Answer:
Step-by-step explanation:
the answer is 1.
Height would be 21 inches, depth would be 5.
Answer:
Step-by-step explanation:

{-9-(-3)=6 and 3-(-3)=6 and 9-3=6 and 15-9=6}
An arithmetic sequence is: 


one thing to be noteworthy is that this triangle has two angles, a 60° one and a 90° one, meaning the last angle will be a 30° one, thus we can use the 30-60-90 rule.
Check the picture below.
89+90=171. keep in mind that increased or increased by means to add