Aphone company charges a flat rate of $15 to make phone calls for a month. they charge $0.10 per minute for each call made. if the want to make at least $60 from one customer, how many minutes do they have to talk

450 minutes

Step-by-step explanation:

15 + 0.1x = 60

15 - 15 + 0.1x = 60 - 15

0.1x = 45

x = 450

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

i think the answer is b