Answer:
ABCD is a square and a rectangle, just graph the points to see the shape it makes
Recall that

Dividing both sides by cosh²(x) gives

Also, recall the identity

Then

Answer:
Option 3)............... I guess so
Answer: 40
Step-by-step explanation:
maybe
Answer:
correct. the mean of 72 and 89 is 80?5
Step-by-step explanation:
find the mean to confirm it.
(a+b)/2
72+89= 161
161/2=80.5