Solve the problem.How many 2-letter codes can be formed using the letters A, B, C, D, E, F, G, H, and I. Repeated letters are allowed.
A. 512
B. 36
C. 72
D. 81
Answer: D
Mathematics
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Solve.A 53-kg skateboarder on a 3-kg board starts coasting on level ground at 8 m/sec. Let k = 3.2 kg/sec. How long will it take the skater's speed to drop to 2 m/sec?
A. 24.26 sec B. 1.30 sec C. 22.96 sec D. -24.26 sec
Mathematics
Divide and express the result in standard form.
A. 1 B. -1 C. -i D. i
Mathematics
Solve the problem.Find real numbers a, b, and c such that the graph of the function y = ax2 + bx + c contains the points (1, 1), (2, 4), and (-3, 29).
Fill in the blank(s) with the appropriate word(s).
Mathematics
A rod 
in. long has been cut as shown in the illustration. Assume the waste in each cut is 
in. What is the length of the remaining piece?
A. 
in.
B. 
in.
C. 
in.
D. 
in.
E. 
in.
Mathematics