A pool table that normally costs $700 is on sale for 15% off. If a salesperson makes a 10%
commission on sales, how much would he get for
selling this pool table?
Please help, hurry I’m on a test!!

Given that (x-3) is a factor of f(x)=x^3+ax^2-x-6, find a and hence the number of real roots or the equation f(x)=0

Can someone me and plz do the problem

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?