Which number is composite (hope i spelled it right)

15

17

19

23

15.

Step-by-step explanation:

15 is composite because 3 * 5 = 15.

The others are prime.

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.

1

step-by-step explanation:

you are throwing one dart