# 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 413-
## Math

Without solving, explain how you can tell whether the solution to 0.5x= 10 is less than or greater than 1.

*asked by Maya on February 5, 2018* -
## algebra 1

Use mental math to determine the solution x/3=24. a. x=6 b. x=8 c. x=27 d. x=72 b is it?

*asked by oto on September 6, 2016* -
## CHEm 1442

Calculate the pH of a 0.21 M CoCl3 solution. The Ka value for Co(H2O)63+ is 1.0 10-5.

*asked by pinki on March 12, 2010* -
## chemistry

The temperature at which crystal will first appear when a solution is cooled from 60°c to 20°c?

*asked by Anonymous on September 26, 2015* -
## chemistry

How is colloid distinguished from a solution or a suspension?

*asked by bobby on April 28, 2009* -
## Physics

Is KNO3 soluble in KOH solution?

*asked by Nisha on September 5, 2016* -
## chemistry

The temperature at which crystal will first appear when a solution is cooled from 60°c to 20°c?

*asked by Anonymous on September 26, 2015* -
## Chemistry

Calculate the concentration of all species in a 0.15 M KF solution. Ka = 6.4 x 10-4 for HF.

*asked by Brian on February 27, 2011* -
## CHEM

Calculate the pH of a .7 M solution of ammonium chloride

*asked by Heather on September 22, 2011* -
## chem

the pH of a neutral solution at 90 digree celsias is a >7 b < 7 c =7 d both b and c

*asked by asdfg on September 8, 2016* -
## Alegebra 1

Determine whether (2,11) is a solution to y=17x-13. Thank you before hand, for your help.

*asked by esther on December 19, 2010* -
## science

1 what is mean by hypertonic, isotonic and hypotonic solution.

*asked by sangam on June 26, 2008* -
## math

what is the solution to the system of equations ? x=y-3 x 3y=13 A. (1,4) B.(4,1) C.(7,4) D. (2.5,5.5) please help my best answer is b

*asked by Anastasia on May 20, 2016* -
## Chemistry

0.25 mol dm-3 solution of hydrochloric acid?

*asked by Rain on March 29, 2017* -
## chemistry

What would be the pH of 0.568 g of HClO4 per 250 mL of solution?

*asked by Vaneza ASAP on February 26, 2011* -
## math

determine which ordered pair is not a solution of y = -5x -4 (10, -52) (7,-39) (-7, 31) (8,-44)

*asked by maria on December 20, 2016* -
## MAT 110

How many milliliters of a 25% solution contain 10 g of the pure drug?

*asked by Vickie on December 7, 2010* -
## Chemistry

Why is the carbonate solution boiled before titrating?

*asked by Candice on January 18, 2015* -
## math

Determine which ordered pair is not a solution of y=-5x-4. (10,-52) (7,-39) (-7,31) (8,-44) I think it is (7,-39)

*asked by Lost on April 16, 2015* -
## College Chemistry

Determine the pH of a solution that contains 5.3*10^-2 M in HClO4 and 3.0*10^-2 M in HCl?

*asked by Mickey on February 26, 2011* -
## algebra

Determine whether (-4,5) is a solution of 4x + 8y =1 I would like the steps so I can practice this.

*asked by Help on September 10, 2009* -
## algebra

is the ordered pair a solution of the inequality? (6,15); 8y-9x>8

*asked by nina on November 11, 2011* -
## Math 116

9/10th (3+8x)+3greater or equal to 15 what is the solution to this?

*asked by Allison on September 22, 2011* -
## math help asap

what is the solution to 2x+9greater or less then 5 and 2x-13greater or equal to -9.

*asked by Allison on September 22, 2011* -
## ma

The only value of b for which the following system of equations in(s,u,z)does not have a unique solution is: b = 3s+3u-z=3 -3s+3u=-3 -3s+bu-z=-3

*asked by Tracy on February 5, 2011* -
## chemistry

Determine the [OH^-] of a solution that is 0.145 M in CO3^2-.

*asked by nurul on December 21, 2016* -
## trig

What's the general solution for 3sin^2x+sinxcosx=2

*asked by Piwokazi on September 10, 2011* -
## math

What is the value of the y-coordinate of the solution to the system of equations x + 2y = 9 and x - y = 3?

*asked by billy on March 16, 2010* -
## Math

Is (0,2) a orderd pair a solution of 4x - 3y = 6? Explain.

*asked by Liz on February 7, 2011* -
## math

solve using multiplication -6x>1/13 The solution is < -1/78 is this correct?

*asked by jason on June 29, 2009* -
## chemistry

What volume of a 1.35 M solution contains 6.2mol of MgCl?

*asked by isaac on April 10, 2019* -
## chemistry

what is the molarity of 275mL of a solution containing 23.83 mg of Mg Cl(2)

*asked by melissa on December 3, 2010* -
## math

Write the general solution to y = arcsin 0.

*asked by bella on April 16, 2019* -
## Chemistry

The pH of a solution halfway to the equivalence point

*asked by Anonymous on November 8, 2017* -
## math am i right?

