In 1920 the record for a certain race was 46.5 seconds. in 1980 it was 45.3 seconds let R(t) = the record in the race and t=the number of years since 1920 R(t) = 46.5  t*0.02 what is the
12,336 results
algebra
In 1960, the world record for the men's mile was 3.91 minutes. In 1980, the record time was 3.81 minutes. a. Write a linear model that represents the world record (in minutes) for the men's mile as a function of the number of years, t, since 1960. y= () b.

science
a runner training for a race times her 400 meter laps around a track. her times are lap 1 60 seconds, lap 2 57 seconds, lap 3 55 seconds and lap 4 53 seconds. what is her avaerage velocity in meters per second (m/s)?

physics
in a 100m race, 2 sprinters finish at the same time of 10.2 seconds, accelerating uniformly, sprinter A took 2 seconds to obtain max speed, sprinter B took 3 seconds, they ran their max speed for the remainder of the race, what is the acceleration of each

Math
The record for the Boston Marathon's wheelchair division is one hour 18 minutes and 27 seconds A) The Boston Marathon is 26.2 miles long what was the average speed of the record winner of the wheelchair division round to the nearest hundredth B) at this

Physics
1. A rabbit and a turtle are practicing for their big race. The rabbit covers a 30.0 m practice course in 5.00 seconds; the turtle covers the same distance in 120 seconds. If the actual race is run on a 96.0 m course, by how many seconds will the rabbit

math
In a motorcycle race, one lap of the course is 650 m. At the start of the race, John sets off 4 seconds after Tom does, but John drives his motorcycle 5m/s faster and finishes the lap 2.5 seconds sooner than Tom does. What is the speed at which each of

physics
In 1989, Carl Lewis established a world record when he ran the 100. meter dash in 9.92 seconds. What was his average speed (in m/s) for the race? Remember to include your data, equation, and work when solving this problem

Physics
In the qualifying round of the 50yd freestyle in the sectional swimming championship, Dugan got an early lead by finishing the first 25.00 yd in 10.01 seconds. Dugan finished the return leg (25.00 yd distance) in 10.22 seconds. a. Determine Dugan's

computer c++
write a program that produce a bar chart showing the population growth of Prairieville, a small town in the Midwest, at 20 year intervals during the past 100 years. the program should read in the population figures (rounded to the nearest 1000 people) for

physics
a bug is sitting on a long playing record going at a constant speed. Given: The record is turnning at a constatn reate of 33.3 revloutions per minute. The bug, whose mass is 1.4g, is sitting 12cm from the center of the record. Find; a. how long does it

algebra
In 1920 the record for a certain race was 46.5 seconds. in 1980 it was 45.3 seconds let R(t) = the record in the race and t=the number of years since 1920 R(t) = 46.5  t*0.02 what is the predicted record in 2003? 44.84 what is the predicted record in

Physics
On August 20, 1989, in Cologne, West Germany, Said Aouita of Morocco also established a world record when he ran the 3000 meter run in 7.00 minutes 29.45 seconds. What was his average speed (in m/s) for the race? Do I divide 3000 by 7 minutes and 29.45

physics
The current indoor world record time in the 200m race is 19.92 s, held by Frank Fredericks of Namibia (1996), while the indoor record time in the onemile race is 228.5 s, held by Hicham El Guerrouj of Morroco (1997). (a) Find the mean speed in meters per

gallegos
"Robert can swim the first 50 meters of a race in 1 minute. Then he slows down by 12 seconds for each of the next 50 meters of a race. How long will it take Robert to swim a 400meter race?

ENGLISH
In which sentence is race used as a noun? A. Tom will race with four other boys. B. Tom won the race. C. If you race across town, you'll be on time. D. Don't race the motor when you're starting the car ITS C RIGHT?

physics
A race car completes the final lap of a race on a 2kilometer circular track. At the start of the lap, it crosses the line at 60 meters/second. It completes the lap 28.57 seconds later, crossing the line at 85 meters/second. Calculate the displacement and

Physics
In 1989, Carl Lewis established a world record when he ran the 100 meter dash in 9.92 seconds. What was his average speed(in m/s) for the race? Remember to include your data, equation, and work when solving this problem. I am not sure how to do this

physics
Olympic champion Justin gaitlin set a new world record for 100.0 m sprint at the last lympics by clocking 9.86 s for the race.Calculate a)His average speed for the race b)Assuming that he accelerated uniformly for the first 4.86 s after taking off the

ELA and Please Hurry!!!!
Not only is the race special because it takes place on a special day, but it also has a rich, over threedecade tradition. While the Boston Marathon can declare it is the oldest road race in America, few 10K’s can claim they’ve been around longer than

Physics
During a lawnmower race, a rider starts from rest and accelerates at 1 m/s/s for 10 seconds. The rider then maintains a constant velocity for the remainder of the race, which takes an additional 20 seconds. A) How far was the race? B) What was the

physics
a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds

Physics
A sprinter starts from rest in a 100meter race, accelerates to his full running speed of 10.3 m/s in 1.15 seconds (assume constant acceleration) and continues at that speed for the rest of the race. (a) How far did he run before attaining his full speed?

