Brainleist answer to whoever gives me correct answer first

Acar with a mass of 600 kg is traveling at a velocity of 10m/s. how much kinetic energy does it have?

What are “like terms”? why can we only add like terms?

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.