It takes 20 minutes for 5 people to paint 5 walls.
How many minutes does it take 9 people to paint 9 walls?

Is the open sentence 5x-2=3x+2 true when x=2? justify your answer.

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?

What expression is equivalent to log3(x+4)