Write the complex number in rectangular form using exact values if possible. Otherwise, round to one decimal place.5.34(cos 128.6° + i sin 128.6°)
A. -1.4 + 1.8i
B. -3.3 + 4.2i
C. 1.4 - 1.8i
D. 4.2 - 3.3i
Answer: B
Mathematics
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Factor. Check by multiplying.21x + 6y - 15
A. 27(x + y) - 15 B. 3(7x + 6y - 5) C. 3(7x + 2y - 5) D. 3(7x + 6y - 15)
Mathematics
Use the minimum and maximum features of a graphing calculator to find approximately the intervals on which the function is increasing or decreasing. Round your values to two decimal places, if necessary.y = 
+ 
- 10
A. inc (10, ?), dec (-?, 2) B. inc (2, ?), dec (-?, 6) C. inc (-?, -2), dec (6, ?) D. inc (6, ?), dec (-?, -2)
Mathematics
Subtract and check.
A. 6744 B. 4698 C. 4744 D. 4738
Mathematics
Find the exact value of the following expression without using a calculator.sec 
A. 2
B. 
C. 
D. 
Mathematics