Sunday

May 29, 2016
**Calculus**

Let f(x) be defined by f(x) = x/(x - 4). What is the image of f?
*Sunday, March 27, 2016 by Dan*

**Calculus**

The function f(x) = x^3 + x an inverse. Compute f^-1(0) and f^-1(2). Hint: Do not try to evaluate f^-1 explicitly.
*Sunday, March 27, 2016 by Dan*

**Calculus**

An artifact was found with 63.8% of Carbon 14, how old is the mummy, assuming the half-life of Carbon 14 is 5730 years.
*Sunday, March 27, 2016 by Homework Help*

**calculus**

Find the absolute extrema of the function on the closed interval. y = 1 − |t − 1|, [−9, 6]
*Sunday, March 27, 2016 by Sagar*

**calculus**

Find the acceleration of the specified object. (Hint: Recall that if a variable is changing at a constant rate, its acceleration is zero.) A boat is pulled into a dock by means of a winch 8 feet above the deck of the boat (see figure). The winch pulls in rope at a rate of 5 ...
*Sunday, March 27, 2016 by Sagar*

**Pre Calculus**

The revenue and cost equations for a product are R=x (50-0.002x) and C= 12x+ 150000. Where R and C are measured in dollars and x represents the number of units sold. How many units must be sold to get a profit of at least 1,650,000
*Saturday, March 26, 2016 by Destiney*

**Calculus**

A smokestack deposits soot on the ground with a concentration inversely proportional to the square of the distance from the stack. With two smokestacks d miles apart, the concentration of the combined deposits on the line joining them, at a distance x from one stack, is given ...
*Saturday, March 26, 2016 by Leanna*

**Calculus **

Suppose you are in a room that is a*10 meters. You can walk normally along the "a" meter long wall at "s" meters per second and crab walk in any direction at 1 meter per second. You start at one corner of the room, walk normally along the wall of length &...
*Friday, March 25, 2016 by Sarah*

**Calculus**

Suppose x; y, and z are positive numbers that sum to 10. What is the largest possible value of xy + xz + yz? (a) First, suppose that z is a fixed parameter. Then we have to find nonnegative numbers x and y (depending on the fixed value z such that x+y = 10-z), such ...
*Friday, March 25, 2016 by Sarah*

**Calculus Applied Integrals**

A cylindrical tank of 22.1m high with radius 12.2m is filled to 10m high with water. How much work must be done to pump all the water out of the tank? (density of water is 1000\ kg/m^3) I used similar triangles somewhere in my calculations to find the answer, but I'm not ...
*Thursday, March 24, 2016 by Isabella*

**Calculus**

A fence must be built in a large field to enclose a rectangular area of 25,600m^2. One side of the area is bounded by n existing fence, so no fence is needed for that side. Materials for the fence cost $3 per meter for the two ends and $1.50 per meter for the side opposite of ...
*Thursday, March 24, 2016 by Dante*

**Calculus**

a rancher has 1200 fet of fencing to enclose two adjacent cattle pens. What dimensions should be used so that the enclosed area is maximized?
*Wednesday, March 23, 2016 by Dante*

**calculus**

an air balloon is 80ft away from you with the angle of elevation of the rising balloon changing at a rate of 4 degrees per second how fast is the balloon rising when it is 6 feet off the ground.
*Wednesday, March 23, 2016 by marcos*

**AP Calculus AB**

Set up, but do not evaluate, the integral which gives the volume when the region bounded by the curves y = Ln(x), y = 1, and x = 1 is revolved around the line y = -1. I dont understand the washer thickness topic which is why im having trouble with this question
*Wednesday, March 23, 2016 by Vikram*

**AP Calculus AB**

An object has a constant acceleration of 40 ft/sec2, an initial velocity of -20 ft/sec, and an initial position of 10 ft
*Wednesday, March 23, 2016 by Vikram*

**Calculus**

An airplane is flying above an observer standing on the ground. At the moment it passes overhead, the observer judges by its apparent size that the airplane’s altitude is 30,000 feet. It takes 50 seconds for the plane, moving in a straight, horizontal line, to move ...
*Wednesday, March 23, 2016 by Anonymous*

**Calculus**

A 15.5 foot ladder leaning up against the building .the base is 8.2 feet away from the building .how far up does the ladder reach against the building.
*Monday, March 21, 2016 by Vickie*

