No, because there are 2.54 centimeters in one inch which means 30cm=11.8111 inches therefore they won't be the same size.
The second. Hope that helps.
Answer:
m = 
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
y = - 4x + 7 is in this form with slope m = - 4
Given a line with slope m then the slope of a line perpendicular to it is
= -
= -
= 
Hence the value of m = 