Perform the indicated operations and express your answer in the form a + bi. 
A. 5i
B. -i
C. ±5
D. -5i
Answer: A
Mathematics
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Solve the problem.At the end of the day, a storekeeper had $1560 in the cash register, counting both the sale of goods and the sales tax of 4%. Find the amount that is the tax.
A. $55 B. $50 C. $65 D. $60
Mathematics
Solve the problem.Using the following properties of a twice-differentiable function y = f(x), select a possible graph of f.
A. 
B. 
C. 
D. 
Mathematics
Decide whether the figure shown is a polyhedron.
A. Not a polyhedron B. Polyhedron
Mathematics
Solve the equation by completing the square.x2 = 3 - 4x
A. {-2 ± 2
}
B. {-1 ± 
}
C. {-2 ± 
}
D. {2 + 
}
Mathematics