**Calculus**

1) A telephone company has 10,000 phones in a certain city where the basic rate is $4 per month. The officials have evidence that if the charge is reduced the number of phones will increase at an estimated rate of 1,000 phones for each 25 cent reduction. What rate would yield ...
*Monday, March 21, 2016 by Omar*

**calculus **

the vector function r(t)=< 5 sin t, 3 sec t > , represents the position of a particle at time t. find the velocity v (t) and acceleration a (t). I don't know how to solve it without the t given. Please help
*Monday, March 21, 2016 by Danny*

**calculus**

Find the solution of the differential equation that satisfies the given initial condition. dp/dt=2 sqrt(pt), P(1)=5 my answer: P=(2/3t^(3/2)+(15sqrt(5)-10)/15)^2 how is it wrong?
*Sunday, March 20, 2016 by kyle*

**Math**

For a calculus quiz, the teacher will choose 11 questions from the 15 in a set of review exercises. How many different sets of questions could the teacher choose
*Sunday, March 20, 2016 by Rose*

**Calculus**

Gravel is being dumped from a conveyor belt at a rate of 15 ft^3/hr and its coarseness is such that is forms a pile in the shape of an inverted right cone whose height is three times its base radius. How fast is the height of the pile increasing when the pile has a height of ...
*Saturday, March 19, 2016 by Izzy*

**Calculus**

Gravel is being dumped from a conveyor belt at a rate of 15 ft^3/hr and its courseness is such that is forms a pile in the shape of an inverted right cone whose height is three times its base radius. How fast is the height of the pile increasing when the pile has a height of ...
*Saturday, March 19, 2016 by Sam*

**Calculus**

Rectangular sheet of metal 750mm by 300mm - find length of the sides of the squares to give max volume to the box, and find maximum volume of the box?
*Saturday, March 19, 2016 by Danny*

**integral calculus**

find the volume of the solid generated by revolving the area by the given curves about the indicated axis of revolution y^2=4ax,x=a;about the y-axis.
*Friday, March 18, 2016 by Anonymous*

**integral calculus**

find the volume of the solid generated by revolving the area by the given curves about the indicated axis of revolution y^2=4ax,x=a;about the y-axis
*Friday, March 18, 2016 by Anonymous*

**Calculus (Line Integral)**

Let c be a curve w/parameterization r(t). show that the line integral of T dr equals the length of the curve where T is the unit tangent.
*Friday, March 18, 2016 by Marie*

**AP Calculus AB**

2. For an object whose velocity in ft/sec is given by v(t) = -t^2 + 6, what is its displacement, in feet, on the interval t = 0 to t = 3 secs? 3. Find the velocity, v(t), for an object moving along the x-axis if the acceleration, a(t), is a(t) = cos(t) - sin(t) and v(0) = 3. v...
*Friday, March 18, 2016 by Vikram*

**Calculus**

A rectangle is inscribed in the interior section cut from the parabola x = 1/4 y2 by the line x=3. One side of the rectangle lies on the line. Fine the maximum area of such a rectangle.
*Thursday, March 17, 2016 by J*

**Calculus Related Rates**

Two sides of a triangle are 5 and 8 and the angle between them is increasing at .05 rad/sec. how fast is the distance between the tips of the sides increasing when the angle is pi/4
*Thursday, March 17, 2016 by Sam*

**Calculus Related Rates**

A balloon is 70 feet from an observer which is rising at 15 ft/sec. At 5 seconds after lift off, how fast is the angle of elevation changing?
*Thursday, March 17, 2016 by Sam*

**Calculus Related Rates**

If a spherical balloon is inflated and its volume is increasing at a rate of 6 in^3/min. What is the rate of change of the radius when the radius is 3 inches??
*Thursday, March 17, 2016 by Hailey*

**Integral calculus**

find the work required to pull up the anchor if the cable weighs 20 lb/ft in water
*Wednesday, March 16, 2016 by Anonymous*

**Integral calculus**

find the work required to pull up the anchor if the cable weighs 20 lb/ft in water
*Wednesday, March 16, 2016 by Anonymous*

**calculus!!!! help**

integrate:cosx+2/cosx+sinx
*Wednesday, March 16, 2016 by daniel*

**calculus help!!!!! plz**

integrate:cosx+2/cosx+sinx?????
*Wednesday, March 16, 2016 by daniel*

**Calculus**

(b) Find a solution of the initial-value problem. (Hint: First verify that all members of the family y = 4/x + C are solutions of the given equation.) y' = −1/4y^2 y(0) = 0.25
*Wednesday, March 16, 2016 by Kaitlyn*

