Monday

December 5, 2016
Total # Posts: 791

**Algebra**

) An inlet pipe can fill an empty tank in 5 hours by itself, and an outlet pipe can drain the same tank when full in 7 hours by itself. If the tank is two-thirds full when the valves for both pipes are opened, how many minutes will it take to fill the tank?

*December 1, 2016*

**Calculus**

Find the derivative. y=e^8x/[e^(8x)+9] y' = The answer I have is 8e^8x/[(e^8x+9)^2] but it marked it incorrect..

*November 13, 2016*

**Calculus**

Use the function f and the given real number a to find (f^-1)'(a) f(x)=(x+9)/(x+3), x>-3, a=2 f(^-1)'(a)= ? Can someone please show me how to solve this problem?

*November 13, 2016*

**Calculus**

The answer is 1/11

*November 13, 2016*

**Calculus**

1/116 is not correct

*November 13, 2016*

**Calculus**

No it is x^3

*November 13, 2016*

**Calculus**

Use the function f and the given real number a to find (f^-1)'(a) f(x)=x^3+8x-3 a=6 (f^-1)'(6)= Thank you.

*November 13, 2016*

**Calculus**

The demand equation for a product is p=88,650/(396+3x) where p is the price (in dollars) and x is the number of units (in thousands). Find the average price p on the interval 40 <= x <= 50. (Round your answer to two decimal places.) Please show work because I know the ...

*November 13, 2016*

**Math**

7×3/2×2×2+24 is your answer. You just go backwards. For example, instead of 1/2 you would flip it and do times 2. Am I making sense or do you need me to explain more?

*November 12, 2016*

**Math**

Thanks

*November 12, 2016*

**Math**

It doesn't say in the question. So is it expecting us to know that a standard set has 28 dominoes?

*November 12, 2016*

**Math**

How do you know there are 28 dominoes?

*November 12, 2016*

**Math**

In a standard set of dominoes, a face of each domino has a line through the center, with 0 to 6 dots on each side of the line. Each possible combination of dots is used exactly once, one combination per domino. What is the probability that a randomly selected domino will have ...

*November 12, 2016*

**Maths**

3^36 + ? = perfect cube ? Has to equal 3^? Am I making sense? See if you can figure it out now (?^?^?)

*November 12, 2016*

**Government and politics **

Explain 2 enumerated powers of the president and 2 enumerated powers of congress

*November 3, 2016*

**Government and politics **

How does making laws to the people make it easjer? THe elastic clause

*November 3, 2016*

**Government and politics**

The executive legislative and judicial branches

*November 3, 2016*

**Government and politics **

In what way do other branches and the public influence the bureaucracy? I need 3 paragraphs

*November 3, 2016*

**Government**

I need a more specific answer

*November 2, 2016*

**Government **

How does the 3 branches of government influence the bureaucracy?

*November 2, 2016*

**chemistry**

A student conducts a reaction and measures a 19.9 g yield. The theoretical yield of the reaction under the conditions used is 31.4 grams. What percent yield did the student achieve?

*November 2, 2016*

**Math**

Well, I guess it'll do. Thanks for your help.

*November 2, 2016*

**Math**

Actually, on the sheet I have, it says 0.72%

*November 2, 2016*

**Math**

In a sponsored walk for charity, 560 students participated. Of these, 0.72% completed the 15-km walk. How many students completed the walk?

*November 2, 2016*

**Math**

Find the simple interest of $3800 at an annual rate of 3.5% for 3 years.

*November 2, 2016*

**math**

the number of trucks crossing the border fell from 3240 to 2673. What is the percent decrease?

*November 2, 2016*

**Algebra 1**

Whoops. the choices for number 4 was: A. 7.3x^2 + 0.8x + 0.7. B. 7.3x^2 - 0.8x + 1.3. C. 7.3x^2 + 0.8x + 1.3.*** D. 7.3x^2 + 0.8x - 1.3.

*October 24, 2016*

**Algebra 1**

Just checking my answers. What is the sum or difference? 1. 2x^4 - 8x^4 A. -6x^8 B. -6x^4*** C. -16x^4 D. -16x^8 What is the sum or difference 2. 10y^10 - 14y^10 A. -4y^20 B. -140y^20 C. -140y^10 D. -4y^10*** 3. Write the polynomial in standard form. Then name the polynomial ...

