Is the relation a function? {(14, 15), (5, 7), (3, 10), (11, 1), (5, 8)}

On a piece of paper graph f(x)=5•(0.4)^x

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?