is the speed of the detector, and vs is the speed of the source. Also, fs is the frequency of the source, and fd is the frequency of the detector. If the detector moves toward the source, vd is positive. If the source moves toward the

asked by lauren on March 28, 2012
94. ## CHEMISTRY

Write the net ionic equation for the reaction between...(and MUST INCLUDE STATES, please post answers to all so i can verify if im correct and explanation to one of them) a) potassium hydroxide and copper(I) nitrate b) potassium sulfite and lead(II)

asked by NEED HELP PLEASE!!! on April 6, 2014
95. ## Algebra I

Describe a real world relationship between the area of a rectangle and its width, as the width varies and the length at the same time. Sketch a graph to show the relationship. So far, I have that even when the width increases, the width times the length

asked by Anonymous on November 13, 2013
96. ## Algebra

I am suppose to come up with an real life example where radical expression might be used.I was just wondering if someone could look over my example and tell me if it sounds ok. Imagine a right triangle ABC, where B is the right angle. Say you wanted to

asked by Jess on July 10, 2007
97. ## Writing

Can you proofread my essay? Be Yourself “To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment.” In the stories, “Not Poor, Just Broke,” by Dick Gregory, “Salvation,” by Langston Hughes,

asked by Mattea on December 7, 2012
98. ## Chemistry

1. Calculate the MOLALITY (m=mol/kg) of the salt water solution. Note: Include the mass of ice AND volume of water when calculating the TOTAL MASS of the solvent (water). (1ml of water=1g of water. Is my work correct? So what I did was, Knowing m=mol/kg

asked by MJay. on February 7, 2017
99. ## algebra

Could someone please check my work. what is the slope of the line that passes through the given points?(2,12( and (6,11) -1/4 (my choice) 1/4 4 -4 My work: 11-12/6-2=-1/4 what is the slope of the line that passes through the given points? undefined( my

asked by brandon on September 7, 2012
100. ## math

the annual household cost of telephone service in the US increased at a relatively constant rate of \$27.80 per year from 1981 to 2001. IN 2001 the annual household cost of telephone service was \$914. a:What was the annual household cost of telephone

asked by Taylor on November 14, 2013