Thursday
July 31, 2014

Posts by Jack


Total # Posts: 1,311

calculus
Find the relative extrema of f(x) = -2x^2 + 4x + 3 I don't know how to use the First derivative test to find it.

chem
a molar elipticity [q]466 nm, 25 C of D(−) − Co(en)3I3.H2O and obtained -5940 deg.cm2.decimol-1. Calculate the elipticity angleq (in mdeg) assuming they dissolved 0.25 g sample in 5 mL of H2O and used a 1 x 1 cm cuvette. (

physics
in a tug of war a jeep of a mass 1400kg and a tractor of a mass of 2000kg pull on a horizontal rope in opposite directions. at one instant, the tractor pulls on the rope with a force of 1.50*10^4N while its wheels push horizontally against the groud with a force of 1.60*10^4N ...

Organic Chemistry
In the substitution reaction of 2-pentanol with sulfuric acid and sodium bromide, how many grams of sodium bromide and mL of sulfuric acid would be required if we use 3.5 grams of 2-pentanol?

Chemistry
the activation energy for the decomposition of HI(g) to H2(g) and I2(g) is 186kj/mol. the rate constant at 555k is 3.42 x 10^-7 L/mol*s. What is the rate constant at 645K? Please Show all Steps! thank you!

Maths
Find all the roots of the equation Sin(2x)=1/2 in the range of -pi<x<pi giving answers in radians as multiples of Pi

Science
Help!! How many atoms in 3.45 mL of water? (H2O only;mL=g) and If you are out panning for gold and discover a nugget that is exactly 2.50 moles, how many molecules, atoms, and grams would you have? At a cost of $375 per ounce, what would be the value of gold?

stat
Microbes in a certain colony exposed to radiation have a 1=6 chance of being mutated. a. If ten microbes from the colony are sampled, what is the probability that exactly 4 will be mutated? b. If ten microbes from the colony are sampled, what is the probability that at most 4 ...

Chemistry
50 mL of Water Ti = 20C Tf = 45C d = 1.00 g/mL C = 4.184 J/g * C 50 mL * 1.00g/mL = 50 g Delta T = 45-20 = 25 C q = m * C * T = (50) (4.184) (25) = - 5230 J -5230/-82800 = 0.061 mol Molar mass of CaCl2 = 110.98 g/mol 0.061 mol * 110.98 g/mol = 6.77 g

7th grade
What is the rule for this function? Input 1, 2, 4, 5, 10, 12 output 3, 5, 9, 11, 21, 25

Calculus
A particle is moving along the curve y = 2 √{3 x + 7}. As the particle passes through the point (3, 8), its x-coordinate increases at a rate of 5 units per second. Find the rate of change of the distance from the particle to the origin at this instant.

Calculus
A particle is moving along the curve y = 2 √{3 x + 7}. As the particle passes through the point (3, 8), its x-coordinate increases at a rate of 5 units per second. Find the rate of change of the distance from the particle to the origin at this instant.

science
a microscope has two types of these

science
a microscope has two of these

math
how do you show that line 3x+y-2=0 is a tangent of the curve y=(4x-3)(x-2) and how to find the point of contact??

stats
yes.. good job

mathmath
A study conducted by the Metro Housing Agency in a midwestern city revealed the information below concerning the age distribution of renters in the city. (Round your answers to four decimal places.) Age Adult Population, % Group Who Are Renters, % 21-44 53 64 45-64 29 43 65 an...

Algebra
Determine the number of terms in the expression 14m - 16.

5th grade English
She will become a physicist one day. Have to identify the verb or verb phrase and then tell if it contains a linking verb or does not. will become=verb phrase contains linking verb

calculus
Find the 1st derivative of the function: y = 1/4 sin^2 (2x) So confused...