Math
how do I solve this problem. In 1920 the record for a certain race was 445.7 sec. In 1970, it was 44.2 sec. Let R(t) = the record in the race and t = the number of years since 1920. a) Find a linear function that fits the data R(t) = b) What is the

Math
In 1920, the record for a certain race was 46.6 sec. In 1980, it was 45.4 sec. Let R(t)= the record in the race and t = the number of years snce 1920. a) Find a linear function that fits the data R(t) = b) Use the function in (a) to predict the record in

math
In 1920 the record for a certain race was 46.6 sec. In 1950 it was 46.0 sec. let r(t)= the record in the race and t= the number of years since 1920. (a) find a linear function that fits the data r(t)= (round to the nearest hundredth) (b)use the function in

math
in 1920 the record for a certain race was 46.9 sec. In 1990 it was 45.5 sec. let R(t) = the record in the race and t = the number of years since 1920 what is the predicted record for 2006? In what year will the predicted record be 44.98 seconds?

math (am i correct)
in 1920 the record for a certain race was 46.9 sec. In 1990 it was 45.5 sec. let R(t) = the record in the race and t = the number of years since 1920 1.)find a linear function that fits this data? 2.) use a function to predict the record in 2003 and 2006.

ALGEBRA
In 1920, the record for a certain race was 46.6 sec. In 1990, it was 45.9 sec. Let R(t)=therecord in the race and t=the number of years since 1920. a)find a linear function that fits the data. b) Use the function in (a) to predict the record in 2003 and in

math
Michael Johnson holds the olympic record for the mens 400m race at 43 seconds. His personal best for the 300m race is 31. Approximately what is the DIFFERENCE in his two unit rates?

Physics Again
In 1954 the English runner Roger Bannister broke the four minute barrier for the mile with a time of 3:59.4s (3 min and 59.4 sec) In 1999 the Morroccan runner Hicham set a record of 3:43.13s for the mile. If these two runners had run in the same race, each

physical science
The present record for the 100 meter dash is 9.58 seconds. back in 1988, Johnson ran the 100 meter dash in the world record time of 9.79 seconds. He was later to lose both his record and his gold medal to runner up Lewis because of steroid use. Calculate

Physics
A sprinter accelerates at 4 m/s2 for 3 seconds, and then runs the rest of the race at a constant speed. If the race is 100 m, how much time does the sprinter take to fi nish the race?

math
michelle runs 400 meters in 1 minute. if she completes in the 100meter race , about how many seconds will it take her to run the race?(explain how you got your answer)

Physics
A tortoise can run with a speed of 10.1 cm/s, and a hare can run 19.4 times as fast. In a race, they both start at the same time, but the hare stops to rest for 122 seconds. The tortoise wins by a shell (20.8 cm). How long does the race take? What is the

Physics
(595)Vinyl record spinning at 45rpm. What is the frequency of rotation (in Hz)? What is the orbital time of the vinyl record (in seconds)?

math
A 10 kilometer race is about 6.2 miles long. Teresa completes the race in 58 minutes. What is her average time per mile? Give your answer in minutes and seconds.

statistics
A popmusic record firm wants the distribution of lengths of cuts on its record to have an average of 129 seconds and a standard deviation of 10 seconds so that disc jockeys will have plenty of time for commercials within each 5minute period. The

Physics
A race car completes the final lap of a race on a 2kilometer circular track. At the start of the lap, it crosses the line at 60 meters/second. It completes the lap 28.57 seconds later, crossing the line at 85 meters/second. Calculate the displacement and

8th Grade Math
I need help please. I answered (c)incorrectly. Chantal and Julia ride horses in the same race. Chantal's horse finishes in one minute and 59.53 seconds. If Julia's horse runs 2.25 percent slower than Chantal's, how long does it take Julia's horse to finish

