Friday

August 1, 2014

August 1, 2014

Number of results: 125,545

**Solving for distance**

what distance did a car travel if the speed was 75mph and was on the road for 9 Hours? I need to know how I can figure out this question usin g my calculator step by step distance= speed * time.
*May 18, 2007 by Brooke*

**Physics**

What is the equation for average velocity given x1 (initial distance), x2 (final distance), t1 (initial time) and t2 (final time)?
*October 21, 2010 by Anna*

**Speed'Distance'Time**

Find out the distance covered when, speed is 960 km/hour and time is 1 hour 50 minutes.
*March 19, 2013 by Michelle*

**math**

Fred begins walking toward John house at 3 mi/h. John leaves his house at the same time and walks toward Fred's house on the same path at a rate of 2 mi/h. How long will it be before they meet if the distance between the houses is 4 miles? First, I set up an equation, 3h+2h=4...
*October 23, 2007 by robert*

**Mathematics**

A man walked for some distance at 8 km/h, and for an equal distance at 5 km/h. The total time he took was 13/4 hours. Find the total distance he walked. Explain your workings
*November 5, 2011 by Ruby*

**math 117**

A passenger train can travel 325 mi in the same time a freight train takes to travel 200 mi. If the speed of the passenger train is 25 mi/h faster than the speed of the freight train, find the speed of each. Speed = distance/time Therefore time = distance/speed. Assume the ...
*July 11, 2007 by Diana*

**physics-circular motion**

the turntable of a record player rotates at a rate of 11 1/3. A record with a radius of 15cm is being played. a punk kid throws a piece of gum that lands right on the edge of the record. What linear distance in meters does the gum travel if it stays on the record for 10 ...
*March 4, 2007 by kate*

**Economics/Math**

3. Assume you own a painting. If you sold it now, you could get £500 for it. However, the amount that people will be willing to pay in the future increases by £25 in odd years (including the first one) and by £26 in even years, for the next 53 years. If the interest rate stays...
*December 4, 2009 by Susan *

**math**

find the area of a right angled riangle. find the distance from A to B. Find the distance from B to C. Find the midpoint B(-1,4) A(-1,-1) C(4,-1) thanks for your time and help.
*June 12, 2013 by Anonymousab*

**Chemistry**

1. How is the rate affected by doubling the concentratino? 2. Explain the effect of concentration on the rate of a reaction in terms of the "Collision Theory" of chemical reactions. 3. Considering that 1/Time is proportional to the rate of the reaction how is the rate of the ...
*November 18, 2007 by Dick Rogers*

**chemmm helppppppppp**

Consider the following reaction: 2N2O(g)--->2N2(g) + O2(g) a. express the rate of the reaction with respect to each of the reactants and products. b.In the first 10.0 s of the reaction, .018 mol of O2 is produced in a reaction vessel with a volume of .250L. What is the ...
*February 1, 2009 by Natash*

**Math2**

The universal law of gravitation determines the amount of force exerted by a constant mass (M) on another constant mass (m), separated by a distance (r), is given by the expression F = ( -GmM )/r^2 a) What mathematical expression characterises the instant rate of change of the...
*October 18, 2011 by Raf*

**math**

on the average your heart beats about 72 time per minute. at this rate, about how many time will it beat in 30-day month and in a year and in your lifetime, if you live to 72 years of age?
*November 28, 2009 by mariyam*

**math**

can you please explain this question to me for part b i get t=0.7 by trial and error and 86 percent of the population but im sure theres a more exact way to do it (a) A chemical process produces NaCI at the rate 3t^1/2 grams per minute. (i) What is the rate of production 4 ...
*May 25, 2010 by jessie urgent please*

**Physics**

The distance between earth and the moon can be determined from the time it takes for a laser beam to travel from earth to a reflector on the moon and back. If the round-trip time can be measured to an accuracy of 0.19 of a nanosecond (1 ns = 10-9 s), what is the corresponding ...
*October 13, 2007 by Mary*

