# Posts by andy

Total # Posts: 940

**calculus**

so what is the answer to the question?

*July 20, 2013*

**calculus**

If f(x)=∫ (from -x to x) cos(t)/(1+e^t) dt and x=asin(77/85), then the absolute value of f′(x)−f(x) can be expressed as a/b, where a and b are coprime positive integers. What is the value of a, and what is the value of b?

*July 20, 2013*

**calculus**

f(x) and f′(x) are continuous, differentiable functions that satisfy f(x)=x^3+4x^2+∫ (from 0 to x)(x−t)f′(t) dt. What is f′(5)−f(5)?

*July 20, 2013*

**calculus (point me in the right direction please?)**

but how would you get f(5)?

*July 19, 2013*

**calculus (point me in the right direction please?)**

f(x) and f′(x) are continuous, differentiable functions that satisfy f(x)=x^3+4x^2+∫(from 0 to x)(x−t)f′(t) dt. What is f′(5)−f(5)?

*July 19, 2013*

**calculus (point me in the right direction please?)**

thank you steve!

*July 18, 2013*

**calculus (point me in the right direction please?)**

Let V be the volume of the three-dimensional structure bounded by the region 0≤z≤1−x^2−y^2. If V=a/bπ, where a and b are positive coprime integers, what is a+b?

*July 18, 2013*

**physics**

114 mm Hg = 15198.75 pascals 16.0 cm^2 = 0.0016 m^2 P=F/A 15198.75=F/0.0016 F=24.318 newtons

*July 18, 2013*

**calculus**

he volume of the solid obtained by rotating the region bounded by x=(y−2)^2 and y=x about the x-axis has the form N/2π. What is the value of N?

*July 18, 2013*

**calculus**

oops! Thanks for the help

*July 18, 2013*

**calculus**

alright, so i got that f'(x)=4x^3-76x^2+4ax =4x(x^2-19x+4a) since this must never equal 0, it must have no solutions. Therefore, x must not be 0 and x^2-19x+4a must not be 0. For that to occur, 289-16a<0, so a > 18.0625. Can you please check me work? Sorry for ...

*July 18, 2013*

**calculus**

How many positive integers a (<1000) are there such that the function f(x)=x^4−76/3x^3+2ax^2 has no local maxima?

*July 18, 2013*

**calculus**

Are you just going to assume that any problem I ask for help on is from "Brilliant"?

*July 18, 2013*

**calculus**

How do you know anyways?

*July 18, 2013*

**calculus (could you help point me in the right direction?)**

could someone please point me in the right direction?

*July 18, 2013*

**calculus**

Let V be the volume of the three-dimensional structure bounded by the region 0≤z≤1−x^2−y^2. If V=a/bπ, where a and b are positive coprime integers, what is a+b?

*July 18, 2013*

**math**

If (x+2)f(2−x)+(2x+1)f(2+x)=1 for all real values of x, then f(18)=a/b, where a and b are coprime positive integers. What is the value of a+b?

*July 18, 2013*

**calculus**

How many integer values of a are there such that f(x)=x^+ax^2+8ax+25 has no local extrema?

*July 18, 2013*

**calculus**

A 3-dimensional structure is obtained from rotating the parabola y=x^2 about the y-axis. Each second, 2π units^3 of water is being poured into the structure from the top. When 8π units^3 of water has been poured in the structure, the instantaneous change in water ...

*July 18, 2013*

**calculus**

no, i think that ∫[0,2] π((4y)^2-(2y^2)^2) dy is 256/15π

*July 18, 2013*

**calculus**

i believe its bounded from y=0 to y=2

*July 18, 2013*

**calculus**

The area bounded by the curve 2y^2=x and the line 4y=x is rotated around the y-axis. The volume of the resulting structure can be expressed as V=a/bπ, where a and b are coprime positive integers. What is the value of a+b?

*July 18, 2013*

**calculus**

The area bounded by the curve 2y^2=x and the line 4y=x is rotated around the y-axis. The volume of the resulting structure can be expressed as V=a/bπ, where a and b are coprime positive integers. What is the value of a+b?

*July 17, 2013*

**calculus**

A 3-dimensional structure is obtained from rotating the parabola y=x^2 about the y-axis. Each second, 2π units^3 of water is being poured into the structure from the top. When 8π units^3 of water has been poured in the structure, the instantaneous change in water ...

*July 17, 2013*

**math calculus**

The volume of the solid obtained by rotating the region bounded by y=x^2−2x and y=x about the line y=9, has the form a/bπ, where a and b are positive coprime integers. What is the value of a+b?

