Step-by-step explanation:

Answer:
3x+12
Step-by-step explanation:
3(x+4)
Use the distributive property to multiply 3 by x+4.
3x+12
Step-by-step explanation:
= 4x-x+5x+1+8-2
=8x+7
proved##
Answer:
<h2>The Yangtze River</h2>
<em>Hope that helps! :)</em>
<em></em>
<em>-Aphrodite</em>
Step-by-step explanation:
Answer: 33 televisions in 1 hour
Step-by-step explanation:
99/3=33