Find the exact acute angle ? for the given function value.cot ? = 
A. 45°
B. 60°
C. 30°
Answer: C
Mathematics
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Solve by trial.y ? 2 = 10
A. 6 B. 5 C. 4 D. 0
Mathematics
Express the number in scientific notation.0.0000004
A. 4 × 10-6 B. 4 × 10-8 C. 4 × 10-7 D. 4 × 10-9
Mathematics
Determine if the graph of the function is concave up or concave down.y = (x + 2)2
A. Concave down B. Concave up
Mathematics
Simplify the expression. Assume all variables represent positive real numbers.
A. 
B. 
C. 
D. 
Mathematics