Your brother opens a beach house to rent out during the summer. he spends $840 preparing the house to rent, and his cost for utilities and cleaning is $25 per night. he charges $95 per night to rent the room. how many nights until he breaks even?

960

Step-by-step explanation:

$840+( $25+$95)=960

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