Question

I don’t get this plz help

Answer 1

21 = 3 * 7

48 = 6 * 8 = (2 * 3) * (2 * 2 * 2) = 2^4 * 3

81 = 9 * 9 = (3 * 3) * (3 * 3) = 3^4

56 = 8 * 7 = (2 * 2 * 2) * 7 = 2^3 * 7

63 = 9 * 7 = (3 * 3) * 7 = 3^2 * 7

100 = 10 * 10 = (2 * 5) * (2 * 5) = 2^2 * 5^2

103 = 103

155 = 5 * 31