In year t, where t is measured in decades, with t = 0 corresponding to 2000 and p(t) is measured in billions. (a) world population is forecast to peak in what year? hint: use the quadratic formula. (remember that t is in decades and not in years. round your answer down to the nearest year.)

Find the value of the cosine for angle a

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 the rational number in lowest terms 99/-15