Thursday
July 31, 2014

Posts by brian


Total # Posts: 589

math
121

Algebra
Thank you for helping Ms. Sue.

Algebra
A rectangular Persian carpet has a perimeter of 212 inches. The length of the carpet is 24 inches more than the width. What are the dimensions of the carpet?

Math
At a carnival, Linda bought packs of tickets each. She has used of the tickets so far. How many tickets does she have left?

math Question
Find an equation that models a hyperbolic lens with a=12 inches and foci that are 30 inches apart. assume that the center of the hyperbola is the origin and the transverse axis is vertical.

algebra
The first angle of a triangle is 23° more than the 2nd angle. The 3rd angle of a triangle is 6 times the 2nd angle. Use X to represent the unknown value

Math
6 because you have to change mixed numbers into improper fractions do 1 1/2 becomes 3/2 and 4x(3/2) = 6.

Chemistry
The part of an electrochemical cell that carries electrons to a reacting ion is a(n) (1) cathode (2) anode (3) electrode (4) electrolyte

Global History
Vietnam was not originally what France primarily wanted. Explain the value of Vietnam at the time. The time period is around the Vietnam war!

MATH
A photograph has been enlarged to three times its previous size. By what percentage has the size of the photograph increased?

Chemistry
Compare the physical and chemical properties of acids and bases.

Chemistry
Element P electron configuration is 2-8-8-1 Element Q electron configuration is 2-8-18-7

Health
Explain how homelessness is a health-related social issue.

Chemistry
Explain how a person bailing out a row boat with a leak could represent a state of physical equilibrium.

math
Input output table like this 0 in no output 2/3 in 17/6 out 11/4 in ? Out 3 in 13/3 out - in 13/2 out ?

Science
Thanks you very very much !

Science
How are are the viruses, bacteria, fungi, and protists similar? are the all living things or only visisble to through a microscope or infectious diseases??

social studies
Which of the following statements about the natural resources of the United States is most accurate? A. The many agricultural resources of the United States have made up for its lack of other resources. B. U.S. industry and agriculture have prospered because America has many d...

LANGUAGE ARTS
what is number 2 and 3

5th Grade Math
Complete the knput output table write the rule. 0 in - out 3/2 in 17/6 out 11/4 in - out 3 in 13/3 out - in 13/2 out i don t understand

Physics
A baton twirler tosses a baton into the air with an initial angular velocity of 2 rev/s (revolutions per second). The baton undergoes a constant angular acceleration of -.015 rev/s^2 while in the air, and its angular velocity when she catches it is .8 rev/s. Determine the numb...

Calculus II
Wow this problem is easier than I thought it was. Thanks.

Calculus II
A cable that weighs 1.5 lb/ft is used to lift 700 lb of coal up a mineshaft that is 400 ft deep. Find the work done.

Thomas Nelson
What is chromatin?

Chemistry Hess's Law
(1) 2 Ni(s) + O2 (g) --> 2NiO(s) delta H= -479.4 kJ (2) Ni(s) + Cl2(g) --> NiCl2(s) delta H= -305.3 kJ Using equations 1 and 2 and Hess's Law, determine the amount of moles Nickel (ii) Chloride that was combusted given the following: volume = 15.45 L pressure = 2.29 ...

math
Verify the given linear approximation at a = 0. Then determine the values of x for which the linear approximation is accurate to within 0.1. (Enter your answer using interval notation. Round your answers to three decimal places.)

Math
Solve for a and b. 2a-ai-5b=0, a-2b-bi=0. Where i is complex number.

Math
Solve x^2+1=0.

Math
Solve x^2+1=0.

social studies
According to the majoritarian model of democracy, what role should public opinion play?

physics
A bullet was fired horizontally from the top of a 1.5x10^2 m tall tower at 2.8x10^2 m/s. Determine its speed on impact with the ground below.

math
Use the formula t = (0.25) s1/2 to find the time t in seconds it will take a stone to drop a distance s of 200 feet. Round your answer to the nearest tenth of a second.

ap chemistry
How would you find the remaining mass of the excess reagent?

physics
A rocket is used to place a satellite in orbit about a planet. The velocity of the satellite is 534 m/s and the radius of orbit is 1.21×108 m. What is the mass of planet?

macroeconomics
b. Now suppose that the gross national debt initially is equal to $2.5 trillion and the federal government then runs a deficit of $100 billion: i. What is the new level of gross national debt? ii. If 100 percent of the deficit is financed by the sale of securities to the publi...

Finite math
The manager of a money market fund has invested $4.2 million in certificates of deposit that pay interest at the rate of 5.4%/year compounded quarterly over a period of 5 years. How much will the investment be worth at the end of 5 years?

fnite math
Juan invested $24,000 in a mutual fund 5 years ago. Today his investment is worth $34,616. Find the effective annual rate of return on his investment over the 5-year period.

physics
I solved and got 0.399m and that was wrong, so I don't know...

physics
I'm really confused on this problem too. Does anyone understand how to do it?????????

