That sucks for jack. But uhm what is your question. Also Jack can just put the popcorn in for a longer amount of time
Substitute 21 for x.
y = 21 - 4 = 17
In this question, you have to isolate <em>x</em>.
First, use the distributive property.

Now that you have distributed, subtract the constants.
Answer:
yep it is b
Step-by-step explanation: