Solve.The highest point at at oil drilling operation is the top of the 78-foot-high oil drilling rig. The lowest point the drill head has reached so far is -230 feet. How far above the drill head is the top of the oil drilling rig?
A. 308 ft
B. -230 ft
C. 152 ft
D. -308 ft
Answer: A
Mathematics
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Solve the problem.A 200 gal tank is half full of distilled water. At time = 0, a solution containing 1 lb/gal of concentrate enters the tank at the rate of 4 gal/min, and the well-stirred mixture is withdrawn at the rate of 
When the tank is full, how many pounds of concentrate will it contain?
A. 150 pounds B. 120 pounds C. 100 pounds D. 200 pounds
Mathematics
Evaluate using the order of operations.
A. 154 B. 98 C. 44 D. 1582
Mathematics
Find the logarithm. Give an approximation to four decimal places.log 2.38
A. 0.3766 B. 0.8671 C. 0.3579 D. 0.3945
Mathematics
Find the difference.- 
- 
A. - 
B. - 
C. - 
D. 
Mathematics