Express the relationship between x + 2 and -2x + 8 as a single equation

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

The graph below shows the height of a projectile t seconds after it is launched. if acceleration due to gravity is -16 ft/s2, which equation models the height of the projectile correctly?

Which of the following describes the symmetry of the graph of y = x3?