Help meee plz and fast

What signals you that factoring by grouping is the best method to use when factoring a problem?

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)?

Write a story that matches with the expression 42x-5 pls hurry