Please help me with these it’s due TODAY ( This is Simplifying expressions in 7th grade)

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

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.

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?