Saturday

February 13, 2016
**Calculus, HELP!!!!!!!!!**

A cable runs along the wall from C to P at a cost of $6 per meter, and straight from P to M at a cost of $10 per meter. Let x be the distance from C to P. If M is 8 meters from the nearest point A on the wall where P lies, and A is 18 meters from point C, find x such that the ...
*Tuesday, March 3, 2015 by Francois*

**Calculus I**

A spherical balloon is inflated at a rate of 10 cm^3/min. How fast does the radius change when the radius is 20 cm? Need help with set up and work through of problem.
*Monday, March 2, 2015 by Mike*

**Calculus I**

Sand falls from a hopper into a conical pile with radius equal to half its height. The sand is poured at a rate of 3 m^3 each minute. How fast is the radius increasing after 10 minutes? Need help with the set up and work through of the problem.
*Monday, March 2, 2015 by Mike*

**Calculus Physics**

Imagine a spaceship on its way to the moon from the earth. Find the point, as measured from the center of the earth, where the force of gravity due to the earth is balanced exactly by the gravity of the moon. This point lies on a line between the centers of the earth and the ...
*Monday, March 2, 2015 by danny*

**Calculus Physics**

A glass of orange juice is on the floor of a subway car traveling along a straight path at constant velocity. Everything's fine. The coefficient of static friction between the glass and the floor is 0.32. The subway suddenly accelerates forward. What is the maximum ...
*Monday, March 2, 2015 by danny*

**Calculus 2**

Can someone please show and explain step by step how to evaluate this integral? Problem #1)∫ 1/(x^3+x^2+x+1) dx This is what I got so far. I am not sure what to do thereafter after doing partial fraction decomposition (in which I got A = 1/2, B = 1/2, and C = 1/2) 1/(x^2...
*Monday, March 2, 2015 by Miki*

**calculus**

Plot three points with first coordinate equal to (-2.8) and join them
*Sunday, March 1, 2015 by hadasha*

**Calculus**

(1/sqrt(1-(3x/4)^2) * 3/4
*Sunday, March 1, 2015 by Sandra*

**Math Calculus (ALEVEL)**

Find the equation of the tangents to the curve x^2+3x-2y^2=4 at the points where the curve crosses the x- axis
*Sunday, March 1, 2015 by Anonymous*

**Calculus**

Find the area of the bounded region by the graph of x=2y-3 and x=y^2-2y in two ways (i) using x axis as refrence y axis (ii) using y axis as refrence x axis
*Sunday, March 1, 2015 by Akki*

**Calculus**

Find out the partial derivative w.r.t 'x' and 'y' of f (x,y) = log(y) x Now, log(y) x = ln x / ln y Partial Diff w.r.t 'x' = 1/ x ln y so can you find out what will be the partial derivatives w.r.t 'y'
*Sunday, March 1, 2015 by Akki*

**Calculus (Partial Derivatives)**

A car dealer determines that if gasoline-electric hybrid automobiles are sold for x dollars apiece and the price of gasoline is y cents per gallon, then approximately H hybrid cars will be sold each year, where H(x,y)=6000−13x^(1/2)+2(0.1y+20)^(3/2). She ...
*Saturday, February 28, 2015 by Bill*

**Calculus (Partial Derivatives)**

Using x hours of skilled labor and y hours of unskilled labor, a manufacturer can produce Q(x,y)=40xy1/5 units each week. Currently 20 hours of skilled labor and 243 hours of unskilled labor are being used. Suppose the manufacturer reduces the skilled labor level by 2 hours ...
*Saturday, February 28, 2015 by Bill*

**calculus 2 extremely difficult**

The function is r(t)= 400texp(-0.2t^2) and it shows the rate at which people show up in a line outside a theatre to buy tickets. t is the number of hours after 8:00am Assume there is no people at 8:00am and the patrons are served at a constant rate of 200 people after the ...
*Saturday, February 28, 2015 by Integration*

**calculus**

Find the area between the curves y=x^2 & x=2?
*Saturday, February 28, 2015 by Akki*

**calculus**

Find the area of the region bounded by the curves y=x^2 & y=2x???
*Saturday, February 28, 2015 by Akki*

**calculus**

Find relative Minimum and Maximum f'(x) = (9-4x^2)/ (x+1)^1/3
*Saturday, February 28, 2015 by Akki*

