Adolphin calf swims at a depth of -9/5 feet below surface. an adult dolphin swims at a depth of 7/4 times the depth at which the calf swims. what is the depth , in feet, of the adult dolphin from the sea surface? pls i really need : )

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.

Which set of lengths could represent the sides of a triangle? a. 3, 7, 10 b. 4, 5, 10 c. 6, 8, 14 d. 12, 6, 7