What are the roots of the equation x^2-4x+13=0?

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

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

Which of the following circles have their centers in the third quadrant?