B. The volunteers look at the pictures of the city and rate how beautiful they find the pictures on a scale of 1 to 10. They then read the article and look at the pictures again, rating
them on the same scale.
Survey

Observational Study

Experimental Study

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

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?

In δabc, m∠acb = 90°, cd ⊥ ab and m∠acd = 45°. find: a find cd, if bc = 3 in