**Math**

A U.S. company sells products to a Dutch company and will receive payment of €550,000 in three months. At the time of sale, the spot rate of the euro was $1.25, and the 90-day forward rate was $1.21. At the time of sale, the U.S. company negotiated a forward contract with a ...
*October 23, 2007 by Kd*

**math**

A 16-ft ladder is sliding down a wall as shown in the figures below. The variable h is the height of the ladder's top at time t, and x is the distance from the wall to the ladder's bottom. Suppose that the top is sliding down the wall at a rate 5 ft/s. Calculate dx/dt when h...
*June 29, 2010 by Jacob*

**Physics**

A power boat of mass 475 kg is cruising at a constant speed of 8.9 m/s. The propeller provides a drive force of 770 N. The driver of the boat shuts off the engine, and the boat coasts to a halt. Assume -- contrary to fact -- that the resistive force due to the water is ...
*February 26, 2007 by Mary*

**math**

a car travelved a distance of 195 miles in 3 hours 15 minutes what is the unit rate
*April 19, 2014 by jane *

**chemistry**

You mix together in the proper manner the following VOLUMES: 0.0100 M Potassium iodide...9.2 mL 0.0010 M Sodium thiosulfate...6.5 mL Distilled water...16.8 mL 0.0400 M Potassium Bromate...13.9 mL 0.100 M Hydrochloric acid...6.1 mL Using the rate constant and rate equation ...
*March 2, 2013 by Cassie*

**physics please help??**

I know how to do this problem, but I am having a difficult time figuring out the distance . I thought that from wire 1 to P2 the distance is 45 cm, and the distance from wire 2 to the p2 the distance is 35 cm. However, I believe I am wrong, can someone please explain o me ...
*October 27, 2012 by henry*

**Physics please help!**

The distance between earth and the moon can be determined from the time it takes for a laser beam to travel from earth to a reflector on the moon and back. If the round-trip time can be measured to an accuracy of 0.19 of a nanosecond (1 ns = 10-9 s), what is the corresponding ...
*October 14, 2007 by Mary*

**chem**

H2o2+3i+2h -----> I3+2H2o In the first 10.0 second of the reaction the concentration of I dropped from 1.000M to 0.868M a) calculate the average rate of reaction for iodine in this time interval. b) Determine the rate of change in the concentration of H during this time ...
*October 15, 2013 by niki*

**physics**

a) Find the maximum rate of deceleration of a car on a dry, level road, assuming the coefficient of static friction between tires and pavement equals 1.4. (b) Find the minimum stopping distance if the car has an initial speed of 27.5 m/s. (c) Repeat parts (a) and (b) assuming ...
*February 8, 2011 by Anonymous*

**Algebra**

The tour de France is a bicycle race that begins in Ireland but is primarily a race through France. On each day, racers cover a certain distance depending on the steepness of the terrain. Suppose that one particulAr day the racers must comp,tee 210 mi. One cyclist traveling 10...
*April 18, 2011 by Anonymous*

**Physics**

(I'm only posting the questions I couldn't figure out, don't worry.) An object released from rest at time t=0 slides down a frictionless incline a distance of 1 meter during the first second. The distance traveled by the object during the time interval from t=1 second to t=2 ...
*January 17, 2008 by Hannah*

**College Physics**

In 1986, the distance of closest approach of Halley’s comet to the Sun is 0.57AU. (1 AU is the mean Earth-Sun distance = 150 million kilometers.) The comet’s speed at closest approach is 54.97 km/s. (a) – By 1989, Halley’s comet had traveled to a distance corresponding to the ...
*November 4, 2012 by johnathan*

**Calculus**

A woman at point A on the shore of a circular lake with radius 2.5mi wants to arrive at the point C diametrically opposite A on the other side of the lake in the shortest possible time. She can walk at a rate of 3.25 mi/hr and row at a rate of 2 mi/hr. Find shortest time.
*April 30, 2013 by Shannon*