**Calculus**

Estimate the area under the curve f(x) = x2 + 1 from x = 0 to x = 6 by using three circumscribed (over the curve) rectangles. Answer to the nearest integer.
*Tuesday, March 15, 2016 by Shane*

**Calculus**

If the area under the curve of f(x) = x2 + 2 from x = 1 to x = 6 is estimated using five approximating rectangles and right endpoints, will the estimate be an underestimate or overestimate? Underestimate Overestimate The area will be exact The area cannot be estimated with ...
*Tuesday, March 15, 2016 by Lilly*

**Calculus**

Two cruise ships leave the same point outside St. John’s harbor at noon. Ship A travels west at 20 km/hr, while Ship B travels south at 25 km/hr. Using calculus, determine how fast they are separating from each other at 2:00 p.m.
*Tuesday, March 15, 2016 by Ashley*

**Calculus**

Suppose the integral from 2 to 8 of g of x, dx equals 5, and the integral from 6 to 8 of g of x, dx equals negative 3, find the value of the integral from 2 to 6 of 2 times g of x, dx . 8 MY ANSWER 12 16 4
*Tuesday, March 15, 2016 by Lilly*

**Calculus**

Which of the following integrals cannot be evaluated using a simple substitution? the integral of 1 divided by the quantity x squared plus 1, dx the integral of 1 divided by the quantity x squared plus 1, dx the integral of x divided by the quantity x squared plus 1, dx (MY ...
*Tuesday, March 15, 2016 by Tiff*

**Calculus**

If f(x) and g(x) are continuous on [a, b], which one of the following statements is true? ~the integral from a to b of the difference of f of x and g of x, dx equals the integral from a to b of f of x, dx minus the integral from a to b of g of x dx ~the integral from a to a of...
*Tuesday, March 15, 2016 by Tiff*

**Calculus**

Given that the antiderivative of f(x) = e4x is F(x) = 1/4e^4x+C, evaluate the integral from 0 to 2 of e^4x, dx. e^8 1/4(1-e^8) 1/4(e^8-1) 1/4e^8 (MY ANNSWER)
*Tuesday, March 15, 2016 by Jess*

**Calculus**

Determine the interval on which f(x) = ln(x) is integrable. (0, ‡) [0, ‡) (−‡, 0) U (0, ‡)(MY ANSWER) All reals
*Tuesday, March 15, 2016 by Jess*

**Calculus**

For what values of a and b is (2, 2.5) is an inflection point of the curve x^2 y + ax + by = 0 ? What additional inflection points does the curve have?
*Tuesday, March 15, 2016 by Methendis*

**Calculus**

Use Euler's method with step size 0.2 to estimate y(1), where y(x) is the solution of the initial-value problem given below. (Round your answer to four decimal places.) y' = 1 − xy y(0) = 0 I don't even know how to start!
*Tuesday, March 15, 2016 by Kaitlyn*

**calculus**

Find the radius of the base and altitude of a right circular cone of maximum volume that could be inscribed in a sphere at radius 10 meters.
*Monday, March 14, 2016 by Cheska*

**calculus**

water is pouring into a conical cistern at the rate of 8 m^3/minute. If the height of the inverted cone is 12 meters and the radius of its circular opening is 6 meters, how fast is the water level rising when the water is 4 meters depth?
*Monday, March 14, 2016 by Anonymous*

**calculus**

The surface area of a sphere initially zero increases uniformly at the rate of 26 cm^2/seconds. Find the rate at which the radius is increasing at the end of 2 seconds.
*Monday, March 14, 2016 by Anonymous*

**Calculus**

Use the integral identity: ∫(a-1) (1/(1+x^2))dx=∫(1-1/a) (1/(1+u^2))du for a>1 to show that: arctan(a)+arctan(1/a)=π/2
*Monday, March 14, 2016 by Andre*

**Calculus Related Rates**

Two people leave from the same spot and walk at 4 ft/sec going north and 5 ft/sec northwest. At 30 seconds, how fast is the distance between them changing??
*Monday, March 14, 2016 by Hailey*

