Find a unit vector that has the same direction as the given vector.r = 
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Write the first four terms of {an}.an = 3n
A. 0, 3, 9, 27 B. 3, 6, 9, 12 C. 3, 9, 27, 81 D. 1, 3, 9, 27
Mathematics
Solve the problem.Benjamin never has more than 21 hours free during the week. He is trying to make a weekly plan for dividing his free time between reading and working out. He wants to spend at least 8 hours per week reading. Write a system of inequalities to describe the situation. Let x represent the number of hours for reading and y represent the number of hours for working out.
A. x + y ? 21 x ? 8 y ? 0 B. x + y ? 21 x ? 8y x ? 0 y ? 0 C. x + y ? 21 x ? 8y x ? 0 y ? 0 D. x + y ? 21 y ? 8 x ? 0
Mathematics
Add or subtract.
+ 
A. 
B. 
C. 
D. 5x + 1
Mathematics
Express using positive exponents. Then simplify.
A. 
B. mx
C. x-m
D. xm
Mathematics