Solve ?STC, round to the nearest tenth.
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Add or subtract, if possible. Assume that all variables represent non-negative values. Simplify your answer. 6 
- 9
+ 4 
+ 4
A. 10 
- 5
B. 10 
- 5
C. 10 
- 5
D. 5
Row-reduce the matrix associated with the given system to determine whether the system of linear equations is inconsistent or has dependent equations. x + 5y = 5-4x - 20y = -20
A. Inconsistent B. Dependent
Find all values that make the expression undefined.
A. 
B. 2
C. 2, -2
D. 4
Solve the problem. Express the answer in scientific notation to two decimals unless requested otherwise.Assume that the volume of the earth is 5 × 1014 cubic meters and the volume of a bacterium is 
cubic meters. If the earth could be filled with bacteria, how many would it contain?
A. 2.0 × 10-30 bacteria B. 5.0 × 10-31 bacteria C. 2.0 × 1030 bacteria D. 5.0 × 1031 bacteria