Answer: Yes, it is an obtuse triangle
Step-by-step explanation:
Answer:
Is there a graph that we need to look at
B= -20+45/56
B=-20.80
Common difference (d) = -5
formula=>
an = a + (n-1)d
=> -8 = 7 + (4-1)d
=> -15 = 3d
=> 3d = -15
=> d = -15/3
=> d = -5
