Help, no links An industrial water tank in the shape of a triangular pyramid has a height of 30 feet. The area of the base of the water tank is 400 square feet. What is the volume of the water tank in cubic feet?

A. 4,000 cubic feet
B. 12,000 cubic feet
C. 36,000 cubic feet
D. 6,000 cubic feet

Lines b and c are parallel. what is the measure of 2? m2 = 31° m2 = 50° m2 = 120° m2 = 130°

Ascientist places 24 cells in a petri dish. she knows the cells grow at an exponential rate, doubling in number every hour. how long will it take (in hours) for there to be 1100 cells in the dish? time to 1100 cells: 5.51832530 hours how long will it take to reach 110 cells? time to 110 cells : 2.1963972 hours what is the average rate of change in the number of cells between 9 hours and 11 hours? average rate of change: cells per hour what is the instantaneous rate of change after 7 hours? instantaneous rate of change: cells per hour note: you can earn partial credit on this problem.

Through which points should a line of rotation be placed to create a cylinder with a radius of 3 units