Aaron is using dimensional analysis to solve the following question: Jungle vine is one of the fastest growing plants. It can grow up to 2.9 feet per day. How fast in inches per hour can jungle vine grow?

2.9 ft /1 day * 12 in/ 1ft * 24h/1 day = 1.45 in/h

Aaron has made a mistake in his work (not his answer). Circle Aaron’s mistake in the image below.

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?