Algebra
In 1920, the record for a race was 46.9 seconds. In 1940 it was 46.5 seconds. Let R(t)= the record in the race and t= the number of years since 1920. a) Find a linear function that fits data. b)Predict the records for 2003 and 2006. c) Year when record

Intermediate Algebra
in 1920 the record for a certain race was 45.7 seconds. In 1930, it was 45.4 seconds. Let R(t)= the record in the race and t = the number of years since 1920. Find the linear function that fits the data.R(t)=__ (round to nearest hundreth. What is the

algebra
ok i don't get this one in 1920 the record for a certain race was 45.9 sec in 1980 it was 44.1 sec let r (T) = the record in the race and t= the number of years since 1920 (a) find a linear fuction that fits the data (b) use the funcation in (a) to perdict

Algebra 1
in 1920, the record for a certain race was 45.8 sec. In 1980, it was 44.6 sec. Let R(t)=the record in the race and t=the number of years since 1920. find the linear function that fits the data use the function (a) to predict the record in 2003 and in 2006

Math 116
In 1920, the record for a certain race was 45.7 sec. In 1950, it was 45.1 sec. Let Ra9ta0=the record in the race and the number of years since 1920. A. Find a linear function for the data B. Use the function in (a) to predict the record in 2003 and in

math plz help
someone plz help me.... In 1920 the record for a certain race was 46.6 sec. In 1950 it was 46.0 sec. let r(t)= the record in the race and t= the number of years since 1920. (a) find a linear function that fits the data r(t)= (round to the nearest

math
someone plz help me.... In 1920 the record for a certain race was 46.6 sec. In 1950 it was 46.0 sec. let r(t)= the record in the race and t= the number of years since 1920. (a) find a linear function that fits the data r(t)= (round to the nearest

Math
In 1920, the record for a certain race was 46.6 sec. In 1980, it was 45.4 sec. Let R(t)= the record in the race and t = the number of years snce 1920. a) Find a linear function that fits the data R(t) = b) Use the function in (a) to predict the record in

math
In 1920, the record for a certain race was 45.5 sec. In 1970, It was 44.5 sec. Let R(t)=the record in the race and t=the number of years since 1920 Predict the record for 2003 and 2006

math
in 1920 the record for a certain race was 46.4 sec. In 1960 it was 45.6 sec. Let R(t)=the record in the race and t= the number of years since 1920. a. find a linear function that fits the data. b. Use the function in (a) to predict the record in 2003 and

algebra
In 1920 the record for a certain race was 45.4 sec. in 1950, it was 41.5 sec. let R(t) = the record in the race and t the number of years since 1920. R(t)=? What is the predicted record for 2003? What is the predicted record for 2006? in what year will the

Algebra 1
In 1920 the record for a certain race was 45.1 sec. In 1960, it was 44.3 sec. Let R(t)= the record in the race t= the number of years since 1920. Thank you for your help

Algebra 1
In 1920 the record for a certain race was 45.1 sec. In 1960, it was 44.3 sec. Let R(t)= the record in the race t= the number of years since 1920. Thank you so much

Algebra 1
In 1920 the record for a certain race was 45.1 sec. In 1960, it was 44.3 sec Let R(t)the records in the race(t)=the numbeer of years since 1920. Thank you for your help.

Physics
(a) In 2009, Usain Bolt ran the last 100 meters of the 150meter race in 8.70 seconds. What is Usain Bolt’s speed? (b) The world record for the 100meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a

math
Six boys ran a 100m race.Time taken to run the race is 14 seconds. The time in seconds taken by each boy is shown below. Al  11 seconds Ben 12 Seconds Che  14 Seconds Don  12 Seconds Eze  10 Seconds and Fred  13 Seconds a) Who won the race b) For

Algebra 1
The world record for the mile was 4:10 and 3:49 in 1975. Assuming that the record improves in a linear fashion (which it has so far) write an equation to predict the mile world record (in seconds) for a given year (y=record in seconds, x=year) What should

5th grade Math
Please help me with these math problems. #1 Matt subtracted 1.9 from 20.8 and got 1.8. Explain why this is not reasonable? #2 Explain why it is easier to find 10 minus 1.9 mentally than with paper and pencil. #3 On May 27, 2001, a high school student ran a

physics
(a) In 2009, Usain Bolt ran the last 100 meters of the 150meter race in 8.70 seconds. What is Usain Bolt’s speed? (b) The world record for the 100meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a

physics
(a) In 2009, Usain Bolt ran the last 100 meters of the 150meter race in 8.70 seconds. What is Usain Bolt’s speed? (b) The world record for the 100meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a

geology
Judging from the sizes of the beforeandafter craters atop Mount St. Helens, which volcani event appears to have been more explosive, the last one before 1980, or that which occured in 1980? I thought it would be the one before 1980 since that would have

