Which ordered pair comes from the table? х
у
1
2
2
4.
3
3
4
2
O A. (4, 2)
O B. (3, 1)
O C. (2, 3)
O D. (2, 1)

What is a rational number between 9.5 and 9.7

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

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?