**Calculus Related Rates**

A balloon, 50 feet from an observer, is rising at 20 ft/sec. At 5 seconds after lift off 1. How fast is the distance between the observer and the balloon changing? 2. How fast is the angle of elevation changing? I need help on both questions. Thanks in advance smart people!!
*Monday, March 14, 2016 by Sally*

**Calculus**

Starting with an initial guess of x=2, use Newton’s method to approximate (Third root of 7). Stop the iterations when your approximations converge to four decimal places of accuracy. Compare with the approximation provided by your calculator I'm so stuck
*Sunday, March 13, 2016 by Tia*

**Calculus**

Using a linear approximation or differentials, approximate:(26.98)^(3/4) thank you for your help!
*Sunday, March 13, 2016 by Emma*

**calculus**

area between the curves y^2=4x , 7y=2x+20 , 2x+3y=0
*Sunday, March 13, 2016 by angelo*

**Calculus**

Find the equation of the line tangent to the curve y=(x^2+3)^1/2 that is perpendicular to the line 2x-y+7=0
*Saturday, March 12, 2016 by Courtney*

**calculus**

The region bounded by y=x^2 and y=4 is rotated about the line y=-1. Find the volume.
*Saturday, March 12, 2016 by dee*

**Calculus**

The temperature of a pan of hot water varies according to Newton's Law of Cooling: dT/dt=-k(T-A), where T is the water temperature, A is the room temperature, and k is a positive constant. If the water cools from 90°C to 85°C in 1 minute at a room temperature of 30...
*Saturday, March 12, 2016 by Una Rosa*

**Calculus**

Find the specific solution of the differential equation dy/dx = 4y/x^2 with condition y(−4) = e. y= -1 - 4/x <- my answer y=-1*e^(1/x) y=e^(-4/x) None of these
*Saturday, March 12, 2016 by Una Rosa*

**Calculus**

Hi it's me again I need help with this too and I promise to never use this site again! I feel so ashamed for asking :( Use the Fundamental Theorem to evaluate the integral from 0 to 3 of the quantity x cubed minus 6 times x, dx.The answer has to have the antiderivative too...
*Friday, March 11, 2016 by Adrianna*

**Calculus**

Can someone help and express the given integral as the limit of a Riemann sum but do not evaluate: the integral from 0 to 3 of the quantity x cubed minus 6 times x, dx.
*Friday, March 11, 2016 by Sammy N.*

**Calculus**

Evaluate the Riemann sum for (x) = x3 − 6x, for 0 ≤ x ≤ 3 with six subintervals, taking the sample points, xi, to be the right endpoint of each interval and please explain, using a graph of f(x), what the Riemann sum represents. My cousin needs help with her ...
*Friday, March 11, 2016 by Adrianna*

**Calculus**

Which of the following is the general solution of the differential equation dy/dx = 2x/y? y2 = x2 + C y2 = 2x2 + C <- my answer y2 = 4x2 + C x2 − y2 = C
*Friday, March 11, 2016 by nan*

**Calculus**

The slope of the tangent line to a curve at any point (x, y) on the curve is x/y. What is the equation of the curve if (4, 1) is a point on the curve? x2 − y2 = 15 x2 + y2 = 15 x + y = 15 <- my answer xy = 15
*Friday, March 11, 2016 by nan*

**Calculus**

The temperature of a pan of hot water varies according to Newton's Law of Cooling: dT/dt=-k(T-A), where T is the water temperature, A is the room temperature, and k is a positive constant. If the water cools from 90°C to 85°C in 1 minute at a room temperature of 30...
*Friday, March 11, 2016 by nan*

**Calculus**

Find the specific solution of the differential equation dy/dx = 4y/x^2 with condition y(−4) = e. y equals negative 1 minus 4 divided by x <- my answer y equals negative 1 times e raised to the 1 over x power y equals e raised to the negative 4 over x power None of these
*Friday, March 11, 2016 by nan*

**calculus**

Find the point on the line –3x+4y–5=0 which is closest to the point (0–5)
*Thursday, March 10, 2016 by Taylor*

**Calculus**

The particular solution of the differential equation dy/dt=2*y for which y(0) = 60 is y = 60e2t y = 60 e0.5t y = 59 + et y = 30et
*Thursday, March 10, 2016 by nan*

