Please help, this makes no sense to me.

Answer:
Step-by-step explanation:
Keep in mind
-the fractions have to be EQUAL if they are equivalent fractions
-we multiply the numerator and denominator by the SAME number
-when comparing fractions think (how many slices / the size of the slice ) = (15 slices / size 20) is more than (12 slices / size 20)
Answer:
[tex]\textsf{left} \ \ \dfrac{3 \times 5}{4 \times 5}=\dfrac{15}{20}\\\\\\\ \textsf{right} \ \ \dfrac{3 \times 4}{5 \times 4}=\dfrac{12}{20}\\\\\\\dfrac{15}{20}>\dfrac{12}{20} \ ,\textsf{so} \ \dfrac34>\dfrac35[/tex]