a tower is 50m high its shadow is x meters shorter when the suns altitude is 45 degree than when it is 30 degree, find x correct to the nearest cm

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

Can someone me with these two circle theorem questions asap?

Which fraction is equal to 1hole and 2/5? a.3/5 b.75 c.57 d.73