1. 9^3*9^4=9^(3+4)=9^7;
2. 15^1*15^2=15^(1+2)=15^3;
3. 74^3*74^2=74^(3+2)=74^5;
4. A^7*A^2=A^(7+2)=A^9.
1. 9^3*9^4=9^(3+4)=9^7;
2. 15^1*15^2=15^(1+2)=15^3;
3. 74^3*74^2=74^(3+2)=74^5;
4. A^7*A^2=A^(7+2)=A^9.