Answer:

Step-by-step explanation:
√(-100)
Use the imaginary number rule 
√(-1) × √(100)
i × √(10²)
i × 10
= 10i
A fraction that is equivalent to 1/4 is 25/100
Step-by-step explanation:
or, 6m=5/13
or, m=5/13 ×6m
m=30/13
Nineteen and two hundred and thirty eight thousandths
It would be C because the 40° is acute and the last degree is obtuse