What is the measure of ONE interior angle in a nonagon?

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points

What is the inverse of f(x) = 6x -24