Answer:
See explanation
Step-by-step explanation:
We want to show that:

One way is to use the basic double angle formula:


We simplify further to get:

We simplify again to get;

This finally gives:

#6 is incorrect
it's 6 7/8
#7 is correct
Answer:
the other side would be 15
Step-by-step explanation:
because 15 is bigger than 12 and the 12 is the bottom line and then the other line going up is 15 so it's equal.
Answer:
2n+7
Step-by-step explanation:
find the difference
and see the difference from the 2 Times table to the original sequence
and write it as an equation for this sequence