which expressions are equivalent? choose all that apply
7 x 7 x 7
7 to the fourth power
4 to the seventh power
7^4
28
7 x 7 x 7, 7 to the fourth power, 7^4
evaluate the expression 81 - 8^2
81 - 8^2 = ?
7 x 7 x 7
7 to the fourth power
4 to the seventh power
7^4
28
81 - 8^2 = ?