20. The principal of a high school read a study that reported a positive correlation between the number of calculators owned by high school students and their math achievement. Based on
this study, he decides to buy each student at his school 2 calculators, hoping to improve their
math achievement. Explain the flaw in the principal's reasoning.

What is a possible solutions of the x> 3?

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?

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)