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 Question 383609: Hi Stuck on this, can someone please help The total surface area S of a closed cone of base radius r cm and perpendicular height h cm is given byS = pir^2 + pi r sqrt(r^2 + h^2). If r and h are each increasing at the rate of 0.25 cm s^-1, find the rate at which S is increasing at the instantwhen r = 3 and h = 4. Thank You, Click here to see answer by Fombitz(13828)

 Question 383682: If a, b and c in a quadratic equation are all integers, is the product of its solution always rational?(TEXT BOOK) Click here to see answer by Fombitz(13828)

 Question 383696: Hi Will someone help please. The d's are like curly d's not sure of the name or how to type? Given f(x,y) = (x - y)/(x + y), evaluate df/dx and df/dy at the point (1,2). Thanks in advance Click here to see answer by tinbar(128)

 Question 383758: Hi, Stuck here with this particular problem, please can somebody help The equation governing the buckling load P of a strut with one end fixed and the other end simply supported is given by tan (Mu)L = (Mu)L where (Mu) = Sqrt (P/EI), L the length of the strut and EI the flexural rigidity of the strut. By writing x = (Mu)L, solve the equation tan x = x using three iterations of the Newton-Raphson method, taking an initial approximation x0 = 4.5 Thanks very Much Click here to see answer by solver91311(16897)

 Question 383795: x squared - 5x - 14 = 0 Click here to see answer by Jk22(389)

 Question 383851: Originally, the dimensions of a rectangle were 18cm by 24cm. When both dimensions were decreased by the same amount, the area of the rectangle decreased by 117 sq. cm. Find the dimensions of the new rectangle. Click here to see answer by mananth(12270)

 Question 384079: implicit differeniation to find y' and evaluate y' at the indicated point . 1) xIn y + 2y= 2x^3 : (1,1) 2) x^3 - tx^2 - 4= 0 :(-3,-2) Click here to see answer by Fombitz(13828)

 Question 384275: the cost of renting a truck is \$39.99 for the first hour and \$19.99 for each additional hour.How long can can a person have the truck If the cost is to be less then \$ 120 Click here to see answer by rfer(12662)
 Question 384275: the cost of renting a truck is \$39.99 for the first hour and \$19.99 for each additional hour.How long can can a person have the truck If the cost is to be less then \$ 120 Click here to see answer by stanbon(57361)

 Question 384282: A rectangle that the length is twice the with with an area of 50yd^2 Click here to see answer by mananth(12270)

 Question 384248: The surface area of a rectangular box with a square base is 54 square inches, and is given by A = 2x2 + 4xh Find x when h = 3 inches. Click here to see answer by ankor@dixie-net.com(15656)

 Question 384235: A path followed by the diver can be modeled by h = -1/5(x2- 5x- 70) where h is the height (in feet) and x is the horizontal distance (in feet) from the edge of the pool.How far from the edge of the pool is the diver when he hits the water? Answer in units of ft. Click here to see answer by ankor@dixie-net.com(15656)

 Question 384343: long distance telephone cost 30 cent for 3 mins and 11 cents for each addiotional min.For how many mins can a person talk for less then 2.50 Click here to see answer by rfer(12662)

 Question 384388: Hi Can Someone please help Use the Newton-Raphson method to find a solution to four decimal places of the equation cos x = x over the interval [0,pi/2]. Start with an initial estimate of x0 = 0. Hint: Ensure x is measured in radians. Thank You Click here to see answer by stanbon(57361)

 Question 384467: Find the positive roots of the equation 4x squared +27x=40 by completing the square Click here to see answer by stanbon(57361)

 Question 384497: The algebraic relation d=0.0056s^2+0.14s models the relation between a vehicle's stopping distance d, in meters, and its speed s, in kilometers per hour. What is the fastest you could drive and still be able to stop within 80m? What is the stopping distance for a car travelling at 120km/h? Estimate the length of an average car. How many cars lengths does the stopping distance in (b) correspond to? Click here to see answer by nerdybill(6961)

 Question 384598: solve for x: 9(x + 4)^2 - 7 = 0 Click here to see answer by mananth(12270)

 Question 384599: solve for x: 5x^2 + 10x + 5 = 7 Click here to see answer by mananth(12270)

 Question 384489: A bus company has 4000 passengers daily, each paying a fee of 2\$. For each 0.15\$ increase, the company estimates that it will lose 40 passengers. If the company needs to take in \$10 450 per day to stay in business, what fare should be charged? Click here to see answer by ankor@dixie-net.com(15656)

 Question 384666: Given the quadratic function f(x)=x^2 - 6x + 9 find a value of x such that f(x)= 25 Click here to see answer by richard1234(5390)

 Question 384665: Joshua and Geraldine can finish cleaning the house in 2 hours. If it takes Joshua working alone 3 hours longer than it takes Geraldine working alone, how many hours will each need to finish the work alone? Click here to see answer by mananth(12270)
 Question 384665: Joshua and Geraldine can finish cleaning the house in 2 hours. If it takes Joshua working alone 3 hours longer than it takes Geraldine working alone, how many hours will each need to finish the work alone? Click here to see answer by edjones(7569)

 Question 384761: Solve for x: 8x^3 - 125 = 0 Click here to see answer by ewatrrr(10682)

 Question 384795: A ball is thrown straight up into the air. The approximate height h of the ball after t seconds can be appromimately modeled by the function h=-16t^2+55t.What is the maximum height that the ball reaches? Click here to see answer by stanbon(57361)

 Question 384820: factor 28x^2-23x-15 into factors with integer coefficients, if posible. Click here to see answer by scott8148(6628)

 Question 384812: for the equation 25x^2 - kx = -4, find k so that the equation has exactly one rational root. Click here to see answer by scott8148(6628)

 Question 384886: Hi Please help. Partial differentiate the following, the d's are the 'curly' d's but couldnt get them on here Find df/dx, df/dy, d^2f=dx^2 and d^2f/dy^2 for f(x, y) = e^(x+y).sin(x - y). Thank You Click here to see answer by richard1234(5390)

 Question 385173: Getting lost in completing the square for 2x^2+5x+11=0 I am able to get to 2x^2+5x=-11 then do I divide everything by 2? That would give me a really complicated fraction of x^2+5x/2=-11/2 then I am lost... Melody Click here to see answer by stanbon(57361)

 Question 385197: A central angle intercepts an arc of a circle equal in length to a diameter of the circle, find the measure of the central triangle in radians. Click here to see answer by Edwin McCravy(8909)

 Question 385186: I am very confused on this problem The Danville Express travels 280 miles at a certain speed. If the speed had been increased by 5mph the trip could have been made in 1 hour less time find actual speed Click here to see answer by scott8148(6628)