Final answer:
To determine who ate more pizza, Erica's and Jenny's fractions are converted to improper fractions and decimal form, revealing that Jenny ate more pizza than Erica.
Step-by-step explanation:
The student asks who ate more pizza, Erica or Jenny, with Erica eating 1 3/4 slices and Jenny eating 1 9/11 slices. To determine who ate more, we need to compare these two fractions. The fraction 1 3/4 can be converted to an improper fraction by multiplying the whole number by the denominator, adding the numerator, and then writing the result over the original denominator which gives us 7/4. Similarly, 1 9/11 can be converted to 20/11. Now we can compare the improper fractions: 7/4 is equivalent to 1.75 and 20/11 is approximately 1.818.... Since 1.818... is greater than 1.75, Jenny ate more pizza than Erica.