Write the expression as a complex number in the form a + bi.
+ 
A. 0 - 15i
B. 0 + 15i
C. 0 + 56i
D. -15 + 0i
Answer: B
Mathematics
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Use a calculator to find the approximate value of the expression. Round the answer to two decimal places.cot 0.2038
A. 0.98 B. 0.21 C. 4.84 D. 1.02
Mathematics
Write the rational expression in lowest terms.
A. - 
B. 
C. 
D. 
Mathematics
The given pattern continues. Write down the nth term of the sequence {an} suggested by the pattern.-1, 1, 3, 5, 7, ...
A. an = n + 2 B. an = 2n - 3 C. an = 3n - 2 D. an = -1(2)n-1
Mathematics
Determine if the following is an identity.cos2x - sin2x = 1 - 2 sin2x
A. Identity B. Not an identity
Mathematics