**Chem**

Consider the following reaction: 6A + 2B 5C + 4D Determine the following rates at a time when the rate of consumption of B is 2.5E-05 M/s. a) rate of consumption of A M/s b) rate of formation of C M/s c) rate of formation of D M/s d) rate of reaction M/s
*November 14, 2011 by Rachel*

**Math**

A car is heading east toward an intersection at the rate of 40 mph. A truck is heading south, away from the same intersection at the rate of 60 mph. At what rate is the distance between the car and the truck changing when the car is 8 miles from the intersection and the truck ...
*July 31, 2011 by eve*

**Math**

A car is heading east toward an intersection at the rate of 40 mph. A truck is heading south, away from the same intersection at the rate of 60 mph. At what rate is the distance between the car and the truck changing when the car is 8 miles from the intersection and the truck ...
*July 31, 2011 by eve*

**Physics**

The distance between a loudspeaker and the left ear of a listener is 2.19 m. (a) Calculate the time required for sound to travel this distance taking the speed of sound to be 343 m/s. (b) Assuming that the sound frequency is 525 Hz, how many wavelengths of sound are contained ...
*March 3, 2013 by Tim*

**Physics**

A small mirror is attached to a vertical wall, and it hangs a distance of 1.81 m above the floor. The mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. The incident and reflected rays lie in a plane ...
*April 10, 2013 by Tim*

**Physics**

A small mirror is attached to a vertical wall, and it hangs a distance of 1.81 m above the floor. The mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. The incident and reflected rays lie in a plane ...
*April 10, 2013 by Jacoby*

**Physics**

A small mirror is attached to a vertical wall, and it hangs a distance of 1.81 m above the floor. The mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. The incident and reflected rays lie in a plane ...
*April 11, 2013 by Sue*

**SCIENCE**

IF A TORTOISE AND A HARE ARE RUNNING IN A RACE. AND IN MY GRAPH I HAVE DISTANCE IN THE VERTICAL SCALE AND TIME IN THE HORIZONTAL SCALE. THE TORTOISE IS RUNNING AT A CONSTANT RATE WITHOUT STOPPING. BUT THE HARE IS CONFIDENT AND HE STOPS HOPPING AND WAITS FOR THE TORTOISE TO ...
*July 18, 2010 by Anonymous*

**physics**

distance = velocity x time 36m/s x4 =144/2 = 72 d=vt 32 x 6 = 192 distance - 72M + 192M = 264M
*June 8, 2012 by fahd*

**Physics repost please clarify**

The distance between earth and the moon can be determined from the time it takes for a laser beam to travel from earth to a reflector on the moon and back. If the round-trip time can be measured to an accuracy of 0.19 of a nanosecond (1 ns = 10-9 s), what is the corresponding ...
*October 16, 2007 by Mary*

**Calculus**

Two cars start moving from the same point. One travels south at 60 mph and the other travels west at 25 mph. At what rate is the distance between the cars increasing 2 hours later? Let x = the distance covered by the south traveling car. Let y = the distance covered by the ...
*June 28, 2013 by Robin*

**Math**

Please help me.... Two cars are starting from positions that are 20 miles apart. They are both headed for the same intersection, as depicted in the diagram below. Car A is traveling at 30 mph, and Car B is traveling at 45 mph. Which car will reach the intersection first? 1. ...
*January 8, 2014 by Lizzie098*

**science and medicine**

I don't have any idea how to solve this. Could someone show me the steps in solving this word problem? I am at a loss! Abus leaves a station at 1 pm., traveling west at a rate of 44 mi/h. One hour later a second bus leaves the same station, traveling east at a rate of 48 mi/h....
*March 21, 2007 by andy*

**Math**

Jane walks one mile from her house to her grandparents’ house. Then she returns home, walking with her grandfather. Her return rate is 70% of her normal walking rate. Let r represent her normal walking rate. a. Write an expression for the amount of time Jane spends walking. b...
*May 5, 2014 by Anonymous*

**Math - Compound**

If a bank offers interest at a nominal rate of 6%, how much greater is the effective rate if interest is compounded continuously than if the compounding is quarterly? I don't get this question at all... All I'm given is the rate and how am I suppose to compare compounded ...
*January 24, 2009 by Anonymous*

