Vital systems such as electric power distribution systems have backup components in case one component fails. supposed that two generators each have a probability of 98% of working. the system will continue to work as long as at least one of the generators work what is the probability that the system will continue to operate?

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?