*July 17, 2013*

**physics**

no its wrong!

*July 17, 2013*

**physics**

A clock is made out of a disk of radius R=10 cm which is hung by a point on its edge and oscillates. All of a sudden, a circular part right next to the hanging point of radius R/2 falls off, but the clock continues oscillating. What is the absolute value of the difference in s...

*July 17, 2013*

**physics**

Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 ...

*July 17, 2013*

**math (please help steve)**

Brilli the ant randomly placed a token into a square on a 2×100 chessboard according to a probability distribution P. The token is then moved uniformly at random to one of the horizontally, vertically, or diagonally adjacent squares. The probability that the token is in ...

*July 17, 2013*

**math**

Brilli the ant is considering the complexities of a 5-dimensional universe. She wants to count the number of integer points that are distance sqrt(n) away from the origin. Let Tn be the set of ordered 5-tuples of integers (a1,a2,a3,a4,a5) such that a1^2+a2^2+a3^2+a4^2+a5^2=n....

*July 17, 2013*

**physics**

Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 ...

*July 17, 2013*

**chemistry**

Make the epoxide of the trans alkene with McPBA. Open with tributyl phosphine. This will intercept the Wittig mechanism (after rotation of the C-C bond bewteen the carbons baring the oxygen and phosphonium), and you will lose the phosphine oxide and form the cis alkene.

*July 11, 2013*

**Maths**

f(x)is a function differentiable at x=1 and f'(1)=1/8. what is the value of f(x)-f(1) f'(x) denotes the derivative of f(x)

*May 24, 2013*

**Math**

I mean 4 cups not 2 cups

*May 23, 2013*

**Math**

No because he has 2 cups. It doesn't equal a gallon. 1 gallon = 16 cups.

*May 23, 2013*

**math**

So far they have $5000 in their fund. Timmy gave $450. Donna gave $900. How much did Kathy give? A. $4550 B. $4100 C. $3700 D. $365

*May 23, 2013*

**math**

Simplify.is what? 42 Ã· 6 + {1 · 7 - [7 + (6 - 1)]} A. 12 B. 2 C. 28 D. 14

*May 23, 2013*

**math**

Simplify. is What? 125 · 24 Ã· 6 + (8 - 1) A. 493 B. 509 C. 507 D. 500

*May 23, 2013*

**math**

Simplify. how can this be simplified? 42 Ã· 6 + {1 · 7 - [7 + (6 - 1)]}

*May 23, 2013*

**math**

Round 35,554,100 to the nearest ten thousand. is what Round 35,554,100 to the nearest ten thousand. A. 35,554,100 B. 35,550,000 C. 35,554,000 D. 36,000,000 ?

*May 23, 2013*

**augusta teh**

The sundae contained almost 40,741 pounds of ice cream and almost 10,580 pounds of syrup and topping. How many pounds did the sundae weigh?

*May 23, 2013*

**math**

39

*May 23, 2013*

**Algebra**

f(x) is a function differentiable at x=1 and fŒ(1)=1/8. What is the value of f(x)-f(1) f'(x) denotes the derivative of f(x)

*May 21, 2013*

**math**

If sin57=m Express the following 1. sin 237 2. Cos 33 3. Cos 3 4. Cos 66

*May 19, 2013*

**math**

Pls help

*May 19, 2013*

**Science (chemistry) help please**

The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. I don't know what to do? I know ...

*May 14, 2013*

**matter**

why is it important too descibe and compare matter

*April 29, 2013*

**matter**

why is it important too descibe and compare matter

*April 29, 2013*

**Probabilities**

Bibi wants to send invitations to some of her friends to come to her birthday party. She has contact information for 37 friends stored on her phone, but she only wants to invite 21 of those people to her party. She tries to send out a message to the 21 people, but her phone ...

*April 25, 2013*

**Midpoint Help / Math**

M(-4,-2) is the midpoint of RS. If S has coordinates (-2,5), find the coordinates of R.

*April 23, 2013*

**landmark project**

You can ask , What is the area of the Palace of Fine Arts ? Where is it located ? Who is the architect ?

*April 23, 2013*

**Algebra**

Suppose f(x) is some polynomial such that x−45 is a factor of f(x) . What value of x must be a root of f(x)=0 ?

*April 19, 2013*

**Geometry**

Circle G with center O is tangential to PA at A . Line PO extended intersects G at B (PO<PB ). C is a point on AB such that PC bisects angle APB .What is the measure (in degrees) of angle PCA ?