Solve (x+18)(x-18)(x+12)>0 Solution set is {x|-8,-12} Is this correct?

*asked by Sam on July 9, 2011* -
## Algebra 1A

solve for the indicated letter b=a+d for a= the solution is a= b. is this correct? thanks

*asked by Lea on September 26, 2009* -
## advanced algebra 2 - math

graph the solution set of the system: y>3x+2, y-2/5x-3 1/5, y>-1

*asked by logan on October 13, 2010* -
## Math 116

if I solve this by substitution 8x+7y=-13 x=29-7y I end up with -3.8 But I think there is no solution

*asked by Katie A on September 29, 2011* -
## Algebra 4

Determine whether the ordered pair is a solution (-8,3);8x+y,-2

*asked by Anonymous on May 12, 2010* -
## Algebra

Thank you for answering (x+20)(x -10)(x+11)>0. How do I write the solution set of {x| }

*asked by Daniel on May 30, 2010* -
## algebra

solution set using interval notation −9y + 6 > −6y − 15

*asked by Shelinda Knight on September 4, 2018* -
## Chemistry

300 ml of a 0.5NKOH solution, how can it be neutralized

*asked by willie on July 13, 2011* -
## chemistry

What is the molarity of OH- in an aqueous solution that is 0.31 M HNO3?

*asked by Priscilla on December 3, 2011* -
## Trigonometry

Solution set of sin 2x = -1/2 in [0,2pi)

*asked by Name on November 12, 2017* -
## Algebra 1

Which ordered pair is a solution of the inequality? y>= 4x-5 3,4 2,1 3,0 1,1

*asked by Steve on December 21, 2014* -
## chemistry

What is the molarity of OH- in an aqueous solution that is 0.17 M HClO4?

*asked by Ashley on December 4, 2011* -
## Chemistry

How many mL of HCl solution are required to change pH from 2.67 to 9.25?

*asked by Rhonda on March 24, 2015* -
## algebra

Which ordered pair is a solution of y = x – 4? a. (−1, −5) b. (0, −3) c. (2, 6) d. (3, 1) my answer C (2, 6)

*asked by J J on November 28, 2016* -
## chemistry

The pH of an HCl solution is found to be 1.74. Therefore the [H3O+] is:

*asked by Anonymous on December 5, 2011* -
## algebra

Determine the orderd pair is a solution y=x + 2/7 A.(0,0) B.(-1,2/5) C.(1,2/5)*** D.(2,2 2/5)

*asked by Jojo on November 6, 2017* -
## Intermediate Algebra

Which of the following ordered pairs is a solution to the system: 6x - 2y = 2 9x - 3y = 1

*asked by Anonymous on November 29, 2015* -
## math

Find p(p^-1(x)) when p(x)=x^2-4 I tried solving this and I got x^4-x+20 but that has no solution so I'm a little confused.

*asked by maath on September 15, 2018* -
## Science

Describe a solution,suspension, and colloid

*asked by Frances on December 8, 2011* -
## Pre-calculus ( Absolute value)

Why does |7 + 3x| = x -1 have no solution? I could plug in, for example 5, and the answer would be positive. Thank you =)

*asked by Lucina on May 10, 2015* -
## Chemistry

How many ml of 1M HCl would you need to make 50.0 mL of 0.125M solution?

*asked by Danielle on February 22, 2011* -
## calculus

if f(x)=Inx, find: f(2)+f(3) solution pls

*asked by gen on November 12, 2010* -
## Chemistry

What must be the pH of a solution that is 0.049 M Fe3+ to just cause Fe(OH)3(s) to precipitate?

*asked by Chemistry Confused on April 19, 2010* -
## Chemistry

How many ml of 1M HCl would you need to make 50.0 mL of 0.125M solution?

*asked by Danielle on February 22, 2011* -
## Vectors

Can you please explain how to answer this? What is a solution for the following system? x-4y+z=2 and -x+4y-2z=8 a) x=4s+12, y=s, z=-10 b) x=s+4, y=3s, z=-4 c) x=2s+5, y=s, z=-12 d) x=s, y=4s, z=-12

*asked by Sara on March 17, 2015* -
## math-differential equations

hi i need to know how to do this one thanks Find the solution to yx + x + (dy/dx) = 0 ; y(9) = -9 y = ???? Does this separate the variables? dy/dx=-x(y+1) dy/(y+1) = -x dx

*asked by kayla on August 5, 2007* -
## chemistry

You have a 0.0825 M solution of HCl. You expect the pH to be

*asked by Anonymous on December 5, 2011* -
## Math

which graph represents the solution to the given system y =-x+4 y = 1/3x + 8 Please help me..

*asked by Luna on January 18, 2019* -
## Chemistry

What is the hydrogen ion concentration of a solution with pH of 3.4?

*asked by Mmeso on September 13, 2018* -
## algebra

would 5 trees be a solution to the inequalit inpart b

*asked by janet on October 30, 2009* -
## Chemistry

If 38.5 mL of 8.9 ✕ 10-3 M HBr is added to 27.0 mL of 4.6 ✕ 10-3 M LiOH, what is the pH of the solution?

