Please help I do not understand this at all and I need help

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)?

Ihave trouble finding the nth term of a linear sequence

Solve the equation x/4 - 5= -8 -27 -12 -7 12