Help!! Ok give brainlest to the correct

Will give brainliest series to sigma notation write the following series in sigma notation. 6+10+14+18+22+26+30 example image shown below.

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

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).