# 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 83-
## algebra

What are the coordinates for each equation. 3x-2y=-18 -3x-y=0

*asked by Christina on August 13, 2012* -
## math

solve the following equation: k/2 - k/5 - k/6 =2

*asked by Anonymous on June 10, 2017* -
## Math

How many solutions does the equation x+2 = 2x have

*asked by Blissy on December 20, 2013* -
## Math

solve the equation 7+3m=28 . A.m=18 B.m=11 2/3 C.m=9 D.m=7

*asked by Bro on March 27, 2019* -
## physics

what is the equation for acceleration?

*asked by Anonymous on September 21, 2010* -
## Math

Graph the equation X = 1/2 y2

*asked by Linda on June 17, 2012* -
## Differential Equation

what is the differential equation of (2x+y+1)dx + (2y+x+1)dy=0

*asked by shanel on September 9, 2017* -
## Math

How many solutions does the equation |2x − 2| = x have? Would it be 1

*asked by Miley on December 27, 2013* -
## math.

solve the equation. 2x^2+5=41

*asked by algebra. on October 21, 2008* -
## math

(-4,6);4x=9y+7 the equation of the line is y= need some help here.

*asked by mikey123 on November 1, 2008* -
## Math

Find the dy/dx for each equation a) y=ln(2x^6-15) b) y= 3√2x^2-3x-1/5 c) y=x^4/x^2+1

*asked by Paul on February 21, 2013* -
## geometry

Solve the equation for x. -5x = 3 + y is it x = (3+y)/-5

*asked by Rose on September 29, 2010* -
## Math

1. Complete the equation. (b^2)^?=b^8 A. 6 B. 4 C. 3 D. 1/16

*asked by BTS on February 6, 2019* -
## Pre-calculus

Can someone help me with this equation: y = (2*10^(-44))*(e^(0.055x))?

*asked by Mel on May 6, 2017* -
## math

Solve this equation: y/9 + 5= 0

*asked by tayaqua on June 20, 2012* -
## math

m=6/7(5,-7) the equation of the line is y=

*asked by mikey123 on October 31, 2008* -
## math

solving this equation...0.9x + 9 ¡Ü 1.3x-6

*asked by amy on March 17, 2010* -
## math

solve the following equation: 6y - 20=2y -4

*asked by tia on June 21, 2012* -
## Physics

Consider a 4.6 kilogram object moves from the origin always to the right (call that x-axis). Its speed increases uniformly (means constant acceleration) from zero to 0.667 metres/sec. 1.Describe how its velocity changes: initial, final and whether it

*asked by PhysicsStudents on November 18, 2015* -
## Algebra

Solving word problem using quadratic equation. The book says the answer is 20 feet. I know how to solve the equation. I do not know where the 20 feet is coming from. Problem: Mr. Ingram wants to add a garage to his home. The dimensions of his home are 50ft

*asked by G on May 26, 2008* -
## Science Experiment

I had three pieces of potato. I put one in a 5% solution, second one in a 1% solution, and the third one in a .1%. The 5% solution turned the potato black. The 1% solution had no effect. The .1% turned the potato blue. How does the concentration of a

*asked by Jennifer on September 14, 2008* -
## biology

A red blood cell is placed into each of the following solutions. Indicate whether crenation, hemolysis, or neither will occur. Solution A: 3.21% (m/v) NaCl Solution B: 1.65% (m/v) glucose Solution C: distilled H2O Solution D: 6.97% (m/v) glucose Solution

*asked by sol on September 29, 2011* -
## Economics

The answer i got is : GDP grew 10% GDP for 2006 using 2005 as the base year increase by 20% real GDP grow? 10% If i'm right, let me know, if not, please show Calculation Thank You Use the following data to answer questions 1-3 (be sure to provide all

*asked by John Price on December 1, 2008* -
## mathematics

Train L and Train M leave a station at the same time heading in opposite directions. Train L is going north at an average speed of 70 miles per hour (mph). Train M is going south at an average speed of 85 mph. How long does it take each train, in hours, to

*asked by derp on February 8, 2011* -
## chemistry

if the pH of a half-neutralized acid solution is 5.4, how would you find the [H+] of the the solution. There is 1.0 g of L-ascorbic acid which was dissolved in 100 ml of water. That solution was split in two and 50 ml of the solution was titrated with 0.2

*asked by tom on April 17, 2008* -
## Chemistry

a) To make an acid solution, 6.8 x 10-3 mole of a strong acid (6.8 x 10-3 mole H3O+) is dissolved in water to give a 550 mL solution. What is the pH and [OH-] of the solution? b) 150 mL of water is added to 50 mL of the solution produced in question 3.

