What is the mean absolute deviation of 17, 8, 5, 12, 20, and 12 rounded to the nearest 10th

First find the arithmetic average, which is the "mean".

m=(17+8+5+12+20+12)/6

m=74/6=37/3

Now you sum up the differences between each value and the mean...

mad=(4 2/3+4 1/3+7 1/3+1/3+7 2/3+1/3)

mad=24 2/3

mad=24.7  (to nearest tenth)

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*