Resolver con su debido procedimiento 1. Sumar -7x-4y+6z ; 10x-20y-8z ; -5x+24y+2z
2. Sumar 2a +3b, 5c-4, 8a +6, +7c-9​

The table shows the number of students who signed up for different after school activities. activity students cooking 9 chess 4 photography 8 robotics 11 select the true statements about the information in the table.

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test

A+b= 17, ab=70, find the value of |a-b|