One side of the rectangle is 7 cm, and the other is b cm. Set the formula for the dependence of the perimeter P of the rectangle on b.
Consider rectangle ABCD.
If one side AB = 7 and side BC = b, then
side CD = AB = 7 and BC = AD = b.
In our case, the perimeter of the rectangle depends on the unknown variable b, i.e. Is a function of b.
We get an idea:
P (b) = AB + BC + CD + AD = 7 + b + 7 + b = 2 * (b + 7),
P (b) = 2 * (b + 7).
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.