*April 16, 2013*

**Quantum Physics**

guess the right answer for 5a and don't forget to write CAPITAL K

*April 16, 2013*

**Quantum Physics**

Gyus, 5 is easier than you think! It takes exactly m steps from starting superposition (ay = 1/sqrt(K), ax = 1/sqrt(k)) to get to the solution (ay = 1, ax = 0), then it takes exactly m+1 steps to get back to initial state, but after each cycle the sign changes! So it looks ...

*April 16, 2013*

**Statistics**

The lifetime of computer chips is approximately normal with mean 1.4×106 hours and standard deviation 3×105 hours. The statistics department has 5 computers built with that chip as the main component. What is the probability that all 5 computers last longer than 1....

*April 12, 2013*

**Geometry**

Arpit is thinking of a 2-digit number where the tens digit is twice the ones digit. How many different numbers can Arpit be thinking of?

*April 11, 2013*

**Geometry**

ABC is a triangle with circumcenter O, obtuse angle BAC and AB less than AC. M and N are the midpoints of BC and AO respectively. Let D be the intersection of MN with AC. If 2AD=(AB+AC), what is the measure of angle BAC ?

*April 11, 2013*

**World Geography**

what is an area with one or more ccommon characteristics

*April 5, 2013*

**computer programming**

I need help with this problem please: Create the logic for a program that accepts input values for the projected cost of a vacation and the number of month until vacation. Pass both values to a method that displays the amount you must save per month to achieve your goal. Use ...

*March 31, 2013*

**MATH**

IF CATHY IS 24 YEARS OLD, HOW OLD WILL CATHY BE IN Y YEARS? Y - 24 Y + 24 24 - y 24 / Y

*March 27, 2013*

**German**

correct

*March 25, 2013*

**Earth Science**

If a sample contains 70g of Carbon 14 and 70g of Nitrogen 14, how many half lives has it undergone? (show all of your work)

*March 21, 2013*

**algebra 1**

A salesperson at a clothing store earns a 5% commission on all sales. How much commission does the sale person earn on a 300$ sale?

*March 7, 2013*

**Physics**

Okay its like 98.8 or something...you have to convert miles per hour to meters per second. Then do (1/2)(Mass)(velocity) that'll give you your kinetic energy (work). Divide that by time to get Power. Remember, it gives you your answer in watts but Rawwaga's answers are...

*February 28, 2013*

**Engineering Economy**

What is the future worth of $1,000 in month 1, $1,040 in month 2, and amounts increasing by $40 per month through month 12, at the end of year 2 if the interest rate is 23.7631528% per year, compounded continuously?

*February 26, 2013*

**Physics**

A mass is attached to a spring stretches it 2.5 cm from equilibrium. The mass is lightly tapped and set in an oscillation. What is the angular frequency of the of the oscillation?

*February 19, 2013*

**Math**

What is the minimum value of N that will make this statement true: If we pick any N composite numbers from 1 to 1000, then we can find 2 numbers whose greatest common divisor is not 1.

*February 15, 2013*

**ENG1511**

My cat is playful

*February 15, 2013*

**Math (Pre-Cal)**

The infinite series S = 1/5 + 3/5^3 + 5/5^5 + 7/5^7 + 9/5^9 + ... converges. Find S.

*February 11, 2013*

**Physics**

A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.95 s after leaving the dock has a magnitude of 6.7 m. What is the car's speed at the instant it drives off the edge of the dock?

*February 9, 2013*

**physics**

whaat happens to the potential energy lost by hammer of pile driver when it falls through a distance and drives a piling into the ground?

*February 7, 2013*

**geometry**

The measures of two consecutive angles of a parallelogram are in the ratio 5:4. What is the measure of an acute angle of the parallelogram?

*February 3, 2013*

**Concrete on different temperature?**

if a section of concrete is poured for a road and the engineer leaves no gap between sections poured before and after the section in question , what will happen to concrete if the temperature varies from 0 C to 40 C ? Assume that the initial temperature of the pouring was 17 ...

*December 11, 2012*

**Mechanics of Materials**

the propane gas tank has an inner diameter of 1500mm and wall thickness of 15mm. If the wall is pressurized to 2MPa, determine the absolute maximum shear stress in the wall of tank.

*December 11, 2012*

**Margaret**

1. Contemporary 2. Proponent 3. Prevalent 4. Contend 5. Charisma 6. Extrovert 7. Poignant 8. Conversely 9. Quest 10. Traumatic

*December 8, 2012*

**Math**

If A represents the number of apples purchased at 15 cents each, and B represents the number of bananas purchased at 10 cents each, which of the following represents the total value of the purchases in cents? a) A+B b) 25(A+B) c)10A+15B d) 15A+10B

*November 30, 2012*

**physics**

A helicopter hovering above a forest fire dumps a large bucket of water. How far does the water fall during the third second?

