A figure with a perimeter of 24 is enlarged by a scale factor of 2.5. What is the perimeter of the enlarged figure?

When a figure is enlarged by a scale factor $k$, every length, including the perimeter, is multiplied by $k$. So the new perimeter is $24\cdot2.5=60$, choice H. Areas would scale by $k^2$, but perimeter is a length. Choice G ($48$) uses a scale factor of $2$ instead of $2.5$. Choice F ($26.5$) adds $2.5$ instead of multiplying. Choice J ($150$) multiplies by $2.5^2=6.25$, which is the factor for area. Check that the enlarged perimeter is larger than the original, by a factor of $2.5$.