Find the unit vector in the same direction as the given vector.v = 4i + 3j
A. u = 
i + 
j
B. u = - 
i - 
j
C. u = 
i + 
j
D. u = 20i + 15j
Answer: A
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Solve the problem.A company determines that its marginal cost, in dollars, for producing x units of a product is given by 
where x ? 1. Suppose that it would be possible for the company to make infinitely many units of this item. Find the total cost. Round to the nearest dollar.
A. $21,550 B. $21,480 C. $21,400 D. $21,500
Determine whether the argument is valid or invalid by using a truth table.p ? qp ? r----? ~ r ? q
A. 
The argument is valid.
B. 
The argument is invalid.
C. 
The argument is invalid.
D. 
The argument is invalid.
Graph the polar equation.r = 
A. 
B. 
C. 
D. 
Add or subtract. Simplify by combining like radical terms, if possible. Assume all variables and radicands represent nonnegative numbers.7 
- 4m2p 
A. 3
B. 11m2p 
C. 3m2p 
D. Can't simplify