Since the first wasn't awnsered .
3⁵.3-¹=

729

Step-by-step explanation:

When two terms have the same base (in this case 3) you can just add the exponents so this could become and if you need to simplify, its 3*3*3*3*3*3 or 729

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.

i think it would be 42cm