Answer:
if one of the angles is 90°
Step-by-step explanation:
when it has an angle that is 90° that means that it is a right triangle
let me know if you need more b/c I wasn't sure whether to make it more advanced for middle school lol
Hope this helps! :)
Answer:

Step-by-step explanation:
A sequence that has a common difference is an <em>arithmetic sequence</em>:

where aₙ is the nth term, n is the index, and d is the common difference.
In your question:
Plug those into the formula:

Then solve:

Here is the factored polynomial
(x^2+9)(x^2-3x-9)=0
Q is equidistant from A , B...