**8th Grade Algebra1**

I don't understand this question, so if anyone can answer it, that would be great! We are doing motion problems, so as you probably know, the formula is d=rt. (distance equals rate times time.) We have to make a chart to answer the following question... A roller coaster goes ...
*November 7, 2008 by Nicole C.*

**physics**

An elevator of mass M rises a distance H in time T and acquires potential energy PE. If it rises the same distance in half the time the increase in potential energy will be?
*June 29, 2010 by Anonymous*

**algebra**

The distance the bicycle travels and the time taken are expressed by the formula d(t)=t^2-2t, there d(t) is in miles and t in hours. Find the time taken by the bicycle to cover a distance of 63 miles.
*November 29, 2011 by ls*

**Algebra**

The bus stations in Trawlwy and Fenton are 220 miles apart. A bus left Trawley for Fenton at 9:00am. Traveling at 40 miles per hour. One hour later, an express bus left Fenton for Trawley traveling along the same road at 50 miles per hour. At what time did the buses pass each ...
*May 4, 2012 by Miranda*

**Physics**

A car accelerates steadly from zero to 30m/s in a distance d & a time t, another car takes a time 3t to accelerate steadly from stationary to the same final velocity.what distance does the second car cover during the new the new acceleration?
*November 25, 2012 by Minte*

**math**

Water is leaking out of an inverted conical tank at a rate of 11400 cm^3/min at the same time that water is being pumped into the tank at a constant rate. The tank has height 8.0m and the the diameter at the top is 3.5m. If the water level is rising at a rate of 19.0cm/min ...
*March 25, 2008 by shelby*

**Math**

Over a fixed distance speed r varies inversely as time t. If the speed of a car is 30 mph when the time is 6 seconds what would the speed be of the car if the time was 4 seconds
*July 11, 2013 by Scott*

**Calculating Rate Constants**

I'm really stuck with this one. Here's the rate law and the data that is needed. I appreciate any help Rate= k[I2]X{[H+]Y[CH3COCH3]Z Column 1 - Trial Column 2 - Volume of 0.0010 M I2 Column 3 - Volume of 0.050 M HCl Column 4 - Volume of 1.0 M acetone Column 5 - Volume of ...
*February 13, 2013 by Amy*

**Physics**

Hi, i'm kinda lost with this one. a ball is thrown at 15m/s at an angle of 30 degrees to the horizontal , how far does it travel horizontally before making contact with the ground? THANKS IN ADVANCE! You'll need to determine how long the object is in the air first. Then the ...
*October 7, 2006 by Jackie*

**Math**

20. The time t required to drive a certain distance varies inversely with the speed, r. If it takes 2 hours to drive the distance at 67 miles per hour, how long will it take to drive the same distance at 55 miles per hour? a. about 1.64 hours b. about 134.00 hours c. about 2....
*May 23, 2014 by Anonymous*

**Calculus-particle motion**

1. A particle is moving on the x-axis (or any number line) Its position x(t), or distance from the origin, at the time t is given by x(t)=4t^3-16t^2+15t. t is greater than or equal to 0 a.) Where is the particle when it is at rest? b.) During what time interval is the particle...
*February 7, 2011 by Matt*

**algebra word problem**

A long distance runner starts at the beginning of a trail and runs at a rate of 5 miles per hour. One hour later, a cyclist starts at the beginning of the trail and travels at a rate of 13 miles per hour. What is the amount of time that the cyclist travels before overtaking ...
*February 27, 2014 by brandy*

**Physics**

Show that the average speed of a rabbit that runs a distance of 30 m in a time of 2 s is 15 m/s. I have a whole bunch of problems such as these and i'm not sure what math formula to use to figure problem.I know its Acceleration ! change of velocity time interval ! "v "t but ...
*October 10, 2012 by Katherine*

