Which expression has the same value as the one below? 21 + (-23)
O A. 21 - 23
OB. 44
C. 21
O D. 21 + 23

Adding and subtracting matricesfind the value of each variable. x = and y = would

Drag the tiles to the boxes to form correct pairs. not all tiles will be used. match each set of vertices with the type of quadrilateral they form.

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?