Final answer:
Marjani grew 12 inches between the ages of 11 and 12.
Step-by-step explanation:
To find out how much Marjani grew, we need to subtract her height when she turned 11 from her height when she turned 12.
To subtract mixed numbers, we need to find a common denominator first. The common denominator of 4 and 4 is 4. So, we have 59(3)/(4) - 61(1)/(4) = 59(12)/(4) - 61(1)/(4). Subtract the whole numbers and then subtract the fractions: 59(12)/(4) - 61(1)/(4) = 48/4 = 12 inches.
Therefore, Marjani grew 12 inches between the ages of 11 and 12.