Tanya is training a turtle for a turtle race. for every of an hour that the turtle is crawling, he can travel of a mile. at what unit rate is the turtle crawling?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3

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?