Find A· B
- $a = 10 i + 7 j , \quad b = - 4 i + 3 j$

Multiple Choice

Find a· b.
- $a = 10 i + 7 j , \quad b = - 4 i + 3 j$

A) $\langle - 40,21 \rangle$
B) 61
C) $- 19$
D) $\langle 6,10 \rangle$