Your number choies are -10, digital root of 70, 3, digital root of 120, 0, -12 2/3, 1.8, -1* the digital root of 225, 4/3, and pi

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?

Ahighway between points a and b has been closed for repairs. an alternative route between there two locations is to travel between a and c and then from c to b what is the value of y and what is the total distance from a to c to b?

Can someone me with this? i’m not sure what to put for my equations.