Identify a set of parallel and a set of perpendicular lines in this image. An image shows that line BF intersects both line AD and line EH at 90 degree angles and that line CG intersects both line AD and line EH at 90 degree angles. At the points of intersections, a right angle symbol is shown to indicate that line BF is perpendicular to line AD and to line EH and line CG is perpendicular to line AD and line EH.

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

cosine

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional