The general term for the sequence 
<h3><u>Solution:</u></h3>
Given sequence is -3, 6, -9, 12, -15
We have to find the general term of sequence
The terms in the sequence are found out by using the recursive definition:

Let us use this definition to find out the terms and check if it matches our given sequence

Thus the general term is given by 
Answer:
Graph will open same way and is narrower.
Step-by-step explanation
If: f(x)= x^4
f(-2x)= (-2x)^4
Negative sign usually flips the graph and make it open to the opposite direction. In this case since the function is to the 4th degree and the negative sign is included. The negative is basically ignored.
The term in front of x (a) determines how wide the graph opens. The bigger the a value the faster the slope increases so the narrower the graph opens.
Think if the slope is 4 vs 1/4.
Hope this helps
Try the suggested explanation (it consists of 3 basic steps).
ANSWER
The two lines are perpendicular if 
EXPLANATION
Given two lines:

and

We can tell wether these two lines are perpendicular to each other using their slopes.
If the product of their slopes is -1, the then the two line are perpendicular.
For example:
The line

has slope

and the line

has slope

The product of the two slopes is

This implies that:

Therefore the two lines are perpendicular.