Math
what is the prime factorization of 72

math
A(-1,-2) B(7,2) show that the lenght AB may be written in the form p root5 wjere p is an integer to be found?? is then ans just 4root5?? if not hep please thenks

Math
make up a data set of at least 12 numbers that have the following landmarks. maximum 18 mode 7 range 13 median 12

physics college
Water flows (velocity initial=0) over a dam at the rate of 660 kg/s and falls vertically 81 m before striking the turbine blades. Calculate the rate at which mechanical energy is transfered to the turbine blades, assuming 55% efficiency.

Physics
Water flows (velocity initial=0) over a dam at the rate of 660 kg/s and falls vertically 81 m before striking the turbine blades. Calculate the rate at which mechanical energy is transfered to the turbine blades, assuming 55% efficiency.

chemistry
the molar mass of a newly synthesized jluorocarbon was measured in a gas microbalance, This device consists of a gkass bulb forming one end of a beam, the whole surrouned by a closed container. The beam is pivoted and the balance point is attained by raising the pressure of ga...

Science
How are the structures in genetics related?

Science
How do you represent data in a graph?

chemistry
A sample of an ideal gas at 15.0 atm and 10.0 L is allowed to expand against a constant external pressure of 2.00 atm at a constant temperature. Calculate the work in units of kJ for the gas expansion. (Hint: Boyle's law applies) Please explain thoroughly! thank you!

math
How do i show work for this math question. A puppet requires 3/4 yard of material. How many puppets can be made from 9 yards of material?

Chemistry
H2O (l) requires the largest amount of energy to raise the temperature of 25.0g H2O of the substance from 15.0 *C to 37.0 *C. Calculate the energy. Hg (l) has the largest temperature change when 550 g of the substance absorbs 10.7kJ of energy. Calculate the temperature change....

Chemistry
A sample of an ideal gas at 15.0 atm and 10.0 L is allowed to expand against a constant external pressure of 2.00 atm at a constant temperature. Calculate the work in units of kJ for the gas expansion. (Hint: Boyle's law applies) Please explain thoroughly! thank you!

physics
A picture hangs on the wall suspended by two strings, with è = 61°. The tension in string 1 is 1.8 N. è is connected to string 1, and 32° is connected to string 2. (a) Is the tension in string 1 greater than, less than, or equal to the tension in string 2...

physics
please help! physics doesn't click with me. thank you for your help! A 23 kg suitcase is being pulled with a constant speed by a handle that is at an angle of 25° above the horizontal. If the normal force exerted on the suitcase is 155 N, what is the force F applied to...

Chemistry
For every liter of sea water that evaporates, 3.70g of magnesium hydroxide are produced. How many liters of sea water must evaporate to produce 5.00 moles of magnesium hydroxide? Please show and explain all steps! Thank you!

math
Marcus want to make a stone walkway in his garden.the rectangular walkway will be 3 feet wide and 18 feet long.Each 2-foot by 3-foot stone covers an area of 6 sq. feet.How many stones will he need? is it 9?

calculus
Verify that the Intermediate Value theorem applies to the indicated interval and find the value of c guaranteed by the theorem. f(x) = x^2 - 6x + 8, [0,3], f(c) = 0 I have no idea how to use the theorem :(

science
What is the chemical name for Polyurethane and what does it look like at it's resting state?

Biology
ass

Avon k 8 Center
If 50 is the first number, what is the second number?

6th grade
Next, Tom remembers that he heard a doctor talking about something that takes two weeks to heal. I have to identify what type of pronoun that (second one in sentence) is. Would it be a relative pronoun?

Chemistry
ammonia gas reacts with copper (ii) oxide at high temperatures to produce elemental nitrogen, copper metal, and water vapor. Assume that 36.2g ammonia reacts with 180.8 g copper ii oxide. (balanced equation: 2 NH4 (ammonium) (g) + 4 CuO (copper ii oxide) ==> N2 (nitrogen ga...

Chemistry
Find the limiting reagent. 2 NH4 (g) + 4 CuO (s) ==> N2(g) + 4 Cu(s) + 4H2O (g) Please explain, thank you!

