A scuba diver starts her dive at an elevation of 90 feet . If her elevation changes by -40 1/2 feet per minute , what will be her elevation after 3 minutes ?

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Each of the four sides of a swimming pool measures 9 meters. the pool is 5 meters deep. how much water will be needed to fill it completely? a. 45 cubic meters b. 81 cubic meters c. 225 cubic meters d. 405 cubic meters reset next

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?