Help me with this pleaseee

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

How can you construct perpendicular lines and prove theorems about perpendicular lines

Indicate the formula for the following conditions: p^c(n,r)=