Please help will mark brainliest +20 pts
Write the expansion of each expression using sigma notation.
(5m-6n)^24

Alake near the arctic circle is covered by a sheet of ice during the cold winter months. when spring arrives, the ice starts to melt. s(t) models the ice sheet's thickness (in meters) as a function of time tt (in weeks). s(t)=-0.25t+4

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Percent increase and decrease. original number: 45 new number: 18