First distribute:
7 x 5x + 15 + 4x + x + 2
Then combine like terms:
7 x 10x + 17
Lastly, multiply:
70x + 17
Fully simplified. Hope this helps!
Answer:
Let
and
.
a)

b)

c) Now we calculate the direction of
and 
We calculate the direction of
like this:
. Since,
, then the direction of
is
.
Now, for 
.
Answer:
Image?
Step-by-step explanation: