2. A health insurance plan has a $30 prescription deductible and a copayment of $10 for the cheapest tier of medicines. The function f(x) = 10x +30 gives the cost of filling x of these prescriptions. What is the reasonable domain and range of
the function in the context?
Domain:
Range:

Planet earth has a mass of 5.9726x10²⁴ kg.then: 5.9726x10²⁴ kg=100% of the total earth mass.if the water´s mass=5x10-4 % of the total mass, we can solve this problem by the rule of three.5.9726x10²⁴ %*10⁻⁴ %x=(5.9726x10²³ kg)(5*10⁻⁴  %) / 100 %=2.9863x10¹⁹ kganswer:   the mass of the planet´s water would be   2.9863 x 10¹⁹ kg.