Chemistry
Find the limiting reagent. 2 NH4 (g) + 4 CuO (s) ==> N2(g) + 4 Cu(s) + 4H2O (g) Please explain, thank you!

Chemistry
61.0 mL of a 1.50 M solution is diluted to a volume of 258 mL. A 129-mL portion of that solution is diluted using 167 mL of water. What is the final concentration?

calculus
Fond the limit of lim x -> 3 [1/(x+4)] - (1/4) _________________ x

Chemistry
DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction: 2 C 6 H 5 Cl (Chlorobenzene) + C 2 H O Cl 3(chloral) ==> C 14 H 9 Cl 5 (DDT) + H 2 O In a government lab, 1142 g of chlorobenzene is reacted with 485g of Chloral. A)What mass of D...

physics
A hot air balloon has just lifted off and is rising at the constant rate of 1.8 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 11.2 m/s. If the passenger is 2.5 m ...

physics
An astronaut on Neptune drops a rock straight downward from a height of 0.95 m. If the acceleration of gravity on Neptune is 11.2 m/s2, what is the speed of the rock just before it lands? (m/s)

Math
State the Domain and show work. y = x + 2 / x^2 - 4x - 12

MATH
26=6(5-6A)

calculus
Find all possible radii of circle centered at (3,6) so that the circle intersects only one axis

calculus
Solve: sec(x)^2= 3tanx +1 *** It is suppose to be the sqaure root of 3 but i could find the symbol so just wrote the 3 without it but it is suppose to be the square root of 3 times tanx + 1

math
256 + 1,273

PRE CALCULUS
the question is actually square root of ( x+5) = x please ANSWER

PRE CALCULUS
How many real solutions does the equation ãx+5=x have? Please explain your answer to the best of your abilities thanks :)

Pre CALCULUS
How many real solutions does the equation x+5=x have? Please explain your answer to the best of your abilities thanks :)

Pre Calculus
As x increases from p/4 to 3p/2, the value of sin(x) : A.increases throughout the interval B.decreases at first, then increases C.increases at first, then decreases D.decreases throughout the interval E.none of the above please explain why the answer is as it is, I dont unders...

Calculus
Solve for x: lnx^3 - 2lnx = 1 Please try and show how you got the answer best as you can thank you :)

Calculus
Solve : sec^2(x)= ã3*tanx + 1 on [0,radian-180 degrees) - couldnt find the symbol for radian on computer please try and explain how you got your answer best as yu can thanks so much :)

Calculus
The normal body temperature in humans ranges from 97.6 degrees fahrenheit to 99.6 degrees fahrenheit. Concert this temperature range into degrees celcius

Calculus
The celcius scale is devised so that 0 degrees celcius is the freezing point of water ( at 1 atmosphere of pressure) and 100 degrees celcius is the boiling point of water ( at 1 atmosphere of pressure) . If you are more familiar with the Fahrenheit scale, then you know that wa...

Chemistry
A single 4p orbital can hold how many electrons? i got 6 is that correct or no? Would conducting electricity be considered a physical or a chemical property of ZINC?

rounding
(a) 455 cal to joules thats 1 903.72 joules but i need to round it to 3 sig figs how do u do that?

9th grade
we know that sum means adding. So which one of your choices deals with adding?

plz help me for math
you always want to start by putting like terms together. So why don't you do that first and then its really easy from there all you have to do is follow the signs(- or +) and add or subtract

chemistry
Would Conducting electricity be considered a physical or chemical property of zinc i got physical but just want to make sure.

Chem
Would conducting electricity be considered a physical or chemical property of ZINC i got phyiscal but just want to make sure.

chemistry
A single 4p orbital can hold how many electrons? i got 6 is that correct or no?

