If a number is a natural number, then it is also a whole number? Inverse
Truth value
converse
truth value
contrapositive
truth value
bi-conditional
truth value

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.