# 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 344-
## Preap Physics!!

Is gravitational potential energy different from potential energy?? Because I know gravitational potential energy's equation is PE=mass(gravity)(height)

*asked by Jaeka on January 11, 2011* -
## algebra

If my equation that I wrote does it matter how it is written. Does it matter if I write it' $200+$50h=c or c=$200+$50h or c=$50h+200

*asked by Sylvia on March 15, 2011* -
## help

a 2-mi cab ride costs $4.25. a 7-mi cab ride costs $8.50. which equation models the cost y of a cab ride that is x miles?

*asked by Anonymous on May 21, 2013* -
## Math-Linear Equations

Please let me know if I understand this correctly. Find the slope and the y-intercept of each equation: 1)y-9x= 1/2 +9x= 1/2 + 9x y= 1/2 + 9x slope:9; y-intercept: 1/2 2)2y-6=3x +6 +6 2y=3x + 6 - - 2 2 so then: y=3x+3 3) -2y=6(5-3x) -2y= 30-18x - -- -2 -2

*asked by Kate on January 16, 2012* -
## math

1. The x-intercept of the line is -3. The y-intercept of the line is 6. What us the slope of the line? 2. What is the equation in slope-intercept form of the linedescribed in Exercise 1?

*asked by xxx on April 29, 2009* -
## Math

Johnny has 30 marbles. Mark has m marbles, if Johnny has 10 times as many as mark, write an equation that shows how many marbles mark has.

*asked by Norm on January 21, 2017* -
## ordinary differential equation

A contains 200 liters of solution in which is dissolved 40 kg of salt. Tank B contains 400 liters of solution in which are dissolved 80 kg of salt. Pure water flows into tank A at rate of 10 liters per second. There is a drain at the bottom of tank A.

*asked by thigan on May 21, 2016* -
## 1 chem question

A base has a Kb of 2.5 x 10–11. Which of the following statements is true? This is a concentrated base. This base ionizes slightly in aqueous solution. This is a strong base. An aqueous solution of this base would be acidic. (do explain. i don't

*asked by Sara on February 14, 2012* -
## physics

A train moving at a constant speed is passing a stationary observer on a platform. a flute player is playing a note with frequency of 940Hz. after the flute has passed, the observer hears the sound frequency of 915Hz. What is the speed of the train? The

*asked by John on December 9, 2014* -
## chemistry

What is the standard entropy of reaction, the standard entropy of reaction, in J/K, for the combustion reaction of ethylene described in the previous questions? The temperature is 298.15K. (Enter your answer as a signed number in scientific notation

*asked by bekah on April 24, 2014* -
## Chemical Oceanography

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline

*asked by josh on April 22, 2010* -
## Physics

A solid ball and a hollow ball, each with a mass of 2 kg and radius of 0.1 m, start from rest and roll down a ramp of length 2 m at an incline of 34°. An ice cube of the same mass slides without friction down the same ramp. What is the speed of the solid

*asked by James on June 18, 2012* -
## physics

The period of a satellite is the primary way that the mass of planets is determined. The equation used for this calculation uses the fact that gravity of the planet provides the centripetal force to keep the satellite in orbit. The distance from the Earth

*asked by ck on November 23, 2010* -
## chemistry

Write the half reaction and balanced equation for: Cl2(g) + H2(g) -> HCl(aq) so I got: 2e- + Cl2(g) -> 2Cl- H2(g) -> 2H+ + 2e- so Hydrogen is oxidized and Chlorine is reduced so for cell notation I put: Pt(s)|H2(g)|H+(aq)||Cl2(g)|Cl-(aq)|Pt(s) but the

*asked by Hugh on May 19, 2013* -
## algebra 2

Science and medicine. Find the time required for an object to fall to the ground from a building that is 1400 ft high. using the formula : t = 1/4 radical (s) t=1/4 radical 1400 t= 10 radical 14*1/4 t= 5 radical 14 /2 what are I doing wrong I am suppose to

*asked by Tom on May 11, 2007* -
## Chemistry

Based on the following observations for 3 unidentified metals (Z, X, and D) and solutions of their metal cations (Zn+ and En+), rank the metals in terms of reducing agent strength, from lowest to highest. -When metal X is placed in an aqueous solution of