**Pre-calculus (Trigonometry)**

The rotating spotlight from the Coast Guard ship can illuminate up to a distance of 250 m. An observer on the shore is 500 m from the ship. HIs line of sight to the ship makes an angle of 20 degrees with the shoreline. What length of shoreline is illuminated by the spotlight...
*Friday, February 27, 2015 by Lucina*

**calculus**

limx¨0 sin ^3 (3x)/ x sin(x ^2)
*Friday, February 27, 2015 by Tuhafeni*

**Calculus**

Find an equation of the normal line to the parabola y=x^2−8x+1 that is parallel to the line x−6y =7.
*Thursday, February 26, 2015 by TayB*

**Calculus II**

A square plate of side 3 m is submerged in water at an incline of 30 degrees with the horizontal. Calculate the fluid force on one side of the plate if the top of the plate lies at a depth of 6 m. (* The only thing i can think to use is the equation: p * g * (S from a to b of...
*Thursday, February 26, 2015 by Alex*

**linear algebra**

Let V be the set of all real-valued continuous functions defined on R1. If f and g are in V, we define f ⊕ g by (f ⊕ g)(t) = f(t) + g(t). If f is in V and c is a scalar, we define c f by (c f)(t) = cf(t). Then V is a vector space, which is denoted by C(−&#...
*Thursday, February 26, 2015 by kirsten*

**Calculus**

Differentiate the function. y = e^(x+2)+8 y'=?
*Thursday, February 26, 2015 by TayB*

**Calculus**

Find an equation of the tangent line to the curve at the given point. y =x^4+4x^2−x,(1,4) y=?
*Thursday, February 26, 2015 by TayB*

**Calculus**

Differentiate the function. g(u) = sqrt(2)u+sqrt(7u) g'(u)=?
*Thursday, February 26, 2015 by TayB*

**math**

let V be the set of all real-valued continuous functions defined on R1. If f and g are in V, we define f ¨’ g by (f ¨’ g)(t) = f(t) + g(t). If f is in V and c is a scalar, we define c f by (c f)(t) = cf(t). Then V is a vector space, which is denoted by C(&#...
*Thursday, February 26, 2015 by sara*

**calculus**

Salmonella bacteria, found on almost all chicken and eggs,grow rapidly in a nice warm place. If just a few hundredbacteria are left on the cutting board when a chicken is cut up,and they get into a potato salad, the population beginscompounding. suppose the number present in ...
*Thursday, February 26, 2015 by Trang Thuy Doan*

**Calculus**

Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line. y= 2e^(−x), y= 2, x= 6; about y = 4. How exactly do you set up the integral? I know that I am supposed to use the washer method but I can't figure out...
*Thursday, February 26, 2015 by Jed*

**Calculus Chain rule**

y = (6x^2-6)^4/x I would appreciate it more if work was shown. Thank you (I have the answer but want to know how to do it)
*Wednesday, February 25, 2015 by Tom*

**Calculus 2 II**

integral from 0 to 1 of x-4/(x^2-5x+6) I do believe we can integrate with partial fractions, and I should factor it in order to create a linear case 1 thingy so then, it will be: x-4/(x-2)(x-3) After that, I will find the value of a/(x-2) + b/(x-3). But I suck at matrices but ...
*Wednesday, February 25, 2015 by Hanky7*

**calculus**

Describe three situations in which you may want to know the projection of one vector onto another.
*Wednesday, February 25, 2015 by ffej*

**College Math (Calculus)**

Suppose the length of a rectangular box, with lengths x,y,z are changing at the following rates dx/dt = 2 cm /sec dy/dt = -3 cm /sec dz/dt = 1 cm/ sec when x =4, y=3 z=2, Find i) Rate at which volume is changing wrt time, ii) Rate at which the diagonal length of the box is ...
*Wednesday, February 25, 2015 by Wboy*

**Calculus**

1.) Find the derivative of tan (sec x). 2.) Find the derivative if 1/x in four ways, using the limit process, power rule, quotient rule and implicit differentiation. 3.) Show that the derivative of sec^-1 x is 1/(|x|*sqrt(x^2 -1)). 4. Find the derivative of 2^(e^(sin x)). ...
*Tuesday, February 24, 2015 by Anonymous*

