1/3+(-3/5)=
a.-4/8
b.-1/2
c.-14/15
d.-2/2
i need a smart person who is ambitious and up

How do you find the area of a triangle

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?

Choose the more precise measurement. 26.4 cm or 8.39 cm