I’m not sure how to answer this question but I worked like to know why I got it wrong. My school is doing online stuff now so to corona virus

Formula for area of a circle is A = PI x r^2

Area of outside circle = 3.14 x 5^2 = 3.14 x 25 = 78.5

Area of inner circle = 3.14 x 2.5^2 = 3.14 x 6.25 = 19.625

Area of shaded region = outside circle - inner circle = 78.5 - 19.625 = 58.875 = 59 m

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.

a. positive: 2 or 0; negative : 2 or 0; complex: 4or2or0