**Pre-Calculus(Trigonometry)**

An 8-m boom is used to move a bundle of piping from point A to point B. Determine the exact vertical displacement of the of the boom when the operator moves it form 30 degrees to 60 degrees. (Just need work checked) --------------------------------------- I drew two triangles ...
*Tuesday, February 24, 2015 by Lucina *

**Pre-Calculus ( Trigonometry)**

The point P(k, 24) is 25 units from the origin. If P lies on the terminal arm of an angle, theta, in standard position, 0 < theta < 360,determine the measure of theta. Unsure how to go on from here. I'd appreciate if someone can guide me through the first few steps ...
*Tuesday, February 24, 2015 by Lucina*

**Calculus**

Let a thing rod of length a have a density distribution function p(x)+10e^(-.1x), where x is measured in cm and p in grams per centimeter. A) if the mass of the rod is 30 g, what is the value of a? B) For the 30g rod, will the center of mass lie at its midpoint, to the left, ...
*Tuesday, February 24, 2015 by Lauren*

**business math**

A local Barnes and Noble paid a $79.44 net price for each calculus textbook. The publisher offered a 20% trade discount. What was the publisher’s list price?
*Tuesday, February 24, 2015 by melanie*

**[Calculus] U-substitution for Integrals**

Integral of cos(x)*a^sin(x) + C dx = Integral of cos(x)*sin(x)^a + C dx = Let a be a fixed positive number. I'm clueless is to how to solve for a...
*Monday, February 23, 2015 by Ian*

**[Calculus] U-substitution for Integrals**

Integrate from 1 to 5 of (3x-5)^5 dx = Integrate from a to b of f(u) du where (I have solved this part) u = 3x-5 du = 3 a = 0 b = 12 The original value of the integral is 165888 via calculator here's my last question, and it has to be in terms of u: f(u) = ? (Again, in ...
*Monday, February 23, 2015 by Ian*

**Calculus 2**

Consider a trough with triangular ends where the tank is 10 feet long, top is 5 feet wide, and the tank is 4 feet deep. Say that the trough is full to within 1 foot of the top with water of weight density 62.4 pounds/ft^3, and pump is used to empty the tank until the water ...
*Monday, February 23, 2015 by Lauren*

**Calculus 2**

Let a thing rod of length a have a density distribution function p(x)+10e^(-.1x), where x is measured in cm and p in grams per centimeter. A) if the mass of the rod is 30 g, what is the value of a? B) For the 30g rod, will the center of mass lie at its midpoint, to the left, ...
*Monday, February 23, 2015 by Jordan*

**calculus**

State whether or not the following statements are true. Justify your reasoning.? a. Vector a • (Vector b + Vector c) = Vector a • Vector b + Vector a • Vector c b. Vector a × (Vector b + Vector c) = Vector a × Vector b + Vector a × Vector c c. ...
*Monday, February 23, 2015 by anon*

**Pre-Calculus (Trigonometry)**

An angle in standard position such that sinÈ = 5/13. Determine the possible values of È, to the nearest degree. Answer: I got 23°. (How do I get the second one?)
*Sunday, February 22, 2015 by Lucina*

**calculus**

given the velocity of a particle traveling along the y-axis by v(t)=tsin(t^2)
*Sunday, February 22, 2015 by sam*

**Calculus**

When given the f graph, how do you determine extrema of F(x)? Concavity of F(x)?
*Sunday, February 22, 2015 by Anonymous*

**calculus**

Find the integral of (sin^5 x)(cos^5 x)
*Sunday, February 22, 2015 by tolu*

**calculus**

A woman is attached to a bungee cord from a bridge that is 38m above a river. Her height in meters above the river t seconds after the jump is y(t)=19(1 + e^-1xcos(t)) for t>0. What is her velocity at t=1 and t=4?
*Saturday, February 21, 2015 by Zee*

**Calculus**

Evaluate: the integral from pi/8 to pi/6 csc2xcot2xdx
*Saturday, February 21, 2015 by Anonymous*

**Calculus**

Evaluate by U-substitution: the integral of xcubedroot(x-2) dx
*Saturday, February 21, 2015 by Anonymous*

