Multiplication of Powers: Variable in the exponent of the power

Reduce the following equation :

$9^{2a}\times9^{2x}\times9^a=$

$9^{3a+2x}$

Reduce the following equation:

$6^a\times6^{4a}=$

B+C are correct

Reduce the following equation

$6^x\times6^a\times6^b=$

$6^{x+a+b}$

Reduce the following equation:

$7^{x+a}\times7^a\times7^x=$

$7^{2x+2a}$

Reduce the following equation:

$8^{3x}\times8^{3y}\times8^{2y+x}=$

$8^{4x+5y}$

Reduce the following equation:

$8^{-3x}\times8^{-3y}\times8^{2y+x}=$

$8^{-2x-y}$

Reduce the following equation:

$a^{-3}\times a^5\times a^{-4}=$

All answers are correct