1.In the sequence an=2n²-6n, what is |2a6-5a4|?

2.if an =|5-8n|, find 4a5-2a3?

3.given an =2n²-5, find |3a5-2a4-4a²|

4.in an =3n-5, what if 7aa-5a2

5.in an =3n-2, which is greater, a5 or a7m 4n-1

6.if an =4n+7 what is a4+5a3?

7. if an =5-2n³, what is 2a6+3a5?

8.if an =2n²-3 what is 2a4?

9.if an =3n-1 what is 5a3?

10.what is a7 if an=3n²+1?

help pls​