Can someone please help me out with these ... 1) 2+5
2) 9x-7x
3)16m+3m+10+5-3
4)-2x+5+4x-11

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?

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m