Answer:
c. -1; no
Step-by-step explanation:
The inner product of 2 vector (a,b) and (c,d) is:
(a,b)(c,d) = a*c + b*d
If the inner product is equal to 0, the vectors are perpendicular.
So, the inner product of (5,2) and (-3,7) is equal to:
(5, 2)×(-3, 7) = 5(-3) + 2(7) = -1
The inner product is -1, it is different to 0, so the vectors are not perpendicular.