*asked by Anonymous on October 17, 2013* -
## Chemistry. PLEASE HELP

a) To make an acid solution, 6.8 x 10-3 mole of a strong acid (6.8 x 10-3 mole H3O+) is dissolved in water to give a 550 mL solution. What is the pH and [OH-] of the solution? b) 150 mL of water is added to 50 mL of the solution produced in question 3.

*asked by Anonymous on October 17, 2013* -
## algebra can someone help my buddy ray out

identify the vertex and the axis of symmetry of the graph for the function y=3(x+2)^2 a.vertex(2,-3 axis of symmetry x=2 b.vertex(-2,-3) axis of symmetry x=-2 c.vertex(2,3) axis of symmetry x=2 d.vertex(-2,3) axis of symmetry x=-2 identify the maximum or

*asked by johnny on October 4, 2013* -
## Chemistry

Complete the charge balance equation for an aqueous solution of H2CO3 that ionizes to HCO3^- and CO3^2- ______ = ______ + _______ + _______ Given choices: [HCO3^-],[CO3^2-], [OH^-], 2[H^+], [H2CO3], 2[CO3^2-], 3[H^+], {H^+] I don't understand how to do

*asked by Sam on February 4, 2013* -
## Critical Thinking

Nick is chief engineer in a phosphate fertilizer plant that generates more than 1 million tons per year of gypsum, a waste collected in a nearby pile. Over many years, the pile has grown into a mountain containing 40 million tons of waste. There is little

*asked by Aya on November 25, 2011* -
## microeconomics

how do i figure this out? if all incomes were equalized by government taxes and transfer payments, how much would the average household in each income quintile gaine (via transfers) or lose (via taxes)? Hummm, for real or as a hypothetical exercise. The

*asked by Billie on May 23, 2007* -
## MATH

Choose the equation you can use to solve the following problem. Each cupcake costs $4.00. How many cupcakes, x, are purchased if the total cost is $36.00? 4+x=36 36-x=4 4x=36 x÷4+36 (1 point) 2. Choose the equations you can use to solve the following

*asked by Anonymous on September 17, 2018* -
## AP Chemistry

Write the balanced molecular, complete ionic, and net ionic equations for each of the following acid-base reactions. (Type your answer using the format [NH4]+ for NH4+ and [Ni(CN)4]2- for Ni(CN)42-. Use the lowest possible coefficients.) (a) HClO4(aq) +

*asked by Rahul on September 24, 2011* -
## slope help

write an equatiion with a slope of 3 that goes throught the point. write an equatiion with a slope of -1/2 that goes throught the point. determine equation for the line with pints (6,3) and slope of 2. equation of line points (2,8) slope -3

*asked by anonymous on May 4, 2013* -
## problem solving

One small and one large animal puzzle kit cost $16 altogether. If the large kit costs three times as much as the small kit, how much does each kit cost? 4 and 12 A= large animalpuzzle kit. a= small animal puzzle kit. A + a = 16 A = 3a =================

*asked by Oshia on January 31, 2007* -
## Alegebra

The mortgage department of the company is selling two model homes that are located on the same block. The square footage, as well as the type of model, determines the cost of these homes. e) The second home has 200 square feet more than the square footage

*asked by Darla on June 26, 2010* -
## algebra

I answered some of the questions but i need help with number 7, 8, and 10. Here is an example of the assignment. I am the current secretary of a horse rescue, in charge of fund raising as well as organization and meeting minutes. We have decided to

*asked by sharon on June 8, 2012* -
## Math

A shopkeeper packages together two types of hard candy: peppermint and cinnamon. Separately the peppermint candy sell for $1.80/kg and the cinnamon candy sells for $2.40/kg. The mixture sells for $2.16/kg. Determine the amount of each type of candy that is

*asked by Sienna on January 13, 2012* -
## physics

In a television set, electrons are accelerated from rest through a potential difference of 18 kV. The electrons then pass through a 0.34 T magnetic field that deflects them to the appropriate spot on the screen. Find the magnitude of the maximum magnetic

*asked by Anna on February 26, 2007* -
## college chemistry - answer check ASAP!

