Samuel is saving money to buy a skateboard that cost $90. He is saving $18 a week. How many weeks will it take him to save enough money to buy the skateboard?

1. during first 10 seconds 2. between 10 seconds and 35 seconds 3. during 35 seconds to 40 seconds

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?