Last year Ruben had $10,000 to invest. He invested some of it in an Account that pays 5% simple interest per year and he invested the rest in an account that pays 7% simple interest per year after one year he received a total of $620 in interest how much did he invest in each account? First account:
Second account:

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?