The corrosion of iron can be thought of as an electrochemical cell reaction. Calculate the voltage difference between two points of corroding iron differing only in their partial pressures of oxygen: 0.20 atm of oxygen at one point and 0.0010 atm of oxygen

*asked by anne on March 13, 2010* -
## calc

standard equations of circles that have centers on line 5x-2y=-21 and are tangent to both axis. Any ideas?? First express the line as in point slope form y=(5/2)x - 21/2 The center must be on the line, so it is a point expressed as (x,(5/2)x - 21/2) In

*asked by Melba on September 26, 2006* -
## Chemistry

A solution is created by dissolving 13.0 grams of ammonium chloride in enough water to make 265 mL of solution. How many moles of ammonium chloride are present in the resulting solution? When thinking about the amount of solute present in a solution,

*asked by Onye on March 3, 2018* -
## American History

3. In dissent, Justice Harlan wrote the "real meaning" of the railcar segregation law was to suggest that "colored citizens are so inferior and degraded that they cannot be allowed to sit in the public coaches occupied by white citizens." How might we

*asked by Elizabeth on September 5, 2011* -
## math

If f is a real valued funtion of a real variable defined by: x^2 - 3x + 2 x-> ------------ x^2 +3x + 2 using the maximal domain convention. Determine whether f is injective and/or surjective and find its range. If f is not inective, demonstrate this by

*asked by ramdrop on July 22, 2010* -
## Chemistry

1) The formation of water is represented by the following equation : 2H2(g) + O2(g) -> 2H2O(g) a.What is the limiting reactant if 4 mol of oxygen reacts with 16 mol of hydrogen? b.What amount (in moles) of water is produced in this reaction? 2) . Sliver

*asked by IMPO QUESTION on December 19, 2012* -
## Microeconomy

uppose the demand for these jets is given by the equation: P = 3000 - Q, where Q denotes the quantity of jets, and P denotes its price. So that the marginal revenue facing the firm is: MR = 3000 - 2Q. The marginal cost of Lockheed Martin is given by the

*asked by Ann on May 24, 2013* -
## chemisrty

Q4) Suppose you prepare 950 mL of a solution by dissolving 100 grams of NaCl in 900 mL of water. Assuming the density of pure water to be 1 g/mL, answer the following questions with regards to this solution: a) What is the mass percent of water in this

*asked by lyan on January 16, 2012* -
## physics

A pistol is fired horizontally and the bullet has a muzzle velocity (speed with which the bullet leaves the barrel) of 31.3 m/s. The gun is 50 m above the surrounding terrain. a) How far away does the bullet land measured horizontally from a point directly

*asked by Xin Zhang on March 7, 2012* -
## Chemistry

An aqueous KNO3 solution is made using 73.4g of KNO3 diluted to a total solution volume of 1.86 L. Calculate the molarity of the solution. (Assume a density of 1.05 g/ml for the solution.)

*asked by Anna on January 29, 2013* -
## chem

You have a large amount of 7.50M stock solution. You need 1.80L of 3.00M solution for an experiment. How would you prepare the desired solution without wasting any stock solution?

*asked by chemdummy on November 8, 2012* -
## Math

Use the quadratic formula to solve each of the following quadratic equations... 1. 2x^2-5x=3 2. 3x^2-2x+1=0 Rearrange the equation in quadratic formula form. 2x^2 -5x -3 = 0 Then use the formula. Tell me what you don't understand about it if you don't know

*asked by Tomika on June 13, 2007* -
## Maths

use the formula cos(x+iy)=cosxcosiy-sinxsiniy to find two imaginary numbers whose cosine is 3 cos(x+iy)=cosxcosiy-sinxsiniy = cos(x)cosh(y) - i sin(x)sinh(y) = 3 Equating imaginary parts gives: sin(x)sinh(y) = 0 You know that y cannot be zero, otherwise

*asked by Tom on January 21, 2007* -
## math

Question-2; Consider the function f(x)= -cos3x -4sin3x. (a)Find the equation of the line normal to the graph of f(x) when x= pie/6 . (b)Find the x coordinates of the points on the graph of f(x) where the tangent to the graph is horizontal. (c)Find the

