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Questions Asked on February 19, 2013

Can someone check my answers on exploring conic sections?1. Graph x2 + y2 = 9. What are its lines of symmetry? Every line
1. 54 answers
2. asked by Lee
3. 26,276 views
A solution of H2SO4(aq) with a molal concentration of 8.01 m has a density of 1.354 g/mL. What is the molar concentration of
1. 5 answers
2. asked by Jhanvi
3. 13,410 views
Rearrange this expression into quadratic form, ax2 bx c = 0.2= ((x^2)/(55-x)) where a = 1, and identify the values of b and c.
1. 8 answers
2. asked by Anonymous
3. 11,409 views
Cliﬀ divers at Acapulco jump into the sea from a cliﬀ 37.1 m high. At the level of the sea, a rock sticks out a horizontal
1. 1 answer
2. asked by emma
3. 10,445 views
Heights of adult men have a mean of 69.0 inches and a standard deviation of 2.8 inches. Approximately what percentage of adult
1. 2 answers
2. asked by Theresa
3. 9,678 views
A loaded penguin sled weighing 60 N rests on a plane inclined at 20° to the horizontal. Between the sled and the plane the
1. 1 answer
2. asked by Rachel
3. 6,512 views
Find the exponential function f(x)=Ca^x whose graph goes through the points (0,3) and (2,12).
1. 1 answer
2. asked by Rachel
3. 6,214 views
At 25°C, Kp = 2.910−3 for the following reaction.NH4OCONH2(s) 2 NH3(g) + CO2(g) In an experiment carried out at 25°C, a
1. 2 answers
2. asked by Ashley Jimenez
3. 5,531 views
Which of the following solutes in aqueous solution would be expected to exhibit the smallest freezing-point lowering (assuming
1. 3 answers
2. asked by Marcus
3. 5,337 views
Can you help me unscramble these two words? ngtialceoo, birol
1. 6 answers
2. asked by Joseph
3. 5,045 views
Which figures will always be similar to each other? two rectangles, two trapezoids, two equilateral triangles, or two hexagons.
1. 20 answers
2. asked by Bell
3. 4,637 views
How long does it take to fully charge a 5µF capacitor in series witha 5 Mega Ohm resistor
1. 2 answers
2. asked by Matt, AGAIN
3. 3,551 views
a particle completes 4 revolution/sec on a circular path of radius 0.25m.calculate angular velocity
1. 3 answers
2. asked by saina
3. 3,438 views
I am trying to figure out if I am correct about the solubility of 9-fluorenone in NaOH and diethyl ether and the solubility of
1. 2 answers
2. asked by Zach
3. 3,316 views
Place the following fractions in order least to greatest:6/8, 7/12, 3/9, 5/7 How do you know which is least and greatest?
1. 7 answers
2. asked by Kim
3. 3,288 views
Determine the concentrations of K2SO4, K , and SO42– in a solution prepared by dissolving 2.84 × 10–4 g K2SO4 in 2.25 L of
1. 7 answers
2. asked by Jhanvi
3. 3,285 views
If 53.62 ml of an oil weighs 48.34 g, what is the specific gravity of the oil?
1. 3 answers
2. asked by rose
3. 3,224 views
A 10.0-kg object experiences a drag force due to air resistance. The magnitude of this dragforce depends on its speed, and obeys
1. 2 answers
2. asked by Stehlin
3. 2,933 views
Suppose of copper (II) nitrate is dissolved in of a aqueous solution of sodium chromate.Calculate the final molarity of nitrate
1. 1 answer
2. asked by madison
3. 2,909 views
mass of crucible- 26.4574gmass of crucible and hydrated sample- 27.7617g mass of hydrated sample 1.3043g mass of crucible and
1. 1 answer
2. asked by Johny
3. 2,853 views
two solutions are prepared using the same solutesolution a: 0.27g of the solute disolves in 27.4g of t-butanol solution b: 0.23g
1. 1 answer
2. asked by Robin
3. 2,848 views
Cola Corporation produces Orange Cola. The filling machines are adjusted to pour 12 ounces of soda into each 12-ounce can.
1. 4 answers
2. asked by Steven
3. 2,808 views
I need to write a balance equation of the decomposition of aluminum carbonate.I know the starting "reactant" is Al2(CO3)3 but
1. 1 answer
2. asked by Shadow
3. 2,760 views
This question id from IB exam,please help!1)Which compound has the highest lattice enthalpy? A. CaO B. CaS C. LiF D. LiI Explain
1. 3 answers
2. asked by chirikamo
3. 2,759 views
A bottle of juice holds 3/8 gallon when it is full, if 1/3 of the juice has been poured out, how much juice is left? Is this
1. 4 answers
2. asked by sonny
3. 2,680 views
Rearrange this expression into quadratic form, ax2 bx c = 00.20= ((x^2)/(55-x)) where a = 1, and identify the values of b and c.
