Solve the number problem by finding the value of the unknown number.The product of 5 and a number is the same as 28 less twice that same number.
A. -4
B. 4
C. 14
D. -14
Answer: B
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Solve the problem.An office contains 1000 ft3 of air initially free of carbon monoxide. Starting at time = 0, cigarette smoke containing 4% carbon monoxide is blown into the room at the rate of 0.5 ft3/min. A ceiling fan keeps the air in the room well circulated and the air leaves the room at the same rate of 0.5ft3/min. Find the time when the concentration of carbon monoxide reaches 0.01%.
A. 6.01 min B. 5.01 min C. 7.01 min D. 8.01 min
Solve the problem.Your electrical bill states that you used 770 kilowatt-hours of energy in January. Determine your total electrical energy use, in joules.
A. 277,200,000 joules B. 2,772,000,000 joules C. 246,400,000 joules D. 2,464,000,000 joules
Use rational exponents to simplify the expression, if possible. Then, write the answer in radical form.
? 
A. Cannot be simplified
B. 
C. 
D. 
Determine if the given set of whole numbers is closed under addition.{1, 3, 5, 7, . . . }
A. Closed B. Not closed