Solve the problem.An airplane took 5 hr to fly 600 mi against a head wind. The return trip with the same wind took 2 hr. Find the speed of the plane in still air.
A. 90 mph
B. 210 mph
C. 300 mph
D. 120 mph
Answer: B
Mathematics
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Graph the linear inequality.x > 4 
A. 
B. 
C. 
D. 
Mathematics
Which federal law prompted states to write mathematics learning expectations for students?
a. Public Law 94-142 b. A Nation at Risk c. Equal Educational Opportunity Act d. No Child Left Behind
Mathematics
Factor by grouping.x5 - x4 + 8x - 8
A. (x4 - 1)(x + 8) B. (x4 - 8)(x - 1) C. (x4 + 8)(8x - 1) D. (x4 + 8)(x - 1)
Mathematics
Suppose that a certain radioactive substance has a half-life of 45 years. If there are presently 1,920 milligrams of the substance, how much, to the nearest milligram, will remain after 180 years?
A. Q = 130 milligram B. Q = 120 milligram C. Q = 135 milligram D. Q = 95 milligram E. Q = 125 milligram
Mathematics