Determine the perimeter of the athletic track

Subtract 8 1/6 - 4 5/6 . simplify the answer and write as a mixed number.

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b