4. Answer each question. Show your reasoning. (Show work)
a.
20% of a is 11. What is a?
b.
75% of bis 12. What is b?
14
I
c.
80% of c is 20. What is c?
d.
200% of d is 18. What is d?

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

What is the value of y? round to the nearest tenth

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?