(-31)+1(-30)+(-1)1

evaluate: "(-31)+[(-30)+(-1)]

Evaluate each of the following: (-31)-:[(-30)+(-1)]

Evaluate each of the following : (-31)div[(-30)+(-1)]

-31-:[(-30)+(-1)]

Evaluate each of the following: (-31) div [(-30)+(-1)]

What is the value of (1)/(30.31) +(1)/(31.32)+(1)/(32.33) + …+ (1)/(89.90) ?

If PxxQ={(2,-1),(3,0),(2,1),(3,1),(2,0),(3,-1)} , find P and Q.

Consider a triangle with vertices A(1,2),B(3,1) and C(-3,0) . Find the equation of altitude through vertex A .