1. 2 answers
2. asked by Robin
3. 2,604 views
A total revenue function is given by R(x) = 1000(x^2 - 0.1x)^1/2 , where R(x) is the total revenue, in thousands of dollars,
1. 2 answers
2. asked by Lina
3. 2,593 views
Write a opinion paper on the most significant consequences of the Agricultural Revolution.This is about 10,000 yearsago. One of
1. 5 answers
2. asked by Unknown
3. 2,483 views
Sec^2 2u-1/Sec^2 2u = Sin^2 2u
1. 2 answers
2. asked by Lisa
3. 2,447 views
The density of solid Cr is 7.15 g/cm3. How many atoms are present per cubic centimeter of Cr?As a solid, Cr adopts a
1. 1 answer
2. asked by Stephanie
3. 2,304 views
sing the proper average, find the average number of grams of fat per ounce of meat or fish that a person would consume over a
1. 1 answer
2. asked by roga
3. 2,303 views
In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on
1. 1 answer
2. asked by Maria
3. 2,290 views
If you invested a penny on Jan 1,1776 at 10% interest compounded daily, how much would you have on jan 1 2011?
1. 2 answers
2. asked by james
3. 2,246 views
how may 9-inch-square floor tiles are needed to cover a rectangular floor that measure 12 feet by 15 feet
1. 2 answers
2. asked by arlinda
3. 2,178 views
A family is having a pool built in their backyard. If their yard is rectangular and measures 7x by 6x and the pool is circular
1. 4 answers
2. asked by Cassie
3. 2,123 views
In a certain compound of copper and oxygen, a sample weighing 0.5424g contains 0.4831 g of Cu. How many moles of Cu in the
1. 1 answer
2. asked by Jester21
3. 1,863 views
2. Find the volume of a square pyramid with a base length of 9 cm and a height of 4 cm.a. 324 cm^3 b. 108 cm^3 c. 36 cm^3 d. 152
1. 5 answers
2. asked by Batman
3. 1,730 views
A light, rigid rod with two masses attached to its ends, one of mass 3M and one of mass M, is pivoted about a horizontal axis.
1. 0 answers
2. asked by Anonymous
3. 1,727 views
Which of the following solutes, dissolved in 1000g of water, would provide a solution would the lowest freezing point?.030 mol
1. 1 answer
2. asked by Marcus
3. 1,700 views
At 25 degrees C and 1 atm gas pressure, the solubility of CO2(g) is 149 mg/100 g water. When air at 25 degrees C and 1 atm is in
1. 1 answer
2. asked by Jacqueline
3. 1,648 views
3x^8 – 7x^8A.-4x^16 B.–21x^8 C.–4x^8 D.10x^8 I think this is C...just making sure you don't add the exponents...?
1. 4 answers
2. asked by Cassie
3. 1,647 views
A sports team is building a new stadium on a rectangular lot of land. If the lot measures 6x by 10x and the sports field will be
1. 5 answers
2. asked by Cassie
3. 1,617 views
What are three dominant rhetorical devices in the essay "Where the World Began" by Margaret Laurence?
1. 2 answers
2. asked by Emily
3. 1,603 views
what prefix turns the word "town" into a word meaning "center of town"?
1. 4 answers
2. asked by Angie
3. 1,580 views
A 10-g bullet of unknown speed is shot horizontally into a 2-kg block of wood suspended from the ceiling by a cord. The bullet
1. 2 answers
2. asked by Arogundade
3. 1,549 views
Which of the following gives off more energy than it absorbs? melting ice, burning propane in a gas heater, sublimation of
1. 3 answers
2. asked by lidia
3. 1,514 views
The Lewis dot structure of ammonia, NH3, reveals that it has one lone pair of electrons and three bonds (each to a hydrogen)
1. 1 answer
2. asked by luck
3. 1,504 views
The decomposition of ozone may occur through the two-step mechanism shown below:step 1 O3 ----> O2 + O step 2 O3 + O ---> 2O2
1. 1 answer
2. asked by Marcus
3. 1,490 views
What is the missing coefficient x 2 4x -2x x 2 ______ x
1. 1 answer
2. asked by justin
3. 1,470 views
Which of the following pure liquids is the best solvent for sodium fluoride?CCl4 C2C6 HCl BCl3 or PCl5 My guess would be either
1. 1 answer
2. asked by Marcus
3. 1,468 views
Enter the symbol for the element represented by the following electronic configuration.[Ar]4s23d6 ??? How does this work?
