1-18 odd helpp me plz its due in 30 mins

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Find the values of y: 3y^3(y^2+ 2/3y)=0

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?