Ido not understand this can some one me

Which math sentence can be used to determine if the triangle is a right triangle?

Igor stravinsky tires sells approximately 3,760,000 car tires and 1,200,000 truck tires each year. about 47,000,000 care tires and 26,000,00 truck tires are sold each year in the united states. what is stravinsky's market share in each of these two markets (cars and trucks)?

If g^-1(x) is the inverse of g (x) which statement must be true