*asked by weloo_volley on April 21, 2012* -
## math

which of these numbers can be classified as both rational and real? a. 1/2 b. -1.016879413894 c. square root of 5 d. 0.89089908999 which is both a real number and an integer? a. square root of 7 b. 0.15 c. -15 d. 1/3 what is an example of an irrational

*asked by lol on September 27, 2017* -
## chemistry

You were given 25.00 ml of an acetic acid solution of unknown concentration. You find that it requires 29.60 ml of a 0.1050 M NaOH solution to exaclty neutralize this sample. A) What is the molarity of the acetic acid solution? B) what is the percentage of

*asked by Rema on October 20, 2011* -
## Algebra Word problem

Suppose you are an event coordinator for a large performance theater. One of the hottest new Broadway musicals has started to tour, and your city is the first stop on the tour. You need to supply information about projected ticket sales to the box office

*asked by Michelle on February 14, 2010* -
## Math (Calculus II) (Weird Work Problem Setup Help)

I am trying to understand my teacher's example of a Work problem. Cut to the chase here's a picture of the problem: goo.gl/photos/AqZ6ENmHLg6heixD7 While I understand how to integrate fairly well, I'm still confused on how exactly my teacher set up the

*asked by Ray on May 15, 2017* -
## Algebra

For what real number k does the product (25 + ki)*(3+2i) equal a real number?

*asked by XXX on June 16, 2015* -
## Math

Let the function a@b be defined as 3a + 2b for all real numbers a and b. If u and v are real numbers for which u@v =v@u = 20, what is the value of 2u@3v?

*asked by Isabelle on January 8, 2017* -
## physics

The characteristics of a horizontal and undamped spring-block system are k=400N/m and M=0.3kg.The position of the block is determined by its abscissa along an x'ox axis. When the spring has its natural length then x=0. a) the spring is stretched by

*asked by vicky on October 21, 2016* -
## AP Chemistry

My objective is to find the molar mass of a gas. Is this the correct balanced equation for magnesium ribbon reacting with hydrochloric acid to form hydrogen gas? 2Mg (s) + 2HCL (l) ----> H2 (g) + 2MgCl (aq) Also, I'm required to find the mass of the

*asked by Jake on September 23, 2007* -
## CHEMISTRY

n unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52 . 5 mL of 6 M HCl. Calculate the concentration of the di- luted NaOH solution. Answer in units of

*asked by Maria on October 18, 2013* -
## chemisry

An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the di- luted NaOH solution. Answer in units of M

*asked by cheri on September 19, 2012* -
## AP Chemistry

An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M

*asked by Gabriella on September 11, 2013* -
## chemistry

The administration of 100mg or more of morphne (molar mass 283) to a patient would be lethel. which of the following would you consider to be a safe dose. a. 100ml of a 20 percent solution (w/v) b. 50ml of a 2 M solution c. 25ml of a 10g/100ml solution d.

*asked by tal on May 14, 2014* -
## Math

Im really struggling with these proving identities problems can somebody please show me how to do these? I'm only aloud to manipulate one side of the equation and it has to equal the other side of the equation at the end Problem 1. Sinx/(cotx+1) +

*asked by Alycia on November 1, 2012* -
## Math

(1 & 2) The first three points do not fall on a straight line, and there is no value of k that will make that happen. (4) To find the quadratic y = a x^2 + bx + c that passes through the first three points, solve simultaneously 1 = c 3 = 4a + 2b + c 6 = 16

*asked by drwls on December 25, 2006* -
## Chemistry

Hydrazine, N2H4(aq), is used in the preparation of polymers, pharmaceuticals and rocket fuel. Hydrazine has alkaline properties similar to ammonia and will act as a weak base. Given that a 100 mL sample of 0.10 mol/L hydrazine solution has a pH of 10.55 at

*asked by Emily on May 23, 2018* -
## Chemistry (PLZ HELP)

Hydrazine, N2H4(aq), is used in the preparation of polymers, pharmaceuticals and rocket fuel. Hydrazine has alkaline properties similar to ammonia and will act as a weak base. Given that a 100 mL sample of 0.10 mol/L hydrazine solution has a pH of 10.55 at

*asked by Emily on May 23, 2018* -
## chemistry

You need to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. You have a 0.1896 M standard solution. You take a 25.00 mL sample of the original acid solution and dilute it to 250.0 mL. You then

*asked by Steven on April 11, 2014* -
## physics (3 separate questions)

1. The motion of a body is described by the equation ay = −308y. (a) Find the angular frequency. (b) Find the frequency. (c) Find the period. 2. A 2.10 kg mass attached to a spring oscillates with a period of 0.395 s and an amplitude of 20.5 cm. (a) Find

*asked by Anonymous on March 28, 2011* -
## chemistry

Write the balanced net ionic equation for each of the following: 1) The reaction of dilute nitric acid with solid aluminum oxide. 2) The reaction of nitrous acid (HNO2) with potassium permanganate to produce nitrate and Mn(II) ions. Thanks for any help.

