Write the expression in the standard form a + bi.
A. 
- 
i
B. 
- 
i
C. 
+ 
i
D. 
- 
i
Answer: C
Mathematics
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Evaluate the requested trigonometric function using the information given. cos ? = 
; 0 < ? < ?/2Find sec ?.
A. 
B. 6
C. -6
D. 
Mathematics
Replace the polar equation with an equivalent Cartesian equation.r = 
A. 8y - 9x = 1
B. 
+ 
= 1
C. 
= 1
D. 8x - 9y = 1
Mathematics
Solve the rational inequality.
? 0
A. [-9, 1) ? [2, ?) B. (-?, -9] ? [2, ?) C. (-?, -9] ? (1, 2] D. [-9, 1) ? (1, 2]
Mathematics
The measure of an acute angle is a number, n, such that:
(a) 0° ? n ? 90°
(b) 0° < n ? 90°
(c) 0° ? n < 90°
(d) 0° < n < 90°
(e) 0°
Mathematics