Answer:
x= x ≥ 2 or x ≤ -2
Step-by-step explanation:
Answer:
168
Step-by-step explanation:
Arcsin (2/5) = arctan(2/√21)
now as tan (arctan (x) ) = x
hence tan (arctan (2/√21)) = 2/√21 = 0.436
ask if you do not understand the first part
Answer:
15.
Step-by-step explanation:
The new average will be 11 + 4 = 15.