Write out the sum using the summation notation, assuming the suggested pattern continues. -10-2+6+14++110

4+6x-3x^3 in standard form with explanations because i don’t understand

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

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?