**Calculus**

The slope of the tangent line to a curve at any point (x, y) on the curve is x/y. What is the equation of the curve if (4, 1) is a point on the curve? x2 − y2 = 15 x2 + y2 = 15 x + y = 15 xy = 15
*Thursday, March 10, 2016 by nan*

**Calculus**

The temperature of a pan of hot water varies according to Newton's Law of Cooling: dT/dt=-k(T-A), where T is the water temperature, A is the room temperature, and k is a positive constant. If the water cools from 90°C to 85°C in 1 minute at a room temperature of 30...
*Thursday, March 10, 2016 by nan*

**Calculus**

Find the specific solution of the differential equation dy/dx = 4y/x^2 with condition y(−4) = e. y equals negative 1 minus 4 divided by x y equals negative 1 times e raised to the 1 over x power y equals e raised to the negative 4 over x power None of these
*Thursday, March 10, 2016 by nan*

**Calculus**

Express the given integral as the limit of a Riemann sum but do not evaluate: the integral from 0 to 3 of the quantity x cubed minus 6 times x, dx.
*Thursday, March 10, 2016 by nan*

**Calculus**

Use the Fundamental Theorem to evaluate the integral from 0 to 3 of the quantity x cubed minus 6 times x, dx. (Your answer must include the antiderivative.) Use a graph of the function to explain the geometric meaning of the value of the integral.
*Thursday, March 10, 2016 by nan*

**Calculus**

Evaluate the Riemann sum for (x) = x3 − 6x, for 0 ≤ x ≤ 3 with six subintervals, taking the sample points, xi, to be the right endpoint of each interval. Give three decimal places in your answer and explain, using a graph of f(x), what the Riemann sum in ...
*Thursday, March 10, 2016 by nan*

**Calculus**

Evaluate the Riemann sum for (x) = x3 − 6x, for 0 ≤ x ≤ 3 with six subintervals, taking the sample points, xi, to be the right endpoint of each interval. Give three decimal places in your answer.
*Thursday, March 10, 2016 by nan*

**calculus**

water is being siphoned from a cylindrical tank of radius 10m into a rectangular tank whose base measures 20m by 15m. if the depth of the water in the cylindrical tank in decreasing at a rate of 2m/s, at what rate is the depth of the water increasing in the rectangular tank
*Thursday, March 10, 2016 by Emily*

**Calculus**

Find equation of two tangent lines to curve y=x^2 that intersect @ (2,-2). Need exact values.
*Tuesday, March 8, 2016 by Jake*

**Calculus - Rates of Change**

A water tank has a shape of an inverted cone with a base radius of 2m and a height of 4 m. If water is being pumped into the tank at a rate of 2m3/min, then find the rate at which the water level is rising when the water is 3m deep. Attempted solution: V= 1/3πr^2h V= 1/3...
*Monday, March 7, 2016 by Melissa*

**Calculus**

How to do this vertical slicing question: find the area under the curve for the function y=(2x+1)^2 of the interval -1<=x<=3. I am not sure how to do this, but it may involve breaking the integral up. How though?
*Monday, March 7, 2016 by Cindy*

**Calculus with Analytical Geometry 1**

Jack Brown received two offers for his property: 1. 130000 in 5 months. 2. $13500 every months for the next 10 months. Find the present value of the two offers if theory is worth 12% compounded monthly.
*Monday, March 7, 2016 by Keon*

**AP Calculus AB**

Find the volume of the solid formed by revolving the region bounded by the graphs of y = x^2, x = 4, and y = 1 about the y-axis 39pi/2 225pi/2 735pi/2 None of these I got 39pi/2
*Monday, March 7, 2016 by Vikram*

**Calculus**

The City Electric System(CES) recently constructed a major transmission line along parts of South Street in the city. The transmission lines are strung between power poles and the hanging lines form a catenary curve. For this Problem we will use the following equation y=(T/w)...
*Monday, March 7, 2016 by Jay*

**Calculus: Implicit Derivatives**

Compute d/dx[f(g(x))] -where f(x)=x^4-x^2 -and g(x)=x^2-7 (Note: I tried 5 times but I still got this wrong. Plz help)
*Monday, March 7, 2016 by Dominick*

**Calculus / Rates of Change**

A jet flying due north at 16km/min passes 2 km directly above a plan flying due east at 8km/min. How quickly are they separating when the plane is 32 km from the crossover? What I have done (I am not sure if it is correct.): r^2=x^2+y^2+z^2 Since the plane has gone 32 meters, ...
*Sunday, March 6, 2016 by Jermaine*

