Steve's is a contraction of "Steve is". Steve by itself would need the modifier "is" to indicate that it is future tense. Steves' would be a plurilization or to show ownership of someone named "Steves" not Steve.
Actually I got a question just like this it was if 2 zerbles is equal to 5 merbles how many zerbles would 8 perbles be not lieing it might not have been those exactly but the words had no meaning just random lol
4 apples time 7 pencils equals 28, times 4 equals 112 sq ft on the roof. Each pancake is approximately 6 inches in diameter, 112 sq ft times 4 pancakes for every sq foot equals approximately 448 pancakes, give or take a few for the area of the chimney.