text: exponents......? evaluate the exponential expression.     a) (2^3)^-2 rewrite the expression with positive exponents b) 7/x^-2 c) 3a^-3 d) (2x)^-2*3y^5 a) (2^3)^-2 = 2^(-6) = 1/2^6 =  1 --- 64  rewrite the expression with positive exponents b) 7/x^-2 = 7 / (1/x^2) = 7x^2  c) 3a^-3 = 3 * 1/a^3 =  3 ---- a^3  d) (2x)^-2*3y^5 = 1/(2x)^2 * 3y^5 = 1/(4x^2) * 3y^5 =  3y^5 ------ 4x^2