**Calculus / Rates of Change**

A cylindrical tank with a circular base of 8m in diamante is being filled at 4m3/min. How fast is the level rising when it is half full? Known: d=8m 2r=d r=d/2 d(v)/dt=4.0m3/min Confusion: How to apply the "half full" concept.
*Sunday, March 6, 2016 by Jermaine*

**Calculus / Rates of Change**

An isosceles triangle has a base that is 1.5 times the height. If the area is increasing at 9cm2/s, how fast is the height increasing when it is 12 cm high? Known: base=1.5H dA/dt=9.0cm2/s h=12cm dh/dt= ? Area for a triangle: LxW/2 After that, I am confused.
*Sunday, March 6, 2016 by Jermaine*

**Calculus, Really need help!**

Compute d/dx(f(g(x))) -where f(x)= square root of x -and g(x)=x^2+7
*Sunday, March 6, 2016 by Dominick*

**Calculus**

Starting at midnight, a 10 foot radius circular pond freezes inward from the outer edge at a rate of 4 inches per hour. How fast is the open area shrinking at when the radius is 9 feet? (Note: if I'd said "at 3am" instead of "when radius is 9 ft", this ...
*Sunday, March 6, 2016 by Lela Mitevska*

**Calculus Derivatives**

Determine the concavity of f(x)=xlnx I end up with F''(x)=1/x, where it would be concave up when x>0 and concave down when x<0 Is this correct?
*Saturday, March 5, 2016 by Isabella*

**Calculus**

Integrate dx/(sqrt(x^2+16)). I have no idea how to start and which method to use. Thinking some sort of trig substitution? But it doesn't look like it. Step by step? Answer key says ln|x+ sqrt(x^2+16)|.
*Saturday, March 5, 2016 by Cindy*

**calculus**

a) Let f(z) = z^2 and γ(t) = 1 + it^3, t ∈ [0,1]. i) Write out the contour integral ∫γ f(z)dz as an integral with respect to t. You do not need to evaluate this integral. ii) Evaluate the integral ∫0,1+i z^2dz iii) What is the relationship between ...
*Saturday, March 5, 2016 by jack*

**Calculus**

Compute, in terms of A, B, h, and k, the area enclosed by the curve defined by parametric equations. x(θ)=Acosθ+h and y(θ)=Bsinθ+k. 0≤θ≤2π.?
*Friday, March 4, 2016 by Collin Richards*

**Calculus with Analytical Geometry **

1. A bullet is shot upwards with an initial velocity of 1000 ft/sec from a point 20 ft above groand its height above the ground at time t is given by h(t)=-16t^2 + 1000t + 20. How high will the bullet go and how long will it take the bullet to reach the highest point? 2. A ...
*Friday, March 4, 2016 by Sherianna*

**Calculus**

Show that f(x) = 2000x^4 and g(x) = 200x^4 grow at the same rate I know that they grow at the same rate because they are both raised to the same power, but i don't know how to show it.
*Friday, March 4, 2016 by Henry*

**Pre calculus**

Your computer supply store sells two types of laser printers. The first type, A, has a cost of $86 and you make a $45 profit on each one. The second type, B, has a cost of $130 and you make a $35 profit on each one. You expect to sell at least 100 laser printers this month and...
*Friday, March 4, 2016 by Maddie*

**Calculus**

Find the range of the function ∫sqrt(4-t^2) dt where a=0 =x [0, 4π] [0, 2π] [-4, 0] [0, 4]
*Friday, March 4, 2016 by Henry*

**calculus**

a) Obtain all solutions of the equation z^3 +1 = 0 b) Let z = x + iy. Obtain the real and imaginary parts of the function f(z) = 1/1+z c) Let f(x + iy) = x^2 - y^2 + iv( x,y). Determine a function v such that f is differentiable in the whole complex plane. Express f as a ...
*Thursday, March 3, 2016 by jack*

**Calculus Related Rates**

Two people leave from the same spot and walk at 4ft/sec going north and 5ft/sec going northwest. At 30 seconds, how fast is the distance between them changing?
*Thursday, March 3, 2016 by Sally*

**Calculus**

Find the y-intercept of the tangent line to y= -0.2/sqrt(6+5x) at(2.5,-0.04990597277) Thanks
*Thursday, March 3, 2016 by Niki*