product of powers review

Simplify:

 $\left(6x^2\right)\left(-3x^5\right)$  

•   $18x^7$  

•   $-18x^7$  

•  $3x^7$  

• None of the above

Simplify:

 $2m^4\cdot5m^2$  

•   $10m^6$  

•  $10m^8$  

•   $7m^6$  

• None of the above

Simplify the expression. 
(6x²)(-3x⁵)

• 18x⁷
• -18x⁷
• 18x⁷
• 3x⁷

Simplify the expression.
x⁴ (x¹²)

• x³
• x⁴⁸
• x¹⁶
• x⁸

In order to multiply powers with the same base, we add their exponents. 

• True 
• False