*asked by . on March 10, 2019* -
## Algebra

Determine which ordered pair is a solution of y=x+2/5 (0,0) (-1,2/5)****** (1,2/5) (2,2 2/5)

*asked by Trish on September 8, 2015* -
## Math

solving using the solution method. x+10y=41 x+9y=37 =

*asked by Ms.Ellis on July 2, 2011* -
## Chemistry

Calculate the ZnCO3 in a buffer solution with a pH of 9.83

*asked by Katy on April 25, 2017* -
## math

How many 1oz bottles will this solution fill.

*asked by Kelly on June 15, 2016* -
## chemistry

find the concentration of HCL if the pH of the solution is 0.50

*asked by Jessica on March 17, 2011* -
## Chemistry

Calculate the ph of a solution that is 0.157m HCI?

*asked by James on May 4, 2016* -
## math

show a graph for solution set 3x>7x+20

*asked by shanae on November 6, 2007* -
## chemistry

how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?

*asked by erin on November 29, 2011* -
## biotech

how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?

*asked by erin on November 29, 2011* -
## Algebra

Determine which ordered pair is a solution of y=x+2/5. A(0,0) B(-1,2/5) C(1,2/5) D(2,2 2/5)

*asked by Mellisa B on August 29, 2016* -
## Math

Identify the solution(s) of the system of equations, if any. x + 5y = 7 4x - 5y = 13

*asked by Cathy on January 23, 2015* -
## math graphing please help

which graph response the solution to the given system? y=-x+5 y=1/4x+10

*asked by roeeeee on January 23, 2019* -
## Chem

How many grams of salt are there in 2.9 mL of solution that has a concentration of 1.4 g/mL?

*asked by csd on September 14, 2016* -
## Science

could a solution of a liquid and a gas be soda

*asked by becca on January 8, 2008* -
## Chemistry

What is the solvent in70% of alchol solution?

*asked by Ridwan darebo on October 25, 2016* -
## analytical chemistry

At what ph will Al(OH)3 begin to preciptate from a .10 M solution of AlCl3?

*asked by TK on October 27, 2015* -
## Differential Equations

Find general solution. 2ty dy/dt = 3y^2 - t^2

*asked by George on February 14, 2018* -
## chemistry

At what ph will Al(OH)3 begin to precipitate from a .10 M solution of AlCl3?

*asked by lisa on October 27, 2015* -
## another one please help

{-9x-3y=147 -x+7y=-101 The solution of the system is:

*asked by Carlos on April 7, 2017* -
## chemistry

How many grams of NaOH are there in 2.5L of a 0.343M solution?

*asked by n/a on March 12, 2011* -
## differential Equations

Find general solution [t - sqrt(ty) ] dy/dt = y

*asked by George on February 14, 2018* -
## math

determine which ordered pair is a solution of y=2x-3.

*asked by anna on May 5, 2016* -
## ap chemistry

What is the [H3O+] of a solution with [OH-] = 6.3 × 10-4 M? A. 6.3 × 10-18 M B. 10.80 M C. 6.3 × 10-4 M D. 1.6 × 10-11 M DrBob222 can you help me with this question please?

*asked by jessica on September 14, 2016* -
## math

Evaluate:24(12)-9/3. Find the answer and the solution.

*asked by Erica Anne C. Arellano on July 25, 2011* -
## biology

How can i get air in a bag, into a beaker of solution?

*asked by rose on November 5, 2015* -
## chemistry

calculate the molarity of 18.0 ml of h2so4 in 2.0l of solution?

*asked by diane on December 5, 2010* -
## math

determine which ordered pair is a solution of y -5x + 10. A.(-15,5) B.(2,0) C.(-1,-5) D.(3,25) I think it is A, can someone help?

*asked by meow meow kit kat on March 10, 2019* -
## science

How to determine the molarity of a 1.8% NaCl solution.

*asked by bill on February 24, 2011* -
## chemistry

How many grams of NaOH are there in 2.5L of a 0.343M solution?

*asked by twynna on February 9, 2011* -
## CHEMISTRY

What is the pH of a solution with [H3O+] = 1 x 10-9 M? My answer is pH=9. is that correct

*asked by KKK on December 1, 2014* -
## chemistry

How many millimoles of H+ are present in 1.00 L of 1.24 M CF3CO2H solution?

*asked by andy on April 1, 2010* -
## Chemistry

What is the solubility of ZnCO3 at 25 o C in a buffer solution with a pH of 9.74?

*asked by Snow on April 28, 2016* -
## algebra

im really stuck on this one What is the solution to the linear inequality y ¡Ý 4x - 5 ?

*asked by Meredith Grey on March 25, 2015* -
## chemistry

What is the pH of a 0.5 M solution of NaHCO3? Kb = 2.4x10-8 (base)

*asked by Randy on November 11, 2015* -
## chem

0.283 M solution X 176.12 g = 50 g/L how many g per 30 mL? 150?

*asked by Anonymous on April 30, 2016*

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