*asked by Nathaly on April 2, 2017* -
## algebra

during the lunvh rush the catch of the day is ordered 24 times if the number of catch if the day orders represents 2/9 of the total lunch orders x which equation could be used to determine the number of lunch orders taken that day

*asked by destiny on June 25, 2014* -
## Algebra

Could you please check some of my Algebra problems please? Write the standard form of the equation of the circle with the given center and radius. 1. (-7,4);8 I got (x+7)^2 + (y-4)^2=64 2. (-7,10); square root of 17 I got (x+7)^2 + (y-10)^2=17 3. (0,0); 2

*asked by Soly on September 10, 2007* -
## Analytic Geometry

A circle at the origin whose is 2 units is 2 is inscribed in a right triangle whose base is 8 units and altitude 6 units. Find a) The equation of the circle b)The area and circumference of the circle c)The area of the right triangle exluding the area

*asked by Jnr John on August 11, 2014* -
## math

The Randolphs used 12 more gal of fuel oil in October than in September and twice as much oil in November as in September. If they used 132 gal for the 3 months, how much was used during each month? Let x = the gallons of fuel oil used in September, and

*asked by karen on June 29, 2007* -
## Math

A student collects 12 ladybugs for a science project. This is nine fewer than the number of ladybugs the student collected yesterday. Write and solve an equation to find the number of ladybugs the student collected yesterday.

*asked by Anonymous 🧸 on November 28, 2018* -
## MATH

For a bake sale Yolanda made 3 less than 5 times as many loaves of bread as her brother, Xander. If Y is the number of loaves Yolanda made and x os the number os loaves Xander made, which equation shows this relationship? A) Y=5x-3 B)Y-3=5x C)Y=5+x-3

*asked by Daylon on December 30, 2011* -
## chemistry

The energy levels the electron can occupy in the Be3+ ion can be calculated using the energy level equation. A Be3+ ion with an electron in the n= 3.00 level emitted a photon with a frequency of 7.30 × 1015 Hz. What is the value of the level n for the new

*asked by mike on January 30, 2012* -
## math

For a bake sale Yolanda made 3 less than 5 times as many loaves of bread as her brother, Xander. If Y is the number of loaves Yolanda made and x os the number os loaves Xander made, which equation shows this relationship? A) Y=5x-3 B)Y-3=5x C)Y=5+x-3

*asked by Daylon on December 29, 2011* -
## math

On a class trip there wre 30 more girls than boys.The total number of students on the trip was 210.Write and solve an equation to find the number of girls and the number of boys on the class trip.

*asked by ashley on January 28, 2014* -
## Chemistry

When a clear aqueous solution of calcium chloride (CaCl2) is mixed with a clear aqueous solution of sodium carbonate (Na2CO3), a white solid precipitate forms. What happens to the mass of the mixture after the solid precipitate forms? Choose the best

*asked by Lily on September 25, 2012* -
## MATH; linear equation?

radius; another word for the bone that connects the elbow and wrist. don't get this confused with the radius of a circle, this has NOTHING to do with that... A woman with an arm radius of 22 centimets long should be about 160 centimeters tall. A woman with

*asked by amazinggg on January 9, 2008* -
## Physics

Two hockey players traveling at 12 m/s (Player #1) and 19 m/s (Player #2) hit in a head-on collision. They grab onto each other to keep from falling and slide in the same direction Player #2 was traveling at a speed of 5 m/s. Player #1 has a mass of 100

*asked by Hannah on October 21, 2014* -
## Biochemistry

On preparation of a solution of protein, you attempted to dissolve the substance in water, but a suspension resulted. Drop-wise adition of NaOH solution, with stirring, eliminated the suspension. Addition of acid to the original suspension had no effect.

