Consider the vectors A = 15.5i − 39.4j and B = −2.15i + 2.65j − 4.05k. Find

R = B − A in component form.

R= i(-2.15-15.5)+j(2.65+39.4)+k(-4.05)

combined the numbers in each direction, and you have it.
(-17.65,42.05,-4.05)