**Economic Question**

Sorry, this is a little long, hope somebody could give me some help. Thanks in advance. Consider the exchange rate of the dollar for the euro. Suppose that the liquidity function L(i) is the same in both the United States and Europe. The United states and Europe are initially ...
*June 21, 2008 by Leo*

**math URGENT PLEASE HELP**

can you please explain this question to me for part b i get t=0.7 by trial and error and 0.6 percent of the population but im sure theres a more exact way to do it (a) A chemical process produces NaCI at the rate 3.Jtgrams per minute. (i) What is the rate of production 4 ...
*May 25, 2010 by jessie*

**physics**

A .22 rifle bullet traveling at 360m/s strikes a block of wood, which penetrates to a depth of .110m. The mass of the bullet is 1.80g. Assume a constant retarding force.A) how much time is required for the bullet to stop? b) what force in newtons soes the wood exert on the ...
*November 16, 2006 by Chris*

**finance**

What is the relationship between an interest rate and a discount rate in time value of money calculations?
*November 16, 2010 by Anonymous*

**Production & Operations Mgmt in Business**

If someone could help me, I am truly desperate here. I am struggle with this problem. – Simple Linear Regression Applications Interpretation and Use of Computer Output (Results) (1) The management of an international hotel chain is in the process of evaluating the possible ...
*September 30, 2012 by Jack*

**Economics**

The economy consists of the following: - working-age population: 20M - full time employment: 8M - part-time employment: 2M (1M of whom wish they had full-time jobs) - unemployment: 1M If 0.6M of those unemployed are frictionally, structurally, and seasonally unemployed, what ...
*February 28, 2007 by Freddy*

**Math**

t noon, ship A is 30 nautical miles due west of ship B. Ship A is sailing west at 16 knots and ship B is sailing north at 22 knots. How fast (in knots) is the distance between the ships changing at 7 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.) Note: Draw ...
*October 15, 2009 by Salman*

**math rate**

15 chapters in 5 days - I already know the unit rate is 3 - I have to give the rate and unit rate. I don't know how to figure out the rate. Can someone please help me? rate is 15 chapters/5 days unit rate is 3 chapters/day
*March 4, 2007 by brandon*

**Math**

A particle moves in a straight line with velocity t^(-2)-(1/16) ft/s. Find the total displacement and total distance traveled over the time interval [2,5 ok i got the displacement is .1125 ft however i can not find the distance! help!
*November 18, 2007 by Anonymous*

**Statistics**

In a three-channel queuing system, the arrival rate is 1 unit per time period and the service rate is 0.6 unit per time period. Determaine the probability that an arriving unit does not have to wait.
*November 15, 2012 by Ellis*

**Physics **

A crate is initially at rest on a rough, horizontal floor. The crate moves in a straight line as it is pushed resulting in the crate speeding up at a constant rate of 3.89 m/s2. After a while, the crate is no longer being pushed and the crate slows down at a constant rate of 5...
*January 25, 2013 by Lyn*

**Logarithm**

The rate of auto thefts triples every 6 months. (a) Determine, to two decimal places, the base b for an exponential model y = Ab^t of the rate of auto thefts as a function of time in months. b = (b) Find the doubling time to the nearest tenth of a month. months
*September 3, 2013 by Sydney*

**Chemistry**

For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying concentrations are given below. run # [XO] [O2] rate, mol L-ls-l 1 0.010 0.010 2.5 2 0.010 0.020 5.0 3 0.030 0.020 45.0 The rate law is therefore a. rate = k[XO...
*February 20, 2012 by Hannah*

**Chemistry**

For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying concentrations are given below. run # [XO] [O2] rate, mol L-ls-l 1 0.010 0.010 2.5 2 0.010 0.020 5.0 3 0.030 0.020 45.0 The rate law is therefore a. rate = k[XO]...
*February 20, 2012 by Hannah*

**math**

If Mark invests $8000 at 6% simple interest rate, how much money must he invest at an 8% simple interest rate in order for the interest on each investment to be $500. Assume that the amount of time for both investments is the same.
*January 23, 2013 by devin*

