Answer these distance problems
1. vera travel to boston by car. going there took her 4 hours and her return trip lasted 3 hours. she averaged a speed of 56 mph while returning. find her average speed on the way to boston.
2. sal left the city traveling at 54 mph, wow, at the same time, mel left the city going in the opposite direction at a speed of 62 mph while returning. find the time sal traveled before the two were 174 miles apart.
3. how long will it take a train traveling at an average speed of 54 miles per hour to travel 297 miles?
4. how far will they train travel in one hour and 30 minutes hours if it is moving at an average speed of 48 mph?
5. a flock of migratory birds can fly 77 miles in 3 1/2 hours. how fast do they fly?

Name and describe the three most important measures of central tendency. choose the correct answer below. a. the mean, sample size, and mode are the most important measures of central tendency. the mean of a data set is the sum of the observations divided by the middle value in its ordered list. the sample size of a data set is the number of observations. the mode of a data set is its highest value in its ordered list. b. the sample size, median, and mode are the most important measures of central tendency. the sample size of a data set is the difference between the highest value and lowest value in its ordered list. the median of a data set is its most frequently occurring value. the mode of a data set is sum of the observations divided by the number of observations. c. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is the product of the observations divided by the number of observations. the median of a data set is the lowest value in its ordered list. the mode of a data set is its least frequently occurring value. d. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is its arithmetic average. the median of a data set is the middle value in its ordered list. the mode of a data set is its most frequently occurring value.

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cot of 61.6