Need some major on simplifying non-perfect roots, ?

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?