imaginary numbers help!!!

i can't seem to answer these because i can't understand it..please help..

Simplify the expression i2000049

a. -1 b. –i c. i d1/i

The simplify ( -i + 2)2..

a. 3 – 4i b 4 -3i c. 4i d. 3i

The value of [(√-144) – 12i)]is ______.

a. 0 b.-1 c.1 d. 12i

Simplify √-49 - √-36.

a. 4i√2 b. 2i√2 c. 3i√2 d.i

Which is the sum of (23i - 6) and (-√100 + 16i)?

32i + 16 b. 30i + 24 c. 31i +14 d. 39i – 16

What is the equivalent of *i16 * + i48?

a. 2 b. -1 c. –i d. i

What is the equivalent value of the expression (i17 + i27)2?

a. 16 b. 12 c. 0 d. 8

Which is the value of ( 5 – i)2?

a. -24 + 10i b. 24 - 10i c. -24 – 10i d. 24 + 10i

What is the equivalent value of the expression (2 + 2 i)2?

a. 2√2cis45 b. 2√2cis90 c. 4√2cis45

thanks a lot!!please provide the solutions!