*asked by Andrew on January 25, 2009* -
## (Math) PLZ CHECK ANSWERS

1. Which number is a solution of the inequality? 10.68 A)-5 B)-6 C)6 D)7*** 3. Which number is a solution of the inequality? 6>z(10-z) A)0 B)1 C)2 D)3*** 4. What are all the subsets of the set? {-1,9} A) 0, {-1}, {9}*** B) {-1}, {9}, {-1, 9} C) 0, {-1},

*asked by Katrina on October 28, 2016* -
## Macroeconomics

The “Great Moderation” since 1985 could be due either to smaller demand stocks when compared to the period prior to 1985 or to a better response by monetary policymakers since 1985 to the same demand shocks that occurred prior to 1985. Evidence to

*asked by Anonymous on December 6, 2008* -
## religion

Since the imagination of evil encourages us to do real evil, how should we react to accounts from the media or elsewhere about monstrous evil in our neighborhood or elsewhere in the world?

*asked by riley on November 26, 2007* -
## Trigonometry

determine real numbers a and b so that the expression 8sin^2(theta) + 2cos^2(theta) can be rewritten as asin^2(theta) + b I just need help in how to start it.

*asked by Andres on August 28, 2011* -
## English

In the Adventures of Huck Finn DISCUSS TOM'S RESPONSE WHEN THE REAL TOM SAWYER ARRIVES. WHO DOES TOM PRETEND TO BE?

*asked by Pia on February 2, 2013* -
## Chemistry

Urea, which has the chemical formula (NH2)2CO, is a fertilizer that can be prepared by reacting ammonia (NH3) with carbon dioxide (CO2). Given the following chemical equation, what is the theoretical yield of urea (in grams) if 4.16 mol ammonia is the

*asked by Jacob on March 4, 2017* -
## Algebra

The bicyclists were 300 miles apart at 3 p.m. and were headed toward each other. If they met at 9 p.m. and one was traveling 20 mph faster than the other, what was the speed of each bicyclist? So far these are the equations I have gotten: Distance1 +

*asked by Alyonka on July 25, 2012* -
## Chemistry

The mineral cassiterite is a compound of tin and oxygen. Chemical analysis of cassiterite shows that the mass percentages of tin, Sn, and oxygen, O, are 78.8% and 21.2%, respectively. Determine the formula of this compound. I found the molar mass and

*asked by Jordan on August 30, 2015* -
## chemistry class

i have a Chemistry lab (level 2) final exam soon. our teacher told us that we would have % transmittance problems, can someone show me an examples (maybe from an online test) or a made up one, of what i might expect to find on my chemistry lab final? like

*asked by jes on December 1, 2010* -
## Algebra

The cost, in millions, to remove x% of pollution in a pond is modeled by the equation: C=6350/(425-3x) . What is the cost to remove 75% of the pollution? Hint: Plug in and calculate, do not convert to a decimal. Can someone tell me how figure this out step

*asked by becca on December 15, 2011* -
## Chemistry

Calculate the number of moles of KIO3 consumed by reaction (2.1). Remember, it is the limiting reagent. Using this information, calculate the number of moles of I- that must have been consumed by reaction. Unbalanced equation: IO -(aq) + I-(aq) + H+(aq) ÿ

*asked by senko on October 14, 2012* -
## Chemistry

In the synthesis of asprin we react salicylic acid (HOOCC6H4OH) with acetic anhydride (C4H6O3) . The unbalanced chemical equation is: HOOCC6H4OH + C4H6O3 --> HOOCC6H4O2C2H3 + H2O If we mix together 28.2 g of salicylic acids with 15.6 g of acetic anhydride

*asked by Lindsay on September 24, 2017* -
## Math

HELP! i have no idea how to do this! A rabbit population satisfies the logistic equation dy/dx=2x10^7y(10^6-y), where t is the time measured in months. The population is suddenly reduced to 40% of its steady state size by myxamatosis. If the myxamatosis

*asked by Bianca on May 24, 2012* -
## Chemistry(check my work)?

