Out of 30 questions adam answered 12 inncorectly. what percent of the questions did he answer correctly

60% percent is the answer.

D

Step-by-step explanation:

To find the inner product of two vectors (a,b) and (c,d) you would use the equation (a * c) + (b * d)

So for (-8,2) and (4.5,18) the inner product would be

(-8 * 4.5) + (2 * 18)

= 0

The vectors are only perpendicular when the inner product is equal to 0. Since it is equal to 0 in this case, the vectors are perpendicular.

D - 0; yes