**calculus**

A fixed amount 15000 is invested in a tax-sheltered account at an annual rate of percent, compounded continuously. Let represent the amount in the account at time . Part A. Let percent. Give the differential equation that describes the rate of change in the amount with respect...
*September 11, 2012 by mike*

**Math**

The nominal rate of interest is 8% and the rate of inflation is 5%. A single deposit is invested for 10 years. Let: A= value of the investment at the end of 10 years measured in "constant dollars," i.e. in dollars valued at time 0. B= value of the investment at the end of 10 ...
*May 11, 2011 by Katie*

**MATH**

what is a constant rate of change? That means the velocity changes over time in the same manner. 4,800 +3,700 =4,500 Rate of Change Is Constant You can increase or decrease the amount or concentration of a species by a constant value using a zero order rule. For example, the ...
*January 9, 2007 by Austin*

**Math**

In an experiment, a seabird was taken from its nest, flown a distance 5190 km away, and released. It found its way back to its nest a time 13.8 days after release. What was the bird's average velocity in m/s for the whole episode, from leaving the nest to returning? Would I ...
*June 30, 2011 by layla*

**Math**

The universal law of gravitation determines the amount of force exerted by a constant mass (M) on another constant mass (m), separated by a distance (r), is given by the expression F = ( -GmM )/r^2 a) What mathematical expression characterises the instant rate of change of the...
*October 15, 2011 by Raf*

**physics**

why is the total distance traveled by a mass traveling in a circle of radius R during n revolutions =2piRn. The average speed is the distance traveled divided by the elapsed time, so: v=2piRn/delta T, where delta T is the elapsed time.
*March 8, 2009 by natash*

**physics**

why is the total distance traveled by a mass traveling in a circle of radius R during n revolutions =2piRn. The average speed is the distance traveled divided by the elapsed time, so: v=2piRn/delta T, where delta T is the elapsed time.
*March 8, 2009 by natash*

**math**

Vanessa throws a tennis ball in the air. The function h(t)=-16t^2+45t+7 represents the distance, in feet, that the ball is form the grounf at any time t. At what time, to the nearest tenth of a second, is the ball at its maximum height?
*April 2, 2009 by Anonymous*

**chemistry**

The distance versus time plot for a particular object shows a quadratic relationship. Which column of distance data is possible for this situation?
*March 15, 2014 by ry*

**Physics**

Tim and Rick both can run at speed Vr and walk at speed , Vw with Vr > vw. They set off together on a journey of distance . Rick walks half of the distance and runs the other half. Tim walks half of the time and runs the other half. How long does it take Tim to cover the ...
*October 5, 2011 by Sara*

**calculus**

A plane flying horizontally at an altitude of 1 mi and a speed of 500 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 2 mi away from the station. I drew a diagram and figured out I need to ...
*March 4, 2012 by Daniel*

**Ap Chemistry**

I have no idea where to start with this problem: A certain reaction has the following general form: aA -> bB At a particular temperature and (A)o = 2.00(10^-2)M, concentration versus time data were collected for this reaction, and a plot of In(A) versus time resulted in a ...
*December 8, 2009 by Shawn*

**AP Chemistry**

I have no idea where to start with this problem: A certain reaction has the following general form: aA -> bB At a particular temperature and (A)o = 2.00(10^-2)M, concentration versus time data were collected for this reaction, and a plot of In(A) versus time resulted in a ...
*December 8, 2009 by Shawn*

**Pre Calc--- Repost**

I already asked this, but I didn't really understand the answer I got. I got the general idea, but I don't have a good enough understanding to answer the question. Writing to Learn: In a certain video game a cursor bounces back and forth horizontally across the screen at a ...
*March 20, 2011 by Taylor*

**Algebra **

The bus stations in Trawlwy and Fenton are 220 miles apart. A bus left Trawley for Fenton at 9:00am. Traveling at 40 miles per hour. One hour later, an express bus left Fenton for Trawley traveling along the same road at 50 miles per hour. At what time did the buses pass each...
*May 6, 2012 by Miranda*