An equilibrium mixture of the following reaction was found to have [COF2] = 0.255 M and [CF4] = 0.118 M at 1000°C. What is the concentration of CO2? 2 COF2(g) ---> CO2(g) + CF4(g) Keq = 2.00 at 1000°C I know I need to put the numbers in the equation so

*asked by Rachel on April 17, 2011* -
## algebra

Marvin is comparing two different music websites. Website A charges $10 per month for a subscription and $0.25 per song. Website B has no subscription fee, and all songs cost $0.75. Which equation would you solve to find the number of songs, s, that Marvin

*asked by ever on June 18, 2018* -
## Math

A ball is dropped from a height of 36 feet. The quadratic equation d=1/2 gt^2 is used to calculate the distance (d) the ball has fallen after t seconds. The constant g is the acceleration of gravity, 9.8m/s^2. How long does it take the ball to hit the

*asked by Lux on November 19, 2012* -
## chemistry lab

Insert your values for x, y, z, & n into KxFey(C2O4)z·nH2O and provide the correct coefficients to balance the following equation: ___ Fe(NH4)2(SO4)2·6H2O + ___ H2C2O4 + ___ K2C2O4 + ___ H2O2 ___ KxFey(C2O4)z·nH2O + ___ (NH4)2SO4 + ___ H2SO4 + ___ H2O

*asked by anonymous on April 30, 2010* -
## MATH

I really don't know how to do this, need as soon as possible. Please help! A rabbit population satis es the logistic equation dy dt = 2x10^-7y(10^6- y); where t is the time measured in months. The population is suddenly reduced to 40% of its steady state

*asked by Lilly on May 25, 2012* -
## chemistry

When cane sugar reacts with oxygen in living systems, carbon dioxide and water are produced. What weight of carbon dioxide can be produced from the reaction of 15.0 grams of cane sugar with 15.0 grams of oxygen? (Hint: balance the equation) ___C12H22O11(s)

*asked by Brittney on October 9, 2013* -
## MATH

Exercise:- A new flag design. The flag measures 100cm by 90cm. The flag consists of a red cross with a white background. The thickness of the vertical strip is twice that of the horizontal one. The area of the cross is half the area of the flag. By making

*asked by Mhon on July 4, 2016* -
## Algebra

Please check my answers. Thanks! Solve the polynomial equation. In order to obtain the first root, use synthetic division to test the possible rational roots. 5.2x^3-13x^2+22x-8=0 -My answer:{1/2,2,4} 6.x^3-8x^2-x+8=0 -My answer: {1,-1,8} Find the rational

*asked by Jes on October 9, 2007* -
## Math PLEASE HELP ASAP

I really don't know how to do this, need as soon as possible. Please help! A rabbit population satis es the logistic equation dy dt = 2x10^-7y(10^6- y); where t is the time measured in months. The population is suddenly reduced to 40% of its steady state

*asked by Lilly on May 26, 2012* -
## Geometry

when you have a graph with just dots and the dots make a figure. Then the dots on the outside are the posts and the inside dots are trees. what equation can i use to get the area of the figure using only posts and trees?

*asked by Cheyenne on October 18, 2010* -
## precalc

Find the standard form equation for each ellipse described. 1) Major vertices at (0, 3) and (0, -3), minor vertices at (2, 0) and (-2, 0) 2) Major vertices at (7, 0) and (-7, 0), foci at (5, 0) and (-5, 0) 3) Minor vertices at (-2, -3) and (-2, -11), foci

*asked by jean on December 8, 2015* -
## Math

Let line l_1 be the graph of 5x + 8y = -9. Line l_2 is perpendicular to line l_1 and passes through the point (10,10). If line l_2 is the graph of the equation y=mx +b, then find m+b.

*asked by Alex on September 4, 2017* -
## algebra

Write a formula to express the following sentence as an equation: The sale price us 25% off the original price. Use S for sale price and P for original price to express S as a function of P.

*asked by Janice on August 31, 2014* -
## Math

The equation of a curve is y = 2x^3 + 3x^2 Find: x-intercept of the curve y-intercept of the curve b) Determine the stationery point of the curve. i) for each point in(b) above, determine whether it is a maximum or a minimum

*asked by Kiff on June 5, 2018* -
## math

The formula F = 1.8°C + 32 allows you to find the Fahrenheit (F) temperature for a given Celsius (C) temperature. Solve the equation for C to produce a formula for finding the Celsius temperature for a given Fahrenheit temperature. THANK YOU!

*asked by kimie on November 11, 2015* -
## Math! Please Help It's Due Today!!!!!

Let line l_1 be the graph of 5x + 8y = -9. Line l_2 is perpendicular to line l_1 and passes through the point (10,10). If line l_2 is the graph of the equation y=mx +b, then find m+b.

