A farmer planted 1890 plants in a field in rows each having 63 plants. A certain type of worm destroyed 21 plants in each row. How many plants were not destroyed by the worms?​

Show me how you find the value of each variable and determine what the value of each variable is you i appreciate it : )

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?

Solve the formula ax+ by = c for x.