A dolphin was swimming 6 feet below sea level. The number line shows the location of the dolphin. It then swam up 4 feet. Describe how to use the
number line to find the new location of the dolphin.

Please help and hurry ASAP

Find the volume of the solid generated when the region bounded by y= x and y= 4√x is revolved about the x-axis the volume of the solid is: (type an exact answer cubic units)

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?