Answer:
A and B
Step-by-step explanation:
The surface area is found by calculating the 6 faces of a 3-d object. Since A and B are the only ones that cause you to use the whole object for the given task the answers are A and B.
The answer is 5/2
y2-y1/x2-x1
9-4/7-5 = 5/2
It is 3 because you would have to multiply the squares and also divide
So you’re trying to get the a on it’s own while you use +-x/ operations.
For this one you divide both sides by 2 to get the a alone.
2a/2=12/2
a=6