Simplify the expression. Write the answer using positive exponents.
A. 
B. 4r-5
C. 4r5
D. 4
Answer: C
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Solve the problem.A 100 gal tank is half full of distilled water. At time = 0, a solution containing 2 lb/gal of concentrate enters the tank at the rate of 4 gal/min, and the well-stirred mixture is withdrawn at the rate of 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. 187.5 pounds B. 175 pounds C. 150 pounds D. 200 pounds
For the given data value, find the standard score and the percentile.A data value 1.3 standard deviations above the mean.
A. z = -1.3; percentile = 9.68 B. z = 1.3; percentile = 2.2 C. z = 1.3; percentile = 90.32 D. z = 0.13; percentile = 55.96
Decide which of the 5 properties of a commutative group (closure, identity, inverse, associative, commutative) hold for the given system.
A. Closure, identity, associative, and commutative only B. None of them C. Closure, identity, inverse, and associative only D. Closure, identity, and commutative only
Provide an appropriate response.Several government agencies insure the repayment of first mortgage loans, including:
A. Veterans Administration B. Federal Housing Administration C. both the Federal Housing Administration and the Veterans Administration D. Social Security Administration