Find the product. Write the product in rectangular form, using exact values.[7(cos 120° + i sin 120°)] [2(cos 90° + i sin 90°)]
A. 5
- 
i
B. -7
- 7 i
C. 7
- 28 i
D. 14 - 14
i
Answer: B
Mathematics
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Use an Euler diagram to determine whether the argument is valid or invalid.Some cars are considered sporty.Some cars are safe at high speeds.Some sports cars are safe at high speeds.
A. Valid B. Invalid
Mathematics
Provide an appropriate response.If there is a 15% gratuity built into a dinner check, what is the final bill on an order of a party whose food came to $124?
A. $132.27 B. $139.00 C. $142.60 D. $18.60
Mathematics
Find the range of the set of numbers.5, 0, 15, 17, 14
A. 10 B. 14 C. 17 D. 31
Mathematics
Solve the equation.b(b + 11) = 0
A. {11, 0} B. {1, -11} C. {-11, 0} D. {-1, -11}
Mathematics