**Calculus **

A spring has a natural length of 18 cm. If a 22-N force is required to keep it stretched to a length of 24 cm, how much work W is required to stretch it from 18 cm to 21 cm? (Round your answer to two decimal places.) Arg, another question that has me stumped! Would love some ...
*Friday, February 20, 2015 by Mr. Garvoti *

**Calculus **

If 54 J of work are needed to stretch a spring from 15 cm to 21 cm and 90 J are needed to stretch it from 21 cm to 27 cm, what is the natural length of the spring? Any help would be appreciated!
*Friday, February 20, 2015 by Mr. Garvoti *

**AP calculus**

If 54 J of work are needed to stretch a spring from 15 cm to 21 cm and 90 J are needed to stretch it from 21 cm to 27 cm, what is the natural length of the spring?
*Friday, February 20, 2015 by Sam*

**Calculus Physics**

A 1559-kg car moves at 15.0 m/s. What is the magnitude of the horizontal net force needed to bring the car to a halt in a distance of 50.0 m?
*Thursday, February 19, 2015 by danny*

**Calculus Physics**

A particle is subject to a time-dependent force: F(t)=5t√. If the particle's mass is 7 kg, what will its velocity be at t=6.7 seconds, assuming its initial velocity at t=0 is equal to 0.
*Thursday, February 19, 2015 by danny*

**Algebra**

How do you know which rule to use when it doesn't specify? All it says is find the derivative of the function. I haven't had algebra/calculus in over 20 years, I'm completely lost. Please help
*Thursday, February 19, 2015 by Averi*

**business math**

How do you know which rule to use when it doesn't specify? All it says is find the derivative of the function. I haven't had algebra/calculus in over 20 years, I'm completely lost. Please help.
*Thursday, February 19, 2015 by Averi*

**Calculus**

On planet Calculi, acceleration due to gravity is -20 ft/sec^2. A ball is thrown upward with an initial velocity of 40ft/sec from an initial height of 50. a) Write the equation for the height of the ball, s(t), at time t. b) Find the velocity when the ball hits the ground. c) ...
*Thursday, February 19, 2015 by Anonymous*

**calculus**

When an oil well burns, sediment is carried up into the air by the flames and is eventually deposited on the ground. Less sediment is deposited further away from the well. Experimental evidence indicates that the density (in tons per square mile) at a distance r in any ...
*Thursday, February 19, 2015 by Randy*

**Calculus**

A spherical balloon with radius 3 inches is partially filled with water. If the water in the balloon is 4 inches deep at the deepest point, how much water is released when the balloon hits the wall and breaks?
*Wednesday, February 18, 2015 by Andy*

**Calculus Physics**

A particles with mass 3.7 kg moves in the x direction according to the following function: x(t)=−7+4t+3t2−4t3. (the units of each coefficient are meters, and time is measured in seconds). At time t=7.8, what is the net force acting on the particle?
*Wednesday, February 18, 2015 by danny*

**Calculus Physics**

A box and one force vector, F1 is shown. F1 = + 10 N. If the mass of the box is 3 kg, what is the magnitude and direction of a force, F2, that would need to be applied if the box was to have an acceleration of + 2 m/s 2 in the horizontal direction. (Indicate direction by ...
*Wednesday, February 18, 2015 by danny*

**Calculus**

Find the volume of the solid obtained by rotating the region bounded by y=8x+24, y=0 about the y-axis.
*Wednesday, February 18, 2015 by Cole*

**Pre-calculus**

Find the first two terms of a geometric sequence if t_3+ t_4 = 50 and t_4 + t_5 =100? t3= a(r^2) t4= a(r^3) t5= a(r^4) a(r^2)+ a(r^4)= 100 ------------------------- a(r^3)+ a(r^4) = 50 ar^3 ----- = 2 ar^2 r = 2 <-------
*Tuesday, February 17, 2015 by Lucina*

**Pre-Calculus**

Q.Determine the sum of each infinite geometric series. t_1= 8 r = -2^1/2 ---------------------------------------- A.This is a divergent series because the absolute value of r is greater than 1. ---------------------------------------- Q. The first term of an ...
*Tuesday, February 17, 2015 by Lucina*

**Calculus**

A craftsman wants to make a cylindrical jewelry box that has volume, V, equal to 60 cubic inches. He will make the base and side of the box out of a metal that costs 50 cents per square inch. The lid of the box will be made from a metal with a more ornate finish which costs ...
*Tuesday, February 17, 2015 by Shyan*

