What is flatter as an abstract noun?

What is 81 plus 63? What are two lines in two different planes that do not intersect called? What is two fifths divided by seven tenths? Is 144 a n odd or even number? How mant times can 9 go into 432? What multiplies to -308 and adds to 17? What times 13 equals 78? How do you compute one sigma deviation? What times what equals 16? How manty times does 2 go into 127? Is 9.6 larger then 9.06? Is 0.205 bigger than 0.5? Which three-dimensional figure has 6 faces 8 verticles and 12 edges? What Expressions that use a letter to represent and unknown quantity? What is next in the sequence 1 4 27 256 3125? How do you multiply numerators and denominators by the same number? What is the least common multiple of 504 and 273? What does the number 360 mean? How much would 85 lbs of gold be worth? How many different ways can you make change for a half dollar without using pennies?