6(-m-3)=-36 i don't completely understand this it's called "multi step equations

Write a polynomial that fits the description: a third-degree polynomial with leading coefficient -4

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?

An octagonal prism has jow many lateral faces?