Someone help me, I think my account got wiped. All my questions answered, likes, points, everything gone. Had this app for like two days and I've answered everything truthfully. Can someone help?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days