What is the gradient of a line perpendicular to a line with a gradient of 2/3?

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)?

With alll of except for the 2 that i did already

Can someone me with my math problems i have a bunch. i will give brainliest and lots of pleeeaaasssee