What is the solution set of the equation x2+3×-4=6

Which ratio is equivalent to 10: 85

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 you could answer these your a life saver