English
1. What was Henk Angenent's record?  He finished the race in 6 hours and 49 minutes. 2. What was Henk Angenent's record?  His record was 6 hours and 49 minutes. (Are both answers right?) 3. In 1963, how many percent of the skaters finished the race? 

math
I need to do a quick check for my homework by tomorrow. Sally,Jennifer,Theresa & Gina competed in a 100meter race. Sally's time for the race was 12.330 seconds. Gina's time 12.034 seconds. Theresa's time was 12.003 seconds. Gina's time was 12.031 seconds.

physics
this is a physics qustion im stuck on: ingrid holds the womans record time for a marathon race of 2h 21min 6s for 42.195km. The mens record is held by Blake grison of 2h 6 min 50s. If they had been in the same race how much would blake win by.. find this

Maths
In a race, each of the four greyhounds run at its own constant speed. They all start at the same point on a circular track and at 30 seconds into the race, while all are still on their first lap, they have spread out so they are at four corners of a

Physics
Jamaican sprinter Usain Bolt holds the world record for the men's 100 meter dash with a time of 9.58 seconds. Another runner is training to break this record and finds that he can accelerate at a constant rate of 1.07 m/s^2. Assuming that the runner starts

physics
(a)The world record for the 100meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a sprinter accelerates at a constant rate up to their maximum velocity, which is maintained for the remainder of the race,

algebra
alica finished the race 3.75 seconds before kaye. donna finished the race 5.09 seconds after carmen. carmen finished the race 10 seconds before kaye. ardens finished 4.89 seconds after kaye. how many seconds earlier did carmen finish than anders

need answer to check sons work
alica finished the race 3.75 seconds before kaye. donna finished the race 5.09 seconds after carmen. carmen finished the race 10 seconds before kaye. ardens finished 4.89 seconds after kaye. how many seconds earlier did carmen finish than anders

math
What would be the answer to85x205=960x3256 85 x 205 = 17425 960 x 3256 = 3125760 They aren't equal. Sorry. =( WAT ARE YOU ASKING EXACTLY The longest oneday bike race goes from Bordeaux, france, to paris, france. the record for this race was set in 1981 by

Physical Science
The present record for the 100 meter dash is 9.58 seconds. back in 1988, Johnson ran the 100 meter dash in the world record time of 9.79 seconds. He was later to lose both his record and his gold medal to runner up Lewis because of steroid use. Calculate

Physics (acceleration)
1. Jasmine rode a horse down a path headed north. she started from rest and then accelerated at 0.5 m/s2 for 12 seconds and then travelled at a constant speed for 28 seconds. a.) what was her velocity after 12 seconds? b.) what was jasmines displacement

Math
If Tim can swim 50 meters in 60 sec. But he slows down 12 sec the remaining race. How long does it take Tim to swim a 400 meter race. I'm not quite sure what you are asking, but I will do my best to answer you. I am assuming that "slows down 12 sec the

Physics
Two runners have a race. The first runner decides to run with his full speed v₁=9 m/s over the 250 meters of the race and then slows to v₂=7 m/s for the rest, since he's tired. The second runner wants to save energy, so he runs with v₃=8 m/s for the

science
Since 1960, the gap between rich and poor, as measured by GNP per capita, has a. decreased, then increased since 1980. b. increased, then substantially decreased since 1980. c. increased, then substantially increased since 1980. d. decreased, then

Math
4 members of a relay team each ran one lap of a race. THeir times were 58.4 seconds 58.07 seconds 57.8 seconds and 58.46 seconds. Put the numbers in order from fastest time to slowest time 57.8 58.07 58.40 58.46

PHYsics......
A race car is on a straight track. The race car accelerates from rest, covering 100 m in 5 seconds. What is the acceleration of the race car in m/s^2?

Algebra
For 1980 through 1990, the average weekly earnings (in dollars)for workers in the United States can be modeled by E= 14.5t + 270, where t is the number of years since 1980. Approximate the average weekly earnings in 1980 and 1990. I am having trouble

physics
a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds

Mathematics
When running a sprint, the racers may be aided or slowed by the wind. The wind assistance is a measure of the wind speed that is helping push the runners down the track. It is much easier to run a very fast race if the wind is blowing hard in the direction

math
An athlete runs the first 400m of a 1km race in 42 seconds. If they keep up this pace, how long will it take them to complete the race?

