Help me please

Solve for r in the formula v = ir, when i = 5 and v = 15.

If we review the changes in the landscape surrounding the great salt lake in utah we can see a change in topography. look at the area to the south of the lake. what change has occurred during the last twenty-nine years? a) erosion of the hills b) an increase in marshland c) flooding of the area and the development of wetlands d) deposition of sediments and an increase in elevation

Fossils of glossopteris, an extinct fern, were discovered on which continents to support the theory of continental drift? check all that apply.