**calculus A**

A particle moves according to a law of motion s = f(t) = t3 - 12t2 + 21t, t 0, where t is measured in seconds and s in feet. v(t) = 3t^2 - 24t 21 a(t) = 6t - 24 e) Find the total distance traveled during the first 8 s. i) When is the particle speeding up? (Enter your answers ...
*Tuesday, February 17, 2015 by sohee*

**Calculus**

If f(x) = x4 + 6x,find f'(x).
*Tuesday, February 17, 2015 by Tay Tay*

**Calculus Chain rule**

How can derive this function?f(x) = 2/(9x^5+1)^5 The answer is The answer is -450x^4/(9x^5+1)^6 Can you please show why? Thank you
*Tuesday, February 17, 2015 by Tom*

**Calculus: Optimization**

I have no idea how to approach this problem, if someone knows just how to relate h, r with H,R, that would be extremely helpful and I can workout the rest! Thank you in advance. Given a right circular cone, you put an upside-down cone inside it so that its vertex is at the ...
*Tuesday, February 17, 2015 by Jazz*

**calculus 3**

A golf ball is driven down a horizontal fairway with an initial speed of 55m/s at an initial angle of 25 degrees. (Assume the tee from which the ball is hit is of negligible height). a). how far does the ball travel horizontally b). when does the ball land? c). what is the max...
*Tuesday, February 17, 2015 by Mark*

**calculus**

An artificially created lake is bordered on one side by a straight dam. The shape of the lake surface is that of a region in the xy-plane bounded by the graphs of 2y=16-x^2 and x+2y=4. Find the area of the surface of the lake.
*Tuesday, February 17, 2015 by Akki*

**Calculus**

Calculate the area of the bounded region between the curves y^2=x and 3y = -3y + 9 ?
*Tuesday, February 17, 2015 by Akki*

**Calculus**

Find an equation of a line tangent to y = 2sin x whose slope is a maximum value in the interval (0, 2π]
*Tuesday, February 17, 2015 by Sara*

**calculus**

s= [b]*[d]+64t-16t^2 what is the greatest height above the ground the rock will go
*Monday, February 16, 2015 by steve*

**calculus**

hi! just needed help on an FRQ for ap calculus ab. let me know if you have any questions for me. I'm just really confused as far as what I am meant to do. If you could walk me through it that would be amazing. THANKS!! A population is modeled by a function P that satisfies...
*Monday, February 16, 2015 by phoebe*

**Pre calculus**

A tugboat is traveling at 30 miles per hour at a compass heading of 38 degrees. The current is from the direction of 125 degrees moving at 7 mph. Find the resultant speed and the direction of the boat. I understand the concept and that I must use the law of cosines. I got 30^2...
*Monday, February 16, 2015 by Hanna*

**Pre-calculus **

Let z and w be complex numbers such that |2z-2|=25, |z+2w|=5, and |z+w|=2. Find |z|. I first squared both equations and expressed the square of the magnitudes in terms of the complex numbers and its conjugates. Next, I summed the equations together and attempted to solve for |...
*Monday, February 16, 2015 by majorbill*

**Pre-Calculus**

he amount M (in billion of dollars) of mortgage debt outstanding in the US from 1990 to 2001 can be approximated by the function M(t)= 29.9t^2 + 3892 where t=0 represents 1990. Rewrite the function so that t=0 represents 2000.
*Monday, February 16, 2015 by Tara*

**Calculus**

Integrate Cos^7(2x) Explanation would be helpful
*Monday, February 16, 2015 by Pen*

**Calculus**

determine the absolute extreme values of the function f(x)=sinx-cosx+6 on the interval 0<=x<=2pi. This is what i did: 1.) i found the derivative of the function which is f'(x)=cosx+sinx 2.) I set f'(x)=0 and got sinx/cosx=-1 which is tanx=-1 and then x=3π/4...
*Sunday, February 15, 2015 by Sara*

**multivariable calculus**

show that a=!0 , the equation p=2asin0cos0 describes the sphere centered(a,0,0) at radius|a|
*Sunday, February 15, 2015 by robert*

**Pre-Calculus**

If r = 1, will a sequence be convergent or divergent?
*Sunday, February 15, 2015 by Lucina*

