Ascale model of a building is 30centimeters tall. when the building is completed, it will be 240 meters tall. what is the model's scale?

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.

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)