*asked by Alex on September 4, 2017* -
## physics help 2 please!!

Mass A (7 kg) and mass B (10 kg) sit on the ground, 2 m apart. a.) What is size of the the gravitational force: on A from B? N on B from A? N b.) What is the size of the gravitational force: on A from the Earth? N on B from the Earth? N once again, i am

*asked by kelsey on October 31, 2008* -
## stats

Find the explained variation for the paired data. The equation of the regression line for the paired data below is y-hat = 3x. Find the explained variation. x= 2 4 5 6 y= 7 11 13 20

*asked by bre on May 22, 2015* -
## Finance

Use the “balance sheet equation” to determine owners’ equity if liabilities are $5 million and assets are $10 million. Assets = Liabilities + Owners’ equity

*asked by Jason on March 2, 2013* -
## Chemistry

Find the mininum ammount of 5.0 M HNO3 needed to dissolve 2.72 g of Cu (s). I have the balanced equation here: 2NO3-(aq)+8H+(aq)+3Cu(s)-->2NO(g)+4H2)(l)+3Cu2+(aq) Obviously it is a 2 moles NO3- to 3 moles of Cu (s) ratio. I converted grams Cu to moles

*asked by Phat Pat on May 7, 2010* -
## Algebra

- ok... we keep getting this one wrong: Solve the following equation for x. Write your answer as a fraction in simplest form. -6(x-5)=-2x-8-6(3x-5) What is it you don't understand about this? Clear the parentheses, combine terms, solve for x. Ive been

*asked by Briana on January 21, 2007* -
## Math 1350

One rectangular table seats three people along each side and two people are seated at each end. The tables are place end-to-end in one long line. Draw a series of pictures that will help you find a pattern to predict how many tables will be needed to seat

*asked by Ne Ne on October 26, 2015* -
## Chemistry

When .560 g of Na(s) reacts with excess F2(g) to form NaF(s), 13.8 kJ of heat is evolved at standard-state conditions. What is the standard enthalpy of formation of NaF(s)? Start off by balancing the equation: 2Na(s) + F2(s) ---> 2NaF(s) Then make it for

*asked by AJ on March 26, 2017* -
## Shear Modulus

Hi there, quick question: How would you find the shear modulus of a ruler (plastic 12 in)? I don't exactly get it. You have to bend it which will help you...??? -Thanks! Bending it like a beam, or measuring its vibrational frequency when clamped at one

*asked by Ted on November 29, 2006* -
## MAT 117 - ALGEBRA 2

The costs of doing business for a company can be found by adding fixed costs, such as rent, insurance, and wages, and variable costs, which are the costs to purchase the product you are selling. The portion of the company’s fixed costs allotted to this

*asked by Anonymous on July 26, 2011* -
## economics

there are just certain things that i do not understand about the questions...(i did read A LOT last night and i did not find anything that really answered my questions)...To be more specific... suppose a competitive market consists of identical firms with

*asked by michele on September 21, 2007* -
## math

A square martix A is said to be idempotent if A=A^2. The only real numbers that are idempotent are 1 and 0, but this is not true for martices. Find a 2x2 idempotent other than 1 or 0.

*asked by jim on November 25, 2010* -
## Calculus

Which of the following integrals can be integrated using partial fractions using linear factors with real coefficients? a) integral 1/(x^4-1) dx b) integral (3x+1)/(x^2+6x+8) dx c) integral x^2/(x^2+4) d) None of these

*asked by Alice on April 7, 2019* -
## Algebra

All real # x and y that satisfy -2x-1+2yi=4x-5i first step is place constant complex # on one side -2x+2yi-4x=1+5i -6x+2yi=1+5i now I'm lost

*asked by Terri on October 23, 2013* -
## Physics

An object is 3 cm tall is placed 24 cm from a converging lens.a real image is formed 8 cm from the lens.the focal length of the lens is

*asked by Swaleh on November 30, 2016* -
## social sciences

The market supply for potatoes in New York is 2,000 tons for a price of $200 a ton, and 5,000 tons for a price of $500 a ton. Between these two prices market supply is a straight line. What is the equation of the supply curve?

