Simplify. 4(7d+9)

A. 28d + 36

B. 28d + 9

C. 11d + 13

D. 11d + 9

Asphere has a diameter of 10 in. what is the volume of the sphere?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

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?