1. 1 answer
2. asked by will.i.am
3. 1,467 views
1984-1994 the equation the number of aids cases can be modeled by the equationC(x)=3034x^2+14,018x+6400 X represents years after
1. 2 answers
2. asked by Anonymous
3. 1,417 views
A sample of metallic element X, weighing 4.315g, combines with0.4810 L of Cl2 gas (at normal pressure and 20.0C) to form the
1. 1 answer
2. asked by Robert
3. 1,417 views
two solutions are prepared using the same solutesolution a: 0.27g of the solute disolves in 27.4g of t-butanol solution b: 0.23g
1. 1 answer
2. asked by Robin
3. 1,408 views
Why wouldn't you do this reaction directly in a lab (and would rather use Hess' Law to determine the enthalpy of formation)?:1/2
1. 1 answer
2. asked by a Canadian
3. 1,395 views
Please check my answers? My textbook won't load, so i've had to use google and guess.1. Scientists hypothesize that the sun
1. 7 answers
2. asked by Ava
3. 1,344 views
If the pH of a solution is 6, what are the hydrogen- and hydroxide-ion concentrations?The PH of a 0.1 M MCl (M+ is an unknown
1. 0 answers
2. asked by Jefferson
3. 1,337 views
This is my last question in Math. :p9. Find the volume of a rectangular prism with the following dimensions: Length = 5 mm Base
1. 2 answers
2. asked by Batman
3. 1,326 views
Hi! I am doing this chemistry lab of solubility curve of a solid investigation and this is for KCl.The purpose of this lab is to
1. 0 answers
2. asked by Lori
3. 1,323 views
answers to exam for penn foster
1. 1 answer
2. asked by Ivette
3. 1,304 views
1. Prove using mathematical induction that 1+2+3+...+n=[ n(n+1)]/22. Find the derivative of 2^x^2+log2(2x^2-1) 3. Use
1. 1 answer
2. asked by muselitata
3. 1,299 views
Consider the following equilibrium at 395K: NH4HS(s)<-> NH3(g) + H2S(g) The partial pressure of each gas is 0.265 atm. Calculate
1. 2 answers
2. asked by Susan
3. 1,291 views
What country has the lowest population density in Northern Africa and Southwest Asia and what religions originated in this area?
1. 4 answers
2. asked by Jerald
3. 1,271 views
Evaluate the impact the Sociological theories, Functionalism, Conflict, and Interactionism has by choosing one of the social
1. 1 answer
2. asked by Shel
3. 1,209 views
Sandra makes a pizza on 2/6 of the pizza.she adds green peppers to 5/6 of the pizza .which topping covers more of the pizza
1. 1 answer
2. asked by Pietro
3. 1,207 views
a manager bought some stamps. she gave 1/3 of them to a cashier and 1/5 of them to her secretary. if the secretary received 40
1. 2 answers
2. asked by brandi
3. 1,180 views
A flask is charged with 1.596 atm of N2O4(g) and 1.008 atm of NO2(g) at 25°C, and the following equilibrium is achieved.N2O4(g)
1. 4 answers
2. asked by Hannah
3. 1,180 views
Find the arithmetic sequence if the fourth term is -6 and the eleventh term is -34
1. 2 answers
2. asked by Lucia
3. 1,166 views
Solve the equation:a right pyramid with vertical height stand on rectangular base widith that measures 20cm by 14cm the hieght
1. 0 answers
2. asked by Thomas
3. 1,165 views
1. Prove using mathematical induction that 1+2+3+...+n=[ n(n+1)]/22. Find the derivative of 2^x^2+log2(2x^2-1) 3. Use
1. 0 answers
2. asked by muselitata
3. 1,148 views
H1P2: DECOMPOSITION OF AMMONIUM NITRATESolid NH4NO3 (ammonium nitrate) decomposes on heating to 400°C, forming N2O gas and
1. 1 answer
2. asked by Anonymous
3. 1,147 views
What is the density of a block of unknown material with a mass of 15.86 g if the dimensions are:length = 2.2 cm height = 1.7 cm
1. 1 answer
2. asked by kim
3. 1,114 views
3 environmental health hazard that cause ill health, crises, and or disasters within your community or any other community
1. 3 answers
2. asked by kabelo
3. 1,097 views
Which one of the following statements about lying is true.
