Find the volume of the given solid. Bounded by the cylinder x2 + y2 = 16 and the planes y = 4z, x = 0, z = 0 in the first octant

Can someone me and do the problem plz so i can understand it more better

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'