*October 24, 2016*

**Chemistry **

5.58g of Fe reacted with 3.0g of oxygen. How many moles of Fe were used?

*October 23, 2016*

**Math**

Which is the greater amount of money, 120% of 0.3% of $1000 or 120.3% of $1000?

*October 21, 2016*

**Math**

What unknown number makes these equation true. 447+99 =447+100-

*October 5, 2016*

**Math**

What unknown number makes these equations true 353-203 = 353-200-

*October 5, 2016*

**Aglebra, math**

Hi I really need help with this question and I don't know a thing about algebra!!! If anyone can help me understand this that would mean a lot! So here's my question. Brad says that the literal equation a = 3b + 4c - a is solved for a. Do you agree? Why or why not?

*October 5, 2016*

**Math**

put brackets into these statements to make them true: a) 20 - 2 + 2 * 2^2 + 6 = 26 b) 20 - 2 + 2 * 2^2 + 6 = 120

*September 28, 2016*

**Science**

We call zone of saturation the level to which the water fills all the interstices, or the pores, with the ground and all cracks minusclus of the rock/this fresh water supply exists in all the grounds. Why?

*September 21, 2016*

**Science**

what geographical features create natural boundaries for water to flow toward one ocean or another?

*September 21, 2016*

**Algebra **

I need help, it's a crossword puzzle. 10 letters, the last letter is T the 3rd letter is E. The question is: You can think of an opposite sign as ____ or -1 PLEASE HELP

*September 14, 2016*

**Physics**

A motorboat whose speed in still water is 2.91 m/s must aim upstream at an angle of 30.0 degrees (with respect to a line perpendicular to the shore) in order to travel directly across the stream. - What is the speed of the current? - What is the resultant speed of the boat ...

*May 27, 2016*

**Science**

If the earth exerts a 500 N gravitational force on an object in near space, how much force does this object exert on the earth, and by what law can this be asserted?

*May 18, 2016*

**Physics**

How would you change the following Galilean transformation equations in the case where a frame was moving both in the x and the y direction? (Use the following as necessary: x, y, z, Vx, Vy, t.) x' = y' = z' = t' =

*May 13, 2016*

**Physics**

Estimate the increase in rest energy of a copper sample [100 kg, c = 387 J/(kg · °C)] if its temperature is increased 100°C. -answer needs to be in kg please.

*May 13, 2016*

**social studies**

Summarize the ways which minnesotans contribute to WW2

*May 12, 2016*

**Math **

A rectangle has a width of 5 meters and length of 14 meters. If a similar rectangle has a width of 15 meters, what's its perimeter, in meters?

*May 10, 2016*

**Algebra**

3/8x + 180=3.5g

*May 6, 2016*

**math**

Range:9 Median:5 Mode:5

*May 6, 2016*

**Math**

y=10

*May 5, 2016*

**Math**

Find the missing number that completes the table of values what's the Function Objective a function table Example:y= X+2

*April 7, 2016*

**Physics**

A boy sliding down a frictionless plane inclined at an angles 35° with the horizontal. What is the acceleration of the book?

*April 2, 2016*

**Physics**

In Europe, the standard voltage is 230 V (rms), AC, and 50 cycles/s. Suppose you take your 5.00 W electric razor to Rome and plug it into the receptacle (with an adapter to fit the receptacle but not to change the voltage). (The standard voltage in the United States is 120 V (...

*March 26, 2016*

**English**

SUMMARIZE WHAT YOU HAVE WRITTEN AND TELL PEOPLE WHAT YOU WANT THEM TO REMEMBER IN YOUR WRITING.

*March 26, 2016*

**Math**

3 and seventh/eights on a ruler.

*March 8, 2016*

**Math**

On the ruler below, identify the location of 3 7/8

*March 8, 2016*

**Math**

On the ruler below, identify the location of 7 3 -- 8

*March 8, 2016*

**Organic Chemistry**

We used sodium dichromate in sulfuric acid to oxidize borneol to camphor. Suppose you needed to prepare benzaldehyde from benzyl alcohol. Would the sodium dichromate be the best choice for this oxidation or are there better choices? Explain.

*March 1, 2016*

**Science **

A 20 kg mass slides down an inclined plane which is at an angle of 60 degrees to the horizontal 1. Horizontal component of weight force 2. Vertical component of weight force 3. Angle 4. Normal force 5. Net fx 6. Acceleration along incline I really do not get how to do this, I ...

