a. 23^10
B.15^100= 3^20
C. 3107^1000
D. 3^9 = 1^3
E. 31^99
f. 113-1^99 = 112^99
G. 2107-1^999 = 2106^999 = 702^333 = 234^111 = 78^37
i. 123-12^900 = 111^900 = 37^300
j. 172-1^9900 = 171^9900 = 57^3300 = 19^1100
k. 12108-12^9990 = 12096^9990 = 4032^3330 = 1344^1110 = 448^370
l. 2735-273^900 = 2662^900