During a sale, every item in a store is 80% of its regular price. 1.If the regular price of a T-shirt is$10, what is its sale price? 2.The regular prices of five items are shown here. Find the sale price of each item

Find the value of x for which abcd must be a parallelogram -9-6x x-30

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

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?