*asked by ally on September 18, 2006* -
## English

The children were ________ excited when they heard they made the team; they jumped up and down ________. a) real/noisy b) really/noisy c) real/noisily d) really/noisily Answer D

*asked by Abby on January 8, 2019* -
## Economics

Concern about international crisis has caused consumers to save their money and postpone big purchases. What is the effect on aggregate demand and aggregate supply? A. No change B. Aggregate supply will decrease, raising the price level and lowering real

*asked by Codey on May 31, 2011* -
## physics

2) A proton is moving parallel to a uniform electric field. The electric field accelerates the proton and increases its linear momentum to 8.6 x 10^-23 kg·m/s from 2.4 x 10^-23 kg·m/s in a time of 5.7 x 10^-6 s. What is the magnitude of the electric

*asked by Kevin on September 14, 2006* -
## Pre-Calculus

The Gateway Arch in St. Louis, Missouri is not a parabola but a shape known as a catenary. The name is given to the shaoe formed by the Graph of the hyperbolic cosine (cosh). The arch has a height of 625 feet andna span of 600 feet. The hyperbolic cosine

*asked by Guadalupe on February 10, 2015* -
## biochem

If 10mL of 1 M HCl is added to 1L of 0.01 M phosphate buffer, pH 7.2, what is the resulting pH? Also what are the conc of H2PO4^1- and HPO4^2- in the final solution? HCl: M = mol / L 1M = mol / 0.01L = 0.01 mol phosphate: M = mol / L 0.01M = mol / 1L =

*asked by Liam on June 2, 2018* -
## physics

A projectile of mass m moves to the right with a speed vi. The projectile strikes and sticks to the end of a stationary rod of mass M, of length d, that is pivoted about a frictionless axle through its center. (a) Find the angular speed of the system right

*asked by jack on April 6, 2009* -
## AP Physics

A ball is kicked 30º above the horizontal with an initial velocity of 20m/s. A fence 2.3 meters high is located 32 meters away. a. How long does it take to reach the fence? b. Does it goes over the fence? Does it hit the ground before? By how much? I

*asked by Jessica on October 24, 2015* -
## Physics

Two students are on a balcony 19.6 m above the street. One student throws a ball vertically downward at 14.7 m/s. At the same instant, the other student throws a ball vertically upward at the same speed. The second ball just misses the balcony on the way

*asked by Becca on September 25, 2006* -
## algebra

Maurice drove 400 km from Edmonton to Battleford in 1 hour less time than it took Martin to drive the same route from Battleford to Edmonton. If Maurice drove 20 km/h faster than Martin, at what speed did each of them drive? Show a complete algebraic

*asked by Shay on February 12, 2007* -
## Chemistry 102

For a question like “calculate the pH of an aq.solution that is 1.0 M CH3COOH and 1.0 M CH3COONa, how do you know to write the equation like this: CH3COOH + H2O => H3O+ + CH3COO- and not like H3O+ + CH3COO- => CH3COOH + H2O for the ICE chart. This would

*asked by Nick on May 3, 2010* -
## chemistry

The equilibrium constant Kc for the reaction C D + E is 7.90 * 10^-5. The initial composition of the reaction mixture is [C]=[D]=[E]=1.10*10^-3. What is the equilibrium concentrations of C, D, and E? C=? D=? E=? chemistry - DrBob222, Monday, November 5,

*asked by Brunette on November 5, 2012* -
## managerial economics

4. The equation for a demand curve has been estimated to be Q = 100 – 10P + 0.5Y where Q is quantity, P is price, and Y is income. Assume that P = 7 and Y = 50. a. Interpret the equation. b. What is price elasticity at P = 7 and arc elasticity at the

*asked by Anonymous on March 11, 2012* -
## Chemistry

24.0 mL of 2.4 M silver nitrate is mixed with 32.0 mL of 2.0 M sodium chloride. ( I wrote the balanced equation as AgNo3+NaCl -> NaNo3 + AgCl ) A) Identify the precipitate formed by name and formula. - I wrote AgCl (silver chloride) B) Calculate the mass

*asked by Sara on March 2, 2016* -
## math

A pharmacist wishes to mix a solution that is 6% Minocidil. She has on hand 60 ml of a 3% solution and wishes to add some 8% solution to obtain the desired 6% solution. How much 8% solution should she add?