Pre Calculus
Determine the coordinates of the point (xy) where the curves y=(12)x−5 and y=x2+2x−15 intersect in the third quadrant

Pre Calculus
The strength of a cable is proportional to the square of its diameter. If a 2-cm cable will support 800kg, how much will a 3-cm cable support?

chemistry
A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the temper...

chemistry
Which of the following properties is a chemical property of phosphorus? Answer a) it burns in air b) it is a white waxy solid c) it melts to form a viscous liquid at 44.1 oC d) Both a and c are both examples of chemical properties. e) a, b, and c are examples of chemical prope...

chemistry
Convert a density of 2.74 x 103 g/L into a density with dimensions of kg/mL. please show how would this conversion be done.??

physics
A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the temper...

Mayans and aztecs
how did the aztecs acquire most new pieces of land

Chemistry
Are significant figures relevant in temperature? ex: (-459 *F - 32 *F)(5 *C/ 9 *F) = -272.78 *C So would I leave my answer as -272.78 *C? or -273 *C because of significant figures?

Chemistry
Are significant figures relevant in temperature? ex: (-459 *F - 32 *F)(5 *C/ 9 *F) = -272.78 *C So would I leave my answer as -272.78 *C? or -273 *C because of significant figures?

math
find the range of the function. g(x) = 5 + (square root of) (4 - x) please show all steps.

Math
Solve the following equation. 4.7 = 1.13x^2 Do i square root the 1.13x^2 first? or divide both sides by 1.13?

5th grade math
what is 2 to the first and second power? component problem

math
It took a faster runner 10 sec. longer to run a distance of 1500 m than it took a slower runner to run a distance of 1000 m.If the rate of the faster runner was 5 m/sec more than the rate of the slower runner,what was rate of each?

math
which has greater volume? a) 1.0 kg of feathers or 1.0 kg of lead b) 100 g of gold or 100 g of water c) 1.0 L of copper or 1.0 L or mercury

math
write 480 in a) 1 significant figure b) 2 significant figures c) 3 significant figures d) 4 significant figures

math
what is the role of derrivatives in the subjects other than mathematics.

5th grade English
However, misfortune and trouble did not stop Ray Charles. Subject=misfortune, trouble Verb= did stop

Math
A pair of fair dice is rolled. Let E denote the event that the number landing uppermost on the first die is a 3, and let F denote the event that the sum of the numbers landing uppermost is 6. Determine whether E and F are independent events

math
corp provides issuance of 200,000 shares of common stock. 40,000 shares were originally issued and 500 were reacquired. What is the number of shares outstanding?

math
corp provides issuance of 200,000 shares of common stock. 40,000 shares were originally issued and 500 were reacquired. What is the number of shares outstanding?

physics
"A one meter board with uniform density, hangs in static equilibrium from a rope with tension T. A weight hangs from the left end of the board 0.2m away in distance. What is the mass of the board"

MATH
1/2, 3/4, 3/8

MATH
FIND THE L.C.D. OF EACH AND EXPRESS THE FRACTIONS OF EACH IN TERMS OF THE L.C.D.

Chemistry
107.8?????

algebra
solve by multiplication -7/8x = -9/10

math
the equation is actually 2t^3-4t^2+3

math
Consider the function defined below. y = 2t3 - 4t2 + 3 (a) Calculate the second derivative. y '' = (b) Calculate the third derivative. y ''' =

math
which one is part a and part b.

Statistics
Total plasma volume is important in determining the required plasma component in blood replacement theory for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that sample of 61 male firefighters are ...

Statistics
Assuming that the heights of college women are normally distributed with mean 62 inches and standard deviation 3.5 inches, what percentage of women are between 58.5 inches and 72.5 inches? 34.1% 84.0% 15.7% my answer was 13.6 13.6% is this correct 97.6%

Statistics
x=3-0 . What percentage of the area under the normal curve lies to the left of ( 16.0% 15.80% 2.50% 0.50% having trouble with this my answer was 15.00% 0.15%

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