Stuck :(

Question

1. Simplify (5-√-36)(2+√-1)
A. 16 − 7i
B. 16 + 7i
C. 4 + 7i

2. Choose the point that lies on the curve r = 2 – 3 sin θ.
A. (-5, 3π/3)
B. (-2, π)
C. (1, π/2)

3. Which of the following is not an approximate solution of x5 – 1 = 0?
A. 0.3090 – 0.9511i
B. 0.8090 + 0.5878i
C. 0.3090 + 0.9511i
D. –0.8090 + 0.5878i

4. Simplify (√2-3i)²
A. -7-6√2i
B. 2-9i
C.-5-6√2i

5. Simplify (2√cis47°)(3√8cis89°)
A. 48 cis 223°
B. 48 cis 136°
C. 12 cis 136°

Answer 1

(A)
none (2,π) is, but not (-2,π)
(B)
(A)
(B) if you meant (2√8 cis47°)(3√8 cis89°)