Bella spent 5/8 on her money on books and notebooks. she has $45 left. how much money did she spend on her books and notebooks/ ( show steps! )

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.