The population of california is approximately 38,040,000. the population of texas is about 2.606 × 107. what is the approximate total population of these two states?

a)40.646 × 107

b)40.646 × 106

c)6.410 × 107

d)6.410 × 1014

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?