Which equations are true? select all that apply. options:
square root of -4 = 2i
square root of -49 = 7i
square root of -25 equals
square root of -25i
negative square root of 36 = 6i
negative square root of 81 = -9
negative square root of 100 = 10i

The correct options are,

Square root of -4 = 2i

Square root of -49 = 7i

Step-by-step explanation:

∵

( Since, i² = - 1 )

Similarly,

Also,

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.