If the point (x, –1) is on the unit circle, what is the value of x?

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 order to be invited to tutoring or extension activities a students performance 20 point higher or lower than average for the

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25