Answer:
A. (U+V)^2 or (U-V)^2
Step-by-step explanation:
21 is greater cause it whole number
to get any fraction of a number, as long as the numerator is 1 in the fraction, just divide by the denominator. In this case it's 4. Since you can't place .75 of a puzzle piece, she's placed 100 pieces in the puzzle.