My cousin sent me this and even i dont understand..

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

Which expression is equivalent to 16 in exponential form? a) 4 × 4 b) 8 × 2 c) 23 d) 24

The two box p digram the two box plots show the data of the pitches thrown by two pitchers throughout the season. which statement is correct? check all that apply. pitcher 1 has a symmetric data set. pitcher 1 does not have a symmetric data set. pitcher 2 has a symmetric data set. pitcher 2 does not have a symmetric data set. pitcher 2 has the greater variation.ots represent the total number of touchdowns two quarterbacks threw in 10 seasons of play