Estimate the number of cells in a(n) 78-kilogram (172-pound) person, assuming the human body is 100% water (actually it is 60 dash70% water) and that 1 liter of water weighs 1 kilogram.

15. jiovanni is looking in to two different companies that offer study guides for math exams.test prep 101 charges a $5 flat fee and an additional $0.25 per problem.math charges a $2 flat fee and an additional $0.50 per problem.how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {