Find the inverse, if it exists, for the matrix.
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Evaluate the expression.71
A. 7
B. 1
C. -7
D. 
Mathematics
Solve the problem.Suppose f(x) = 30.2 + 1.3 log (x + 1) models salinity of ocean water to depths of 
at a certain latitude. x is the depth in meters and f(x) is in grams of salt per kilogram of seawater. Approximate the salinity (to the nearest hundredth) when the depth is 609 meters.
A. 82.82 B. -26.58 C. 33.82 D. 85.42
Mathematics
Solve the problem.The mathematical model 
represents the cost in dollars a company has in manufacturing x items during a month. How many items were produced if costs reached $140,000?
A. 139,800 items B. 600 items C. 500 items D. 800 items
Mathematics
Multiply.
2
A. 81x2 - 
B. 81x2 - 
x - 
C. 
x2 - 2x + 81
D. 
x2 + 2x - 81
Mathematics