*March 1, 2016*

**Physics**

THANK YOU Scott!! You made my day.

*February 18, 2016*

**Physics**

A synchrotron radiation facility consists of a circular ring that has a 48.0 m radius and creates an electron beam with a current of 497 mA when the electrons have a speed approximately equal to the speed of light. How many electrons pass a given point in the accelerator per ...

*February 18, 2016*

**Physics**

There is current of 115 pA when a certain potential is applied across a certain resistor. When that same potential is applied across a resistor made of the identical material but 30 times longer, the current is 0.044 pA. Compare the effective diameters of the two resistors. d2...

*February 18, 2016*

**Physics**

A 14.1 μF capacitor is charged to a potential of 45.0 V and then discharged through an 80.0 Ω resistor. (a) How long after discharge begins does it take for the capacitor to lose 90.0% of the following? (i) its initial charge in seconds (ii) its initial energy in ...

*February 18, 2016*

**Math**

2.75 - 0.33 = 2.42 miles on the bus 2.42 * 2 = 4.84 miles 4.84 is the final answer Nick

*February 18, 2016*

**Physics**

A 500 g sample of gold heated to 971.0 deg. C is placed in a calorimeter containing 220 g of water initially at 20.0 deg. C. If no heat is lost to the surrounding environment what will the final temperature of the water be? [HINT: At the end, the sample will be in thermal ...

*February 16, 2016*

**Physics**

A cylinderical brass rod with a radius of 2.10 cm and length of 1.50 m is placed in a fire with temperature of 490 deg. C. If the other end of the rod is at a temperature of 33 deg. C, what is the rate of heat transfer through the rod (ignore any heat loss from the sides of ...

*February 15, 2016*

**P**

A 500 g sample of gold heated to 971.0 deg. C is placed in a calorimeter containing 220 g of water initially at 20.0 deg. C. If no heat is lost to the surrounding environment what will the final temperature of the water be? [HINT: At the end, the sample will be in thermal ...

*February 15, 2016*

**Physics**

A styrofoam cooler is a cube with side length of 20.0 cm and walls with thickness of 1.9 cm. If the external temperature is 27.0 deg. C and the cooler contains ice and water at 0 deg. C. How much heat is transferred into the box in 24 hours? - I got 2.95x10^5 J for this and it...

*February 15, 2016*

**Physics**

I have a few physics questions that I don't understand. Two are thermal expansion problems and the other is an ideal gas law problem. 1. Two rods, one made of iron and the other of aluminum, have the same initial length at 64.00 deg. C? When the temperature drops to 4.00 ...

*February 8, 2016*

**math**

idk the answer

*February 8, 2016*

**Physics**

Charge A, +1 μC, is positioned at the origin of a coordinate system as shown below. Charge B, −1 μC, is fixed at x = 3 m. (a) Determine the magnitude and direction of the force that charge B exerts on charge A. (b) What is the force that charge A exerts on ...

*January 29, 2016*

**Physics**

Charge A, +1 μC, is positioned at the origin of a coordinate system as shown below. Charge B, −1 μC, is fixed at x = 3 m. (a) Find the electric field on the x axis at x = 6 cm. (b) At what point on the x axis is the electric field zero?

*January 29, 2016*

**Physics**

(a) Estimate the positive charge in you due to the protons in the molecules present in your body. (Assume that the human body is made entirely out of water.) (b) What is the net charge in your body?

*January 29, 2016*

**Physics**

Tarzan (80 kg) runs toward a vine at 4.8 m/s where Jane (60 kg) is hanging on. He jumps and grabs the vine. How high does the vine swing? If the vine is 25 m long, how much of an angle does that make?

*January 28, 2016*

**physics**

A 10 kg mass moving at 6 m/s strikes a stationary 2 kg mass in an elastic collision. Determine the velocity of each after the collision. 10(6)+2(0)=(10)Vf1+(2)Vf2 60=(10)Vf1+(2)Vf2

*January 28, 2016*

**Algebra**

A colony of bacteria has a population of ten initially, and doubles in size every three hours. What is the population of the colony after 24 hours of growth ?

*January 24, 2016*

**geometry**

two boards make up two sides of triangular sandbox 8ft and 5 ft what size board makes third side? I say 5 because this makes an isoles triangle

*December 16, 2015*

**Geometry 12**

F is the center point. I have the same question and I'm really confused.

