How can you tell before dividing that the first digit of the quotient 2,874 divided by 3 is in the hundreds place?

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)?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Ron has 8 caps and 4 of his caps are blue. thes rest of his cap are red. how many of ron's caps are red