What complex number does the point (-3, 5) represent on the complex plane?

3 + 5i

3 – 5i

-3 + 5i

-3 – 5i

Simplify 6i – (9 – 2i).

9 + 4i

9 + 8i

-9 + 4i

-9 + 8i

Completely simplify `sqrt(-20)`.

`isqrt(20)`

`sqrt(20i)`

`2isqrt(5)`

`4isqrt(5)`

Which of these is equal to 5?

(1 + 2i) (1 – 2i)

(1 + 2i) (1 + 2i)

(3 – 2i) (3 – 2i)

(3 + 2i) (3 – 2i)