Math (fractions)
I am not being lazy, I've tried to get this done several times, but I am VERY bad when it comes to fractions. Barbara, Donna, Cindy, and Nicole ran in a relay race. Barbara: 3 3/10 Donna: 2 4/5 Cindy: 3 2/5 Nicole: 2 1/10 1. The four girls ran in a relay

Math *fractions*
Barbara, Donna, Cindy, and Nicole ran in a relay race. Barbara: 3 3/10 Donna: 2 4/5 Cindy: 3 2/5 Nicole: 2 1/10 1. The four girls ran in a relay race as a team. If each girl ran one part of the race, what was the team's total time? 2. Find the difference

math
michelle runs 400 meters in 1 minute. if she competes in the 100 meter race, about how many seconds will it take her to run the race?

math
Teacher: 15 seconds after the buzzer, the teacher has 135 meters to finish. 32 seconds after he left the starting line, the teacher has run 50 meters left. Usian Bolt: 22 seconds after the buzzer, Usain has 189 meters to finish.36 seconds after the buzzer,

math
Michelle runs 400 metersin 1 minute. if she completes in the 100meter race,about how many seconds will it take her to run the race?(explain how you got your answer)

algebra
Alicia finished the race 3.75 seconds befor Kaye. Donna finished the race5.09 seconds after Carmen. Carmen finished the race 10 second before Kaye. Anders finished 4.89 seconds after Kaye. How many seconds earlier did Carmen finish than Anders?

physics
A tortoise can run with a speed of 11.5 cm/s, and a hare can run 21.4 times as fast. In a race, they both start at the same time, but the hare stops to rest for 126 seconds. The tortoise wins by a shell (18.3 cm). How long does the race take? What is the

Calculus
Two people, Paige and Sandy, are racing each other. Assume that both their accelerations are constant, Paige covers the last 1/8 of the race in 5 seconds, and Sandy covers the last 1/5 of the race in 8 seconds. Who wins, and by how much?

History
What makes 18901920 the nadir of race elections? I am doing my History study guide, and they just randomly popped that question in therei don't even know what it means, and we CERTAINLY never learned it in class!

math
In a motorcycle race, one lap of the course is 650 m. At the start of the race, John sets off 4 seconds after Tom does, but John drives his motorcycle 5m/s faster and finishes the lap 2.5 seconds sooner than Tom does. What is the speed at which each of

Mathematics
The Hare and the Tortoise are running a 100 metre race. The Hare can run 20 meters in 5 seconds. While the Tortoise ambles along at 2 meters every 5 seconds. Confident of an easy win, the Hare stops to nibble on some tasty wild carrots nearby. If the race

math 8
algebraic expression for word problem. Elmore finished the race in 131 seconds. This is 17 seconds less than Calos took. How many seconds did Carlos take? I put 17 x = 131 is that right

Calculus
A radar gun was used to record the speed of a racecar during the first 40 seconds while driving on a straight road. Use the chart to calculate the car's distance after 40 seconds using righthand sums. Is this an over or underestimate? Justify the answer.

gallegos
"Robert can swim the first 50 meters of a race in 1 minute. Then he slows down by 12 seconds for each of the next 50 meters of a race. How long will it take Robert to swim a 400meter race?

Math 116
Correction Let R(t)= the record in the race.

physical science
A car go from 060 mi/hr in 8 seconds. During the race, the car travled at a constant speed of 10 mi/hr for 5 seconds before accelerating to its stop speed of 220 mi/hr. During the race, what was the total time it took the car to reach its stop speed?

Physics
The Yukon Quest, an annual dogsled race between Whitehorse in the Yukon and Fairbanks in Alaska, covers a gruelling distance of 1.61 × 103 km. Assuming that the average speed of the dog team that set a course record is 6.28 km/h, determine the best time

physics
Olympic champion Justin gaitlin set a new world record for 100.0 m sprint at the last lympics by clocking 9.86 s for the race.Calculate a)His average speed for the race b)Assuming that he accelerated uniformly for the first 4.86 s after taking off the

8th grade Math
need help please. I answered (c)incorrectly. Chantal and Julia ride horses in the same race. Chantal's horse finishes in one minute and 59.53 seconds. If Julia's horse runs 2.25 percent slower than Chantal's, how long does it take Julia's horse to finish

Math  8th Grade
I need help please. I answered (c)incorrectly. Chantal and Julia ride horses in the same race. Chantal's horse finishes in one minute and 59.53 seconds. If Julia's horse runs 2.25 percent slower than Chantal's, how long does it take Julia's horse to finish