What are the coordinates of the intercepts

Which statement best describes a square? a. a special rectangle that has four right angles b. a special trapezoid that has four sides of equal length c. a special rectangle that has four sides of equal length d. a special trapezoid that has four right angles

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

Plz hurry evaluate the expression a+b where a=8 and b=19