*December 14, 2015*

**Math **

I am a common multiple of 8 and 2. I am greater than 50 and my digits are 3 apart. What am I?

*December 7, 2015*

**Writing**

Just look back in the story to answer this essay!

*November 20, 2015*

**Physics**

Damon, thanks but is that for A or B and what is the answer, please star it or underline it or something that it shows the final answer for it.

*November 20, 2015*

**Physics**

A set of density rods is designed to illustrate the concept of density. The idea is to create cylinders of equal diameters and masses, but varying lengths, to show which have the largest and smallest densities. (a) Derive a formula that will predict the ratio of the length of ...

*November 20, 2015*

**multiple choice economics**

D. A good that is perceived as a necessity will be purchased even if the price rises. People will buy anything if it is a necessity like bread, milk or gas for their car, no matter how much money it costs.

*November 19, 2015*

**Physics**

They also said Derive a formula that will predict the ratio of the length of one rod to the length of another rod. Assume the radius and mass of each cylinder is the same and express your answer in terms of the specific gravity of each rod. (Use the following as necessary: SG1...

*November 19, 2015*

**Physics**

Density of lead is 11.36g/cm3 and density of brass is 8.553g/cm3 but I was not given the lenghts of anything. The info above was the only thing given to me.

*November 19, 2015*

**Physics**

How do I do that to answer my question?

*November 19, 2015*

**Physics**

A set of density rods is designed to illustrate the concept of density. The idea is to create cylinders of equal diameters and masses, but varying lengths, to show which have the largest and smallest densities. How do I do it?

*November 19, 2015*

**Physics**

If you want to design a set of five density rods (made of aluminum, iron, copper, brass, and lead), determine the ratios of the lengths of each rod to the length of the lead rod, the densest material in the group. The specific gravities of the elements are approximately SG ...

*November 19, 2015*

**spanish**

I have the same question and I don't know the answer! can you help me?

*November 14, 2015*

**Math (Algebra)**

Two groups went to the movies. The first group included 3 adults and 5 kids and paid a total of $71. The second group included 5 adults and 3 kids and paid a total of $81. If ticket prices were the same for each group, find the cost of each type of ticket.

*November 5, 2015*

**health**

it's B all the way!

*November 2, 2015*

**Math**

Thank you.

*October 27, 2015*

**Math**

would the answer be: A=1*W 18x24 = 432

*October 27, 2015*

**Math**

How many 1 inch squares can be cut from an 18"x24" piece of contruction paper

*October 27, 2015*

**Physics**

A spring that has a spring constant of 150 N/m is oriented vertically with one end on the ground. (a) What distance does the spring compress when a 4-kg object is placed on its upper end? in m. (b) By how much does the potential energy of the spring increase during the ...

*October 23, 2015*

**History**

what was 14?

*October 19, 2015*

**chemistry!!!!!!!!!**

at 20°C the concentration of O2 in the air is 8.65 x10-3 mol/L. what us the minimum volume of air in litres that are required to completely combust on e litre of gasoline at 20°C? Assume the gasoline is octane which has a density of .703 g/mol at this temperature. The ...

*October 19, 2015*

**Physics **

At t=0 a particle leaves the origin with a velocity of 5.0 m/s in the positive y direction, its acceleration is given by a=3i-2j m/s^2 At the instant the particle reaches its maximum y coordinate, how far is it from the origin? I'm not sure how to do a question like this, ...

*October 17, 2015*

**science**

I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon strikes a metal surface...

*October 16, 2015*

**Chemistry **

I have a metal sheet of indium, and when a uv light with a wavelength of 265 nm is shone on it the surface ejects electrons that have a kinetic energy of 8.31x10^-20 J per ejected electron. I'm asked to find the threshold frequency, I need to know how to find it.

*October 14, 2015*

**chemistry**

Mercury and gallium

*October 14, 2015*

**science**

The concentration of sodium chloride in ocean water is on average 0.060 M. What mass of sodium chloride is present in 25 L of ocean water? How do I answer this question, I have no idea where even to start.

*October 14, 2015*

**biology**

why is anaphase the shortest stage in the cell cycle?

*October 14, 2015*

**Algebra**

a). The length of the classroom is 30 ft. The length of the room on the scale drawing is 6 in. Is this correct? Explain why or why not. Michael has made a scale drawing of his classroom. The scale for his drawing is 0.5 in. : 3 ft. b). One of the student tables is 6 ft long. ...

*October 4, 2015*