Accounting
85,000

social question
how much gas do you use to travel 172 miles at 4.00 a gallon.

social question
how much gas do you use to travel 172 miles at 4.00 a gallon.

Physics
Two charges +q and −q are separated by a distance d=50 cm. The electric field lines for this system form the the well-known pattern showed in the figure below. Consider two lines L1 and L2 lying on the same plane and leaving the positive charge at α=±45∘...

Math
Six people are playing Secret Santa for Christmas. They will each give one gift to someone, and each receive one gift from someone. They are not allowed to receive their own gift. How many different ways are there to exchange gifts?

Math
Find an equation for the line that contains the points (2, -3) and (6, 9).

Calculus
ç1 0 x^2dx=1/3. Use this and the properties of integrals to evaluate ç1 0 10−2x^2dx

Calculus
A piece of wire 40 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral triangle. How should the wire be cut so that the total area enclosed is a maximum= minimum= Find the length of the wire used

Chemistry
For a solution of 3.3 M H2CO3 (Ka = 4.4 × 10-7), calculate: (a) [H+] ____?______M (b) pH _____??______ (c) percent ionization ______?______%

Math
What is 1 5 of 20

Urgent math
If f(x, y, z)=sin(3x-yz), where x=e^(t-1), y=t^3, z=t-2, what's df/dt(1)? x(1)=1 y(1)=1 z(1)=-1 df/dt=(3cos(3x-yz))(e^(t-1))+(cos(3x-z))(3t^2)+(cos(3x-y))(1) I seriously need help on this and tell me the answer and show your work through steps. Thanks.

Algebra
A chain store manager hs been told by the main office that daily profit, P, as related to the number of clerks working that day, x, according to the functions P=-25x^2 + 300x. What number of clerks will maximize teh profit, and what is the maximum possible profit?

Calculus
Estimate ç 6 0 6−x^2 dx using 3 right rectangles

Calculus
Estimate ç 6 0 6−x^2 dx using 3 left rectangles.

physics
An aluminum wing on a passenger jet is 38 mlong when its temperature is 23°C.At what temperature would the wing be 2 cm (0.02 m) shorter?

Chemistry
A compound containing only carbon, hydrogen and oxygen is subjected to elemental analysis. Upon complete combustion, a .1804g sample of the compound produced .3051g of CO2 and .1249g of H2O. What is the empirical formula of the compound?

Chemistry
What is the wavelength of an electron traveling at 7.59% of the speed of light?

Chemistry
How many valance electrons are there in [(C2H5)4N]+ ?

Chemistry
What is the C-C-H bond angle in the molecule H2CCO?

Chemistry
What type of reaction will occur when an aqueous solution of lithium chloride is mixed with an aqueous solution of ammonium sulfate?

Analytical Chemistry
Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 291 units was obtained for the intensity of the 671 nm red emission line. Then 1.00 mL of a 11.7 mM Lithium standard was added to 9.00 mL of ...

Physics
Dry air will break down if the electric field exceeds about 3.0 × 106 V/m. What amount of charge can be placed on a capacitor if the area of each plate is 6.7 cm2?

physics
The two plates of a capacitor hold +3200 µC and -3200 µC of charge, respectively, when the potential difference is 700 V. What is the capacitance?

Calculus I, differentiation
The number, N, of people who have heard a rumor spread by mass media by time, t, is given by N(t)=a(1−e−kt). There are 6 million people in the population, who hear the rumor eventually. If 5% of them heard it on the first day, find the percentage of the population ...

Physics
Betty weighs 427 N and she is sitting on a playground swing seat that hangs 0.22 m above the ground. Tom pulls the swing back and releases it when the seat is 0.88 m above the ground. The acceleration of gravity is 9.8 m/s2. How fast is Betty moving when the swing passes throu...

invest
You budget $100 for parking each month. Each day you use the downtown parking lot, it costs you $5. Write a rule to represent the amountof money left in your monthly budget as an arithmetic sequence. How much money is left in your budget after you have used the downtown parkin...

Algebra
invest $ 3000 and save $100 each month. Write a rule to represent the total amount of money invest into your account as arithmetic sequence. How much money will you have invested after 12 month?

Physics
A cannon is mounted on a truck that moves forward at a speed of 5 m/s. The operator wants to launch a ball from a cannon so the ball goes as far as possible before hitting the level surface. The muzzle velocity of the cannon is 50 m/s. What angle from the horizontal should the...

Differential Equations
y'=2x+y. Find a solution whose graph is also an isocline.

Physics
A cannon is mounted on a truck that moves forward at a speed of 5 m/s. The operator wants to launch a ball from a cannon so the ball goes as far as possible before hitting the level surface. The muzzle velocity of the cannon is 50 m/s. What angle from the horizontal should the...

