Perform the indicated operation. Write the answer in the form a + bi.7(cos 45° + i sin 45°) ? 2(cos 90° + i sin 90°)
A. 2
- 
i
B. -14
- 14
i
C. -7
+ 7
i
D. 7
- 28
i
Answer: C
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Factor.5x2 - 14x - 24
A. (5x + 6)(x - 4) B. (6x + 5)(x - 4) C. (x + 5)(x - 4) D. (x - 6)(x - 4)
Referring to triangle ABC, find the area of the triangle.
?
?
Round to three significant digits.
?
A. 1,470 inches2 B. 1,430 inches2 C. 1,530 inches2 D. 1,390 inches2 E. 1,450 inches2
Factor by grouping.8x2 - 10x + 20x - 25
A. (2x - 5)(4x + 5) B. (8x - 5)(x + 5) C. (8x + 5)(x - 5) D. (2x + 5)(4x - 5)
Solve. Answer with a complete sentence.Sunita works in a clothing store and she receives a commission on everything she sells. Last week she worked 34.25 hours and earned a total of $249.25 in commission sales. How much commission did Sunita earn, on average, each hour? Round to the nearest cent if necessary.
A. Sunita earned, on average, $7.28 commission each hour. B. Sunita earned, on average, $7.38 commission each hour. C. Sunita earned, on average, $7.30 commission each hour. D. Sunita earned, on average, $7.26 commission each hour.