first
second
and fifth are true
Basically the square root of -1 is i. From that you should be able to deduce the answers.
Answer:i think its 80 cm
Step-by-step explanation:
B and c
give me brainliest plsss
It may be easier to start from
.. a(x +3)(x -1) = 0
.. a(x^2 +2x -3) = 0
The quadratic
.. ax^2 +bx +c = 0 will have solutions -3 and 1 for ...
.. a ≠ 0
.. b = 2a
.. c = -3a
You can start by converting from degrees to radians and using the relation

Or just set up the proportion equation,