In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6991 subjects randomly selected from an online group involved with ears. There were 1335 surveys returned.
Use a 0.01 significance level to test the claim that the return rate is less than 20%. Use the P-value method and use the normal distribution as an approximation to the binomial distribution.

What properties allow transformation to be used as a problem solving tool

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?

Which of the following is the graph of y= square root -x-3