Question

2 part question

Answer 1

part A is simply asking for the cos

notice how the formula has the dot product on the left side and the magnitudes on the right side, you just need to calculate the appropriate values, plug them in, and solve for cos theta

for part B you will simply take the arccos of the result from part A to find the angle

Answer 2

part A

(-7,8) * (1,0) = (-7,8)

Answer 3

like that right

Answer 4

8*0 = 0 not 8

so the dot product is (-7)(1) + 8(0) = -7

Answer 5

any progress yet? you just need to plug in the magnitudes of the vectors v1 and v2 on the right side then solve for cos(theta)