Carla and vicki left the house at the same
time and began traveling down the same
road in the same direction. carla drove at
a speed of 60 mph and vicki at a speed of
65 mph. how many hours was it before
vicki was 20 miles ahead of carla?

Write 17/20 as a decimal and as a percent.

Afew weeks ago, vera bought 5 apples from her local farmers' market. today, she bought 4 apples. what is the percent of decrease in the number of apples bought?

Among the most famous of all meteor showers are the perseids, which occur each year in early august. in some areas the frequency of visible perseids can be as high as 40 per hour. given that such sightings are poisson events, calculate the probability that an observer who has just seen a meteor will have to wait at least five minutes before seeing another.