*asked by Joe on October 2, 2012* -
## MATH

system of linear equation The sum of 3 numbers is 14 the largest is 4 times the smallest the sum of the smallest and twice the largest is 18 what are the 3 numbers? show work? A. how many unknowns you have? -how many equations need to be solve for that

*asked by YANETH on November 1, 2011* -
## maths(urgent)thanks.

a parabola with turning point at (1,-2) and passing through the origin.find the equation of this parabola. how do i do this? can someone please show me how to solve it step by step?thanks! You know that at x = 0 the function is zero. Because the turning

*asked by Emma on May 30, 2007* -
## HS Science

I have 4 questions 1 What is the equation for the acid ionization constant of HI? 2 Give the oxidation numbers of all atoms in NaMnO4 3 An atom changes its oxidation number from -2 to -5. Is it oxidized or reduced? How many electrons did it take to do

*asked by Ashley on June 30, 2011* -
## Physics

Question: A 0.200kg ball moves with a velocity of 0.3m/s. It collides with a second ball that is at rest and has a mass of 0.1kg. After the collision, the velocity of 0.1kg ball is 0.26m/s. What is the new velocity of the first ball. Please indicate which

*asked by Tina on June 26, 2011* -
## Chemistry

Please Help!! I don't know how to balance this redox equation! I've been trying to solve this for hours and I'm getting nowhere Fe(s) + HClO4 (aq) --> H (g) + FeClO4 I tried balancing and I got these Fe(s) + HClO4 (aq) --> H2 (g) + Fe(ClO4)3 and 2Fe(s) +

*asked by Janie_ on October 10, 2014* -
## Math

So Prize money of $500 is divided between Alan & Jim so that Alan receives $170 more than Jim How much does each receive ----- Using one variable:: Let Jim have "x" Then Alan has "x+170" ---- Equation: x + x+170 = 500 2x = 330 x = $165 (Jim's share) x+170

*asked by Jeremy on March 28, 2016* -
## chemical equations

How do I write the chemical equation for Copper(II)nitrate + sodium hydroxide -> Copper(II)hydroxide + sodium nitrate? CuNO3 + NaOH-> CuOH + Na(NO3) is that right? Copper(II)hydroxide -> Copper(II)oxide + water CuOH -> CuO + H2O?

*asked by Anonymous on November 30, 2014* -
## College algebra

system of linear equation The sum of 3 numbers is 14 the largest is 4 times the smallest the sum of the smallest and twice the largest is 18 what are the 3 numbers? show work? A. how many unknowns you have? -how many equations need to be solve for that

*asked by YANETH on November 1, 2011* -
## Math

Monica wants to know what she needs to get on the exam to get a certain grade in her English class. The term Mark is worth 70% of the course and exam is worth 30%. The following is the formula used to calculate her overall Mark. Course Mark = term Mark +

*asked by Emma on February 20, 2017* -
## Math Calculus

Suppose g(x) = 6x arctan (ln x/(x^3+2)) Plot y = g(x) in the square window deﬁned by 0 ≤ x ≤ 2 and −1 ≤ y ≤ 1. Also plot the secant lines connecting (1, g(1)) and (1 + h, g(1 + h)) for h = .5 and h = .25 in the same window. Give a table of

*asked by Anonymous on October 8, 2012* -
## Quadratic Functions3

The distance a car will skid after its brakes lock can be modelled by the equation d=kv^2, where d is the stopping distance in metres, k is a constant based on road conditions and v is the velocity of the car in metres per second at the moment the brakes

*asked by Heaven on June 1, 2016* -
## calculus

The marginal cost for a product is given by dC/dq = 1000/sqrt3q+20, in hundreds of dollars, where q is given in thousands of units. Determine the cost in dollars involved in increasing product from 10 to 15 thousand units. If R(0)= C(0)= 0, the marginal

*asked by Grant on May 14, 2013* -
## Physics Questions!

