Solve the problem.Three trains - one eastbound, one westbound, and one northbound - leave a city at the same time. The speed of the northbound train is 20 miles per hour greater than the speed of the eastbound train. After 3 hours, the distance between the westbound train and the eastbound train is 300 miles. Twice the speed of the westbound train is 60 miles per hour more than the speed of the northbound train. Find the speeds of the three trains.
A. eastbound, 60 mph; westbound, 60 mph; northbound, 40 mph
B. eastbound, 30 mph; westbound, 70 mph; northbound, 60 mph
C. eastbound, 50 mph; westbound, 60 mph; northbound, 70 mph
D. eastbound, 40 mph; westbound, 60 mph; northbound, 60 mph
Answer: D
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If an average-sized man falls with a parachute, then his velocity 
, in feet per second, t seconds into the fall is given by
.
?
During which period will his velocity be between 9.99 and 12.99 feet per second? Round to two decimal places.
A. From 0.65 seconds on B. From 9.77 seconds on C. From 0.43 to 0.65 seconds into the fall D. From 4.88 to 9.77 seconds into the fall
Determine whether the statement is true or false.-138 = (-13)8
A. False B. True
Solve the problem.A deep-sea diver dives from the surface to 206 meters below the surface and then swims up 11 meters, down 16 meters, down another 27 meters, and then up 22 meters. Find the diver's depth after these movements.
A. 238 meters below the surface B. 216 meters below the surface C. 162 meters below the surface D. 130 meters below the surface
Solve.45m2 + 93m + 47 = 0
A. 
B. 
C. 
D. 