*asked by Hali on January 17, 2012* -
## Algebra

Joanie takes a $6000 loan to pay for her car. The interest rate on the loan is 12%. She makes no payments for 4 years, but has to pay back all the money she owes at the end of 4 years. How much more money will she owe if the interest compounds quarterly

*asked by Cassie on April 1, 2009* -
## Maths!! Sinusoidal!

1.Jim and Chana are riding the Ferris wheel like the one diagrammed here. It is supported on a triangular base having a bottom of 18.460m and sides of 14.359m. During the ride Jim observed Chana, while Chana observed that at the bottom of the ride she

*asked by Moe on July 25, 2014* -
## College Physics- buoyancy problem

To an order of magnitude, how many helium-filled toy balloons would be required to lift you? Because helium is an irreplaceable resource, develop a theoretical answer rather than an experimental answer. Assume that you have a mass of approximately 70 kg,

*asked by Dumb Student on November 22, 2015* -
## equations

I am not great at equations... I keep practicing and working these problems and questions out but I always seem to get different answers can someone please guide me on how or tell me the correct way to work these problems out>> The linear equation y=0.15x

*asked by Anna on October 25, 2009* -
## equations

I am not great at equations... I keep practicing and working these problems and questions out but I always seem to get different answers can someone please guide me on how or tell me the correct way to work these problems out>> The linear equation y=0.15x

*asked by Anonymous on October 25, 2009* -
## CHEMISTRY

pH= 7.44 What is the ratio of [H2PO4^-]/[HPO4^2-] What does the pH become if 25% of the hydrogen phosphate ions are converted to the dihydrogen phosphate ion? What does the pH become if 15% of the dihydrogen phosphate ions are converted to hydrogen

*asked by Delli on May 10, 2007* -
## Science

1. Rewrite the word equation as formula equation: Aluminum + copper (II) chloride= aluminum chloride + copper 2. What is not equal in these chemical formula equations: a.) magnesium + oxygen = magnesium oxide B.) water = hydrogen + oxygen c.)methanol

*asked by Madhu on March 30, 2014* -
## Physics

A horizontal water pipe goes from a large diameter to a small diameter and then back to the first diameter as shown in the figure below. The level of water (8cm in the larger tube and 4 cm in the constricted tube) in the small vertical tubes provides us

*asked by Anna on December 4, 2015* -
## Chemistry

Radium-223 nuclei usually decay by alpha emission. Once in every billion decays, a radium-223 nucleus emits a carbon-14 nucleus. Write a balanced nuclear equation for alpha emission. Write a balanced nuclear equation for carbon-14 emission.

*asked by mark on April 7, 2016* -
## Chemistry

Radium-223 nuclei usually decay by alpha emission. Once in every billion decays, a radium-223 nucleus emits a carbon-14 nucleus. Write a balanced nuclear equation for alpha emission. Write a balanced nuclear equation for carbon-14 emission.

*asked by Josh on April 8, 2016* -
## Chemistry

(a) Calculate the molarity of a solution that contains 0.175 mol ZnCl2 in exactly 150 mL of solution. (b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid? (c) How many milliliters of 6.00 MNaOH solution are needed to

*asked by Anon on October 31, 2011* -
## math formulas needed

Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on a scatter diagram. (Do

*asked by Tom 12 on June 18, 2013* -
## chemistry

the density of a certain aqueous solution is 1.17g/ml, and the solution is 3.57% by mass NaOH. how many mL of this solution would you need to use in order to prepare 100.0 mL of .150 M NaOH solution?

*asked by zahra on September 6, 2010* -
## Honors Chemistry

An aqueous solution of NaCl has a concentration of .500 M. 35.0 mL of this solution is allowed to evaporate to a volume of 20.0 mL. a) Is the solution more concentrated or more dilute afterwards? b) What is the new concentration of the solution?

*asked by Lou on May 4, 2012*

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