11. line n passes through points (7,12) and (4, 15). what is the slope of a line that
is perpendicular to line n?

It is 1.

Step-by-step explanation:

The slope of line n  = rise / run

= (15 - 12) / (4 - 7)

= 3 / -3.

So the slope m = -1.

So the slope of the line perpendicular to n is  -1 /m = -1 / -1  = 1.

i do not know the answer

step-by-step explanation:

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)