**calculus**

Find limit of 2x+1-cosx/3x as x approaches 0?
*Sunday, February 15, 2015 by sential *

**Calculus**

Can someone please explain how to solve this type of question? Determine the maximum and minimum value of the function f(x)=3x3^x - 1
*Saturday, February 14, 2015 by Sara*

**Calculus**

would the derivative of f(x)=(7^x)(x^7) be f'(x)=(7^x ln7) (7x^6)?
*Saturday, February 14, 2015 by Sara*

**Calculus**

a certain radioactive substance is decaying so that at time t, measured in years, the amount of the substance, in grams, is given by the function f(t)=3e^-3t. What is the rate of decay of the substance after half a year: I first found the derivative of f(t)=3e^-3t which is f&#...
*Saturday, February 14, 2015 by Sara*

**Calculus**

How would I answer this question? Differentiate the function f(x)=sqrt(cosxsinx)
*Friday, February 13, 2015 by Sara*

**Calculus**

1. is the derivative of the function f(x)=5e^(4x-9z) f'(x)= -25e^(4x-9z)? 2. Is the derivative of the function f(x)=e^(2x)-e^(-2x) f'(x)=2e^(2x)+2e^(-2x)? 3. If f(x)=e^-x^-1, would f'(2)=-1/4e^(1/4)?
*Friday, February 13, 2015 by Sara*

**Calculus help and please check answer for a)**

The decay of a certain substance is modeled by the function N(t)=100(3+e^(-t/3), where the number of particles is represented by N in a time of t hours. a) what is the initial number of particles? - I set t as 0 and got an answer of 400 particles initially b) determine the ...
*Friday, February 13, 2015 by Sara*

**math calculus**

what is the difference between the function 2^x and (1/2)^x?
*Friday, February 13, 2015 by Sara*

**Calculus**

A wealthy patron of a small private college wishes to endow a chair in mathematics with a gift of G thousand dollars. Suppose the mathematician who occupies the chair is to receive $110 thousand dollars per year in salary and benefits. If money costs 8% per year compounded ...
*Friday, February 13, 2015 by C*

**calculus- min value of function**

The answer is -1/2 but how? Which of the following is the minimum value of the function f(x)= sinxcosx? a) 0 b) -1/2 c) -1 d) does not exist
*Friday, February 13, 2015 by Sara*

**Calculus**

I am not too sure if I did this question correct. Thanks in advanced! Data table: Time after Consumption (min): 30 60 90 120 150 180 Amount of Codeine in Blood (mg): 27.0 23.5 21.2 18.7 16.6 14.5 1.) create a scatter plot of the data and determine a suitable equation to model ...
*Friday, February 13, 2015 by Sara*

**pre- calculus**

In how many ways can a family of six be seated at a round table if the mother and father must sit together?
*Friday, February 13, 2015 by Anonymous*

**Calculus**

Let f(x)=cosxsqrt(1+sinx). A. Let F(x)=the integral of f(x)dx and F(0)=5/3, find F(pi/2). I got 3.386 with U-substitution B. If G(x)=the integral of f(x)sinxdx and G(0)=1/3, find G(x). I got a reply to this but I did not understand the explanation. How would I solve this with ...
*Friday, February 13, 2015 by Anonymous*

**Pre-Calculus**

Each second after shut-off, the speed of the blade is 2/3 of the speed in the previous second. After the first 8 s, the saw has turned 258 times. What was the speed of the saw before the motor shut off, to the nearest tenth of a turn per second? I get 805.4 but I don't ...
*Friday, February 13, 2015 by Lucina*

**calculus**

Two forces of 7 lb. and 14 lb. act on a body at right angles to each other. Find the angle their resultant force makes with the force of 14 lb.
*Friday, February 13, 2015 by Jasmine*

**Calculus**

The integral of sin(7x)cos(7x)dx
*Friday, February 13, 2015 by Anonymous*

**Calculus**

Integration with substitution The integral of f'(g(5x))g'(5x)dx
*Friday, February 13, 2015 by Anonymous*

**Calculus**

Let f(x)=cosxsqrt(1+sinx) A. If F(x)=the integral of f(x)dx and F(0)=5/3, find F(pi/2). B. If G(x)=the integral of f(x)sinx dx and G(0)=1/3, find G(x).
*Friday, February 13, 2015 by Anonymous*