Life oreintation
What according to the basic conditions of employment act applies with regard to the contraventions

Physics PLEASE HELP!
Youre summing forces so mg is force due to gravity g=9.8 There are three forces, kx the spring mg gravity and qE the field force

Physics
40.6 m/s 1.3 s -26 degrees

World history; HELP
Didn't you learn to read a textbook instead of asking online for homework answers?

Psychology
Human relations are universal, but those defined as basic or primary are: a. the same from culture to culture b.defined differently in different cultures

Calculus
Use the graph of f(x)=x^2/(x^2-4) to determine on which of the following intervals Rolle's Theorem applies. A) [0, 3] B) [-3, 3] C) [-3/2, 3/2] D) [-2, 2] E) None of these

Urgent Math
f(x)=(x+2)^3-4. The point (-2, -4) is which of the following? A) An absolute maximum B) An absolute minimum C) A critical point but not an extremum. D) Not a critical point E) None of these I think the answer is C, am I right?

Math
Use the definition of logarithm to simplify each expression. (a) log6b (6b) (b) log9b ((9b)^5) (c) log10b ((10b)^-8)

Math
Evaluate the following expression. (Note, I'm not sure how to write this in mathematical form)but the P is slightly raised above both numbers. 210 P 1 = ______

Math
Find the probability whose odds against are given in the problem. Odds against are 5 to 7. Answer is ________.

Math
From a survey of 200 college students, a marketing research company found that 130 students owned iPhones, 70 owned cars, and 60 owned both cars and iPhones. (a) How many students owned either a car or an iPhone (but not both)? _______students (b) How many students do not own ...

Math
Thank you Ms. Sue!

Math
The math problem is set up as a fraction in parenthesis 6 over 4. Evaluate the expression (6/4)

Urgent Math
Let f"(x)=4x^3-2x and let f(x) have critical values -1, 0, and 1. Determine which critical values give a relative maximum. A)-1 B)0 C)1 D)-1 and 1 E) none of these

Physics
I still don't understand part (a). I know that cos^2(90)=0 but how did you get to the answer of 2 sheets?

Physics
I don't really know. I did ln(1/100)=-4.605 and ln(cos(90)^2)=-1.605 and 4.605/1.605=2.869. The answer for part (a) should be 2 but 2.869 is closer to 3 so am I doing anything wrong?

Physics
We want to rotate the direction of polarization of a beam of polarized light through 90 degrees by sending the beam through one or more polarizing sheets.(a) What is the mini-mum number of sheets required? (b) What is the minimum number of sheets required if the transmitted in...

Physics
We want to rotate the direction of polarization of a beam of polarized light through 90 degrees by sending the beam through one or more polarizing sheets. (a) What is the mini-mum number of sheets required? (b) What is the minimum number of sheets required if the transmitted i...

Physics
A small spaceship whose mass is 1.5x10^3 kg (include-ing an astronaut) is drifting in outer space with negligible gravitational forces acting on it. If the astronaut turns on a 10 kW laser beam, what speed will the ship attain in 1.0 day because of the momentum carried away by...

Physics
Some neodymiun-glass lasers can provide 100 TW of power in 1.0 ns pulses at a wavelength of 0.26 um. How much energy is contained in a single pulse?

Physics
A spaceship at rest in a certain reference frame S is given a speed increment of 0.50c. Relative to its new rest frame, it is then given a further 0.50c increment. This process is continued until its speed with respect to its original frame S exceeds 0.999c. How many increment...

Physics
Thank you!

Physics
A 5.00-grain aspirin tablet has a mass of 320 mg. For how many kilometers would the energy equivalent of this mass power an automobile? Assume 12.75 km/L and a heat of combustion of 3.65x10^7 J/L for the gasoline used in the automobile.

Physics
A spaceship at rest in a certain reference frame S is given a speed increment of 0.50c. Relative to its new rest frame, it is then given a further 0.50c increment. This process is continued until its speed with respect to its original frame S exceeds 0.999c. How many increment...

Physics
Thank you so much!

Physics
If we intercept an electron having total energy 1533 MeV that came from Vega, which is 26 ly from us, how far in light-years was the trip in the rest frame of the electron? (Answer: 8.7*10^-3 ly)

Physics
I got 1*10^-16 but what's the unit for my answer? Because the book says 1.0 ke V is the answer for part (a). How do I get there?

Physics
How much work must be done to increase the speed of an electron (a) from 0.18c to 0.19c and (b) from 0.98c to 0.99c? Note that the speed increase is 0.01c in both cases.

algebra 1
write the slope-intercept form of the line that passes through (-4-3) and in parrallel to the line t=-1/3x +3

Chemistry
Isn't the molar mass 92.09 g/mol? This is what i got with /\T=Kf*m formula. If that's the case then C3H8O3 is the empirical formula and the molecular formula. Correct?

Physics
A plant hangs from a 1.9 cm diameter suction cup affixed to a smooth horizontal surface (there's a figure but it's pretty simple, a plant in a plant pot hanging from a couple wires, but what seems to matter is the suction cup part). (a) What is the maximum weight that ...

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