*November 14, 2012*

**Phyisics**

Once a 26 kg crate is in motion on a horizontal ﬂoor, a horizontal force of 64 N keeps the crate moving with a constant velocity. The acceleration of gravity is 9.81 m/s 2 . What is µk, the coeﬃcient of kinetic friction, between the crate and the ﬂoor?

*November 13, 2012*

**Physics**

A box of books weighing 328N moves with a constant velocity across the floor when it is paged with a force of 385N exerted downward at an angle of 25.3 below the horizontal. Find muK between the box and the floor

*November 6, 2012*

**Physics**

Consider the 56 N weight held by two cables shown below. The left hand cable is horizontal. What is the tension in the cable slanted at an angle of 38degrees

*November 6, 2012*

**Physics**

A 2.01 kg block starts from rest at the top of a 25.8degree incline and accelerates uniformly down the incline, moving 2.13m in 2.98 seconds. What is the magnitude of the acceleration of the block?

*November 6, 2012*

**algebra**

Suppose there are only enough tutors for 12 fifth graders to attend tutoring . What is the domain and range of the function in Y=.40x

*November 4, 2012*

**Physics**

Use the equation Pfluid=Density x height x gravity (1000)(1.9)(9.8)=18,620 The TOTAL absolute pressure on the bottom and against the sides of the swimming pool is 18,620 + 1.01x10^5 = 119,620 Pa Use the equation Pressure = Force/Area Rearrange the equation to Force = Pressure ...

*November 3, 2012*

**elementary**

I could've said how much more instead of how many. That would be more understanding for me.

*October 29, 2012*

**LATIN**

Obey the divine law and tell us the truth now! I need help translating these into Latin please

*October 23, 2012*

**Calc**

Thank you both for your help

*October 23, 2012*

**Calc**

Air pressure at sea level is 30 inches of mercury. At an altitude of h feet above the, air pressure, P, in inches of mercury, is given by, P =30e^(-3.23x10-5h) a)Find th equation of the tangent line at h=0. b)A rule of thumb is given by travelers is that air pressure drops ...

*October 23, 2012*

**Calculus**

Air pressure at sea level is 30 inches of mercury. At an altitude of h feet above the, air pressure, P, in inches of mercury, is given by, P =30e^(-3.23x10-5h) a)Find th equation of the tangent line at h=0. b)A rule of thumb is given by travelers is that air pressure drops ...

*October 22, 2012*

**accounting**

Okay so I need help Identifying the reporting issues in this case with references to the conceptual framework pyramid, such as revenue recognition, full disclosure, historical cost, etc. So this gym offers one year memberships. Members can use any of the facilities but must ...

*October 22, 2012*

**Physics**

max gravitational force=1.282 x min gravitational force. therefore, rmax^2/rmin^2=1.282 square root both sides

*October 15, 2012*

**Math**

67.5

*October 13, 2012*

**statistics - probability**

A total of 16 mice are sent down a maze, one by one. From previous experience, it is believed that the probability a mouse turns right is .38 a) What is the probability that 8 or fewer turn right? b) What is the probability that 8 or more turn right? c) What is the probability...

*October 12, 2012*

**College US History**

because god told them to

*October 9, 2012*

**Physics**

1. What is absolute uncertainty? (+one example) 2. What is relative uncertainty? (+one example)

*October 7, 2012*

**Maths**

Thank you ...

*October 1, 2012*

**Maths**

Hi, I am working on some Nth problems - can anyone tell me if this is correct :- Nth term sequence is n + 4 are the first three terms 5,6,7, A nth term is 85 - 5n are the first three terms of the sequence 17, 34, 51, A nth term is 2n - 0.5 are the first three terms of the ...

*October 1, 2012*

**physics**

Traveling at a speed of 18.3 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.540. What is the speed of the automobile after 1.33 s have elapsed? Ignore the effects of ...

*September 18, 2012*

**physics**

A 4.85-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.440. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an ...

*September 18, 2012*

**physics**

A diver springs upward from a board that is 3.90 m above the water. At the instant she contacts the water her speed is 14.9 m/s and her body makes an angle of 60.3 ° with respect to the horizontal surface of the water. Determine her initial velocity, both (a) magnitude and...

*September 15, 2012*