Is the gcf of a even number always 2

No. GCF means Greatest Common Factor. So let's say you picked the number 4 and 8..Their GCF is 4 and not 2 despite the fact that they are even numbers.. GCF changes according to the number range.. So you can't always expect it to be 2 for even numbers.. Hope I answered your question.

$3.50p + $1.50d
p = popcorn
d = drinks
$3.50 + ($1.50 x 3)
$3.50 + $4.50
= $8.00

Here's your answer!