**Physics - VERY IMPORTANT**

Describe an experiment that shows that the rate at which an object falls is not affected by any horizontal motion it may have. EXPLAIN CLEARLY PLEASE!! thank you Take a dart gun, shoot it horizontally, and at the same time, drop a dart. See which one gets to the floor first. ...
*December 6, 2006 by Marie*

**math**

Two radar stations at A and B, with B 6 km east of A, are tracking a ship which is generally to the north. At a certain instant, the ship is 5 km from A and this distance is increasing at the rate of 28 km/h. At the same instant, the ship is also 5 km from B, but this distance...
*July 15, 2013 by JEN*

**College Mathematics**

You drove 2695 miles in 35 hours. (1) What is your average rate of change? (2) Suppose you can drive that distance at a legal 75 mile per hour rate. How long should it take you to complete the trip? (3) Suppose you are driving that distance at an illegal 86.8 miles per hour ...
*September 7, 2010 by Melissa*

**calculus**

Q#1: From a point of O, two cars leave at the same time. One car travels west and after ‘t’ sec, its position is x=t2+t ft. the other car travels north and it covers y= t2+3t ft in ‘t’ sec. At what rate is the distance between the two cars changing after 5 sec? Question#2: ...
*October 19, 2010 by awesome*

**math**

1) initial investment = $600 annual % rate = ? time to double = ? amount after 10 years = $19,205.00 19,205 = 600e^(10r) I do not know how to solve for r of find the time to double.
*February 8, 2010 by Hannah*

**Science (physics)**

You watch a distant woman driving nails into her front porch at a regular rate of 1 stroke per second. You hear the sound of the blows exactly synchronized with the blows you see. And then you hear two more blows after you see her stop hammering. How far away is she? It takes ...
*March 1, 2007 by Courtney*

**math**

Please someone show me how to work this one out? Suppose Caroline is a cinephile and buys only movie tickets. Caroline deposits $3000 in a bank acct that pays an annual interest rate of 20%. You can assume that this interest rate is fixed-that is, it won’t change over time. At...
*February 26, 2012 by nan*

**Math; Alegbra for PSAT**

Jim can fill a pool carrying bucks of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together? The answer is 15 minutes. But how? Figure the rate each can fill the pool jim rate= 1/30 (...
*October 17, 2006 by Sean*

**Physics **

~I got a and b right but c i can't figure out Freight trains can produce only relatively small acceleration and decelerations. (a) What is the final velocity of a freight train that accelerates at a rate of 0.0600 m/s2 for 8.00 min, starting with an initial velocity of 5.00 m/...
*November 4, 2011 by Lindsey*

**Math**

Please review. Ella can drive 65 mi on side roads in the same time that it takes to drive 30 mi on the interstate. Ella's rate on the side roads is 7 mi faster than her rate on the interstate, what is her rate on the side roads? 65/x+7=30/x 35x=210 x=6 6+7=13
*November 30, 2007 by Brandon*

**college algebra**

Solve the problem. A man rode a bicycle for 12 miles and then hiked an additional 8 miles. The total time for the trip was 5 hours. If his rate when he was riding a bicycle was 10 miles per hour faster than his rate walking, what was each rate?
*February 25, 2009 by megan*

**(Please help) Math**

1) initial investment = $600 annual % rate = ? time to double = ? amount after 10 years = $19,205.00 19,205 = 600e^(10r) I do not know how to solve for r of find the time to double.
*February 9, 2010 by Hannah*

**math**

a spherical hailstone is losing mass by melting uniformly over its surface as it falls. At a certain time, its radius is 2 cm and its volume is decreasing at the rate of o.1 cm^3/s. How fast is the radius decreasing at the time?
*March 25, 2013 by Cathy*

**Math**

Please help!! We can determine the time it would take an object to fall (if there were no air resistance) by using the formula where d is the distance.t=1/4sq.root of d, d being the distance 1. We can determine the time it would take an object to fall (if there were no air ...
*September 13, 2010 by Ashley*

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