On a coordinate plane, a triangle with side length of 5 has points (negative 4, 1), (0, 4), (4, 1). A triangle with a side length of x has points (negative 2, negative 1), (0, negative 2), (2, negative 1). The smaller triangle is the image of the bigger triangle after a sequence of transformations. What is the value of x?

x =
units

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

Find the slope of the line y =8/9x + 1.

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?