An interference pattern is set up by two point sources of the same frequency, vibrating in phase with one another. A point on the second nodal line is 50.0 cm from one source and 59 cm from the other. The speed of the waves is 35 cm/s. Calculate the

*asked by URGENT on December 15, 2007* -
## Calculus

The marginal cost for a product is given by dC/dq = 1000/sqrt3q+20, in hundreds of dollars, where q is given in thousands of units. Determine the cost in dollars involved in increasing product from 10 to 15 thousand units. If R(0)= C(0)= 0, the marginal

*asked by Grant on May 13, 2013* -
## MATHS (EQUATIONS)

A piece of stone loses its 1/5 th of weight when it is weighted in water and a piece of iron loses 1/10th of its weight under the same condition. The total weight of the both materials in air is 280grams and in water is 240 grams. Find the weight of both

*asked by A GOODSTUDENT on August 22, 2016* -
## physics # 7

7. An object falling in air experiences a drag force directly related to the square of the speed such that F = Cv2 (where C is a constant of proportionality). Assuming that the buoyant force due to air is negligible, the terminal velocity of this falling

*asked by gomez on August 7, 2007* -
## chemistry

Calculate deltaG from deltaH and deltaS. Use the table of standard thermodynamic data. calculate deltaG at 0 degrees C for CH3CH2CH3 + 5O2 --> 3CO2 + H2O. CH3CH2CH3 + 5O2 --> 3CO2 + 4H2O I've balanced the equation so far, I know that deltaG = delatH -

*asked by Bob on November 30, 2009* -
## Calculus

(It's a related rate question) A man 6ft tall walks away from a lamp post (15ft) at 5ft/sec. How fast is his shadow lengthening? --- I have the picture, and the constants, the man and the lamp post. I have 5ft/sec as dw/dt, and I know I'm looking for

*asked by Nikki on September 12, 2010* -
## Chemistry equation balancing

I have to balance the following equation using the lowest number of coefficients CH4 + NH3 + O2 -- HCN + H2O I can get N,C and O to balance as follows CH4 + NH3 + O2 -- HCN + 2H2O I can get H,C and N to balance as follows CH4 + NH3 + 2O2 -- HCN + 3H2O I

*asked by Anna on May 23, 2007* -
## chemistry

A sample of fresh grapefruit juice was filtered and titrated with the I2 solution prepared in Part 2. A 100.0 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch end point. What is the concentration of Vitamin C in 100ml juice?

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

Please answer asap with complete solution thanks a lot. I need the solution to answer other questions much alike to this one. :) Two electrons are 10^-15 meters apart. One electron is fixed on its position. The other, originally at rest, is released. How

*asked by Jezrell on July 3, 2012* -
## Chemistry

Hydroxylapatite, Ca10(PO4)6(OH)2, has a solubility constant of Ksp = 2.34 × 10-59, and dissociates according to Ca10(PO4)6(OH)2(s) --> 10Ca2+(aq) + 6PO43-(aq) + 2OH-(aq) Solid hydroxylapatite is dissolved in water to form a saturated solution. What is the

*asked by Angelyka on January 24, 2013* -
## quantitative chemistry

Consider a solution made by mixing 500.0 mL of 0.04182 M Na2HAsO4 with 500.0 mL of 0.03645 M NaOH. Complete the mass balance expressions below for Na and arsenate species in the final solution. There are 4 arsenate species, but I only got three of them. I

*asked by Jackie on March 22, 2013* -
## CHM 152

At 20oC, a 2.32 M aqueous solution of Ammonium Chloride has a density of 1.0344g/ml. WHat is the molality of Ammonium Chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol?? I am not sure how to incorporate the density into the problem to

*asked by Car on June 10, 2010* -
## chemistry

Consider a solution made by mixing 500.0 mL of 0.04182 M Na2HAsO4 with 500.0 mL of 0.03645 M NaOH. Complete the mass balance expressions below for Na and arsenate species in the final solution. There are 4 arsenate species, but I only got three of them. I

*asked by Jackie on March 23, 2013* -
## physics

Please answer asap with complete solution thanks a lot. I need the solution to answer other questions much alike to this one. :) Two electrons are 10^-15 meters apart. One electron is fixed on its position. The other, originally at rest, is released. How

*asked by Jezrell on July 3, 2012* -
## Algebra

Ann sells apples and Beth sells oranges. Today, half the number of apples than Ann sold was fifteen less than thrice as much the number of oranges that Beth sold. I just want it to know; how do I convert it into an algebraic expression or equation? Is

*asked by Joel on August 21, 2007*

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