will give brainliest! pls help and give a quick summary for each.. i am learning trig but i really don't understand anything

On saturday morning, calls arrive at ticketmaster at a rate of 108 calls per hour. what is the probability of fewer than three calls in a randomly chosen minute?

Ageologist had two rocks on a scale that weighed 4.6 kilograms together. rock a was 0.5 of the total weight. how much did rock a weigh?

What is the range? can’t seem to find it out