10 coins. 70 divided by 7equals 10
Answer:
The greatest common factor of the given expressions is

Step-by-step explanation:
Given that 
can be written as

can be written as

and
can be written as

Comparing the common factors we have
is the greatest common factor of 
Therefore the greatest common factor of the given expressions is

Answer:
(4,6)
Step-by-step explanation:
quadrant 1 always has positive coordinates so the only one with all positive coordinates is (4,6)
Answer:
Step-by-step explanation:
sin²x + cos²x = 1 ⇒ cos²x = 1 - sin²x
= 1