Simplify the expression 6h+(-8.1d)-14+5d-2.8h

True or false? a triangle can be circumscribed about a given circle

Of four points are collinear, they are also coplanar

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).