1. 0 answers
2. asked by Sandra
3. 1,095 views
if the circumference of a circle is 12.56 m then what is its diameter?
1. 2 answers
2. asked by Anonymous
3. 1,092 views
What is the maximum mass of H2O that can be produced by combining 90.8 g of each reactant
1. 1 answer
2. asked by g
3. 1,092 views
real world situation a problem describing incresing then constant and finally decreasing
1. 1 answer
2. asked by matthew
3. 1,088 views
I need help with this lab.Write the equation for the decomposition of the hydrate, CuSO4*XH2O. Mass of crucible and hydrate:
1. 1 answer
2. asked by Mary
3. 1,040 views
A solution prepared by dissolving 3.00 grams of ascorbic acid (vitamin C, C6H8O6), in50.0 grams of acetic acid has a freezing
1. 3 answers
2. asked by Ace
3. 1,038 views
Which of the sentences below using direct address is punctuated correctly? (1 point)Please come with me, Sarah, and Tom, to pick
1. 8 answers
2. asked by Anonymous
3. 1,037 views
Story Problem - FactoringAn "A" train leaves a subway station every 13 minutes. An "E" train leaves evry 9 minutes. If both
1. 6 answers
2. asked by Najmah
3. 1,029 views
find range for g(X)= -cos4x
1. 1 answer
2. asked by Ray
3. 1,022 views
If a certain spring stretches 4.32221 cm when a load of 15.3617 N is suspended from it, how much will the spring stretch if it
1. 1 answer
2. asked by keisha
3. 1,015 views
. A bag contains 3 marbles: a red one, a white one, and a green one. Suppose that two marbles are selected without replacement.(
1. 1 answer
2. asked by James
3. 994 views
Instructions: Read each passage carefully. Classify each underlined word(s) as a noun (N), pronoun (PN), verb (V), adjective
1. 2 answers
2. asked by tamara
3. 994 views
A man was given $x. He spent 50 cents a day. How much money had he left afterA) 10 days? B) 2 weeks? C) t days?
1. 1 answer
2. asked by Emily
3. 994 views
Hi, here's my (almost) 2-paged lab report introduction (hopefully you remember it from yesterday).I went to class today, and
1. 3 answers
2. asked by a Canadian
3. 992 views
the energy that can extracted from a storage battery is always less than the energy that goes into it while it is being charged.
1. 1 answer
2. asked by jane
3. 991 views
Which of the following is an accurate description of Simpson's paradox?When groups of data are aggregated, an association can
1. 2 answers
2. asked by Anonymous
3. 986 views
Can you help me with an acrostic for science pertaing to plants
1. 1 answer
2. asked by matt
3. 970 views
Find the sum of 256, 14, 632, and 25.
1. 1 answer
2. asked by tamara
3. 970 views
Joe's utility over consumption and leisure is given by c^(1/2)+@l^(1/2), where @ is a positive constant. Find and graph Joe's
1. 0 answers
2. asked by Corey
3. 961 views
The vapor pressure of benzene (C6H6) at 25 degrees C is 95.1 mm Hg. What is the vapor pressure of benzene above a solution in
1. 1 answer
2. asked by Jacqueline
3. 957 views
Hi! Can someone please balance these equations, please?! I'm having major trouble! Thank you!HCl (aq) + NaHCO3 (aq) �¨ HBr
1. 1 answer
2. asked by Hallie
3. 927 views
Hi! I am doing this chemistry lab of solubility curve of a solid investigation and this is for KCl.The purpose of this lab is to
1. 1 answer
2. asked by Lori
3. 927 views
A battery delivering a current of 55.0 A to a circuit has a terminal voltage of 21.8 V. The electric power being dissipated by
1. 1 answer
2. asked by Anonymous
3. 921 views
Sandra makes a pizza .she puts mushrooms on 2/6 of the pizza .she adds green peppers to 5/8 of the pizza.which topping covers
1. 2 answers
2. asked by Pietro
3. 916 views
A 4.19-F and a 7.46-F capacitor are connected in series across a 35.0-V battery. A 8.46-F capacitor is then connected in
1. 1 answer
2. asked by Anonymous
3. 916 views
Which statement is true about how the first-person point of view in Narrative of the Life of Frederick Douglass affects the
1. 7 answers
2. asked by Princess752
3. 904 views
If the 60-kg player is running forward at 7.0m/s when she makes contact with the dummy, what is the players velocity at the end
1. 0 answers
2. asked by Steve
3. 899 views

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