Aparticle moves with velocity function v(t) = −t2 + 5t − 3, with v measured in feet per second and t measured in seconds. find the acceleration of the particle at time t = 3 seconds.

1) what is the measure of the exterior angle, ∠uvw ? 2) in triangle man, what is the measure of the exterior angle at n (in degrees)?

The anwser cause i do not understand just plez

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.