13,15,17 what are the next 4 numbers to it

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

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g