R/3 + 5 < 8

r=9
r=12
r=15​

Sum is 17 and their difference is 3

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?